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Streamflow variability controls N and P export and speciation from Alaskan coastal temperate rainforest watersheds Biogeochemistry (IF 4.161) Pub Date : 2021-01-16 Jason B. Fellman, Eran Hood, David V. D’Amore, Richard T. Edwards
The perhumid coastal temperate rainforest (PCTR) of northwestern North America is projected to become warmer and wetter in coming decades, with largely unquantified implications for the magnitude and speciation of riverine nitrogen (N) and phosphorus (P) export from PCTR ecosystems. We collected streamwater at weekly to monthly intervals for a year and intensively during two multi-day storms (one each
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A “toy” model of biogeochemical dynamics on climate gradients Biogeochemistry (IF 4.161) Pub Date : 2021-01-08 Peter M. Vitousek, Jesse Bloom Bateman, Oliver A. Chadwick
We used a simple “toy” model to aid in the evaluation of the controls of biogeochemical patterns along a climate gradient. The model includes simplified treatments of water balance (precipitation minus Potential Evapotranspiration), leaching, weathering of cation- and P-bearing minerals, N cycling and loss, biomass production, and biological N fixation. We use δ15N as a central integrator of biogeochemical
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Beyond total carbon: conversion of amazon forest to pasture alters indicators of soil C cycling Biogeochemistry (IF 4.161) Pub Date : 2021-01-08 Ademir Durrer, Andrew J. Margenot, Lucas C. R. Silva, Brendan J. M. Bohannan, Klaus Nusslein, Joost van Haren, Fernando D. Andreote, Sanjai J. Parikh, Jorge L. Mazza Rodrigues
It is well established that land use change (LUC) can impact soil organic carbon (SOC) in tropical regions, but the long-term effects of LUC on soil quality and C cycling remain unclear. Here, we evaluated how LUC affects soil C cycling in the Amazon region using a 100-year observational chronosequence spanning primary forest-to-pasture conversion and subsequent secondary forest succession. We found
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The influence of tillage and fertilizer on the flux and source of nitrous oxide with reference to atmospheric variation using laser spectroscopy Biogeochemistry (IF 4.161) Pub Date : 2021-01-04 Peggy H. Ostrom, Samuel DeCamp, Hasand Gandhi, Joshua Haslun, Nathaniel E. Ostrom
Nitrous oxide (N2O) is the third most important long-lived greenhouse gas and agriculture is the largest source of N2O emissions. Curbing N2O emissions requires understanding influences on the flux and sources of N2O. We measured flux and evaluated microbial sources of N2O using site preference (SP; the intramolecular distribution of 15N in N2O) in flux chambers from a grassland tilling and agricultural
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Nitrogen biogeochemistry of water-agro-food systems: the example of the Seine land-to-sea continuum Biogeochemistry (IF 4.161) Pub Date : 2021-01-04 Gilles Billen, Josette Garnier
As an illustration of the usefulness of the concept of water-agro-food systems, this paper describes the mechanisms behind the nitrogen cascade from agricultural soils to the coastal sea rivers through aquifers, riparian wetlands, rivers and streams and the estuary, for the case study of the Seine river watershed and its receiving coastal sea. It is stressed that the structure of the agro-food system
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Availability of soil base cations and micronutrients along soil profile after 13-year nitrogen and water addition in a semi-arid grassland Biogeochemistry (IF 4.161) Pub Date : 2021-01-04 Guoxiang Niu, Ruzhen Wang, Muqier Hasi, Yinliu Wang, Qianqian Geng, Changhui Wang, Yong Jiang, Jianhui Huang
Alteration in the availability of soil base cations and micronutrients is critical to maintain stable ecosystem functioning under the predicted global change scenarios. However, changes in these soil cations and their relationships with soil physiochemical properties along soil profile remain unclear under the combined increasing N deposition and precipitation changes. In this study, the concentrations
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Quantifying the frequency of synchronous carbon and nitrogen export to the river network Biogeochemistry (IF 4.161) Pub Date : 2021-01-03 Adam S. Wymore, Hannah M. Fazekas, William H. McDowell
The biogeochemical cycles of carbon (C) and nitrogen (N) are inextricably linked for a range of reactions. For coupled reactions such as denitrification to occur, however, solutes must be found together in space and time. Using the framework of concentration-discharge (c-Q) relationships, we examine the frequency of synchronous C and N export (i.e. identical c-Q behavior) across a river network using > 5 years
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Influence of fire retardant and pyrogenic carbon on microscale changes in soil nitrogen and phosphorus Biogeochemistry (IF 4.161) Pub Date : 2021-01-03 Si Gao, Thomas H. DeLuca
During wildfire season in the western US, fire retardant chemicals are dropped from aircraft in an effort to control the spread of fire. Fire retardant dropped on sites that are not actively burning results in exceptionally high soil nitrogen (N) and phosphorus (P) “fertilization” effect on wildland soils impacting terrestrial and aquatic ecosystems. Herein, we used microdialysis to evaluate the short-term
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Dissolved organic matter in large lakes: a key but understudied component of the carbon cycle Biogeochemistry (IF 4.161) Pub Date : 2021-01-03 Elizabeth C. Minor, Alan R. Oyler
The world’s largest five freshwater lakes include tropical meromictic, temperate weakly stratified, and temperate holomictic lakes ranging in age from twenty-five million to ~ 10,000 years old. They contain > 50% of Earth’s surface liquid freshwater and 15% of Earth’s lake-water dissolved organic carbon. Large lakes, however, are understudied in terms of carbon cycling, including the roles of dissolved
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A landscape approach to nitrogen cycling in urban lawns reveals the interaction between topography and human behaviors Biogeochemistry (IF 4.161) Pub Date : 2021-01-03 Amanda K. Suchy, Peter M. Groffman, Lawrence E. Band, Jonathan M. Duncan, Arthur J. Gold, J. Morgan Grove, Dexter H. Locke, Laura Templeton
Lawns are a common ecosystem type in human-dominated landscapes which can have negative impacts on water quality due to fertilizer applications, but also host a range of ecosystem services. While many studies have addressed water and nitrogen (N) dynamics in lawns, few have considered how topography interacts with human behaviors to control these dynamics. Our overarching objective was to determine
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Patterns and drivers of multi-annual CO 2 emissions within a temperate suburban neighborhood Biogeochemistry (IF 4.161) Pub Date : 2021-01-03 Andrew C. Hill, Josep Barba, John Hom, Rodrigo Vargas
Over the last 100 years a shifting human population has seen large proportions of people relocating from rural agricultural regions to urban and suburban areas. Extensive development within these modified lands has altered soils and natural vegetative cover which directly affects many biophysical processes. The current study examines over 4 years of continuous (i.e., hourly) CO2 measurements within
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Exchanges of major elements in a deciduous forest canopy Biogeochemistry (IF 4.161) Pub Date : 2021-01-02 Marie-Pierre Turpault, Gil Kirchen, Christophe Calvaruso, Paul-Olivier Redon, Marie Dincher
Forest canopy is a complex interface between the atmosphere, the biosphere and the lithosphere, exerting a strong influence on forest durability through element recycling. Leaves are filters of the low atmosphere and can capture dry deposition (DD). Trees have developed strategies, such as resorption (R) during senescence, for nutrient conservation. These strategies seem to depend on the soil type
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Correction to: Determining ecosystem functioning in Brazilian biomes through foliar carbon and nitrogen concentrations and stable isotope ratios Biogeochemistry (IF 4.161) Pub Date : 2020-12-30 L. A. Martinelli, G. B. Nardoto, A. Soltangheisi, C. R. G. Reis, A. L. Abdalla-Filho, P. B. Camargo, T. F. Domingues, D. Faria, A. M. Figueira, T. F. Gomes, S. R. M. Lins, S. F. Mardegan, E. Mariano, R. C. Miatto, R. Moraes, M. Z. Moreira, R. S. Oliveira, J. P. H. B. Ometto, F. L. S. Santos, J. Sena-Souza, D. M. L. Silva, J. C. S. S. Silva, S. A. Vieira
The initial online publication contained typesetting mistakes in the author information. The original article has been corrected.
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The fate of calcium in temperate forest soils: a Ca K-edge XANES study Biogeochemistry (IF 4.161) Pub Date : 2020-12-30 Jörg Prietzel, Wantana Klysubun, Luis Carlos Colocho Hurtarte
Calcium (Ca) plays a crucial role for plant nutrition, soil aggregation, and soil organic matter (SOM) stabilization. Turnover and ecological functions of Ca in soils depend on soil Ca speciation. For the first time, we used synchrotron-based X-ray absorption near-edge structure (XANES) spectroscopy at the Ca K-edge (4038 eV) to investigate Ca speciation in soils. We present Ca K-edge XANES spectra
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Altered litter inputs modify carbon and nitrogen storage in soil organic matter in a lowland tropical forest Biogeochemistry (IF 4.161) Pub Date : 2020-12-23 Emma J. Sayer, Catherine Baxendale, Ali J. Birkett, Laëtitia M. Bréchet, Biancolini Castro, Deirdre Kerdraon-Byrne, Luis Lopez-Sangil, Chadtip Rodtassana
Soil organic matter (SOM) in tropical forests is an important store of carbon (C) and nutrients. Although SOM storage could be affected by global changes via altered plant productivity, we know relatively little about SOM stabilisation and turnover in tropical forests compared to temperate systems. Here, we investigated changes in soil C and N within particle size fractions representing particulate
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Correction to: How will a drier climate change carbon sequestration in soils of the deciduous forests of Central Europe? Biogeochemistry (IF 4.161) Pub Date : 2020-12-18 István Fekete, Imre Berki, Kate Lajtha, Susan Trumbore, Ornella Francioso, Paola Gioacchini, Daniela Montecchio, Gábor Várbíró, Áron Béni, Marianna Makádi, Ibolya Demeter, Balázs Madarász, Katalin Juhos, Zsolt Kotroczó
The initial online publication contained a typesetting mistake in the author information. The original article has been corrected.
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Volcanic CO 2 seep geochemistry and use in understanding ocean acidification Biogeochemistry (IF 4.161) Pub Date : 2020-12-09 A. Aiuppa, J. M. Hall-Spencer, M. Milazzo, G. Turco, S. Caliro, R. Di Napoli
Ocean acidification is one of the most dramatic effects of the massive atmospheric release of anthropogenic carbon dioxide (CO2) that has occurred since the Industrial Revolution, although its effects on marine ecosystems are not well understood. Submarine volcanic hydrothermal fields have geochemical conditions that provide opportunities to characterise the effects of elevated levels of seawater CO2
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The evolution of biogeochemistry: revisited Biogeochemistry (IF 4.161) Pub Date : 2020-11-26 Thomas S. Bianchi
The evolution of biogeochemistry, retraces the important historical steps in part, covered by Gorham (Biogeochemistry 13:199–239, 1991) in the 18–19th centuries—with new emergent linkages and trends in 20–21st centuries. In the post-phlogiston period, key synthetic connections are made between weathering, atmospheric chemistry, carbon cycling, and climate change. Early work in the 19th century, focused
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Geochemical focusing and sequestration of manganese during eutrophication of Lake Stechlin (NE Germany) Biogeochemistry (IF 4.161) Pub Date : 2020-11-24 Grzegorz Scholtysik, Olaf Dellwig, Patricia Roeser, Helge Wolfgang Arz, Peter Casper, Christiane Herzog, Tobias Goldhammer, Michael Hupfer
Significant sedimentation of manganese (Mn) in form of manganese oxides (MnOx) and the subsequent formation of authigenic calcium-rich rhodochrosite (Mn(Ca)CO3) were observed in the seasonally stratified hard water Lake Stechlin in north-eastern Germany. This manganese enrichment was assumed to be associated with recent eutrophication of the formerly oligotrophic lake. The mechanisms and processes
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Correction to: Background nitrogen deposition controls the effects of experimental nitrogen addition on soil gross N transformations in forest ecosystems Biogeochemistry (IF 4.161) Pub Date : 2020-11-23 Yi Cheng, Jing Wang, Zhiwei Ge, Jinbo Zhang, Yanjiang Cai, Scott X. Chang, Zucong Cai, Han Y. H. Chen
In the initial online publication the figure legends for Figures 1 and 2 were reversed. The original article has been corrected.
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Divergent controls on carbon concentration and persistence between forests and grasslands of the conterminous US Biogeochemistry (IF 4.161) Pub Date : 2020-11-23 K. A. Heckman, L. E. Nave, M. Bowman, A. Gallo, J. A. Hatten, L. M. Matosziuk, A. R. Possinger, M. SanClements, B. D. Strahm, T. L. Weiglein, C. Rasmussen, C. W. Swanston
Variation in soil organic C (%OC) concentration has been associated with the concentration of reactive Fe- and Al-oxyhydroxide phases and exchangeable Ca, with the relative importance of these two stabilizing components shifting as soil pH moves from acid to alkaline. However, it is currently unknown if this pattern is similar or different with regard to measures of soil C persistence. We sampled soils
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How will a drier climate change carbon sequestration in soils of the deciduous forests of Central Europe? Biogeochemistry (IF 4.161) Pub Date : 2020-11-19 István Fekete, Imre Berki, Kate Lajtha, Susan Trumbore, Ornella Francioso, Paola Gioacchini, Daniela Montecchio, Gábor Várbíró, Áron Béni, Marianna Makádi, Ibolya Demeter, Balázs Madarász, Katalin Juhos, Zsolt Kotroczó
Global warming is accompanied by increasing water stress across much of our planet. We studied soil biological processes and changes in soil organic carbon (SOC) storage in 30 Hungarian oak forest sites in the Carpathian Basin along a climatic gradient (mean annual temperature (MAT) 9.6–12.1 °C, mean annual precipitation (MAP) 545–725 mm) but on similar gently sloped hillsides where the parent materials
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Environmental control on carbon exchange of natural and planted forests in Western Himalayan foothills of India Biogeochemistry (IF 4.161) Pub Date : 2020-11-18 Taibanganba Watham, Ritika Srinet, Subrata Nandy, Hitendra Padalia, Sanjiv K. Sinha, N. R. Patel, Prakash Chauhan
India has committed to increase carbon sequestration by forests under the Nationally Determined Contributions (NDC). However, the CO2 carbon exchange characteristics (Gross Primary Productivity, Net Ecosystem Exchange, and Ecosystem respiration) of Indian forests are poorly understood. Immense carbon sequestration opportunities exist with the natural as well as planted forests. Therefore, it becomes
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Assessing microbial residues in soil as a potential carbon sink and moderator of carbon use efficiency Biogeochemistry (IF 4.161) Pub Date : 2020-11-17 Kevin Geyer, Jörg Schnecker, A. Stuart Grandy, Andreas Richter, Serita Frey
A longstanding assumption of glucose tracing experiments is that all glucose is microbially utilized during short incubations of ≤2 days to become microbial biomass or carbon dioxide. Carbon use efficiency (CUE) estimates have consequently ignored the formation of residues (non-living microbial products) although such materials could represent an important sink of glucose that is prone to stabilization
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Carbon and nitrogen accumulation rates in ombrotrophic peatlands of central and northern Alberta, Canada, during the last millennium Biogeochemistry (IF 4.161) Pub Date : 2020-11-17 Simon van Bellen, William Shotyk, Gabriel Magnan, Lauren Davies, Ted Nason, Gillian Mullan-Boudreau, Michelle Garneau, Tommy Noernberg, Luca Bragazza, Claudio Zaccone
Northern peatlands sequester carbon (C) and nitrogen (N) over millennia, at variable rates that depend on climate, environmental variables and anthropogenic activity. The ombrotrophic peatlands of central and northern Alberta (Canada) have developed under variable climate conditions during the last hundreds to thousands of years, while in the course of the twentieth century, some regions were also
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The linkage of 13 C and 15 N soil depth gradients with C:N and O:C stoichiometry reveals tree species effects on organic matter turnover in soil Biogeochemistry (IF 4.161) Pub Date : 2020-11-12 Marcel Lorenz, Delphine Derrien, Bernd Zeller, Thomas Udelhoven, Willy Werner, Sören Thiele-Bruhn
The knowledge of tree species dependent turnover of soil organic matter (SOM) is limited, yet required to understand the carbon sequestration function of forest soil. We combined investigations of 13C and 15N and its relationship to elemental stoichiometry along soil depth gradients in 35-year old monocultural stands of Douglas fir (Pseudotsuga menziesii), black pine (Pinus nigra), European beech (Fagus
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Soil C, N and P cycling enzyme responses to nutrient limitation under elevated CO 2 Biogeochemistry (IF 4.161) Pub Date : 2020-11-10 J. Ben Keane, Marcel R. Hoosbeek, Christopher R. Taylor, Franco Miglietta, Gareth K. Phoenix, Iain P. Hartley
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Tree stem methane emissions from subtropical lowland forest ( Melaleuca quinquenervia ) regulated by local and seasonal hydrology Biogeochemistry (IF 4.161) Pub Date : 2020-11-09 Luke C. Jeffrey, Damien T. Maher, Douglas R. Tait, Sebastian Euler, Scott G. Johnston
Tree stem mediated methane emissions represent a potentially important yet poorly constrained source of atmospheric methane. Here we present the first ever quantification of tree stem methane emissions from Melaleuca quinquenervia, a widespread iconic Australian lowland tree and globally invasive species. Under two distinct hydrological conditions (wet and dry) we captured 431 tree stem flux measurements
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Sensitivity of soil organic matter to climate and fire in a desert grassland Biogeochemistry (IF 4.161) Pub Date : 2020-11-09 Enqing Hou, Jennifer A. Rudgers, Scott L. Collins, Marcy E. Litvak, Carleton S. White, Douglas I. Moore, Yiqi Luo
Drylands contain a third of the organic carbon stored in global soils; however, the long-term dynamics of soil organic carbon in drylands remain poorly understood relative to dynamics of the vegetation carbon pool. We examined long-term patterns in soil organic matter (SOM) against both climate and prescribed fire in a Chihuahuan Desert grassland in central New Mexico, USA. SOM concentration was estimated
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Background nitrogen deposition controls the effects of experimental nitrogen addition on soil gross N transformations in forest ecosystems Biogeochemistry (IF 4.161) Pub Date : 2020-11-05 Yi Cheng, Jing Wang, Zhiwei Ge, Jinbo Zhang, Yanjiang Cai, Scott X. Chang, Zucong Cai, Han Y. H. Chen
Nitrogen (N) deposition can profoundly alter soil N transformation processes and the long-term productivity of forest ecosystems. The response of soil gross N transformations to N deposition in forest ecosystems has been well studied through simulated N addition experiments. Simulated N addition experiments are conducted under a wide range of background N deposition rates. However, it remains unclear
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Soil greenhouse gas fluxes following conventional selective and reduced-impact logging in a Congo Basin rainforest Biogeochemistry (IF 4.161) Pub Date : 2020-11-03 Rodine Tchiofo Lontsi, Marife D. Corre, Najeeb A. Iddris, Edzo Veldkamp
Selective logging is among the main causes of tropical forest degradation, but little is known about its effects on greenhouse gas (GHG) fluxes from highly weathered Ferralsol soils in Africa. We measured soil CO2, N2O, and CH4 fluxes, and their soil controlling factors at two forests that had undergone conventional selective logging and reduced-impact logging in Cameroon. Each logging system had four
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Contrasting stream nitrate and sulfate response to recovery from experimental watershed acidification Biogeochemistry (IF 4.161) Pub Date : 2020-11-03 Kaizad F. Patel, Ivan J. Fernandez, Sarah J. Nelson, Jacob Malcomb, Stephen A. Norton
Improvements in air quality have led to ecosystem recovery from acidic deposition, but the mechanisms and trajectories of this recovery are not fully understood. Here, we present long-term stream response and recovery data for paired watersheds at the Bear Brook Watershed in Maine (BBWM) during declining ambient SO4 and NO3 in precipitation. East Bear (EB) received ambient deposition from 1989 to 2018;
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Determining ecosystem functioning in Brazilian biomes through foliar carbon and nitrogen concentrations and stable isotope ratios Biogeochemistry (IF 4.161) Pub Date : 2020-11-03 L. A. Martinelli, G. B. Nardoto, A. Soltangheisi, G. R. G. Reis, A. L. Abdalla-Filho, P. B. Camargo, T. F. Domingues, D. Faria, A. M. Figueira, T. F. Gomes, S. R. M. Lins, S. F. Mardegan, E. Mariano, R. C. Miatto, R. Moraes, M. Z. Moreira, R. S. Oliveira, J. P. H. B. Ometto, F. L. S. Santos, J. Sena-Souza, D. M. L. Silva, J. C. S. S. Silva, A. S. Vieira
By analyzing 6,480 tree leaf samples from 57 sites within Brazilian biomes, we considered whether vegetation types in terrestrial ecosystems reflect biogeochemical diversity and whether they fit into a leaf economics spectrum (LES). To achieve this, we investigated the relations among leaf carbon (C) and nitrogen (N) concentrations, their isotope natural abundance and C:N ratio. In addition, we tested
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Changes in hydrology affects stream nutrient uptake and primary production in a high-Arctic stream Biogeochemistry (IF 4.161) Pub Date : 2020-11-02 Louis J. Skovsholt, Ada Pastor, Catherine L. Docherty, Alexander M. Milner, Tenna Riis
Global change is predicted to have a marked impact on freshwater ecosystems in the High Arctic, including temperature increase, enhanced precipitation, permafrost degradation and increased vegetation cover. These changes in river catchments can alter flow regime, solute transport to streams and substantially affect stream ecosystem functioning. The objective of this study was to evaluate changes in
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Effects of elevated temperature on microbial breakdown of seagrass leaf and tea litter biomass Biogeochemistry (IF 4.161) Pub Date : 2020-10-31 Stacey M. Trevathan-Tackett, Kasper E. Brodersen, Peter I. Macreadie
Seagrass ecosystems are globally-significant ‘blue carbon’ sinks; however, there is concern that this capacity will decline if rising ocean temperatures accelerate microbial decomposition. Decomposition of plant litter is a key process in the global carbon cycle—it influences how much carbon is available for sequestration. Therefore, understanding the biogeochemistry underlying decomposition is essential
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Growing season soil warming may counteract trend of nitrogen oligotrophication in a northern hardwood forest Biogeochemistry (IF 4.161) Pub Date : 2020-10-30 Jamie L. Harrison, Kyle Schultz, Megan Blagden, Rebecca Sanders-DeMott, Pamela H. Templer
Over the next century, many mid and high latitude temperate ecosystems are projected to experience rising growing season temperatures and increased frequency of soil freeze/thaw cycles (FTCs) due to a reduction in the depth and duration of the winter snowpack. We conducted a manipulative field experiment in a northern hardwood forest at the Hubbard Brook Experimental Forest in New Hampshire to determine
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The effects of temperature on soil phosphorus availability and phosphatase enzyme activities: a cross-ecosystem study from the tropics to the Arctic Biogeochemistry (IF 4.161) Pub Date : 2020-10-28 Alanna N. Shaw, Cory C. Cleveland
Earth system models predict large increases in global terrestrial net primary productivity (NPP) over the next century, largely reflecting positive effects of climate change and increasing atmospheric carbon dioxide concentrations on plant growth. However, while theory predicts that soil phosphorus (P) availability may keep pace with P demand as the climate warms, we lack experimental evidence to support
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Functional identity and functional diversity co-regulate litter mixture decomposition and nitrogen release in boreal riparian forest ponds Biogeochemistry (IF 4.161) Pub Date : 2020-10-28 Xin-Hou Zhang, Lei Wang, Wei Jiang, Rong Mao
The relationship between biodiversity and litter decomposition has received considerable attention, but the complex biodiversity effects on decomposition and the underlying mechanisms are still unclear, especially in boreal riparian forest ponds. Here, we collected leaf litter from an N2-fixing species (Alnus sibirica) and two non-N2-fixing species (Betula platyphylla and Betula fruticosa) in a boreal
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Hydrodynamic impacts on tidal-scale dissolved inorganic nitrogen cycling and export across the estuarine turbidity maxima to coast Biogeochemistry (IF 4.161) Pub Date : 2020-10-27 Dan Yu, Nengwang Chen, Peng Cheng, Fengling Yu, Huasheng Hong
Estuarine turbidity maxima (ETM) is a transition zone subject to the influence of river flow and tides. Here we showed the distinct impacts of fluvial and tidal hydrodynamics on dissolved inorganic nitrogen (DIN) cycling and export across the ETM to coast. We conducted tidal-scale hourly measurements at the ETM zone of the Jiulong River Estuary in Southeast China in May and December 2015. Generally
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Can coral skeletal-bound nitrogen isotopes be used as a proxy for past bleaching? Biogeochemistry (IF 4.161) Pub Date : 2020-10-19 Dirk V. Erler, María Salomé Rangel, Alejandro Tagliafico, Jessica Riekenberg, Hanieh Tohidi Farid, Les Christidis, Sander R. Scheffers, Janice M. Lough
There is currently no reliable geochemical proxy of historical coral bleaching. Here we test the hypothesis that increases in the nitrogen isotopic signature of coral tissue, which is recorded in skeletal-bound organic material (CS-δ15N), can be used to detect coral bleaching events in the past. We measured CS-δ15N in coral colonies that showed high density thermal stress bands associated with the
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The biotic contribution to the benthic stream sediment phosphorus buffer Biogeochemistry (IF 4.161) Pub Date : 2020-10-17 Z. P. Simpson, R. W. McDowell, L. M. Condron
Benthic stream sediments interact strongly with phosphorus (P) and can buffer dissolved reactive P (DRP) concentrations. The sediment P buffer can be measured with the sediment equilibrium phosphate concentration at net zero sorption (EPC0), which often correlates well with DRP. Yet, it is unclear how much of this P affinity in sediments is attributable to biotic (microbial P demand) or abiotic (sorption)
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Origin and fate of dissolved organic matter in four shallow Baltic Sea estuaries Biogeochemistry (IF 4.161) Pub Date : 2020-10-15 Maren Voss, Eero Asmala, Ines Bartl, Jacob Carstensen, Daniel J. Conley, Joachim W. Dippner, Christoph Humborg, Kaarina Lukkari, Jolita Petkuviene, Heather Reader, Colin Stedmon, Irma Vybernaite-Lubiene, Nicola Wannicke, Mindaugas Zilius
Coastal waters have strong gradients in dissolved organic matter (DOM) quantity and characteristics, originating from terrestrial inputs and autochthonous production. Enclosed seas with high freshwater input therefore experience high DOM concentrations and gradients from freshwater sources to more saline waters. The brackish Baltic Sea experiences such salinity gradients from east to west and from
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Microsites and early litter decomposition patterns in the soil and forest canopy at regional scale Biogeochemistry (IF 4.161) Pub Date : 2020-10-13 Yonatan Aguilar-Cruz, José G. García-Franco, Gerhard Zotz
Plant litter decomposition is a key ecological process that is mostly studied at the forest floor. However, decomposition generally starts in the canopy. In this study, we evaluated the effect of litter composition and climate on the initial phase of decomposition in the soil and two contrasting types of canopy microsites along an elevational gradient (0–2200 m a.s.l.). To this end, we incubated standard
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Limited effect of drainage on peat properties, porewater chemistry, and peat decomposition proxies in a boreal peatland Biogeochemistry (IF 4.161) Pub Date : 2020-10-12 Lorna I. Harris, Tim R. Moore, Nigel T. Roulet, Andrew J. Pinsonneault
The aim of this study was to determine the effect of drainage on peat properties, porewater chemistry, and peat decomposition proxies in an ombrogenous peatland in the Hudson Bay Lowland (HBL). We anticipated that drainage would change peatland hydrology, vegetation, and biogeochemistry, leading to an increase in peat decomposition. As indicators of peat biogeochemical change and potential proxies
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Some thoughts on the biogeochemical cycling of potassium in terrestrial ecosystems Biogeochemistry (IF 4.161) Pub Date : 2020-10-08 William H. Schlesinger
Potassium presents a conundrum for biogeochemists. Potassium is cycled wastefully at the plant level, but it appears to be conserved in the nutrient budgets of entire ecosystems, where it sometimes limits net primary productivity. An increasing demand for K fertilizer may accompany the expansion of agriculture into highly weathered tropical soils, where limited supplies of K may control the distribution
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Biogeochemical cycling of phosphorus in subsoils of temperate forest ecosystems Biogeochemistry (IF 4.161) Pub Date : 2020-10-01 Andrei Rodionov, Sara L. Bauke, Christian von Sperber, Carmen Hoeschen, Ellen Kandeler, Jens Kruse, Hans Lewandowski, Sven Marhan, Carsten W. Mueller, Margaux Simon, Federica Tamburini, David Uhlig, Friedhelm von Blanckenburg, Friederike Lang, Wulf Amelung
Tree roots penetrate the soil to several meters depth, but the role of subsoils for the supply of nutrient elements such as phosphorus (P) to the trees is poorly understood. Here, we tested the hypothesis that increased P deficiency in the topsoil results in an increased microbial recycling of P from the forest subsoil. We sampled soils from four German temperate forest sites representing a gradient
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Particles in humus leaching solution influence the input–output budget of the major elements in a beech forest Biogeochemistry (IF 4.161) Pub Date : 2020-09-29 Marie Dincher, Christophe Calvaruso, Marie-Pierre Turpault
As forest ecosystems generally develop on poor and unfertilized soils, nutrient cycles and input/output budgets, notably in the humus compartment, are key to determining forest sustainability. Previous studies generally focused on the ecosystem scale or only on C, N, P in the humus layer. Our objectives in this study are to establish these budgets for principal elements, considering dust inputs and
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Bark decomposition in white oak soil outperforms eastern hemlock soil, while bark type leads to consistent changes in soil microbial composition Biogeochemistry (IF 4.161) Pub Date : 2020-09-18 Rondy J. Malik, Ryan V. Trexler, David M. Eissenstat, Terrence H. Bell
Bark decomposition is an underexamined component of soil carbon cycling and soil community assembly. Numerous studies have shown faster decomposition of leaf litter in “home” environments (i.e. within soil adjacent to the plant that produced the leaves), suggesting potential legacy effects from previous deposition of similar litter. This is expected to occur through, in part, accumulation of microorganisms
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Nitrogen dynamics after two years of elevated CO 2 in phosphorus limited Eucalyptus woodland Biogeochemistry (IF 4.161) Pub Date : 2020-09-10 Louise C. Andresen, Yolima Carrillo, Catriona A. Macdonald, Laura Castañeda-Gómez, Samuel Bodé, Tobias Rütting
It is uncertain how the predicted further rise of atmospheric carbon dioxide (CO2) concentration will affect plant nutrient availability in the future through indirect effects on the gross rates of nitrogen (N) mineralization (production of ammonium) and depolymerization (production of free amino acids) in soil. The response of soil nutrient availability to increasing atmospheric CO2 is particularly
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Carbon budgets for soil and plants respond to long-term warming in an Alaskan boreal forest Biogeochemistry (IF 4.161) Pub Date : 2020-08-14 Charlotte J. Alster, Steven D. Allison, Kathleen K. Treseder
The potential consequences of global warming for ecosystem carbon stocks are a major concern, particularly in high-latitude regions where soil carbon pools are especially large. Research on soil and plant carbon responses to warming are often based on short-term (< 10 year) warming experiments. Furthermore, carbon budgets from boreal forests, which contain at least 10–20% of the global soil carbon
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Seasonality is more important than forest type in regulating the pool size and composition of soil soluble N in temperate forests Biogeochemistry (IF 4.161) Pub Date : 2020-08-13 Lei Gao, Paul W. Hill, Davey L. Jones, Yafen Guo, Fei Gao, Xiaoyang Cui
Soil soluble nitrogen (N) is crucial to the N nutrition and productivity of plants. Consequently, understanding the factors that affect its pool size and composition is of considerable importance. Here, six typical forest types in northeast China were investigated to determine the dynamics of soil soluble N across seasons and plant communities, and the potential drivers. Soil free amino acids, NH4+
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Recent increases of rainfall and flooding from tropical cyclones (TCs) in North Carolina (USA): implications for organic matter and nutrient cycling in coastal watersheds Biogeochemistry (IF 4.161) Pub Date : 2020-08-11 Hans W. Paerl, Nathan S. Hall, Alexandria G. Hounshell, Karen L. Rossignol, Malcolm A. Barnard, Richard A. Luettich, Jacob C. Rudolph, Christopher L. Osburn, Jerad Bales, Lawrence W. Harding
Coastal North Carolina experienced 36 tropical cyclones (TCs), including three floods of historical significance in the past two decades (Hurricanes Floyd-1999, Matthew-2016 and Florence-2018). These events caused catastrophic flooding and major alterations of water quality, fisheries habitat and ecological conditions of the Albemarle-Pamlico Sound (APS), the second largest estuarine complex in the
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Plant invasion alters the Michaelis–Menten kinetics of microbial extracellular enzymes and soil organic matter chemistry along soil depth Biogeochemistry (IF 4.161) Pub Date : 2020-08-11 Kyungjin Min, Vidya Suseela
Microbial extracellular enzymes decompose distinct components of soil organic matter (SOM), thus influencing its stability. However, we lack the knowledge about how the kinetics of individual enzymes vary when multiple substrates change simultaneously. Here we used Japanese knotweed (Polygonum cuspidatum) invasion as a model system to explore how the Michaelis–Menten kinetics (Vmax and km) of microbial
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Immobilization of agricultural phosphorus in temperate floodplain soils of Illinois, USA Biogeochemistry (IF 4.161) Pub Date : 2020-08-10 Mary R. Arenberg, Xinqiang Liang, Yuji Arai
Nutrient losses from Mississippi watersheds degrade downstream water bodies. As forested floodplains intercept agricultural drainage waters, a limiting nutrient like phosphorus (P) could potentially be sequestered in forest soils, reducing P loss to the Gulf of Mexico. Thus far, the role of temperate deciduous floodplain soils for P has not been extensively investigated in the Midwestern United States
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From hogs to HABs: impacts of industrial farming in the US on nitrogen and phosphorus and greenhouse gas pollution. Biogeochemistry (IF 4.161) Pub Date : 2020-08-10 Patricia M Glibert
Nutrient pollution and greenhouse gas emissions related to crop agriculture and confined animal feeding operations (CAFOs) in the US have changed substantially in recent years, in amounts and forms. This review is intended to provide a broad view of how nutrient inputs—from fertilizer and CAFOs—as well as atmospheric NH3 and greenhouse gas emissions, are changing regionally within the US and how these
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Interannual changes in δ 15 N baseline in a lake–swamp–river food web: effects of summer precipitation in West Siberian forest steppe Biogeochemistry (IF 4.161) Pub Date : 2020-08-09 Gen Kanaya, Natalia I. Yurlova, Elena N. Yadrenkina, Jun-ichi Okano, Shuichi Shikano
Frequency and intensity of precipitation events can alter hydrological conditions of lotic systems and material inflow from the catchment. In this study, interannual changes in food web structure were investigated in a lake–swamp–river system in the semi-arid West Siberian forest-steppe region using carbon and nitrogen stable isotope ratios (δ13C and δ15N). The δ15N signatures of aquatic producers
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Nitrate reduction pathways and interactions with iron in the drainage water infiltration zone of a riparian wetland soil Biogeochemistry (IF 4.161) Pub Date : 2020-08-09 Rasmus Jes Petersen, Zhi Liang, Christian Prinds, Arnaud Jéglot, Bo Thamdrup, Charlotte Kjaergaard, Lars Elsgaard
Eutrophication of natural water bodies is moderated by transformation of nitrate (NO3−) in riparian wetlands, which serve as filters of infiltrating drain water from upland agricultural areas. The present study comprised field observations, laboratory experiments and metagenomic studies to describe NO3− removing transformation pathways and interactions with the cycling of iron (Fe) in a temperate riparian
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Vulnerability of soil organic matter to microbial decomposition as a consequence of burning Biogeochemistry (IF 4.161) Pub Date : 2020-07-29 Gerald P. Dicen, Roland V. Rallos, John Leonard R. Labides, Ian A. Navarrete
Ecosystem fires are stochastic and anthropogenic phenomena that affect critical soil processes. Nevertheless, environmental managers, policy-makers, and even scientists have often overlooked the induced transformations that fire does to soil organic matter (SOM), which sustains an ecosystem’s overall health. Here, we investigated the effects of simulated fire conditions on bulk SOM, water-extractable
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Spatial and seasonal variability of sedimentary features and nitrogen benthic metabolism in a tropical coastal area (Taganga Bay, Colombia Caribbean) impacted by a sewage outfall Biogeochemistry (IF 4.161) Pub Date : 2020-07-27 Diana M. Arroyave Gómez, Darío Gallego Suárez, Marco Bartoli, Mauricio Toro-Botero
The effects of anthropogenic pressures in coastal areas are extensively studied in temperate but not in tropical zones, where their impact might be amplified by high water temperatures and upwelling phenomena. Sedimentary features and benthic metabolism were studied during the non upwelling (NUPW) and upwelling (UPW) seasons in Taganga Bay (Colombia). The bay is impacted by a submarine outfall of virtually
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Mercury and selenium loading in mountaintop mining impacted alkaline streams and riparian food webs Biogeochemistry (IF 4.161) Pub Date : 2020-07-21 Jacqueline R. Gerson, Laura C. Naslund, Yu-Ting Liu, Heileen Hsu-Kim, Charles T. Driscoll, Matthew R. V. Ross, Matthew N. Waters, Emily S. Bernhardt
Coal is naturally enriched in trace elements, including mercury (Hg) and selenium (Se). Alkaline mine drainage from mountaintop mining valley fill (MTM-VF)—the dominant form of surface coal mining in Appalachia, USA—releases large quantities of Se into streams draining mined catchments, resulting in elevated bioaccumulation of Se in aquatic and riparian organisms. Yet, the release of Hg into these
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