当前位置: X-MOL 学术J. Geophys. Res. Biogeosci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Limited Influence of Nutrient Additions to the Transformation of Dissolved and Particulate Organic Matter From a Peatland Headwater
Journal of Geophysical Research: Biogeosciences ( IF 3.7 ) Pub Date : 2021-07-05 , DOI: 10.1029/2021jg006331
C. S. Moody 1, 2 , F. Worrall 1
Affiliation  

Peatlands are typically rich in labile dissolved and particulate organic matter (DOM and POM) but poor in nutrients; as these peatland waters flow through a catchment they mix with more nutrient-rich but organic matter (OM) poor waters. These new sources of nutrients may lead to increased OM degradation, driving further release of CO2 to the atmosphere. The aim of this study was to discover if the addition of nutrients changed the rates of peat-derived dissolved and particulate organic carbon (DOC and POC) degradation, or if the additional nutrients were incorporated into the OM structure. The DOM and POM extracted from a peatland stream was characterised at the beginning of the experiment, and after 70-h and 10-days, from water with and without additional nutrients. Results showed adding nutrients to the water had no significant impact on the rate of degradation of DOC or POC over a 10 day period. There were significant differences in the N content and C:N ratios, as well as other composition variables, of the DOM in the treatments with additional nutrients showing that N was incorporated into the DOM structure, but that nutrient addition did not stimulate significant extra DOM or DOC loss. The N content of POM was not impacted, and isotope analysis, supported the conclusion that DOM turnover was occurring even if there was no net change in DOC concentration due to nutrient addition.

中文翻译:

添加营养物质对泥炭地源头溶解和颗粒状有机物转化的影响有限

泥炭地通常富含不稳定的溶解有机物和颗粒有机物(DOM 和 POM),但营养成分贫乏;当这些泥炭地水域流经集水区时,它们会与营养丰富但有机质 (OM) 较差的水域混合。这些新的营养来源可能会导致 OM 降解增加,从而进一步释放 CO 2到气氛。本研究的目的是发现添加营养物质是否会改变泥炭衍生的溶解和颗粒有机碳(DOC 和 POC)降解的速率,或者是否将额外的营养物质纳入 OM 结构。从泥炭地流中提取的 DOM 和 POM 在实验开始时以及 70 小时和 10 天后,从添加和不添加额外营养物的水中进行表征。结果表明,在 10 天内向水中添加营养物质对 DOC 或 POC 的降解速率没有显着影响。在添加营养元素的处理中,DOM 的 N 含量和 C:N 比以及其他组成变量存在显着差异,表明 N 已掺入到 DOM 结构中,但这种营养添加并没有引起显着的额外 DOM 或 DOC 损失。POM 的 N 含量没有受到影响,同位素分析支持这样的结论,即即使 DOC 浓度没有因添加养分而发生净变化,DOM 也会发生转换。
更新日期:2021-07-28
down
wechat
bug