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The Effect of Tree Species Composition on Soil C and N Pools and Greenhouse Gas Fluxes in a Mediterranean Reforestation
Journal of Soil Science and Plant Nutrition ( IF 3.9 ) Pub Date : 2021-02-18 , DOI: 10.1007/s42729-021-00444-w
Gianluigi Mazza , Alessandro E. Agnelli , Alessandra Lagomarsino

The shift of tree species composition from conifers to mixed stands as a silvicultural management option for substituting pure plantations can have consequences for the greenhouse gas (GHG) budgets and climate impact. In this context, the main objective of the study was to assess the effect of tree species composition on GHG fluxes, organic matter of forest floor and soil in a degraded conifers plantation in Central Italy. Field-chamber GHG fluxes, litter, and total concentrations of soil C and N, soil temperature, and soil moisture were analyzed, assessing their relationships, under mixed and pure conifer species composition during three monitoring years. Carbon and nitrogen contents were higher under mixed than pure conifer species composition, both in forest floor and mineral soil. Soil carbon dioxide under litter of mixed tree species was significantly higher than that of pure conifers (+17.5%). Methane uptake was higher in the mixed plots than in the pure ones (+12.4%), especially in summer and autumn. Nitrous oxide fluxes were characterized by very low emissions, higher under mixed tree-species than pure conifers during winter. The relevant role of seasonality was confirmed by including in the linear mixed-effects model (LMM) the seasons as an additional random effect that produced a significant interaction between the soil moisture and soil temperature, especially on soil carbon dioxide and methane fluxes. Overall, the GHG budget was driven by organic matter availability, higher under mixed species. Our findings are a first step to help the understanding of the role of tree species composition on GHG emissions in the Mediterranean forest ecosystems.



中文翻译:

树种组成对地中海改造森林土壤碳氮储量和温室气体通量的影响

作为替代纯人工林的造林管理选择,树木种类组成从针叶树转变为混交林可能会对温室气体(GHG)预算和气候影响产生影响。在这种情况下,该研究的主要目的是评估意大利中部退化的针叶树人工林中树木种类组成对温室气体通量,森林地面有机物质和土壤的影响。在三个监测年内,在混合和纯针叶树种组成下,分析了田间温室气体通量,凋落物以及土壤碳和氮的总浓度,土壤温度和土壤湿度,并评估了它们之间的关系。在林地和矿质土壤中,混合条件下的碳和氮含量均高于纯针叶树种。混合树种凋落物下的土壤二氧化碳含量明显高于纯针叶树(+ 17.5%)。混合地块的甲烷吸收量高于纯地块(+ 12.4%),尤其是在夏季和秋季。一氧化二氮通量的特征是排放极低,在混合树种下冬季比纯针叶树更高。季节性的相关作用已通过在线性混合效应模型(LMM)中纳入季节作为额外的随机效应得到了证实,该随机效应在土壤水分和土壤温度之间产生了显着的相互作用,尤其是对土壤二氧化碳和甲烷通量。总体而言,温室气体预算是由有机物的可获得性驱动的,在混合物种中更高。

更新日期:2021-02-19
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