Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.2002780117 |
Stimulation of soil respiration by elevated CO2 is enhanced under nitrogen limitation in a decade-long grassland study | |
Qun Gao; Gangsheng Wang; Kai Xue; Yunfeng Yang; Jianping Xie; Hao Yu; Shijie Bai; Feifei Liu; Zhili He; Daliang Ning; Sarah E. Hobbie; Peter B. Reich; Jizhong Zhou | |
2020-12-14 | |
发表期刊 | Proceedings of the National Academy of Sciences |
出版年 | 2020 |
英文摘要 | Whether and how CO2 and nitrogen (N) availability interact to influence carbon (C) cycling processes such as soil respiration remains a question of considerable uncertainty in projecting future C–climate feedbacks, which are strongly influenced by multiple global change drivers, including elevated atmospheric CO2 concentrations (eCO2) and increased N deposition. However, because decades of research on the responses of ecosystems to eCO2 and N enrichment have been done largely independently, their interactive effects on soil respiratory CO2 efflux remain unresolved. Here, we show that in a multifactor free-air CO2 enrichment experiment, BioCON (Biodiversity, CO2, and N deposition) in Minnesota, the positive response of soil respiration to eCO2 gradually strengthened at ambient (low) N supply but not enriched (high) N supply for the 12-y experimental period from 1998 to 2009. In contrast to earlier years, eCO2 stimulated soil respiration twice as much at low than at high N supply from 2006 to 2009. In parallel, microbial C degradation genes were significantly boosted by eCO2 at low but not high N supply. Incorporating those functional genes into a coupled C–N ecosystem model reduced model parameter uncertainty and improved the projections of the effects of different CO2 and N levels on soil respiration. If our observed results generalize to other ecosystems, they imply widely positive effects of eCO2 on soil respiration even in infertile systems. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/308319 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Qun Gao,Gangsheng Wang,Kai Xue,et al. Stimulation of soil respiration by elevated CO2 is enhanced under nitrogen limitation in a decade-long grassland study[J]. Proceedings of the National Academy of Sciences,2020. |
APA | Qun Gao.,Gangsheng Wang.,Kai Xue.,Yunfeng Yang.,Jianping Xie.,...&Jizhong Zhou.(2020).Stimulation of soil respiration by elevated CO2 is enhanced under nitrogen limitation in a decade-long grassland study.Proceedings of the National Academy of Sciences. |
MLA | Qun Gao,et al."Stimulation of soil respiration by elevated CO2 is enhanced under nitrogen limitation in a decade-long grassland study".Proceedings of the National Academy of Sciences (2020). |
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