气候变化领域集成服务门户(CCPortal): Nitrogen deposition accelerates soil carbon sequestration in tropical forests

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DOI	10.1073/pnas.2020790118
	Nitrogen deposition accelerates soil carbon sequestration in tropical forests
	Lu X.; Vitousek P.M.; Mao Q.; Gilliam F.S.; Luo Y.; Turner B.L.; Zhou G.; Mo J.
发表日期	2021
ISSN	00278424
卷号	118 期号:16
英文摘要	Terrestrial ecosystem carbon (C) sequestration plays an important role in ameliorating global climate change. While tropical forests exert a disproportionately large influence on global C cycling, there remains an open question on changes in below-ground soil C stocks with global increases in nitrogen (N) deposition, because N supply often does not constrain the growth of tropical forests. We quantified soil C sequestration through more than a decade of continuous N addition experiment in an N-rich primary tropical forest. Results showed that long-term N additions increased soil C stocks by 7 to 21%, mainly arising from decreased C output fluxes and physical protection mechanisms without changes in the chemical composition of organic matter. A meta-analysis further verified that soil C sequestration induced by excess N inputs is a general phenomenon in tropical forests. Notably, soil N sequestration can keep pace with soil C, based on consistent C/N ratios under N additions. These findings provide empirical evidence that below-ground C sequestration can be stimulated in mature tropical forests under excess N deposition, which has important implications for predicting future terrestrial sinks for both elevated anthropogenic CO2 and N deposition. We further developed a conceptual model hypothesis depicting how soil C sequestration happens under chronic N deposition in N-limited and N-rich ecosystems, suggesting a direction to incorporate N deposition and N cycling into terrestrial C cycle models to improve the predictability on C sink strength as enhanced N deposition spreads from temperate into tropical systems. © This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY).
英文关键词	Atmospheric nitrogen deposition; Below-ground carbon sequestration; Global changes; Nitrogen biogeochemistry; Soil carbon storage
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179852
作者单位	Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China; Center of Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Guangzhou, 510650, China; Department of Biology, Stanford University, Stanford, CA 94305, United States; Department of Biology, University of West Florida, Pensacola, FL 32514, United States; Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, AZ 86011, United States; Smithsonian Tropical Research Institute, Apartado, Balboa, Ancon, 0843-03092, Panama
推荐引用方式 GB/T 7714	Lu X.,Vitousek P.M.,Mao Q.,et al. Nitrogen deposition accelerates soil carbon sequestration in tropical forests[J],2021,118(16).
APA	Lu X..,Vitousek P.M..,Mao Q..,Gilliam F.S..,Luo Y..,...&Mo J..(2021).Nitrogen deposition accelerates soil carbon sequestration in tropical forests.Proceedings of the National Academy of Sciences of the United States of America,118(16).
MLA	Lu X.,et al."Nitrogen deposition accelerates soil carbon sequestration in tropical forests".Proceedings of the National Academy of Sciences of the United States of America 118.16(2021).