气候变化领域集成服务门户(CCPortal): Sensitivity of grassland carbon pools to plant diversity, elevated CO2, and soil nitrogen addition over 19 years

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DOI	10.1073/pnas.2016965118
	Sensitivity of grassland carbon pools to plant diversity, elevated CO2, and soil nitrogen addition over 19 years
	Pastore M.A.; Hobbie S.E.; Reich P.B.
发表日期	2021
ISSN	00278424
卷号	118 期号:17
英文摘要	Whether the terrestrial biosphere will continue to act as a net carbon (C) sink in the face of multiple global changes is questionable. A key uncertainty is whether increases in plant C fixation under elevated carbon dioxide (CO2) will translate into decades-long C storage and whether this depends on other concurrently changing factors. We investigated how manipulations of CO2, soil nitrogen (N) supply, and plant species richness influenced total ecosystem (plant + soil to 60 cm) C storage over 19 y in a free-air CO2 enrichment grassland experiment (BioCON) in Minnesota. On average, after 19 y of treatments, increasing species richness from 1 to 4, 9, or 16 enhanced total ecosystem C storage by 22 to 32%, whereas N addition of 4 g N m−2 · y−1 and elevated CO2 of +180 ppm had only modest effects (increasing C stores by less than 5%). While all treatments increased net primary productivity, only increasing species richness enhanced net primary productivity sufficiently to more than offset enhanced C losses and substantially increase ecosystem C pools. Effects of the three global change treatments were generally additive, and we did not observe any interactions between CO2 and N. Overall, our results call into question whether elevated CO2 will increase the soil C sink in grassland ecosystems, helping to slow climate change, and suggest that losses of biodiversity may influence C storage as much as or more than increasing CO2 or high rates of N deposition in perennial grassland systems. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Biodiversity; Carbon; Elevated CO2; Grassland; Nitrogen
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/179743
作者单位	Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN 55108, United States; Department of Forest Resources, University of Minnesota, St. Paul, MN 55108, United States; Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW 2753, Australia
推荐引用方式 GB/T 7714	Pastore M.A.,Hobbie S.E.,Reich P.B.. Sensitivity of grassland carbon pools to plant diversity, elevated CO2, and soil nitrogen addition over 19 years[J],2021,118(17).
APA	Pastore M.A.,Hobbie S.E.,&Reich P.B..(2021).Sensitivity of grassland carbon pools to plant diversity, elevated CO2, and soil nitrogen addition over 19 years.Proceedings of the National Academy of Sciences of the United States of America,118(17).
MLA	Pastore M.A.,et al."Sensitivity of grassland carbon pools to plant diversity, elevated CO2, and soil nitrogen addition over 19 years".Proceedings of the National Academy of Sciences of the United States of America 118.17(2021).