气候变化领域集成服务门户(CCPortal): Unexpected reversal of C3 versus C4 grass response to elevated CO2 during a 20-year field experiment

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DOI	10.1126/science.aas9313
	Unexpected reversal of C3 versus C4 grass response to elevated CO2 during a 20-year field experiment
	Reich P.B.; Hobbie S.E.; Lee T.D.; Pastore M.A.
发表日期	2018
ISSN	0036-8075
起始页码	317
结束页码	320
卷号	360 期号:6386
英文摘要	Theory predicts and evidence shows that plant species that use the C4 photosynthetic pathway (C4 species) are less responsive to elevated carbon dioxide (eCO2) than species that use only the C3 pathway (C3 species). We document a reversal from this expected C3-C4 contrast. Over the first 12 years of a 20-year free-air CO2 enrichment experiment with 88 C3 or C4 grassland plots, we found that biomass was markedly enhanced at eCO2 relative to ambient CO2 in C3 but not C4 plots, as expected. During the subsequent 8 years, the pattern reversed: Biomass was markedly enhanced at eCO2 relative to ambient CO2 in C4 but not C3 plots. Soil net nitrogen mineralization rates, an index of soil nitrogen supply, exhibited a similar shift: eCO2 first enhanced but later depressed rates in C3 plots, with the opposite true in C4 plots, partially explaining the reversal of the eCO2 biomass response. These findings challenge the current C3-C4 eCO2 paradigm and show that even the best-supported short-term drivers of plant response to global change might not predict long-term results. © 2017 The Authors, some rights reserved.
英文关键词	carbon dioxide; nitrogen; carbon dioxide; biomass; C3 plant; C4 plant; carbon dioxide; field method; global change; grass; grassland; soil nitrogen; ambient air; Article; biomass; C3 plant; C4 plant; field experiment; grass; nitrogen availability; nitrogen mineralization; nonhuman; nutrient supply; plant response; priority journal; soil property; carbon cycle; climate change; metabolism; nitrogen fixation; photosynthesis; Poaceae; Biomass; Carbon Cycle; Carbon Dioxide; Climate Change; Nitrogen Fixation; Photosynthesis; Poaceae
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/245200
作者单位	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; Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN 55108, United States; Department of Biology, University of Wisconsin, Eau Claire, WI 54701, United States
推荐引用方式 GB/T 7714	Reich P.B.,Hobbie S.E.,Lee T.D.,et al. Unexpected reversal of C3 versus C4 grass response to elevated CO2 during a 20-year field experiment[J],2018,360(6386).
APA	Reich P.B.,Hobbie S.E.,Lee T.D.,&Pastore M.A..(2018).Unexpected reversal of C3 versus C4 grass response to elevated CO2 during a 20-year field experiment.Science,360(6386).
MLA	Reich P.B.,et al."Unexpected reversal of C3 versus C4 grass response to elevated CO2 during a 20-year field experiment".Science 360.6386(2018).