globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1922030117
论文题名:
Resolving the dust bowl paradox of grassland responses to extreme drought
作者: Knapp A.K.; Chen A.; Griffin-Nolan R.J.; Baur L.E.; Carroll C.J.W.; Gray J.E.; Hoffman A.M.; Li X.; Post A.K.; Slette I.J.; Collins S.L.; Luo Y.; Smith M.D.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:36
起始页码: 22249
结束页码: 22255
语种: 英语
英文关键词: Climate change ; Extreme drought ; Photosynthetic pathway ; Precipitation seasonality
Scopus关键词: air temperature ; article ; biomass ; climate change ; drought ; grassland ; high temperature ; Kansas ; latitude ; nonhuman ; phenology ; photosynthesis ; plant water use ; Poaceae ; precipitation ; seasonal variation ; Wyoming ; climate change ; history ; metabolism ; physiological stress ; physiology ; season ; soil ; temperature ; United States ; carbon ; rain ; water ; Carbon ; Climate Change ; Droughts ; Grassland ; History, 20th Century ; Poaceae ; Rain ; Seasons ; Soil ; Stress, Physiological ; Temperature ; United States ; Water
英文摘要: During the 1930s Dust Bowl drought in the central United States, species with the C3photosynthetic pathway expanded throughout C4-dominated grasslands. This widespread increase in C3grasses during a decade of low rainfall and high temperatures is inconsistent with well-known traits of C3vs. C4pathways. Indeed, water use efficiency is generally lower, and photosynthesis is more sensitive to high temperatures in C3than C4species, consistent with the predominant distribution of C3grasslands in cooler environments and at higher latitudes globally. We experimentally imposed extreme drought for 4 y in mixed C3/C4grasslands in Kansas and Wyoming and, similar to Dust Bowl observations, also documented three- to fivefold increases in C3/C4biomass ratios. To explain these paradoxical responses, we first analyzed long-term climate records to show that under nominal conditions in the central United States, C4grasses dominate where precipitation and air temperature are strongly related (warmest months are wettest months). In contrast, C3grasses flourish where precipitation inputs are less strongly coupled to warm temperatures. We then show that during extreme drought years, precipitation-temperature relationships weaken, and the proportion of precipitation falling during cooler months increases. This shift in precipitation seasonality provides a mechanism for C3grasses to respond positively to multiyear drought, resolving the Dust Bowl paradox. Grasslands are globally important biomes and increasingly vulnerable to direct effects of climate extremes. Our findings highlight how extreme drought can indirectly alter precipitation seasonality and shift ecosystem phenology, affecting function in ways not predictable from key traits of C3and C4species. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164046
Appears in Collections:气候变化与战略

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作者单位: Knapp, A.K., Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, United States; Chen, A., Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, United States; Griffin-Nolan, R.J., Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, United States; Baur, L.E., Department of Biology, University of New Mexico, Albuquerque, NM 87131, United States; Carroll, C.J.W., Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, United States; Gray, J.E., Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, United States; Hoffman, A.M., Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, United States; Li, X., Key Laboratory for Geographical Process Analysis and Simulation of Hubei Province, Central China Normal University, Wuhan, Hubei, 430079, China, College of Urban and Environmental Sciences, Central China Normal University, Wuhan, Hubei, 430079, China; Post, A.K., Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, United States; Slette, I.J., Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, United States; Collins, S.L., Department of Biology, University of New Mexico, Albuquerque, NM 87131, United States; Luo, Y., Center for Ecosystem Science and Society, Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011, United States; Smith, M.D., Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, United States

Recommended Citation:
Knapp A.K.,Chen A.,Griffin-Nolan R.J.,et al. Resolving the dust bowl paradox of grassland responses to extreme drought[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(36)
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