气候变化领域集成服务门户(CCPortal): Peatland warming strongly increases fine-root growth

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DOI	10.1073/pnas.2003361117
	Peatland warming strongly increases fine-root growth
	Malhotra A.; Brice D.J.; Childs J.; Graham J.D.; Hobbie E.A.; Vander Stel H.; Feron S.C.; Hanson P.J.; Iversen C.M.
发表日期	2020
ISSN	0027-8424
起始页码	17627
结束页码	17634
卷号	117 期号:30
英文摘要	Belowground climate change responses remain a key unknown in the Earth system. Plant fine-root response is especially important to understand because fine roots respond quickly to environmental change, are responsible for nutrient and water uptake, and influence carbon cycling. However, fine-root responses to climate change are poorly constrained, especially in northern peatlands, which contain up to two-thirds of the world’s soil carbon. We present fine-root responses to warming between +2 °C and 9 °C above ambient conditions in a whole-ecosystem peatland experiment. Warming strongly increased fine-root growth by over an order of magnitude in the warmest treatment, with stronger responses in shrubs than in trees or graminoids. In the first year of treatment, the control (+0 °C) shrub fine-root growth of 0.9 km m-2 y-1 increased linearly by 1.2 km m-2 y-1 (130%) for every degree increase in soil temperature. An extended belowground growing season accounted for 20% of this dramatic increase. In the second growing season of treatment, the shrub warming response rate increased to 2.54 km m-2 °C-1. Soil moisture was negatively correlated with fine-root growth, highlighting that drying of these typically water-saturated ecosystems can fuel a surprising burst in shrub belowground productivity, one possible mechanism explaining the “shrubification” of northern peatlands in response to global change. This previously unrecognized mechanism sheds light on how peatland fine-root response to warming and drying could be strong and rapid, with consequences for the belowground growing season duration, microtopography, vegetation composition, and ultimately, carbon function of these globally relevant carbon sinks. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Belowground plant response; Elevated carbon dioxide; Experimental warming; Fine roots; Peatland
语种	英语
scopus关键词	Article; controlled study; correlational study; global change; nonhuman; nutrient uptake; peatland; plant growth; plant root; priority journal; root growth; soil moisture; soil temperature; temperature measurement; warming; water transport
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/160868
作者单位	Malhotra, A., Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States, Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States; Brice, D.J., Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States, Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States; Childs, J., Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States, Climate Change Science Institute, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States; Graham, J.D., Department of Geosciences, Boise State University, Boise, ID 83725, United States; Hobbie, E.A., Earth Systems Research Center, University of New Hampshire, Durham, NH 03824, United States; Vander Stel, H., Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, United States, Climate Change Science Institute, Oak Ridge Nati...
推荐引用方式 GB/T 7714	Malhotra A.,Brice D.J.,Childs J.,et al. Peatland warming strongly increases fine-root growth[J],2020,117(30).
APA	Malhotra A..,Brice D.J..,Childs J..,Graham J.D..,Hobbie E.A..,...&Iversen C.M..(2020).Peatland warming strongly increases fine-root growth.Proceedings of the National Academy of Sciences of the United States of America,117(30).
MLA	Malhotra A.,et al."Peatland warming strongly increases fine-root growth".Proceedings of the National Academy of Sciences of the United States of America 117.30(2020).