气候变化领域集成服务门户(CCPortal): Rhizosphere activity in an old-growth forest reacts rapidly to changes in soil moisture and shapes whole-tree carbon allocation

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DOI	10.1073/pnas.2014084117
	Rhizosphere activity in an old-growth forest reacts rapidly to changes in soil moisture and shapes whole-tree carbon allocation
	Joseph J.; Gao D.; Backes B.; Bloch C.; Brunner I.; Gleixner G.; Haeni M.; Hartmann H.; Hoch G.; Hug C.; Kahmen A.; Lehmann M.M.; Li M.-H.; Luster J.; Peter M.; Poll C.; Rigling A.; Rissanen K.A.; Ruehr N.K.; Saurer M.; Schaub M.; Schönbeck L.; Stern B.; Thomas F.M.; Werner R.A.; Werner W.; Wohlgemuth T.; Hagedorn F.; Gessler A.
发表日期	2020
ISSN	0027-8424
起始页码	24885
结束页码	24892
卷号	117 期号:40
英文摘要	Drought alters carbon (C) allocation within trees, thereby impairing tree growth. Recovery of root and leaf functioning and prioritized C supply to sink tissues after drought may compensate for droughtinduced reduction of assimilation and growth. It remains unclear if C allocation to sink tissues during and following drought is controlled by altered sink metabolic activities or by the availability of new assimilates. Understanding such mechanisms is required to predict forests' resilience to a changing climate.We investigated the impact of drought and drought release on C allocation in a 100-y-old Scots pine forest. We applied 13CO2 pulse labeling to naturally dry control and long-term irrigated trees and tracked the fate of the label in above- and belowground C pools and fluxes. Allocation of new assimilates belowground was ca. 53% lower under nonirrigated conditions. A short rainfall event, which led to a temporary increase in the soil water content (SWC) in the topsoil, strongly increased the amounts of C transported belowground in the nonirrigated plots to values comparable to those in the irrigated plots. This switch in allocation patterns was congruent with a tipping point at around 15% SWC in the response of the respiratory activity of soil microbes. These results indicate that the metabolic sink activity in the rhizosphere and its modulation by soil moisture can drive C allocation within adult trees and ecosystems. Even a subtle increase in soil moisture can lead to a rapid recovery of belowground functions that in turn affects the direction of C transport in trees. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	13C pulse labeling; Drought; Drought release; Sink control
语种	英语
scopus关键词	carbon; water; chemistry; climate change; drought; ecosystem; forest; growth, development and aging; metabolism; plant leaf; plant root; rhizosphere; Scots pine; soil; tree; Carbon; Climate Change; Droughts; Ecosystem; Forests; Pinus sylvestris; Plant Leaves; Plant Roots; Rhizosphere; Soil; Trees; Water
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/160781
作者单位	Joseph, J., Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, 8903, Switzerland; Gao, D., Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, 8903, Switzerland, School of Geographical Sciences, Northeast Normal University, Changchun, 130024, China; Backes, B., Geobotany, University of Trier, Trier, 54296, Germany; Bloch, C., Physiological Plant Ecology, University of Basel, Basel, 4056, Switzerland; Brunner, I., Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, 8903, Switzerland; Gleixner, G., Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena, 07745, Germany; Haeni, M., Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, 8903, Switzerland; Hartmann, H., Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena, 07745, Germany; Hoch, G., Physiological Plant Ecology, University of Basel, Basel, 4056, Switzerland; Hug, C., Swiss Federal Institute for Forest, Snow a...
推荐引用方式 GB/T 7714	Joseph J.,Gao D.,Backes B.,et al. Rhizosphere activity in an old-growth forest reacts rapidly to changes in soil moisture and shapes whole-tree carbon allocation[J],2020,117(40).
APA	Joseph J..,Gao D..,Backes B..,Bloch C..,Brunner I..,...&Gessler A..(2020).Rhizosphere activity in an old-growth forest reacts rapidly to changes in soil moisture and shapes whole-tree carbon allocation.Proceedings of the National Academy of Sciences of the United States of America,117(40).
MLA	Joseph J.,et al."Rhizosphere activity in an old-growth forest reacts rapidly to changes in soil moisture and shapes whole-tree carbon allocation".Proceedings of the National Academy of Sciences of the United States of America 117.40(2020).