Warming effects on root morphological and physiological traits: The potential consequences on soil C dynamics as altered root exudation

doi:10.1016/j.agrformet.2013.06.016

CORC > 成都生物研究所 > 中国科学院成都生物研究所 > 生物多样性与生态系统服务领域 > 中国科学院山地生态恢复与生物资源利用重点实验室

	Warming effects on root morphological and physiological traits: The potential consequences on soil C dynamics as altered root exudation
	Yin, Huajun 1,2; Xiao, Juan 1,2; Li, Yufei 1,2; Chen, Zhi 1,2; Cheng, Xinying 1,2; Zhao, Chunzhang 1,2; Liu, Qing 1,2
刊名	AGRICULTURAL AND FOREST METEOROLOGY
	2013-10-15
卷号	180 页码:287-296
关键词	Tree species Root exudation Soil respiration Temperature sensitivity Global warming
ISSN号	0168-1923
DOI	10.1016/j.agrformet.2013.06.016
产权排序	1
文献子类	Article
英文摘要	Root and rhizosphere processes contribute significantly to soil carbon (C) fluxes, yet mechanism by which they do are not well understood. One of the contributing factors to this uncertainty is the lack of understanding about the role of root-derived labile C inputs in influencing soil organic matter (SUM) decomposition. We conducted an experiment to compare the pure impacts of two coniferous species through roots on the soil CO2 efflux and examine the species' response to experimental warming using infrared heaters. Warming markedly increased exudation rates I (mu g C cm(-1) root length h(-1)) and II (mu g C cm(-2) root area h(-1)) in the two species plots; however, the Picea asperata species had significantly higher root exudation rates than that of the Abies faxoniana species, regardless of warming treatment. The differences in the root morphological and physiological traits between the two species could be responsible for this variation in exudation and response to experimental warming. The P. asperata plots had significantly higher soil respiration rates (2.36 mu mol m(-2) s(-1) on average) relative to the A. faxoniana plots (2.02 mu mol m(-2) s(-1) on average). Similarly, the temperature sensitivity of SUM decomposition (Q(10)) was 1.19 times higher in the P. asperata plots than the A. faxoniana plots. The magnitude and direction of warming effects on the soil CO2 efflux varied considerably with tree species. The warming marginally increased the mean soil respiration by 5.3% in the P. asperata plots and significantly decreased the mean soil respiration by 10.8% in the A. faxoniana plots over the 4-year period. Our results collectively provide robust evidence that tree species can differ in their effects on shaping Q(10) and controlling the soil CO2 efflux via root exudation, thereby implying altered patterns of soil C cycle between tree species in response to global warming. This calls for incorporating root-derived C inputs in controlling the microbial regulation of SUM decomposition in climate-carbon models to better predict soil C dynamics under global environmental change. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	Agriculture/agronomy
URL标识	查看原文
WOS关键词	TEMPERATURE SENSITIVITY ; SUBSTRATE AVAILABILITY ; MICROBIAL FEEDBACKS ; CARBON TURNOVER ; RESPIRATION ; FOREST ; DECOMPOSITION ; ACCLIMATION ; TRANSFORMATIONS ; FERTILITY
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000324511100028
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/29916]
专题	生物多样性与生态系统服务领域_中国科学院山地生态恢复与生物资源利用重点实验室
通讯作者	Liu, Qing
作者单位	1.Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Peoples R China; 2.Chinese Acad Sci, Ecol Restorat Biodivers Conservat Key Lab Sichuan, Key Lab Mt Ecol Restorat & Bioresource Utilizat, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Yin, Huajun,Xiao, Juan,Li, Yufei,et al. Warming effects on root morphological and physiological traits: The potential consequences on soil C dynamics as altered root exudation[J]. AGRICULTURAL AND FOREST METEOROLOGY,2013,180:287-296.
APA	Yin, Huajun.,Xiao, Juan.,Li, Yufei.,Chen, Zhi.,Cheng, Xinying.,...&Liu, Qing.(2013).Warming effects on root morphological and physiological traits: The potential consequences on soil C dynamics as altered root exudation.AGRICULTURAL AND FOREST METEOROLOGY,180,287-296.
MLA	Yin, Huajun,et al."Warming effects on root morphological and physiological traits: The potential consequences on soil C dynamics as altered root exudation".AGRICULTURAL AND FOREST METEOROLOGY 180(2013):287-296.