Changing rainfall frequency rather than drought rapidly alters annual soil respiration in a tropical forest

doi:10.1016/j.soilbio.2018.02.023

CORC > 武汉植物园 > 中国科学院武汉植物园

	Changing rainfall frequency rather than drought rapidly alters annual soil respiration in a tropical forest
	Han, Xi 2; Deng, Qi 1; Zhang, Deqiang 1; Chu, Guowei 1; Zhang, Quanfa 2; Hui, Dafeng 3
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2018-06-01
卷号	121 页码:8-15
关键词	Climate change Dissolved organic carbon Rainfall change Soil respiration Tropical forests
ISSN号	0038-0717
DOI	10.1016/j.soilbio.2018.02.023
英文摘要	Tropical forests play an important role in global carbon (C) cycling due to high primary productivity and rapid litter and soil organic C decomposition. However, it is still unclear how changing rainfall will influence soil CO2 losses (i.e. via soil respiration) in tropical forests. Here, using a rainfall and litter manipulation experiment in a tropical forest, we show that enhanced litter-leached dissolved organic carbon (DOC) production with increased rainfall frequency drives substantial CO2 loss via soil respiration. A 50% increase in rainfall frequency (no change in total rainfall amount) enhanced inputs of DOC by 28%, total dissolved nitrogen (TDN) by 17%, and total dissolved phosphorus (TDP) by 34% through leaching from litter layer to soil surface likely due to faster litter decomposition rate, and stimulated soil respiration by similar to 17% (about 1.16 t C ha(-1) yr(-1)). Soil respiration responded to altered rainfall frequency with limited when litter layer was removed. Accordingly, soil microbial biomass C (MSC) and fine root biomass were increased by 23% and 20%, respectively only in the plots with litter layer. A 50% reduction in total rainfall (no change in rainfall frequency) did not change litter-leached DOC and nutrients fluxes, soil MBC, fine root biomass, or annual mean soil respiration rates. The new finding - that enhanced leached-DOC production with increased rainfall frequency drives profound increases in soil respiration in tropical forests - suggests that future climate changes may have significant impacts on soil C dynamics and global C budget, and argues for the importance of incorporating this underappreciated feedback into prognostic models used to predict future C-climate interactions.
资助项目	100 Talents Program of the Chinese Academy of Sciences[Y761031001] ; National Natural Science Foundation of China[31428001] ; National Natural Science Foundation of China[31200372] ; National Science Foundation[1504886] ; USDA-Capacity Building Grant ; USDA-Evans-Allen Grant
WOS研究方向	Agriculture
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000432884100004
内容类型	期刊论文
源URL	[http://202.127.146.157/handle/2RYDP1HH/5391]
专题	中国科学院武汉植物园
通讯作者	Zhang, Quanfa; Hui, Dafeng
作者单位	1.Chinese Acad Sci, South China Bot Garden, Key Lab Vegetat Restorat & Management Degraded Ec, Guangzhou 510650, Guangdong, Peoples R China 2.Chinese Acad Sci, Wuhan Bot Garden, Key Lab Aquat Bot & Watershed Ecol, Wuhan 430074, Hubei, Peoples R China 3.Tennessee State Univ, Dept Biol Sci, Nashville, TN 37209 USA
推荐引用方式 GB/T 7714	Han, Xi,Deng, Qi,Zhang, Deqiang,et al. Changing rainfall frequency rather than drought rapidly alters annual soil respiration in a tropical forest[J]. SOIL BIOLOGY & BIOCHEMISTRY,2018,121:8-15.
APA	Han, Xi,Deng, Qi,Zhang, Deqiang,Chu, Guowei,Zhang, Quanfa,&Hui, Dafeng.(2018).Changing rainfall frequency rather than drought rapidly alters annual soil respiration in a tropical forest.SOIL BIOLOGY & BIOCHEMISTRY,121,8-15.
MLA	Han, Xi,et al."Changing rainfall frequency rather than drought rapidly alters annual soil respiration in a tropical forest".SOIL BIOLOGY & BIOCHEMISTRY 121(2018):8-15.