Decoupling of soil microbes and plants with increasing anthropogenic nitrogen inputs in a temperate steppe

doi:10.1016/j.soilbio.2014.01.022

	Decoupling of soil microbes and plants with increasing anthropogenic nitrogen inputs in a temperate steppe
	Liu, Weixing ; Jiang, Lin 1; Hu, Shuijin 2; Li, Linghao; Liu, Lingli; Wan, Shiqiang 3
	2014
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY
ISSN	0038-0717
卷号	72 页码:116-122
摘要	Plant growth and soil microbial activity are intrinsically correlated. Numerous evidence shows that nitrogen (N) deposition can greatly alter both processes. However, it is unknown whether such changes caused by N deposition can create new dynamics between plants and soil microbes. This study was conducted with an attempt to examine the plant microbe relationship along an N addition gradient. Eight levels of N addition (0,1, 2, 4, 8,16, 32, 64 g N m(-2)) were applied annually in a temperate steppe in northern China since 2003. Plant and soil samples were collected from 2005 to 2007. We found that N addition acidified soil significantly. Both plant aboveground biomass and dissolved organic carbon (DOC) increased with increasing N input. However, soil microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and (soil) microbial respiration showed nonlinear responses to N input. Low levels of N inputs stimulated MBC, MBN and microbial respiration, whereas high levels of N input suppressed them. Although MBC and MBN were both positively correlated with aboveground biomass at each level of N treatments, the dependence of such biomass on MBC and MBN declined with the increase in N addition, as indicated by the exponential decreases in the regression coefficients. The weakened linkage between aboveground biomass and MBC was mostly attributed to soil acidification. The decrease in soil pH caused by elevated N inputs reduced soil microbial activities, but not plant growth. Overall, our results revealed a trend of shifting plant microbe relationship from coupling to decoupling with the increase of N input. The divergent responses of plants and soil microbial activities under intensified N addition could have consequent impacts on ecosystem function and services. (C) 2014 Elsevier Ltd. All rights reserved.
关键词	Soil acidification Decoupling Grassland Plant Soil microbes N addition
学科领域	Soil Science
DOI	10.1016/j.soilbio.2014.01.022
收录类别	SCI
语种	英语
WOS关键词	PRIMARY PRODUCTIVITY ; CARBON ; LIMITATION ; ACIDIFICATION ; METAANALYSIS ; PHOSPHORUS ; DEPOSITION ; COMMUNITY ; BIOMASS ; BIODIVERSITY
WOS研究方向	Agriculture
WOS记录号	WOS:000334973700015
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
EISSN	1879-3428
资助机构	National Natural Science Foundation of China [31370488] ; Chinese National Key Development Program for Basic Research [2013CB956304] ; Yong Project of State Key Laboratory of Vegetation and Environmental Change [2011qnrc04]
作者邮箱	lwxsx@ibcas.ac.cn
引用统计	被引频次：65[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/27055
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Georgia Inst Technol, Sch Biol, Atlanta, GA 30332 USA 3.N Carolina State Univ, Dept Plant Pathol, Raleigh, NC 27695 USA 4.Henan Univ, Coll Life Sci, Key State Lab Cotton Biol, Kaifeng 475004, Henan, Peoples R China
推荐引用方式 GB/T 7714	Liu, Weixing,Jiang, Lin,Hu, Shuijin,et al. Decoupling of soil microbes and plants with increasing anthropogenic nitrogen inputs in a temperate steppe[J]. SOIL BIOLOGY & BIOCHEMISTRY,2014,72:116-122.
APA	Liu, Weixing,Jiang, Lin,Hu, Shuijin,Li, Linghao,Liu, Lingli,&Wan, Shiqiang.(2014).Decoupling of soil microbes and plants with increasing anthropogenic nitrogen inputs in a temperate steppe.SOIL BIOLOGY & BIOCHEMISTRY,72,116-122.
MLA	Liu, Weixing,et al."Decoupling of soil microbes and plants with increasing anthropogenic nitrogen inputs in a temperate steppe".SOIL BIOLOGY & BIOCHEMISTRY 72(2014):116-122.

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