Climate change drivers alter root controls over litter decomposition in a semi-arid grassland

doi:10.1016/j.soilbio.2021.108278

	Climate change drivers alter root controls over litter decomposition in a semi-arid grassland
	Li, Zhen 1; Wang, Fuwei 1; Su, Fanglong 1; Wang, Peng 1; Li, Shijie 1; Bai, Tongshuo 1; Wei, Yanan 1; Liu, Manqiang 1; Chen, Dima 2; Zhu, Weixing 3
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2021-07-01
卷号	158 页码:9
关键词	Climate change Litter decomposition Priming effect Semi-arid grasslands Water availability
ISSN号	0038-0717
DOI	10.1016/j.soilbio.2021.108278
通讯作者	Wang, Yi(wangyi@ieecas.cn) ; Hu, Shuijin(shuijin_hu@hotmail.com)
英文摘要	Plant roots are the primary source of soil organic carbon (C) and critically support the growth and activities of microbes in the rhizosphere. Climate change factors may, however, modify root-microbial interactions and impact C dynamics in the rhizosphere. Yet, the direction and magnitude of interactive climate change effects, as well as the underlying mechanisms, remain unclear. Here we show evidence from a field experiment demonstrating that warming and precipitation changes strengthen root controls over litter decomposition in a semi-arid grassland. While warming and precipitation reduction suppressed microbial decomposition of root litter regardless of the root presence, precipitation increase stimulated litter decomposition only in the absence of roots, suggesting that plant competition for water constraints the activities of saprophytic microbes. Root presence increased microbial biomass but reduced microbial activities such as respiration, C cycling enzymes and litter decomposition, indicating that roots exert differential effects on microbes through altering C or water availability. In addition, nitrogen (N) input significantly reduced microbial biomass and microbial activities (respiration). Together, these results showed that alterations in soil moisture induced by climate change drivers critically modulate root controls over microbial decomposition in soil. Our findings suggest that warming-enhanced plant water utilization, combined with N-induced suppression of microbes, may provide a unique mechanism through which moderate increases in precipitation, warming and N input interactively suppress microbial decomposition, thereby facilitating short-term soil C sequestration in the arid and semi-arid grasslands.
资助项目	National Key R&D Program of China[2017YFC0503902] ; National Science Foundation of China[41671269]
WOS关键词	ORGANIC-MATTER DECOMPOSITION ; SOIL-CARBON ; MICROBIAL BIOMASS ; GLOBAL PATTERNS ; TEMPERATURE ; DYNAMICS ; WATER ; MECHANISMS ; ENZYMES ; RHIZODEPOSITION
WOS研究方向	Agriculture
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000652093800009
资助机构	National Key R&D Program of China ; National Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/16515]
专题	地球环境研究所_生态环境研究室
通讯作者	Wang, Yi; Hu, Shuijin
作者单位	1.Nanjing Agr Univ, Coll Resources & Environm Sci, Ecosyst Ecol Lab, Nanjing 210095, Peoples R China 2.China Three Gorges Univ, Coll Biol & Pharmaceut Sci, Yichang 443500, Peoples R China 3.SUNY Binghamton, Dept Biol Sci, Binghamton, NY 13902 USA 4.Univ Calif Davis, Dept Plant Sci, 1210 PES Mail Stop 1,One Shields Ave, Davis, CA 95616 USA 5.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 6.North Carolina State Univ, Dept Entomol & Plant Pathol, Raleigh, NC 27695 USA
推荐引用方式 GB/T 7714	Li, Zhen,Wang, Fuwei,Su, Fanglong,et al. Climate change drivers alter root controls over litter decomposition in a semi-arid grassland[J]. SOIL BIOLOGY & BIOCHEMISTRY,2021,158:9.
APA	Li, Zhen.,Wang, Fuwei.,Su, Fanglong.,Wang, Peng.,Li, Shijie.,...&Hu, Shuijin.(2021).Climate change drivers alter root controls over litter decomposition in a semi-arid grassland.SOIL BIOLOGY & BIOCHEMISTRY,158,9.
MLA	Li, Zhen,et al."Climate change drivers alter root controls over litter decomposition in a semi-arid grassland".SOIL BIOLOGY & BIOCHEMISTRY 158(2021):9.