Rainfall amount and timing jointly regulate the responses of soil nitrogen transformation processes to rainfall increase in an arid desert ecosystem

doi:10.1016/j.geoderma.2020.114197

	Rainfall amount and timing jointly regulate the responses of soil nitrogen transformation processes to rainfall increase in an arid desert ecosystem
	Song, Weimin 1; Chen, Shiping1 ; Zhou, Yadan 1; Lin, Guanghui 2
	2020
发表期刊	GEODERMA
ISSN	0016-7061
卷号	364
摘要	Climate models predict greater rainfall will occur in the arid and semiarid regions of Northwest China, where nitrogen (N) cycling is particularly sensitive to changes in rainfall regimes. Yet, how increasing rainfall regulates soil N transformation processes in these water-limited regions is still not well understood. We conducted a manipulative experiment in a desert ecosystem in Northwest China, whereby we simulated five different scenarios of future rain regimes (natural rains plus 0%, 25%, 50%, 75% and 100% of the local mean annual precipitation) each month from May to September in 2009. We examined in situ net N mineralization and soil N availability in both vegetated and bare soils, as well as leaf litter N release for the dominant shrub species Nitraria tangutorum monthly after each rain addition. We found that increased water availability via the simulated rain addition significantly decreased total net N mineralization rates over the growing season in both vegetated and bare soils. A larger amount of litter N was released after rain addition in vegetated soils, which could contribute to the higher concentrations of inorganic N in vegetated soils compared to bare soils. Furthermore, we found that the responses of soil N transformation processes to rain additions showed great seasonality, and thus both rainfall amount and timing jointly regulate the responses of soil N transformation processes to rainfall increase under future rainfall scenarios in this arid desert ecosystem. Over the growing season, rainfall addition reduced soil inorganic N concentrations but favored plant N uptake and microbial N immobilization. We suggest that the cycling of N will be greatly changed under future rainfall regimes, which may have consequences for ecosystem stability and functioning in this N-conserving desert ecosystem.
关键词	Arid ecosystem Nitrogen cycle Water manipulation Precipitation pulse Soil microbes Nitrogen balance
学科领域	Soil Science
DOI	10.1016/j.geoderma.2020.114197
收录类别	SCI
语种	英语
WOS关键词	LEAF-LITTER DECOMPOSITION ; N-MINERALIZATION ; INCREASED PRECIPITATION ; ULTRAVIOLET-RADIATION ; TEMPORAL VARIATION ; USE EFFICIENCY ; CARBON ; DYNAMICS ; CHINA ; TEMPERATURE
WOS研究方向	Agriculture
WOS记录号	WOS:000517855200010
出版者	ELSEVIER
文献子类	Article
出版地	AMSTERDAM
EISSN	1872-6259
资助机构	Science and Technologies Foundation of the Chinese Academy of Forestry [CAFYBB2007008] ; 973 program of Ministry of Science and Technology, China [2013CB956601] ; Strategic Priority Research Program of the Chinese Academy of Sciences, Climate Change: Carbon Budget and Relevant IssuesChinese Academy of Sciences [XDA05050402] ; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31170453, 41706097]
作者邮箱	wmsong@yic.ac.cn ; lingh@tsinghua.edu.cn
作品OA属性	Green Published
引用统计	被引频次：21[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/2S10CLM1/21884
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Yellow River Delta Ecol Res Stn Coastal Wetland, Yantai 264003, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Tsinghua Univ, Dept Earth Syst Sci, Key Lab Earth Syst Modeling, Minist Educ, Beijing 100084, Peoples R China
推荐引用方式 GB/T 7714	Song, Weimin,Chen, Shiping,Zhou, Yadan,et al. Rainfall amount and timing jointly regulate the responses of soil nitrogen transformation processes to rainfall increase in an arid desert ecosystem[J]. GEODERMA,2020,364.
APA	Song, Weimin,Chen, Shiping,Zhou, Yadan,&Lin, Guanghui.(2020).Rainfall amount and timing jointly regulate the responses of soil nitrogen transformation processes to rainfall increase in an arid desert ecosystem.GEODERMA,364.
MLA	Song, Weimin,et al."Rainfall amount and timing jointly regulate the responses of soil nitrogen transformation processes to rainfall increase in an arid desert ecosystem".GEODERMA 364(2020).

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