干旱区生态环境知识资源中心(Arid): Rainfall amount and timing jointly regulate the responses of soil nitrogen transformation processes to rainfall increase in an arid desert ecosystem

Arid

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 1,2; Chen, Shiping 2; Zhou, Yadan 2; Lin, Guanghui 3
通讯作者	Song, Weimin ; Lin, Guanghui
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2020
卷号	364
英文摘要	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.
英文关键词	Arid ecosystem Nitrogen cycle Water manipulation Precipitation pulse Soil microbes Nitrogen balance
类型	Article
语种	英语
国家	Peoples R China
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000517855200010
WOS关键词	LEAF-LITTER DECOMPOSITION ; N-MINERALIZATION ; INCREASED PRECIPITATION ; ULTRAVIOLET-RADIATION ; TEMPORAL VARIATION ; USE EFFICIENCY ; CARBON ; DYNAMICS ; CHINA ; TEMPERATURE
WOS类目	Soil Science
WOS研究方向	Agriculture
来源机构	中国科学院植物研究所 ; 清华大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314587
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]. 中国科学院植物研究所, 清华大学,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).