IB-CAS  > 植被与环境变化国家重点实验室
Rainfall amount and timing jointly regulate the responses of soil nitrogen transformation processes to rainfall increase in an arid desert ecosystem
Song, Weimin1; Chen, Shiping1; Zhou, Yadan1; Lin, Guanghui2
2020
Source PublicationGEODERMA
ISSN0016-7061
Volume364
AbstractClimate 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.
KeywordArid ecosystem Nitrogen cycle Water manipulation Precipitation pulse Soil microbes Nitrogen balance
Subject AreaSoil Science
DOI10.1016/j.geoderma.2020.114197
Indexed BySCI
Language英语
WOS KeywordLEAF-LITTER DECOMPOSITION ; N-MINERALIZATION ; INCREASED PRECIPITATION ; ULTRAVIOLET-RADIATION ; TEMPORAL VARIATION ; USE EFFICIENCY ; CARBON ; DYNAMICS ; CHINA ; TEMPERATURE
WOS Research AreaAgriculture
WOS IDWOS:000517855200010
PublisherELSEVIER
SubtypeArticle
Publication PlaceAMSTERDAM
EISSN1872-6259
Funding OrganizationScience 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]
Corresponding Author Emailwmsong@yic.ac.cn ; lingh@tsinghua.edu.cn
OAGreen Published
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Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ibcas.ac.cn/handle/2S10CLM1/21884
Collection植被与环境变化国家重点实验室
Affiliation1.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
Recommended Citation
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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