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Different strategies for regulating free-living N-2 fixation in nutrient-amended subtropical and temperate forest soils
Tang, Yuqian1,3; Yu, Guirui1,3; Zhang, Xinyu1,3; Wang, Qiufeng1,3; Tian, Jing1,3; Niu, Shuli1,3; Tian, Dashuan1; Ge, Jianping1,2
2019-04-01
Source PublicationAPPLIED SOIL ECOLOGY
ISSN0929-1393
Volume136Pages:21-29
Corresponding AuthorYu, Guirui(yugr@igsnrr.ac.cn) ; Zhang, Xinyu(zhangxy@igsnrr.ac.cn)
AbstractBiological nitrogen (N-2) fixation by free-living diazotrophs is an important source of bioavailable N in forest ecosystems. However, little is known about how these free-living diazotrophs are affected by exogenous nitrogen (N) and phosphorus (P) additions. Set in the context of increases in both N deposition and P deficits in forest soils, we examined how the abundance, composition, and activity of free-living microbes from the diazotrophic functional group changed in response to N and/or P additions, and identified the main factors that drove free-living N-2 fixation in nutrient-amended subtropical and temperate forest soils. We found that the free-living N-2 fixation was higher in the temperate soils than in the subtropical soils, which was mainly explained by the soil pH. The compositions and richness of the free-living diazotrophs were stable, but different strategies were used to regulate the N-2 fixation in these two sites. While the free-living N-2 fixation did not change much when P was added, it decreased when N was added to the temperate soils, reflecting a decrease in the abundance of the nifH gene. In the subtropical soils, the free-living N-2 fixation was mainly stimulated at the physiological level by P additions and did not change when N was added. The nifH gene abundances and soil available P concentrations were the main predictors on N-2 fixation by free-living diazotrophs in nutrient-amended temperate and subtropical forest soils, respectively, and so should be considered when modelling N cycling in these ecosystems under scenarios of increased N deposition and P deficiency.
KeywordFree-living nitrogen fixation Nitrogen additions Phosphorus additions Temperate forest soils Subtropical forest soils
DOI10.1016/j.apsoil.2018.12.014
WOS KeywordBIOLOGICAL NITROGEN-FIXATION ; PHOSPHORUS LIMITATION ; COMMUNITY STRUCTURE ; LEAF-LITTER ; PATTERNS ; DIVERSITY ; GENES ; STOICHIOMETRY ; N-2-FIXATION ; ACQUISITION
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[31420103917] ; National Natural Science Foundation of China[41571251] ; National Natural Science Foundation of China[31290221]
Funding OrganizationNational Natural Science Foundation of China
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000458477300003
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/49412
Collection中国科学院地理科学与资源研究所
Corresponding AuthorYu, Guirui; Zhang, Xinyu
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
2.Beijing Normal Univ, Coll Life Sci, Beijing 100875, Peoples R China
3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Tang, Yuqian,Yu, Guirui,Zhang, Xinyu,et al. Different strategies for regulating free-living N-2 fixation in nutrient-amended subtropical and temperate forest soils[J]. APPLIED SOIL ECOLOGY,2019,136:21-29.
APA Tang, Yuqian.,Yu, Guirui.,Zhang, Xinyu.,Wang, Qiufeng.,Tian, Jing.,...&Ge, Jianping.(2019).Different strategies for regulating free-living N-2 fixation in nutrient-amended subtropical and temperate forest soils.APPLIED SOIL ECOLOGY,136,21-29.
MLA Tang, Yuqian,et al."Different strategies for regulating free-living N-2 fixation in nutrient-amended subtropical and temperate forest soils".APPLIED SOIL ECOLOGY 136(2019):21-29.
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