Effects of grazing on the acquisition of nitrogen by plants and microorganisms in an alpine grassland on the Tibetan plateau
Jiang, LL; Wang, SP; Zhe, P; Wang, CS; Kardol, P; Zhong, L; Yu, Q; Lan, ZC; Wang, YF; Xu, XL; Kuzyakov, Y; Luo, CY; Zhang, ZH; Jones, D
2017
Source PublicationPLANT AND SOIL
ISSN0032-079X
Volume416Issue:01-02Pages:297-308
AbstractNitrogen (N) limitation leads to intense competition between plants and soil microorganisms for available N. However, it is unclear how grazing affects the acquisition of N by plants and microorganisms. We conducted short-term N-15 tracer experiments during the growing season (June, early growing season; July, mid-growing season; and September, late growing season) in an alpine grassland on the Tibetan Plateau to investigate the effects of grazing on the acquisition of NO3 (-)-N, NH4 (+)-N, and glycine-N by plants and soil microorganisms. Three dominant plant species (one graminoid, Kobresia pygmaea, and two forbs, Potentilla bifurca and Potentilla multifida) were selected for the study. As these species represented > 90% of the vegetation, the plant recovery of N-15 reflected competition at the plant community. Grazing decreased the recovery of N-15 by soil microorganisms and plants by 46 and 69%, respectively, indicating that grazing strongly reduced the uptake of N-15 by plants and microorganisms and altered the partitioning of N-15 between them. Significant interactions were found between grazing, season and the different forms of N. In the absence of grazing, plants acquired relatively more N than soil microorganisms for the three forms of N in July and September, whereas the microorganisms obtained relatively more N-15 glycine in July and all three forms of N in September under grazing conditions. Under grazing, the plant root biomass played an important role in controlling plant-microbial N acquisition. Grazing alters the partitioning of inorganic and organic N between plants and soil microorganisms by reducing microbial N-15 recovery to a lesser extent than plant N-15 recovery. This indicates that heterotrophic microorganisms play an important part in N cycling in N-limited ecosystems.
SubtypeJournal
KeywordOrganic N Inorganic N N partitioning Grazing Tibetan plateau
Subject AreaAgriculture ; Plant Sciences
WOS Subject ExtendedAgronomy ; Plant Sciences ; Soil Science
WOS KeywordQINGHAI-XIZANG PLATEAU ; ORGANIC-NITROGEN ; SOIL-MICROORGANISMS ; INORGANIC NITROGEN ; MICROBIAL BIOMASS ; OXIDE PRODUCTION ; INNER-MONGOLIA ; COMPETITION ; MEADOW ; CARBON
Indexed BySCI
Language英语
WOS IDWOS:000405916400022
PublisherSPRINGER
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44041
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Jiang, LL,Wang, SP,Zhe, P,et al. Effects of grazing on the acquisition of nitrogen by plants and microorganisms in an alpine grassland on the Tibetan plateau[J]. PLANT AND SOIL,2017,416(01-02):297-308.
APA Jiang, LL.,Wang, SP.,Zhe, P.,Wang, CS.,Kardol, P.,...&Jones, D.(2017).Effects of grazing on the acquisition of nitrogen by plants and microorganisms in an alpine grassland on the Tibetan plateau.PLANT AND SOIL,416(01-02),297-308.
MLA Jiang, LL,et al."Effects of grazing on the acquisition of nitrogen by plants and microorganisms in an alpine grassland on the Tibetan plateau".PLANT AND SOIL 416.01-02(2017):297-308.
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