气候变化领域集成服务门户(CCPortal): Effects of grazing on the acquisition of nitrogen by plants and microorganisms in an alpine grassland on the Tibetan plateau

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DOI	10.1007/s11104-017-3205-1
	Effects of grazing on the acquisition of nitrogen by plants and microorganisms in an alpine grassland on the Tibetan plateau
	Jiang, Lili; Wang, Shiping; Zhe, Pang; Wang, Changshun; Kardol, Paul; Zhong, Lei; Yu, Qiang; Lan, Zhichun; Wang, Yanfen; Xu, Xingliang; Kuzyakov, Yakov; Luo, Caiyun; Zhang, Zhenhua; Jones, Davey L.
通讯作者	Jiang, LL (通讯作者)
发表日期	2017
ISSN	0032-079X
EISSN	1573-5036
起始页码	297
结束页码	308
卷号	416 期号:1-2
英文摘要	Nitrogen (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.
关键词	QINGHAI-XIZANG PLATEAU ORGANIC-NITROGEN SOIL-MICROORGANISMS INORGANIC NITROGEN MICROBIAL BIOMASS OXIDE PRODUCTION COMPETITION CARBON NUTRIENT AMMONIUM
英文关键词	Organic N; Inorganic N; N partitioning; Grazing; Tibetan plateau
语种	英语
WOS研究方向	Agriculture ; Plant Sciences
WOS类目	Agronomy ; Plant Sciences ; Soil Science
WOS记录号	WOS:000405916400022
来源期刊	PLANT AND SOIL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259099
推荐引用方式 GB/T 7714	Jiang, Lili,Wang, Shiping,Zhe, Pang,et al. Effects of grazing on the acquisition of nitrogen by plants and microorganisms in an alpine grassland on the Tibetan plateau[J]. 中国科学院青藏高原研究所,2017,416(1-2).
APA	Jiang, Lili.,Wang, Shiping.,Zhe, Pang.,Wang, Changshun.,Kardol, Paul.,...&Jones, Davey L..(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(1-2).
MLA	Jiang, Lili,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 416.1-2(2017).