气候变化领域集成服务门户(CCPortal): Grazing modifies inorganic and organic nitrogen uptake by coexisting plant species in alpine grassland

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DOI	10.1007/s00374-015-1069-1
	Grazing modifies inorganic and organic nitrogen uptake by coexisting plant species in alpine grassland
	Jiang, Lili; Wang, Shiping; Pang, Zhe; Wang, Changshun; Kardol, Paul; Zhou, Xiaoqi; Rui, Yichao; Lan, Zhi Chun; Wang, Yanfen; Xu, Xingliang
通讯作者	Jiang, LL (通讯作者)
发表日期	2016
ISSN	0178-2762
EISSN	1432-0789
起始页码	211
结束页码	221
卷号	52 期号:2
英文摘要	To study how grazing affects the uptake of inorganic and organic N forms, three focal plant species (i.e., the graminoid species Kobresia pygmaea, which decreases with grazing, and the forbs Potentilla bifurca and Potentilla multifida, which increase with grazing) were selected in ungrazed and grazed plots in an alpine meadow on the Tibetan Plateau. Three times during the growing season (i.e., June, July, and September), these plots were injected with N-15-labeled NO3--N, NH4+-N, or glycine-N, or with only water as a control. Two hours after N-15 injection, exchangeable NH4+-N, glycine-N, and NO3--N as well as plant and soil samples were collected and analyzed for N-15/N-14 and total N content. Our result showed that all three plant species took up glycine-N, but uptake of inorganic N was generally predominant. The graminoid K. pygmaea took up all three N forms equally in June but preferred NO3--N in July (particularly under grazing) and exchangeable NH4+-N in September. The forbs P. bifurca and P. multifida preferentially took up exchangeable NH4+-N in July (particularly under grazing), while NO3--N was the dominant form of N uptake in September. P. bifurca generally preferred exchangeable NH4+-N, but preference shifted toward NO3--N under grazing in June. P. multifida preferred glycine-N in ungrazed plots and shifted its preference to NO3--N under grazing in June. In conclusion, the three plant species showed niche partitioning for uptake of three forms of N across the season, which was modified by grazing. These findings indicate that plant N uptake patterns should be considered for better understanding the mechanisms of grazing effects on plant diversity and species coexistence.
关键词	SOIL MICROBES AMINO-ACIDS AVAILABILITY MINERALIZATION RESPONSES GLYCINE PRODUCTIVITY COMPETITION MICROORGANISMS ACQUISITION
英文关键词	Organic N; Inorganic N; Alpine meadow; Grazing; Community succession; Plant species coexistence; Tibetan Plateau
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:000373441100008
来源期刊	BIOLOGY AND FERTILITY OF SOILS
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/258847
推荐引用方式 GB/T 7714	Jiang, Lili,Wang, Shiping,Pang, Zhe,et al. Grazing modifies inorganic and organic nitrogen uptake by coexisting plant species in alpine grassland[J]. 中国科学院青藏高原研究所,2016,52(2).
APA	Jiang, Lili.,Wang, Shiping.,Pang, Zhe.,Wang, Changshun.,Kardol, Paul.,...&Xu, Xingliang.(2016).Grazing modifies inorganic and organic nitrogen uptake by coexisting plant species in alpine grassland.BIOLOGY AND FERTILITY OF SOILS,52(2).
MLA	Jiang, Lili,et al."Grazing modifies inorganic and organic nitrogen uptake by coexisting plant species in alpine grassland".BIOLOGY AND FERTILITY OF SOILS 52.2(2016).