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学科主题: 生物科学::普通生物学
题名: Grazing modifies inorganic and organic nitrogen uptake by coexisting plant species in alpine grassland
作者: Jiang, LL (Jiang, Lili)1; Wang, SP (Wang, Shiping)1, 2; Pang, Z (Pang, Zhe)4; Wang, CS (Wang, Changshun)1; Kardol, P (Kardol, Paul)5; Zhou, XQ (Zhou, Xiaoqi)6; Rui, YC (Rui, Yichao)7; Lan, ZC (Lan, Zhi Chun)8; Wang, YF (Wang, Yanfen)4; Xu, XL (Xu, Xingliang)3
通讯作者: Jiang, LL
刊名: BIOLOGY AND FERTILITY OF SOILS
发表日期: 2016
DOI: 10.1007/s00374-015-1069-1
卷: 52, 期:2, 页:211-221
收录类别: SCI
合作性质: 国际
文章类型: Article
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.
语种: 英语
WOS记录号: WOS:000373441100008
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7762
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
4.Univ Chinese Acad Sci, Coll Life Sci, Beijing 100049, Peoples R China
5.Swedish Univ Agr Sci, Dept Forest Ecol & Management, S-90183 Umea, Sweden
6.Griffith Univ, Environm Futures Res Inst, Brisbane, Qld 4111, Australia
7.Univ Western Australia, Sch Earth & Environm, Soil Biol & Mol Ecol Lab, Crawley, WA 6009, Australia
8.Nanchang Univ, Inst Life Sci, Ctr Watershed Ecol, Nanchang 330031, Peoples R China

Recommended Citation:
Jiang, LL ,Wang, SP ,Pang, Z ,et al. Grazing modifies inorganic and organic nitrogen uptake by coexisting plant species in alpine grassland[J]. BIOLOGY AND FERTILITY OF SOILS,2016,52(2):211-221.
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