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题名: Grazing and fertilization influence plant species richness via direct and indirect pathways in an alpine meadow of the eastern Tibetan Plateau
作者: Li, J.1; Zhang, C.2; Yang, Z.3; Guo, H.4; Zhou, X.1; Du, G.1
刊名: GRASS AND FORAGE SCIENCE
出版日期: 2017-06-01
卷号: 72, 期号:2, 页码:343-354
关键词: alpine grassland ; grazing ; nitrogen fertilizer ; species richness ; structural equation modelling ; Tibet
DOI: 10.1111/gfs.12232
文章类型: Article
英文摘要: Grazing and fertilization influence plant species richness through multiple pathways, but the exact pathways and their relative contributions are unclear. Here, we report on a 3-year field experiment on an alpine meadow in which we manipulated grazing and fertilization simultaneously to assess their direct and indirect effects on plant species richness. Results indicated that both grazing and fertilization significantly influenced plant species richness via above- and belowground pathways. Specifically, the direct effect of grazing (-0.30, effect size) on species richness was negative, mainly due to selective feeding. This was comparable, in magnitude, to a positive indirect effect of grazing (0.36) on species richness, due to decreased aboveground biomass and increased belowground biomass. The direct effect of fertilization (-0.34) on species richness was negative, which was attributed to the changes of soil pH and available nitrogen; this effect was double the indirect effect (-0.16), which largely stemmed from the increased aboveground biomass rather than changes in belowground biomass. No significant interaction of grazing and fertilization on species richness was observed, but the effect of fertilization on species richness was masked by the effect of grazing in the combined treatment. It was concluded that moderate nitrogen addition (<51.0 kg N ha(-1) year(-1)) could increase local pasture productivity while also sustaining species richness stability.
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Agronomy
研究领域[WOS]: Agriculture
关键词[WOS]: PERENNIAL GRASS MIXTURES ; DIVERSITY ; COMPETITION ; PRODUCTIVITY ; BIODIVERSITY ; REGION ; LIGHT ; COMMUNITIES ; NUTRIENTS ; ECOSYSTEM
收录类别: SCI
项目资助者: National Natural Science Foundation of China(41430749)
语种: 英语
WOS记录号: WOS:000401854700014
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内容类型: 期刊论文
URI标识: http://210.75.249.4/handle/363003/7093
Appears in Collections:中国科学院西北高原生物研究所_期刊论文

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作者单位: 1.Lanzhou Univ, Sch Life Sci, State Key Lab Grassland & Agroecosyst, Lanzhou 730000, Peoples R China
2.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining, Peoples R China
3.Henan Univ, Coll Life Sci, State Key Lab Cotton Biol, Key Lab Plant Stress Biol, Kaifeng, Peoples R China
4.Nanjing Agr Univ, Coll Resources & Environm Sci, Soil Ecol Lab, Nanjing, Jiangsu, Peoples R China
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