Grazing and fertilization influence plant species richness via direct and indirect pathways in an alpine meadow of the eastern Tibetan Plateau | |
Zhang, C.1; Li, J.4; Du, G.4; Zhou, X.4; Guo, H.2; Yang, Z.3 | |
刊名 | GRASS AND FORAGE SCIENCE |
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 |
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 |
语种 | 英语 |
WOS记录号 | WOS:000401854700014 |
内容类型 | 期刊论文 |
源URL | [http://ir.nwipb.ac.cn/handle/363003/7093] |
专题 | 西北高原生物研究所_中国科学院西北高原生物研究所 |
作者单位 | 1.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining, Peoples R China 2.Nanjing Agr Univ, Coll Resources & Environm Sci, Soil Ecol Lab, Nanjing, Jiangsu, Peoples R China 3.Henan Univ, Coll Life Sci, State Key Lab Cotton Biol, Key Lab Plant Stress Biol, Kaifeng, Peoples R China 4.Lanzhou Univ, Sch Life Sci, State Key Lab Grassland & Agroecosyst, Lanzhou 730000, Peoples R China |
推荐引用方式 GB/T 7714 | Zhang, C.,Li, J.,Du, G.,et al. Grazing and fertilization influence plant species richness via direct and indirect pathways in an alpine meadow of the eastern Tibetan Plateau[J]. GRASS AND FORAGE SCIENCE,2017,72(2):343-354. |
APA | Zhang, C.,Li, J.,Du, G.,Zhou, X.,Guo, H.,&Yang, Z..(2017).Grazing and fertilization influence plant species richness via direct and indirect pathways in an alpine meadow of the eastern Tibetan Plateau.GRASS AND FORAGE SCIENCE,72(2),343-354. |
MLA | Zhang, C.,et al."Grazing and fertilization influence plant species richness via direct and indirect pathways in an alpine meadow of the eastern Tibetan Plateau".GRASS AND FORAGE SCIENCE 72.2(2017):343-354. |
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