Grazing Offsets Nitrogen Enrichment Effects on Species Richness by Promoting the Random Colonization of Local Species in an Alpine Grassland
文献类型：期刊论文
| 作者 | Song, Ming-Hua; Chen, Jin; Xu, Xing-Liang; Li, Yi-Kang ; Gao, Jun-Qin; OuYang, Hua
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| 刊名 | ECOSYSTEMS
 |
| 出版日期 | 2020 |
| 卷号 | 23期号:2 |
| 关键词 | clonality divergence grazing light limitation local extinction and colonization nitrogen enrichment plant traits species richness |
| 英文摘要 | Nitrogen (N)-induced declines in species richness can be offset by grazing via the suppression of dominant species to increase ground-level light. However, it is not known whether grazing-mediated locally colonized species correspond to N-induced locally extinct species with regard to taxonomy or traits. Data from 11 years of N addition and winter grazing experiments were analyzed to assess species richness dynamics at community and functional group levels. Regarding N treatments, enclosure and N addition were performed during the first 7 years and were then followed by winter grazing with continuous N addition during the next 4 years. Additionally, all treatments were used to compare N-induced local species extinction and grazing-mediated local species colonization. Then, traits of N-induced locally extinct species and grazing-mediated locally colonized species were further correlated with plant traits. We found that N addition induced a decline in plant species richness as a result of both random and non-random species losses. The lost species were closely associated with traits, including low height, non-clonality, low special leaf area (SLA), and low leaf N concentrations, which are relevant to light capture capacity. In contrast, grazing promoted the random colonization of local rare species, thus offsetting the N-induced decline of species richness. However, non-randomly lost species were not rescued by grazing. Grazing-mediated locally colonized species were generally characterized by high leaf carbon (C) concentrations, SLA, and seed mass. Our study provides experimental evidence indicating although grazing offsets N-induced species reduction, shifts in species composition and traits could cause a divergence in ecosystem function facing anthropogenic alterations to nutrient cycles and grazing. |
| 源URL | [http://210.75.249.4/handle/363003/60394]  |
| 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 |
| 推荐引用方式 GB/T 7714 | Song, Ming-Hua,Chen, Jin,Xu, Xing-Liang,et al. Grazing Offsets Nitrogen Enrichment Effects on Species Richness by Promoting the Random Colonization of Local Species in an Alpine Grassland[J]. ECOSYSTEMS,2020,23(2). |
| APA | Song, Ming-Hua,Chen, Jin,Xu, Xing-Liang,Li, Yi-Kang,Gao, Jun-Qin,&OuYang, Hua.(2020).Grazing Offsets Nitrogen Enrichment Effects on Species Richness by Promoting the Random Colonization of Local Species in an Alpine Grassland.ECOSYSTEMS,23(2). |
| MLA | Song, Ming-Hua,et al."Grazing Offsets Nitrogen Enrichment Effects on Species Richness by Promoting the Random Colonization of Local Species in an Alpine Grassland".ECOSYSTEMS 23.2(2020). |
入库方式： OAI收割
来源：西北高原生物研究所
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