Grazing Offsets Nitrogen Enrichment Effects on Species Richness by Promoting the Random Colonization of Local Species in an Alpine Grassland

NWIPB OpenIR

	Grazing Offsets Nitrogen Enrichment Effects on Species Richness by Promoting the Random Colonization of Local Species in an Alpine Grassland
	Song, Ming-Hua; Chen, Jin; Xu, Xing-Liang; Li, Yi-Kang; Gao, Jun-Qin; OuYang, Hua
	2020
发表期刊	ECOSYSTEMS
卷号	23 期号:2
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.
关键词	clonality divergence grazing light limitation local extinction and colonization nitrogen enrichment plant traits species richness
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/60394
专题	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).