Appropriate livestock grazing alleviates the loss of plant diversity and maintains community resistance in alpine meadows

放牧 保护性放牧 抗性(生态学) 生物量(生态学) 牲畜 生物多样性 环境科学 植物群落 生态稳定性 生态学 放牧压力 食草动物 高原(数学) 扰动(地质) 生态系统 农学 生态演替 生物 数学分析 古生物学 数学
作者
Xiaofang Wang,Zaiwei Wang,Haitao Miao,Chunping Zhang,Hao Zou,Yunfeng Yang,Zhenghua Zhang,Jie Liu
出处
期刊:Journal of Environmental Management [Elsevier BV]
卷期号:351: 119850-119850 被引量:4
标识
DOI:10.1016/j.jenvman.2023.119850
摘要

Alpine meadows constitute one of the major ecosystems on the Qinghai-Tibetan Plateau, with livestock grazing exerting a considerable impact on their biodiversity. However, the degree to which plant diversity influences community stability under different grazing intensities remains unclear in this region. This study conducted controlled grazing experiments across four levels of grazing intensity (no-, low-, medium-, and high-grazing) based on herbage utilization rate to assess the influence of grazing intensities on plant community structure and diversity-stability relationships. We discovered that high-grazing reduced plant diversity and attenuated the temporal stability and resistance of above-ground biomass. No- and low-grazing could alleviate plant biomass loss, with community resistance being optimal under low-grazing. The direct effects of livestock grazing on temporal stability were found to be negligible. Plant characteristics and diversity accounted for a substantial proportion of livestock grazing effects on community resistance (R2 = 0.46), as revealed by piecewise structural equation model analysis. The presence of plant diversity enhances the resistance of alpine meadows against disturbance and accelerates the recovery after grazing. Our results suggest that low-grazing intensity may represent a judicious option for preserving species diversity and community stability on the Qinghai-Tibetan Plateau.
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