高原鼠兔干扰对高寒草甸植物物种和功能性状beta多样性的影响

采用野外空间多点同步取样,分析了高原鼠兔干扰对高寒草甸植物物种beta多样性和植物功能性状beta多样性的影响,确定了高原鼠兔干扰下高寒草甸植物物种和功能性状beta多样性的变化途径,分别提出了高原鼠兔干扰区域内,基于植物物种多样性和功能性状多样性的高寒草甸植物多样性维持策略。结果表明,高原鼠兔干扰使高寒草甸植物物种相似性显著降低了28.1%,植物功能相似性降低了28.7%。尽管高原鼠兔干扰没有改变高寒草甸植物物种和功能性状beta多样性的变化途径,且对植物物种和功能性状的嵌套组分不存在显著影响,但高原鼠兔干扰显著降低了植物物种和功能性状周转组分所占的比例,降幅分别为36.6%和34.3%。高原鼠兔干扰区域内,高寒草甸植物物种beta多样性的变化以周转为主导(周转占比81.4%;嵌套占比:18.6%),植物功能性状beta多样性的变化以嵌套为主导(嵌套占比64.9%;周转占比35.1%)。因此,针对划定的高原鼠兔干扰区,需要同时保护区域内所有高原鼠兔栖息地(多位点保护),以达到维持植物物种多样性的目的,而可以仅通过保护该区域内植物功能性状丰富的位点,即可维持较高的植物功能多样性。

Effect of plateau pika disturbance on the beta diversity of plant species and functional traits in alpine meadows

This study employs the synchronized multi-point field sampling to investigate the influence of plateau pika disturbance on the beta diversity of plant species and functional traits in alpine meadows. We identify the pathways of change in the beta diversity of both species and functional traits under plateau pika disturbance, and outline strategies for maintaining plant diversity in alpine meadows, within regions disturbed by plateau pikas based on plant species diversity and functional trait diversity. The results demonstrate that the plateau pika disturbance significantly decreases the similarity of plant species by 28.1% and functional trait similarity by 28.7%. Although plateau pika disturbance does not alter the pathways of change in species and functional trait beta diversity and does not have a significant impact on the nestedness component of species and functional traits, the disturbance significantly reduces the proportion of turnover components in both plant species and functional traits by 36.6% and 34.3%, respectively. Within regions disturbed by plateau pikas, the variation in species beta diversity in alpine meadow plants is largely attributed to turnover (turnover accounts for 81.4%; nestedness accounts for 18.6%). In contrast, the change in functional trait beta diversity is predominantly driven by nestedness (nestedness accounts for 64.9%; turnover accounts for 35.1%). Consequently, for the designated plateau pika disturbance zones, it is necessary to protect all plateau pika habitats within these regions (multi-site protection) to achieve the goal of maintaining plant species diversity. Meanwhile, maintaining a high level of plant functional diversity can be achieved by emphasizing on protecting sites within the region that are rich in plant functional traits.