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人类活动对四川长沙贡玛湿地高原鼠兔种群密度的影响

Effects of human activities on population density of Ochotona curzoniae in Sichuan Changshagongma Wetlands

  • 摘要: 以四川长沙贡玛湿地为研究区域,深入探究放牧强度、中药材采集频次、居民点距离和道路干扰四种人类活动强度指标对高原鼠兔(Ochotona curzoniae)种群密度的影响。通过野外调查获取数据,并运用单因素方差分析、事后多重比较和多元线性回归等统计方法进行分析。结果显示:1)放牧强度、居民点距离和道路干扰对高原鼠兔种群密度存在显著影响,而中药材采集频次的影响不显著。2)中度至重度放牧(3~4级)区域的高原鼠兔种群密度显著高于其他放牧等级;3)居民点距离为1 km~3 km(3级)时鼠兔密度最高,而极近(<1 km,4级)和极远(>5 km,1级)距离的密度较低;道路干扰程度与鼠兔密度呈正相关,重度干扰(<100 m,3级)区域的鼠兔密度显著上升。将道路干扰、居民点距离和放牧强度纳入的多元线性回归模型能够解释高原鼠兔种群密度92.4%的变异,表明这些因素对鼠兔分布具有一定的预测能力。揭示了人类活动通过改变栖息地环境间接影响高原鼠兔的分布,为长沙贡玛国际重要湿地的生态系统保护与鼠害防控提供了科学依据。

     

    Abstract: This study quantified drivers of plateau pika (Ochotona curzoniae) population density in Sichuan Changshagongma Wetlands, an internationally significant conservation area. Using field survey and analytical method including ANOVA, post-hoc Tukey tests, and multiple linear regression (MLR), we assessed four anthropogenic factors: livestock grazing intensity, Traditional Chinese Medicine (TCM) plant harvesting frequency, proximity to human settlements, and road disturbance impacts. The results indicated that: 1) Grazing intensity, residential distance and road disturbance had significant effects on the population density of O. curzoniae, but the frequency of TCM plant harvesting had no significant effect. 2) The population density of O. curzoniae in moderate to heavy grazing (grade 3−4) was significantly higher than that in other grazing intensities. 3) The population density of O. curzoniae was the highest when the residential distance was 1 km−3 km (level 3), but the density was lower at very close (< 1 km, level 4) and very far (> 5 km, level 1) distances. There was a positive correlation between the degree of road interference and O. curzoniae density, and the O. curzoniae density in areas with severe interference (< 100 m, grade 3) increases significantly. The MLR model incorporating grazing intensity, settlement proximity, and road disturbance explained 92.4% variation of O. curzoniae population density, which showed that these factors had certain prediction ability for pika distribution. This study demonstrate that human activities indirectly affect the distribution of O. curzoniae by changing the habitat environment, which provide scientific basis for ecosystem protection and rodent control in Sichuan Changshagongma international Wetlands.

     

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