草业科学2024，Vol.41Issue(6)：1441-1452,12.DOI:10.11829/j.issn.1001-0629.2022-0757
高原鼠兔种群密度与生境因子作用关系
Relationship between population density of plateau pika and environmental factors
摘要
Abstract
Plateau pika(Ochotona curzoniae)is a small mammal found on the Qinghai-Tibet Plateau.Some plateau pikas can improve alpine grassland biodiversity,improve soil structure,and help maintain ecosystem stability.However,when population density is too high,grassland degradation may occur.Exploring the factors influencing plateau pika population density can provide a theoretical basis for the scientific prevention and control of plateau pikas.Hence,elucidating the determinants influencing the population density of plateau pikas is beneficial for preventing and managing infestations of plateau rodents.In this study,the effects of 16 habitat factors on the population density of plateau pikas were investigated,including meteorology,soil,topography,vegetation,and human activities.The main modeling factors selected from the 16 habitat factors by principal component analysis and Pearson correlation analysis were annual average temperature,vegetation height,altitude,and soil hardness.The Generalized Additive Model(GAM)was used to establish the population density prediction model for the plateau pika.The results show that the model has a high degree of fit(R2=0.946).The GAM can assess the potential disaster risk of plateau pikas in the Qinghai-Tibet Plateau with a significant negative correlation between soil density and pika population density.Altitude,vegetation height,and average annual temperature had a nonlinear relationship with the population density of plateau pikas.Moreover,the population density of plateau pika reaches the maximum when the altitude is 3 800～4 000 m,vegetation height is 6～8 cm,and the average annual temperature is-2～0℃.关键词
青藏高原/植被因子/种群密度/主成分分析法/广义加性模型/土壤因子/气象因子Key words
Qinghai-Tibet Plateau/vegetation factor/population density/principal component analysis/generalized additive model/soil factor/meteorological factor引用本文复制引用
祁应莲,马有龙,张慧武,陈志..高原鼠兔种群密度与生境因子作用关系[J].草业科学,2024,41(6):1441-1452,12.基金项目
青海师范大学科研基金项目"高原鼠兔头骨的几何形态学研究"(2024QSK01) （2024QSK01）
