局部环境增温对根田鼠冬季种群的影响  

Effects of Locally Environmental Warming on Root Vole Population in Winter

作　　者：孙平[1] 魏万红[1] 赵亚军[2] 徐世晓[1] 赵同标[1] 赵新全[1] 

机构地区：[1]中国科学院西北高原生物研究所 [2]中国农业大学设施农业生物环境工程农业部重点开放实验室,北京100083

出　　处：《兽类学报》2005年第3期261-268,共8页Acta Theriologica Sinica

基　　金：国家自然科学基金资助项目(30100016);中科院海北高寒草甸生态系统定位站基金资助项目

摘　　要：通过建立开顶式增温小室模拟全球变暖的实验,对海北高寒草甸地区实验增温样地及其对照样地内根田鼠的冬季种群进行调查,旨在研究局部增温对根田鼠冬季种群的可能影响。结果表明,在冬季,实验增温草甸样地和灌丛样地内根田鼠的种群密度均显著高于其对照(P<0.05);实验增温灌丛样地与对照间性比的差异不显著(P>0.05);增温样地和对照之间、不同植被类型的增温样地之间、对照样地之间,根田鼠留存率、平均体重及年龄结构的差异均不显著(P>0.05);有从对照样地向增温样地单方向迁移的记录。总之,局部环境增温导致实验样地内根田鼠的冬季种群密度明显上升,而其性比、存活率、种群平均体重以及年龄结构无明显变化;在冬季,根田鼠有从对照样地向增温样地扩散或迁移的趋势。To study possible effects of local warming on root vole （ Microtus oeconomus ） populations during winter, we compared populations of root voles in experimentally-warmed sites （using open top chambers, TOCs） and control sites Experimental sites included experimentally-warmed meadow （EWM）, control meadow （CM）, experimentally-warmed shrub （EWS）, and control shrub（CS）. Population densities on EWM and EWS were significantly higher than their respective controls （CK and CS）. We found no significant difference in the sex ratio between EWS and CS （P 〉 0.05）. We found no significant differences （P 〉 0.05） for any experimental pairwise comparisons of apparent subsistence rate, mean body mass, or population age structure. We documented individual root voles that had dispersed or migrated from controls to locally-wanned sites. Our results suggest that although local environmental wanning produced a significant inerease of winter root vole population densities, it had little effect on sex ratio, survival rate, average body nass or population age structure. We suspect that root voles dispersed or migrated from control areas tolocally-warmed sites.

关 键 词：根田鼠 冬季 种群特征 开顶式增温小室 局部环境增温 全球变暖 

分 类 号：Q958.1[生物学—动物学]