【摘要】 在分析洞庭湖区东方田鼠暴发成灾乡及灾情的基础上，研究了洞庭湖区洲滩演变对东方田鼠暴发成灾的影响。研究认为，中低位洲滩出露出积不断增大使东方田鼠种群迅速膨胀，高位洲滩出露面积减小造成汛期东方田鼠大量向垸内农田迁移；湖区洲滩冬春季连续出露天数增加延长了东方田鼠的繁殖期；汛期洪峰水位增高、洲滩大面积淹没迫使东方田鼠大量迁向垸内；湖内废弃湖堤为东方田鼠逃避洪水提供了中途休养之地；洲滩地抑制东方田鼠种群膨胀的天敌数量已大大减少。据此，本文指出，三峡工程建成后将对洞庭湖区训滩演变产生重大影响，因而将改变东方田鼠种群生态环境条件，引起种群动态变化，值得注意。更多还原

【Abstract】 On the basis of the analysis on the Yangtze vole’s disaster history and condition inDongting Lake area, the influence of the lake beach’s environmental evolution on the vole dis-aster is studicd in this paper. The rise of low-middle-level beach area causes the vole’spopulation explosion, the reduction of high-level beach area forces the voles into the farmlandduring the flood season, and the emergence period’s continual increase extends the vole’shabitat areas and forces them to migrate into the fandand. The discarded dike provides a restplace halfway for the voles, which escape the flood, and the natural enemies of the voles,which are a natural barrier against the vole’s popu1ation expansion, decreases. According tothis study. the conclusions are put foroward as followsf after Three-gorge Project’sconstruction it will produce great influences on the beach evolution in Dongting Lake area,leading to the changes of the vole’s ecological environment situation and resulting in thevole’s population changes which deserves attention.更多还原