Influence of agricultural productive structure and countermeasures on the rodent population density of the farmland in Dongting Lake area
洞庭湖区农业生产格局及措施 对农田害鼠种群数量的影响研究

The influence of agricultural productive structure and countermeasures on the rodent population density of the farmlands in Dongting Lake area is stud ied.The results show that the population density of rodent in paddy field is hig her than that in cotton land;and its population density in harvested paddy field is higher than that in rape land in the first month of winter,but the populatio n density of rodent in rape land is higher than that in harvested paddy field in the beginning of spring;the population density of rodent in the non- phenol cott on field is higher than that in the phenol cotton field,the population density o f rodent in the field with hardened ridge is lower than that in the field with u nhardened ridge.The agricultural productive activities,i.e.the early rice seedin g,seeding and harvesting in time,the later rice harvesting,may cause the migrati o n of rodents owing to the change of the habitats,while the influence on rodent p opulation density is restricted by it propagating characteristics,so the populat ion density of rodent is not affected markedly by the main agricultural producti ve activities in the farmland.