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近年来,由于气候持续干旱,害鼠天敌数量减少,农田生态结构所引起的变化,有利于害鼠的发生繁殖,为害甚是猖獗,给农业生产造成一定损失。为了能正确地反映害鼠的为害情况,在开展鼠种发生分布、消长规律及综合防治措施研究的同时,对其为害农作物的空间概率结构形式及调查取样技术,作了初步测定,结果整理如下: 一、调查测定方法(一)选不同受害程度的花生田五块,根据田块大小、形状不同,每田块从田边一侧,采用目测法连续调查1300—2000墩(10
In recent years, due to the continuous drought in the climate, the number of enemy natural enemies is reduced and the changes caused by the ecological structure of farmland are conducive to the occurrence and reproduction of harmful rats. The damage is very rampant, causing some losses to agricultural production. In order to correctly reflect the damage situation of pest rats, we carried out the research on the distribution, growth and decline of rodents and the comprehensive prevention and control measures, at the same time, conducted a preliminary determination of the spatial probability structure of the pests and survey sampling techniques. The results are summarized as follows : I. Methods of investigation and determination (1) Five peanut fields with different degrees of victimization were selected. According to the size and shape of the fields,