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对青铜峡市树新林场杨树纯林、果园和杨槐混交林等三类人工林昆虫种群和稳定性调查,发现种群种类和数量呈混交林>纯林>果园趋势;其稳定程度经多重比较的q检验法测定,得D值混交林>果园>纯林。本测定中果园的D值所以大于纯林,受果园四周设有多种树种的防护林,园内施粪肥招引昆虫及调查期正值果园开花,蜜源昆虫增多等因素影响。
The investigation on insect population and stability of three types of plantations, such as pure poplar grove, orchard and poplar mixed forest in Shuxin Forest Farm of Qingtongxia City, found that the population types and quantity showed the trend of mixed forest> pure forest> orchard; q test determination, D value mixed forest> orchard> pure forest. In this test, the value of D in the orchard is larger than that in the pure forest, and there are many kinds of shelterbelts around the orchard. Manure is attracted to attract insects in the park and the survey period is affected by the orchard flowering and the increase of nectar insects.