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本文应用主分量分析方法探讨了昆虫群落随树龄的演替规律,并把随树龄的演替划分为三个阶段。总的趋势是:害虫优势种从喜食嫩叶的种类如黑刺粉虱、卷叶蛾等向在老树上为害重的类群如矢光蚧、天牛等转化;物种数由少变多,多样性和均匀度在第一阶段较低,第二阶段最高,第三阶段又下降。主分量分析还表明了引起桔园昆虫群落演替的主要昆虫类群及它们的变动规律。也比较了管理措施对桔园昆虫群落的影响,物种数以天然防治园最多,综防园次之,化防园最少;多样性、均匀度以综防园最大,其次是化防园,天然防治园最小,但群落内昆虫个体总数正好相反,天然防治园最多,其次是化防园,综防园最少。
In this paper, principal component analysis method was used to explore the succession rule of insect community with tree age, and the succession of tree age was divided into three stages. The general tendency is that the pest dominant species are transformed from the groups that eat young leaves, such as B. tabaci and the leaf roller, And the evenness is lower in the first stage, the highest in the second stage, and the third in the decline. Principal component analysis also indicates the main insect groups that cause the succession of insect communities in the orange garden and their variation. Also compared the impact of management measures on the orange garden insect community, the largest number of natural prevention parks, the second prevention and control park, the least, and the diversity and evenness are the largest in the prevention and control park, followed by the chemical defense and prevention parks, natural The prevention and cure garden is the smallest, but the total number of insect individuals in the community is just the opposite. The natural prevention and cure garden is the largest, followed by the chemical and defense garden and the comprehensive prevention and prevention garden at least.