浙江千岛湖地区苦槠叶片昆虫取食状类型和取食强度研究

选择千岛湖地区不同大小岛屿为样地,对苦槠(Castanopsis sclerophylla)叶片虫食状类型和取食强度进行了研究.结果表明,千岛湖地区苦槠叶片昆虫取食状类型为16种,但取食频率不同.取食频率和取食部位对叶片危害程度的分析结果显示,缘食状、掏食状、顶食状、阴面食状和叶中脉状对植物叶片的影响更大.16种取食状中,缘食状和顶食状、缘食状和阴面食状之间呈极显著正相关(P＜0.01),缘食状与大孔状、顶食状与大孔状、顶食状与掏食状、阳面食状与阴面食状之间呈显著正相关(P＜0.05).苦槠叶片被昆虫取食的频率为84%,但绝大多数受害程度低.

Intensity and Patterns of Castanopsis sclerophylla Leaf Eaten by Insects, at Qiandao Lake, Zhejiang

A huge variety of Phytophagous insects live on Castanopsis sclerophylla leaves.In order to study relationship between insects and plants in island habitats,a survey was carried out of intensity and patterns of Castanopsis sclerophylla leaf eating by insects on several isles in the Qiandao Lake,Zhejiang Province.A total of 16 leaf-eating patterns were identified,varying in frequency.In terms of frequency and damage of leaves,edge defoliation,excavating defoliation,top defoliation,lower epidermis defoliation and middle vein defoliation were the most important types damaging leaves of Castanopsis sclerophylla.Results of correlation analysis show that among the 16 patterns significant positive correlations were found between six pairs.About 84% of the Castanopsis sclerophylla leaves were damaged as a result of leaf-eating by insects,but the damage mostly was not serious.