黑石顶自然保护区南亚热带常绿阔叶林生物量与生产量研究Ⅴ.昆虫食叶量

Biomass and productivity of southern evergreen broad-leaved forest in Heishiding Natural Reserve V. Herbivory

1 引言 森林的昆虫食叶量是森林第二性生产的主要途径之一,对了解森林生态系统的第二性生产及物质循环都有很大意义,对森林虫害的防治也有积极意义,目前国内外对这方面的研究尚不多,对昆虫的食叶量、采食的特点及规律知道的很少。因此,深入进行这方面的工作很有必要。

Annual herbivory and its monthly variation in southern subtropical evergreen broad-leaved forest in Heishiding Natural Reserve are studied. The annual herbivory is 0.217 t·ha^(-1), i.e., 1 6.98％ of leaf biomass or 7.03％ of leaf area. About half of the foliage is more or less grazed. The consumed leaf is about 15％ of leaf grazed. Monthly variation of the herbivory shows that higher consuption percentage occurred from August to November(December), and lower one, from March to June. Different species of leaves show different sensitivity to herbivory. Small, harder and hairy leaves are less grazed, but thinner ones are generally consumed. Insects have some specificity to consume leaves.