摘要
本文研究了鼎湖山自然保护区,亚热带季风常绿阔叶林和针叶阔叶混交林的光能利用效率。根据群落的垂直结构和成层现象,应用红外线CO_2气体分析法,分层测定了主要植物22种58株的光合速率.计算了群落的生产力;用量子传感器分层测定了两个群落的光合有效辐射,并计算其光能利用效率。结果表明:阔叶林总生产力的光能利用效率为14.28%,混交林为12.01%,说明了不同森林类型对光能资源的利用效率。
In this paper, the radiation absonption efficiency of the photosynthesis of the subtropical monsoonal broad-leaved evergreen forest (Castanopsis chinensis+Schima superba+Cryptocarya chinensis community) and the needle broad-leaved mixed forest (Pinus massoniana+Schima superba+Castanopsis chinensis+Craibiodendron kwangtungense community) in the Dinghushan mountain were described. The photosynthetic rates of 58 individuals of 22 main species at different layers of community were measured with an infrared CO_2 analyzer. The leaf area index of community were measured by the method of dripping tag, and the vertical distributions of the photosynthetically active radiation were measured by the level moving quantum sensor in two forests.The results showed that the radiation absonption efficiency of the photosynthesis a for the gross primary productivity was 14.28% and 12.01% in the monsoonal broad-leaved evergreen forest and the needle broad-leaved mixed forest, respectively. Therefore, the photosynthesis efficiency of the monsoonal broad-leaved evergreen forest is higher than that of the needle and broad-leaved mixed forest.
关键词
森林群落
光能利用率
鼎湖山
Dinhushan mountain
Gross primary productivity
photosynthesis efficiency
Forest community
