皖南山区北缘主要常绿林群落的生物量及生产力

Forest biomass and productivity of main evergreen communities in Anhui Xiaokeng

选择安徽亚热带地区的肖坑小流域，对该地实施封山育林后植被恢复的情况、生产力水平作了初步评价。其中，甜槠群落的平均生物量为120．165t／hm^2，苦槠群落的为96．168t／hm^2，青冈群落的为72．73t／hm^2，绵槠群落的为80．416t／hm^2。上述群落中生物量在不同径阶的分配呈正态分布，且主要集中在胸径12～24cm的树木中。群体的主干生物量均随树木高度的增加而逐渐减小，并且地上部分生物量在2～8m处较高。主要群落生物量的动杰分析嘉明．该妯械俞女彰寿20～50a.

Xiaokeng small basin, which located in the subtropical zone of Anhui, was selected as the study area. We made a primary assessment on vegetation recovery and productivity level of forest since it has been protected. Castanopsis eyrei, Castanopsis sclerophylla, Cyclobalanopsis glauca and Lithocarpus harlandii were appraised. The average community biomass of the above 4 species was 120. 165, 96. 168, 72.73 and 80. 416 t/hm^2 respectively. In the above communi- ties, the biomass distribution of different DBH class followed normal distribution, and trees with DBH between 12--24 cm were most abundant. It was well known that trunk biomass decrease with increase in height. The aboveground vertical biomass accumulated in the vertical zone between 2--8 m, which was more than that of both above and below. The biomass dynamic analysis of the major community types showed that the forest stands in this area were 20--50 years old.