南雄青嶂山常绿阔叶林优势物种组成与结构分析

基于1 hm2的固定样地数据,对粤北南雄小流坑—青嶂山保护区亚热带常绿阔叶林的物种多样性及优势植物种群的年龄、高度结构等特征进行了分析,以探讨森林群落的稳定性与演替进程.结果表明,样地中出现胸径≥1.0 cm的植物38科58属74种,个体总数1621株,建群种为木荷(Schima su-perba)和红锥(Castanopsis hystrix),重要值分别为16.56和12.00;优势种为赤皮青冈(Cyclobalanopsis gilva)、黄樟(Cinnamomum porrectum)、华润楠(Machilus chinensis)、青冈(Cyclobalanopsis glauca);群落优势科为山茶科、壳斗科、樟科、茜草科;群落整体上处于稳定阶段,其中木荷和青冈为稳定至早衰种群,红锥和赤皮青冈为基本稳定种群,华润楠为稳定种群,黄樟为衰老种群;各植物种群高度结构各具特色,其中木荷、华润楠和青冈对整个群落的高度结构影响较大.

Analysis on the composition and structure of dominant species within a evergreen broadleaved forest in Qingzhangshan, Nanxiong

Based on the data of one square hectometer permanent plot, the species diversity, age structure and height structure of dominant species populations within a evergreen broadleaved forest at Xiaoliukeng-Qingzhanshan Provincial Nature Reserve of northern Guangdong were analyzed, so as to study the stability and process of community succession. The results showed that there were 74 species belonging to 38 families and 58 genera with diameter of breast height more than 1.0 cm and the total individual number was 1 621. The constructive species were Schima superba and Castanopsis hystrix, the important values were 16.56 and 12.00, respectively. Meanwhile, the dominant species were Cyclobalanopsis gilva, Cinnamomum porrectum, Machilus chinensis, and Cyclobalanopsis glauca. The dominant families were Theaceae, Fagaceae, Lauraceae, and Rubiaceae. The community was basically of stable stage, the populations of Schima superba and Cyclobalanopsis glauca were stable to early declined stage; the populations of Castanopsis hystrix and Cyclobalanopsis gilva were basically stable stage; the Machilus chinensis population was stable stage, while the Cinnamomum porrectum population was typical declined. The height structures of each plant were various and. among all plants in the plot, Schima superba, Machilus chinensis and Cyclobalanopsis glauca made a strong impact on the height structure of the whole community.