鄂西南百户湾针阔混交林群落结构与多样性研究

Study on Community Structure and Diversity of Mixed Coniferous and Broad-leaved in Baihuwan of Southwest Hubei

为探究封育保护后具有人工经营背景森林的群落结构和物种多样性在自然更替过程中的变化规律,以鄂西南地区的百户湾林场内0.01 km^(2)针阔混交林固定监测样地为研究对象,对木本植物的物种组成、群落结构和物种多样性进行调查与分析。结果表明,样地内胸径(diameter at breast height,DBH)≥1 cm的木本植物有8702株,隶属于39科66属111种;重要值排名前10位的物种中,常绿阔叶树种占明显优势;林冠层优势种为杉木(Cunninghamia lanceolata)和枹栎(Quercus serrata),灌木层优势种为翅柃(Eurya alata);样地内个体数量随DBH值增加而逐渐减少,小径级个体较多,平均DBH为5.2 cm;样地内物种较为丰富,各层级中亚乔木层的物种多样性最高。该研究为进一步探究森林群落结构和物种多样性的动态变化提供了科学依据。

In order to investigate the changing law of community structure and species diversity in the process of natural turnover of forests with artificial management background after closure and protection,a 0.01 km^(2) mixed coniferous and broad-leaved forest fixed monitoring sample plot in Baihuwan forest farm in southwest Hubei was used as the research object to investigate and analyze the species composition,community structure and species diversity of woody plants.The results showed that:8702 woody plants with the diameter at breast height(DBH)≥1 cm,belonging to 111 species in 66 genera of 39 families,were found in the sample site;among the top 10 species in terms of importance value,broad-leaved evergreen species dominated;the dominant species in the canopy layer were Cunninghamia lanceolata and Quercus serrata,and the dominant species in the shrub layer was Eurya alata;the number of individuals in the sample decreased gradually with increasing DBH value,and there were more individuals in the small diameter class,with an average DBH of 5.2 cm;species richness was observed in the sample site,and the highest species diversity was found in the subtree layer among the various strata.This study provided a scientific basis for further investigating the dynamic changes of forest community structure and species diversity.