沅陵3种天然次生林群落乔木层物种多样性研究

摘要

Based on plant communities and plots investigation in 3 kinds of natural secondary forests (Sassafras tswnu + Castanea henryi community, Liquidambar formosana + Sassafras tsumu community, Cunninghamia lanceolata+ Sassafras tsumu community ) in Yuanling county Hunan province, indices of Margalef species richness index, Simpson index, Shannon-Wiener index, Pielou evenness index, and ecological dominance index of the plots were calculated by using typical quadrat sampling methods. The results show that : (1) there were 20 species belonging to 11 families 19 genera in Sassafras tsumu + Castanea henryi community, 13 species belonging to 9 families 11 genera in Liquidambar formosana + Sassafras tsumu community, 18 species belonging to 12 families 18 genera in Cunninghamia lanceolata + Sassafras tsumu community. ( 2) the diversity of Sassafras tsumu + Castanea henryi community was higher than that of Liquidambar formosana + Sassafras tsumu community, and Cunninghamia lanceolata + Sassafras tsumu community. (3) Ecological advantages in Cunninghamia lanceolata + Sassafras tsumu community was above Liquidambar formosana + Sassafras tsumu community and Sassafras tsumu + Castanea henryi community. The results could provide a scientific basis for protection and management natural secondary forests.%采用典型样方法,分别计算各样地的物种丰富度指数、Shannon-Wiener指数、Pielou均匀度指数和生态优势度指数,对湖南沅陵3种天然次生林群落(檫木+锥栗群落、枫香+檫木群落、杉木+檫木群落)乔木层物种多样性进行了研究.结果表明:(1)檫木+锥栗群落乔木层出现植物20种,隶属于11科19属,枫香+檫木群落出现13种,隶属于9科和11属,杉木+檫木群落出现植物18种,隶属12科18属.(2)檫木+锥栗群落多样性程度高于枫香+檫木群落和杉木+檫木群落.(3)杉木+檫木群落生态优势度高于枫香+檫木群落和檫木+锥栗群落.研究结果可为天然次生林防护和管理提供科学依据.