贵州施秉榧树群落结构与物种多样性研究

Community structure and species diversity of Torreya grandis in Shibing,Guizhou

为了解贵州榧树群落结构与物种多样性状况,以期为榧树种质资源的保护与利用提供部分依据,我们采用样方法对6个榧树群落面积为5 m×5 m样地内的物种组成、群落结构进行调查分析,结果表明:榧树在群落中可实现正常更新,表现为增长型。榧树群落中有维管植物47科68属78种,就其生活型而言,群落中木本植物41种,其中常绿树种30种。群落垂直结构可分为灌木层、乔木层和草本层,层间层则种类较少;而物种多样性指数较高的为灌木层,其次为草本层,物种均匀度指数以草本层最高,乔木层次之,也即草本层的优势度更为明显,这说明群落次生性较强。尽管榧树可以自我更新,但我们仍建议适度进行抚育以促进其幼树生长。

In order to understand the community structure and species diversity of Torreya grandis in Guizhou,and to provide basis for the protection and utilization of T.grandis germplasm resources,we used the quadrat method to analyze the species composition and community structure of T.grandis in 6 sample areas(5 m×5 m).The results showed that T.grandis showed an expanding trend in the community,and T.grandis could be renewed normally in the community.There were 78 species(68 genera,47 families)of vascular plants in the T.grandis community,among which 41 species were woody plants,including 30 species of evergreen trees.The vertical structure of the community could be divided into shrub layer,arbor layer and herb layer.The interlayer layer had fewer species.The highest species diversity index appeared in the shrub layer,followed by the herb layer.The species uniformity index was the highest in the herb layer,followed by the arbor layer.The dominance of the herb layer was obvious,which indicated that the community was secondary.Although the T.grandis community can renew itself,we still recommend that moderate tending be carried out to promote the growth of the saplings.