江南油杉人工林植物多样性与生境因子关系

为探寻江南油杉人工林林下植被生物多样性特征及生境因子对其的影响,对广西境内不同生境条件下的江南油杉人工林的植被状况进行了调查及生物多样性评价。结果表明:江南油杉人工林林下灌木层物种较草本层物种丰富,灌木层的Shanor-Wiener指数(H’)和Simpson指数(D)均明显高于草本层。草本层的Pielou指数(J)分布幅度(0.771~0.994)较灌木层的(0.841~0.945)宽。小乔木伴生树种较多,乔木种类与林地起源关系密切。不同森林郁闭度、坡度、坡向及坡位的江南油杉人工林林下植被多样性存在一定差异;随着郁闭度的上升,物种丰富度下降;阳坡灌木层植被丰富度略高于阴坡的;平坡的Shanor-Wiener指数和Simpson指数分布范围较斜坡的宽;中坡位的Shanor-Wiener指数和Simpson指数分布范围比上坡位和下坡位的低。

Study on relationship between plant diversity and habitat factor of artificial Keteleeria cyclolepis forest of Guangxi

This paper studied the vegetation condition of artificial Keteleeria cyclolepis forest of Guangxi Region in differ-ent habitats and evaluated the biological diversity with the aim of exploring the features of biological diversity of artificial K.cyclolepis forest and the influence of habitat factor.The result showed that:in artificial K.cyclolepis forest,species in shrub layer is richer than that in herb layer,both the shanor-wiener index (H')and the simpson index (D)of shrub lay-er are obviously higher than that of herb layer,but the distribution range of pielou index (J)(0.771 ~0.994)of herb layer is wider than that of shrub layer (0.841 ~0.945). Small trees have many associated species,and the variety of trees is closely related to origin of the forest land. There might be some differences in vegetation diversity among different forest canopy density,gradient,exposure,and slope position:species richness decreases with increasing canopy densi-ty;richness of shrub layer of sunny slope is higher than that of shady slope;distribution range of shanor-wiener index and simpson index on gentle slope is wider than that on steep slope;and the distribution range of shanor-wiener index and simpson index on middle slope position is narrower than that on upper and lower slope position.