汾河源头管涔山森林群落植物物种多样性研究

运用TWINSPAN和物种多样性指数,对汾河源头管涔山森林群落进行了研究。结果表明:①管涔山森林群落可划分为17个群丛,隶属于3个植被型,6个群系。②由于人为干扰的影响,旅游区内群丛的R0和H′较低;人工林群丛内,由于人工抚育,E5较高;受中等程度干扰的群丛,R0、H′和E5出现高值。③17个群丛乔木层建群种较少,优势度较高,且以寒温性针叶林为主,不同林分由于乔木层覆盖度和干扰类型的不同导致灌木层与草本层R0、H′、E5变化较大。④管涔山森林群落在海拔1 600~2 700 m呈连续分布,按R0和H′大小,17个群丛可分为3种类型,即分布于海拔2 150 m以上的群丛1~4和14R0、H′较低;海拔1 700~2 000 m的群丛7,10,12和17R0、H′偏高;其余海拔处的群丛则居中。

Plant Species Diversity of the Forestry Community in Guancen Mountain at the Source of Fen River of Shanxi

The forestry community in Guancen Mountain at the source of Fen River was studied by using Two-way Indicator Analysis(TWINSPAN) and species diversity indices.The results showed that there were 17 associations of the forestry community in this region,belonging to three kinds of vegetation type and six types of formation.R0 and H′ of the associations in tour spot are lower than the others because of the human-caused disturbance;Owing to the artificial care,the E5 is higher in the planted forest associations;R0,H′ and E5 are higher in the associations where the disturbance degree is medium.The number of constructive species of the tree layer of the 17 associations is fewer and the dominance is higher,among which the cold temperate coniferous forest is dominant.The change of R0,H′ and E5 of the shrub layer and the herb layer is significant in the different types of forest because of the different coverage of the tree layer and the different disturbance types.The distribution of the forestry community in Guancen Mountain is continuous from elevation of 1 600 m to 2 700 m.17 associations can be divided into three types based on the R0 and H′,which is as follows: The R0 and H′ of the associations 1-4 and 14 are lower above the elevation of 2 150 m;The associations 7,10,12 and 17 are higher between 1 700 m above sea-level and 2 000 m;All that remained of the associations are medium at the other elevations.