The Study Of Dominant Species And Community Diversity In Yunqiu Mountains (South Of Luliang Mountains)

In this paper, on the basis of field investigation, the method ofquantitative ecology was used. From the angle of species andcommunity ecology, vegetation community of the southern sectionof Luliang Mountains (Yunqiu Mountain) was studied systematic andcomprehensive, including the relationship between species ofcommunity, community structure and species diversity. Aim toanalysis the ecological relationship between plant communitiesand environment, for the vegetation restoration of degradedecosystem in the study area providing scientific theory basis andprotection. The results showed that:(1)TWINSPAN and CCA were applied on Yunqiu Mountain forvegetation community quantity classification and sorting. ByTWINSPAN classification and the actual investigation, thevegetation community in69samples was divided into10types ofassociation, and the basic characteristics of various types ofassociation were discussed. Sort of CCA and TWINSPANclassification produced consistent results. CCA sorting betterreflected the relationship of the association types andenvironmental factors. CCA first sort axis mainly reflected thechange of elevation gradient; the second shaft of CCA sort mainly reflected the changes in slope positions gradient. Results showedthat the change in elevation and slope affected the importanceecological factors of community species composition anddistribution of vegetation in the study area.(2) Through statistics diversity of families and genera in thestudy area the diversity of flora distribution, found that thegeographical composition was simple, endemic was scarce, plantof north temperate component was the main body of vegetation inthis study. At the same time, Patrick and Margalef abundance index,Simpson and Shannon Wiener diversity index and Pielou and Alataloevenness index were used to study species diversity of10associations. The differences of species diversity between theassociations were analyzed respectively from two aspects ofcommunity types and community structure. Results showed thatthe indexes could well reflect the community structure, habitatfeatures, and also could reflect the particularity of communitystructure. Richness index, evenness index, Shannon Wienerdiversity index and Simpson index were almost the same changetrend, while the different indexes represented different ecologicalmeaning but for the characteristics of community had a goodconsistency. In herb layer of10associations, Patrick and Margalefindex, Shannon Wiener index and Pielou and Alatalo index, Simpsondominance index presented herb layer> shrub layer> tree layer.Community species diversity in the study area was mainly affectedby the herb layer. Not only because the associations betweendifferent layers had individual species numbers. The number of herblayer significantly was greater than the shrub layer and tree layer. The difference of habitat conditions was also the main cause of thechange of the species diversity. The effects of Long-standing humaninterference and the tourism development in recent years tospecies diversity were also not ignored.(3) According to the theory of ecological niche and thecalculation of interspecific association at species level, the mainspecies in arbor, shrub and herb performed a negative correlationoverall and interspecific relationship was milder within the samelayer than between different layers. In the same resource utilization,overall correlation between many species in tree layer wassignificant, but the niche competition was not intense. For the shrublayer and herb layer, the overall association was not significant butniche competitive relationship was sharper than tree layer. In treelayer, shrub layer and herb layer, the interspecific relationship wasmoderater than within layers. In the shrub layer and herb layer, themain populations were in a state of a loose connection.In conclusion, the dominant species and community in YunqiuMountains was remained stablely in a dynamic balance.