Studied On Diversity Of Vascular Plants, Forest Communities And Plant Resources In Hilly-mountainous Areas Of Changzhou

Based on the plant species and the main plant communities as the research object in Hilly-mountainous areas of Changzhou, the flora of vascular plants and biodiversity connectivity of hilly mountains in south Jiangsu, forest communities structure, species diversity and plant resources were studied by the method of combining the filed investigation and analysis inside in this parper. The main results are as follows:1. There were774species vascular plants belonging to445genera and131families in hilly-mountainous areas of Changzhou, including34species pteridophytes in23genera of16families,6species gymnospermaes in6genera of4families,595species dicotyledons in338genera of97families and139species monocotyledoneaes in78genera of14families. There were14species dicotyledons in12genera of10families belonging to Jiangsu province new records. The dominant families were as follows:Grarmineae, Compositae, Leguminosae, Rosacea, Labiatae, Fagaceae, Polygonaceae, Dryopteris, Polypodiaceae, Thelypteridacea; the dominant genera were as follows:Rubus, Artemisia, Lindera, Loropetalum, Lysimachia, Dryopteris, etc. The vascular plants flora were composed mainly of small genera and small families with1-4species, respectively accounted for94.83%of the total genera and65.65%of the total families, the floristic species differentiation degree wasn’t high.The floristic geographical elements was compliced in hilly-mountainous areas of Changzhou, the proportion of tropical elements slightly reduced, while the proportion of temperate elements increased significantly from family to genus, shows transitional characteristics from tropic to subtropic and temperate. It characterized with ancient origin to some extent and the peculiar elements were poor.2. Through the comparision of biodiversity connectivity of hilly mountains in south Jiangsu, we concluded:All of Mt. Qionglong Forest Park, Mt. Longchi Reserve and Shenxika were important nodes. Because the biodiversity capacity of Shenxika was behind Mt. Longchi Reserve, it seemeded that Shenxika was the key area of biodiversity in Jiangsu, we suggested to establish a nature reserve of forest-ecology system and focused on protecting Phoebe sheareri community, and the rare plants such as Pseudolarix amabilis, Pteroceltis tatarinowii, Ardisia crenata. The results of Jaccard index and Czekanowski index showed that:The similarity of vascular plants was decreased from family to genus and then species in three areas, their connectivity was strong and difference was obvious. Beta diversity index revealed that the loss of biodiversity information problem among those areas. Therefore, the plant biodiversity protection should be strengthened between Mt. Qionglong Forest Park and Mt. Longchi Reserve, especially in Mt. Qionglong Forest Park; It’s best to creat a new reserve in Shenxika or between Shenxika and Mt. Longchi Reserve, that will benefit the migration and diffusion of species to improve the level of the paint diversity in south of Jiangsu, as well as by constructing ecological corridors.3. The vegetation was divided into evergreen broad-leaved forest, evergreen and deciduous broad-leaved forest, deciduous broad-leaved forest, coniferous forest bamboo forest and Shrubland, which include14communites in hilly-mountainous areas of Changzhou. The vertical structure of plant communities was clear and tree layer generally can be divided into the layer. From all levels within the species composition, the numbers of Zelkova schneideriana were very few or miss in the shrub layer and layer of seedling and sapling, while holds significant advantages in the tree layer, its natural regeneration more difficult. Species diversity indexes research showed that larger difference in levels and types, the zonal vegetation of evergreen and deciduous broad-leaved forest has higher diversity, evergreen broad-leaved forest be placed in the middle, and lowest diversity in bamboo forest, Similarity index of species composition ranges from0.15to0.60in all forest communities.4. There were760species of wild plant resources in hilly-mountainous areas of Changzhou, according to the economic use, they could be classified into nine kinds: medicinal plants, edible plants, ornamental plants, wood plants, pesticide plants, environmental protection plants, rare and endangered plants, etc. Medicinal plants, ornamental plants, ornamental plants, rare and endangered plants are important resources among them.