Study On The Plant Species Diversity Of Each Grade Road In Jinzhong Basin

This paper launched a series of studies with species diversity focuses on the different levels of road greenbelt in Jinzhong Basin. The cities involved in the study area are the Taiyuan City, Lvliang City and Jinzhong City. Includes six districts of Taiyuan City, yangqu County, Qingxu County, Jiaocheng County, Wenshui County, Fenyang City, Xiaoyi City, Jiexiu City, Pingyao County, Qixian County, Taigu County, Yuci District. This study involved five different levels roads, includes the highway, state roads, national highway, county roads, rural roads. In this research, the species abundance, Simpson index, Shannon-Wiener index, pielou’s index for the tree layer, shrub layer and herb layer for five different levels of road greenbelt were inverstigated.It can be seen from the results that, as the road grade decrease the plant diversity on both sides of the road showed a increasing trend. However, the general situation of the highway is rather special. Overall, as the reduction of road grade, herbaceous species diversity showed a slowly increasing trend, the species diversity of trees and shrubs showed a decreasing trend, the shrub plant community dominance showed a increasing trend, the tree layer of plant distribution uniformity getting higher and higher. The laws of some of the findings is not obvious, this may be caused by a variety of reasons, including the the construction time of various sections, the degree of interference by human activity, the different design of the greenbelt and the time to restore the vegetation. Compared with the other road, the highway has the particularity, because the green belt design more standardized, fully enclosed on both sides also makes the green belt subject to human interference less impact, which is the main reason for the law is inconsistent. Overall, on both sides of the road, trees and herbaceous species diversity is relatively stable, while the shrub distribution of differences.In this paper, through the typical quadrat investigation on the species diversity of road greenbelt in the Jinzhong Basin, use the ecological principles to explore the variation species diversity of road greenbelt.lt has important theoretical value and practical significance to the explore of species succession laws of Jinzhong Basin and to answer some key issues of artificial vegetation construction, and further guidance in the area of vegetation construction.