Analysis Of Plant Community Characteristics Of Different Sowing Period In HunShanDake Sand

In this study, the plant community which was seeded in HunShanDake sand during different years was investigated by sampling method. Deals of general indexes were used to analyze the characteristics of plant community, such as species composition, Margalef index, Shannon-Wiener index, Pielou index, Simpson index, vegetation coverage and aboveground biomass. The conclusions are as the following.(1) The species composition of plant community has obvious changes in different years. It was for5years that species richness has reached21species. Compared with the6kinds of species in mobile dunes, species richness of plant community increased significantly. At the same time, plant families and genus became complicated, and species dominance of plant community changed significantly.(2) On the structure of community life, as the extension of the sowing, dominant position of annuals was gradually reduced, and the dominance of perennial plants increased.(3) Vegetation coverage increased with increasing years, the vegetation coverage was increased by2.06%(without treatment) to75.58%(governance of five years old), and sand was gradually stable.(4) Aboveground biomass (fresh weight) increased with increasing years, aboveground biomass was increased by9.8g·m-2(without treatment) to1711.0g·m-2(governance of five years old).(5) Community species richness index, diversity index and evenness index were gradually increased along with the extension length of it, and ecological dominance index was the opposite trend. And the species diversity index and evenness index and richness index have a significantly positive correlation.(6) Species diversity index and aboveground biomass (fresh weight) was significant fitting relationship in the process of vegetation restoration, and the ground biomass increased as increasing species diversity.