Study On Vegetation Response To Development And Operation Of Wind Farm In Huitengxile Grassland

At present, under the influence of the international macroeconomic situation, Chinese economic trends slowing growth. In order to effectively stimulate domestic demand and maintain relatively steady and rapid economic and social development, the government has increased investment in the energy sector, to support the development of renewable energy. So the wind power industry has earned a historic opportunity for development.Up to now, more than20provinces, municipalities and autonomous regions have been built different scale of wind farms throughout the country. But in a large-scale wind farm development process, various factors must be taken into account, and the necessary measures are taken to minimize the negative impact of wind farms, to achieve the sustainable development of clean energy.In this study, we take Huitengxile prairie wind farms as the research object, the basic theory of ecology as the basis, and use a combination of field surveys and "3S" technical methods, analyze the influence that development and operations of spatial scale and time scale of wind farm bring about on grassland vegetation in the study area. The results show that:(1) the process of erecting wind turbines destroy the soil surface, the thickness of surface soil (humus layer) have reduced,to erected wind machine of locations for center160square meters-250square meters range within for nude land (not counting vegetation that the process of new roads construction and buried able lines have damaged), artificial activities of wind machine late maintenance have a serious interference, resulting in that the recovery of destruction vegetation is very slow.(2) Based on2010,2012field survey data, four indicators such as abundance index, Simpson index, Shannon-wiener index, pielou evenness index are calculated and all fluctuant between different sample plots, but their variations do not vary with the amount of increase or decrease of erecting wind turbines,and the changes of the four indicators are primarily related to site conditions plots.(3) In different sample plots, there are certain differences between the biomass, and the minimum occurs onlth,2nd,3rd and4th, on the contrary, the peak appears in the7th, the9th, mainly due to the small density of wind turbines, less human interference, vegetation growing well. The differences of biomass show upward trend from east to west between different sample plots, which is inversely proportional to the number of erecting wind turbines in the study area.(4)There is a larger change of vegetation index after2000in the study area,the meadows area which vegetation index value is0.2-0.8is10,636,080m2in2000,6,092,760m2in2005, only4,116,886m2in2010. the massive expansion of wind farms affect growing of pasture vegetation since2000. The massive expansion of wind farms and artificially increased disturbance bring a greater threat to the already fragile grassland ecosystem after2000.