Study On The Influence Of Wind Farm Construction On Grassland Meteorological Factors And NDVI

Based on the domestic and foreign studies on the response to climate and NDVI index changes,using the LANDSAT series of satellite remote sensing image data and the meteorological data set of the research area,the temporal and spatial characteristics of the NDVI in the Huitengxile grassland area were analyzed during the 15 years 2000-2015.At the same time,the correlation of the number of wind farm fan construction in 15 years was studied in order to find out the change trend of NDVI in the area and its correlation with climate factors.The following conclusions emerged from the analysis:(1)Through the trend analysis of multiple meteorological factors in the study area,it is found that during the fifteen years,the highest temperature in the study area shows a decreasing trend;the relative humidity factor has a decreasing trend;the monthly rainfall also has a decreasing trend;There is a significant increase in the volume.(2)The monthly NDVI index data of the study area showed a decreasing trend.The correlation analysis showed that the meteorological factors with the highest correlation with NDVI were the monthly minimum temperature,the monthly minimum temperature,the monthly precipitation and the monthly average relative humidity.All four meteorological factors have a very significant positive correlation with NDVI at 0.01 level.According to the partial correlation analysis,among the four selected meteorological factors,the monthly minimum ground temperature has the highest correlation with the NDVI index,which appeared in May,reaching 0.679,which indicates the influence of the monthly minimum ground temperature on the vegetation growth in the budding period.The largest,the lowest monthly temperature,the higher the growth of vegetation.(3)There is a clear correlation between the increase in the number of fans in the study area and the NDVI index.Correlation analysis between the number of fans and the monthly NDVI index found that the number of fans and the monthly NDVI value have a certain correlation,and the correlation with the NDVI index in June is the highest,reaching 0.122,and in May,July,The NDIV index in August and October was negatively correlated,that is,the increase in the number of wind turbines will cause the vegetation in the study area to deteriorate in May,July,August and October.(4)The study found that the fan density has little effect on the wind direction of the near surface,but the wind speed has a significant impact,especially in the July and August of the growing season,the wind speed in the area with high fan density can even be below 1m/s.