辉腾锡勒草原风电场建设对NDVI时空及气象因子的响应

RESPONSE OF THE CONSTRUCTION OF HUITENGXILE GRASSLAND WIND FARM TO NDVI SPACE-TIME AND METEOROLOGICAL FACTORS

基于MODIS-NDVI数据与同期的气象数据,运用趋势分析、相关分析、偏相关分析等方法,对辉腾锡勒草原地区15 a间植被时空变化特征进行研究。并从降水量、相对湿度和蒸发量3个气象要素分析了NDVI对气象因子的响应,以及研究区风电场建设对气候变化的影响。研究表明:①2001年-2015年辉腾锡勒草原地区NDVI整体呈增长的趋势,但是在风机快速建设的阶段,NDVI显著下降;②研究期间内,降水量、相对湿度均呈下降趋势,蒸发量呈增长趋势,研究区气候整体有干旱的趋势;③研究区NDVI与降水量、相对湿度均具有0.01水平上显著的正相关关系,NDVI与相对湿度的偏相关系数达0.706;④研究区蒸发量与风机数量呈正相关(r=0.578,p<0.05),这表明风机数量的增长导致蒸发量显著增加。

Based on the MODIS-NDVI data and the meteorological data of the same period,the temporal and spatial characteristics of vegetation in the Huitengxile grassland area were studied by trend analysis,correlation analysis and partial correlation analysis.The NDVI response to meteorological factors and the impact of wind farm construction on climate change in the study area were analyzed from three meteorological elements:precipitation,relative humidity and small evaporation.The research shows that:①The overall ND-VI of Huitengxile grassland in 2001—2015 is increasing,but NDVI is significantly decreased during the rapid construction of wind turbines;②Precipitation and relative humidity are decreasing during the study period.The evaporation showed an increasing trend,and the overall climate of the study area showed a trend of drought.③The NDVI of the study area had a significant positive correlation with precipitation and relative humidity at 0.01 level,and the partial correlation coefficient between NDVI and relative humidity reached 0.706.④The small amount of evaporation in the study area was positively correlated with the number of fans(r=0.578,p<0.05),indicating that the increase in the number of fans resulted in a significant increase in near-surface evaporation.