2012—2018年忻州市生长季NDVI时空变化及影响因素分析

Analysis of spatial and temporal variations of NDVI in the growing season during 2012-2018 in Xinzhou

基于中分辨率遥感数据MODIS-NDVI数据集及同期温度和降水数据,采用皮尔逊相关系数法、趋势变化法研究忻州市2012—2018年(5—9月)生长季的NDVI与气象因子的相关性,及植被覆盖变化趋势。结果表明:1)忻州市西部植被与降水相关性较高,草地受降水影响较大,耕地、林地次之;2)忻州市植被与温度呈较高相关性的区域主要集中在宁武县、五台县,林地受温度影响较大;3)在研究期间忻州市整体的植被覆盖呈增长趋势,城市化建设是忻州市部分区域植被退化的主要因素。

Based on the MODIS-NDVI dataset of medium-resolution remote sensing data and temperature and precipitation data of the same period,the correlation between NDVI and meteorological factors during the growing season of May-September from 2012 to 2018 in Xinzhou City,as well as the trend of vegetation cover were investigated by using both Pearson's correlation coefficient method and the trend change method.The results showed that:1)The correlation between vegetation and precipitation was higher in the west of Xinzhou City,and grassland was more affected by precipitation,followed by cropland and woodland.2)The areas with high correlation between vegetation and temperature in Xinzhou City were mainly concentrated in Ningwu and Wutai counties,and woodland was more affected by temperature.3)The overall vegetation cover in Xinzhou City showed an increasing trend during the study period and urbanization was the main factor for vegetation degradation in the same areas of Xinzhou City.