2000—2018年新疆植被覆盖时空变化特征及驱动力分析

Study on Driving Factors and Spatial-temporal Evolution of Vegetation Coverage in Xinjiang from 2000 to 2018

随着新疆生态环境保护工作的持续深入,近十几年来新疆植被覆盖情况发生了显著变化。为了对新疆植被覆盖变化特征进行深入研究,利用中分辨率遥感影像MODIS产品,基于像元进行植被覆盖时空变化特征研究,采用趋势分析和数理统计分析方法揭示研究区气象因子对植被覆盖变化的响应关系。结果表明:研究区低和极低植被覆盖区域约占研究区面积的74.36%,植被覆盖呈现明显的空间异质性,整体植被覆盖在波动中呈上升趋势。气象驱动力分析中,研究区当月降雨量和气温与植被覆盖变化关系在各站点存在差异,且在月尺度上存在一定的滞后性,NDVI对气温的响应强度大于降雨。

In recent years,vegetation coverage has changed significantly with the continuous deepening of ecological environment protection in Xinjiang.In this paper,the spatial-temporal evolution of vegetation coverage was studied by using medium resolution remote sensing image MODIS product and basing on pixel.The measure of Trend Analysis and mathematical statistics was used to reveal the Effect of Meteorological Factors on spatial-temporal evolution of vegetation coverage.The results show:the low and very low vegetation coverage areas accounted for about 74.36%of the study area.The vegetation coverage shows obvious spatial heterogeneity.The overall vegetation cover shows an upward trend in the fluctuation.In the analysis of meteorological driving force,there is no significant correlation between rainfall and temperature in the study area and the change of vegetation cover from station to station in that month,which has a certain lag on the monthly scale.The response intensity of NDVI to temperature is greater than that of rainfall.