基于MODIS数据2001—2019年NDVI时空变化及驱动力分析——以阿克苏地区为例

植被作为生态系统中的重要因素之一,深入了解植被覆盖的变化与驱动力因素,以期为生态环境保护提供重要参考。以阿克苏地区为研究区域,基于2001—2019年长时间序列的MODIS数据的NDVI变化特征进行了分析,通过利用线性回归分析与相关分析2种方法对植被和气候间的关系进行分析。结果表明：2001—2019年阿克苏地区植被覆盖总体呈现出增加的趋势且在生长季的夏季最为明显,研究区在空间上呈现出以绿洲为主向周围扩散的格局,研究区生长季NDVI对气温和降水的响应关系表现出显著的季节差异,并在空间上与温度具有显著相关性但同降水相关性不明显。人类的生产生活对植被覆盖度的变化影响有正负两个方面。

Analysis of Spatial-temporal Changes and Driving Forces of NDVI from 2001 to 2019 Based on MODIS Data:Taking Aksu as an Example

Vegetation is one of the important factors in the ecosystem. An in-depth understanding of the changes and driving factors of vegetation cover could provide important reference for ecological environmental protection. Taking Aksu as the research area, the NDVI variation characteristics from 2001 to 2019 were analyzed based on the long-term series of MODIS data. The relationship between vegetation and climate was explored by using two methods: linear regression analysis and correlation analysis. The results showed that: from 2001 to 2019, the vegetation cover in Aksu showed an overall increasing trend and the trend was most obvious in summer which was the growing season. The vegetation cover of the study area showed a pattern of spreading mainly from oasis to the surrounding areas. The NDVI response to temperature and precipitation in the growing season showed significant seasonal differences, and had an extremely significant correlation with temperature but not obvious correlation with precipitation. The impact of human production and life on the change of vegetation cover had both positive and negative aspects.