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利用2000至2006年的MODIS-NDVI影像数据,通过年最大NDVI随时间的变化斜率和对变化趋势的分区统计、重心分析及空间自相关分析,探索近年来吉林省植被的时空变化规律。吉林省大多数区域NDVI呈现出稳定或增加趋势,反映出吉林省植被生态系统有所恢复。植被变化趋势具有明显的空间分异特征,东部主要为稳定型,西部主要为增长型,局部区域有衰退迹象,主要分布在吉林省东南角和西南角、长春市市辖区及沿河沿湖地区。空间自相关分析表明,植被变化过程在研究区域内具有较强的空间正相关,即变化趋势在空间上具有趋同性,集聚现象明显。
Based on MODIS-NDVI image data from 2000 to 2006, spatial and temporal variations of vegetation in Jilin Province in recent years were explored through the slope of change of the maximum NDVI over time, the zoning statistics of the trend, the analysis of the center of gravity and the spatial autocorrelation analysis. NDVI in most areas of Jilin Province showed a steady or increasing trend, reflecting the restoration of vegetation ecosystems in Jilin Province. The trend of vegetation change has obvious spatial differentiation characteristics. The eastern part is mainly of stable type, the western part is mainly of growth type, while the local parts have signs of recession. They are mainly distributed in the southeast corner and southwest corner of Jilin Province, Changchun City and the riverside lakeside area . Spatial autocorrelation analysis showed that the process of vegetation change had a strong spatial correlation in the study area. That is to say, the trend of change was similar in space and the phenomenon of agglomeration was obvious.