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利用2000~2013年间生长季(4~10月)MODIS NDVI数据和同期降水量和气温数据,对中国北方农牧交错区植被覆盖时空变化进行了分析。从时间推移看,农牧交错区年平均NDVI总体上呈增长趋势,其变化趋势主要受降水控制,与降水量的相关系数达到0.886;从空间分布看,农牧交错区呈增加趋势的面积远大于呈减小趋势的面积;从各省、自治区农牧交错区植被覆盖变化看,甘肃、宁夏、陕西、山西和辽宁年平均NDVI增速明显,其它省份增速比较平缓,其气候影响因地区而异。
The temporal and spatial variations of vegetation cover in the ecotone between agriculture and animal husbandry in northern China were analyzed using MODIS NDVI data and precipitation and temperature data during the growing season from April to October from 2000 to 2013. From the perspective of time, the annual average NDVI in the ecotone between agriculture and animal husbandry is generally increasing. The change trend is mainly controlled by precipitation, and the correlation coefficient with precipitation is 0.886. From the perspective of spatial distribution, the area with increasing trend in ecotone From the change of vegetation cover in the ecotone of agriculture and animal husbandry in the provinces and autonomous regions, the annual average NDVI of Gansu, Ningxia, Shaanxi, Shanxi and Liaoning shows a significant growth rate while the growth rate of other provinces is relatively slow. The climatic impact is affected by the region different.