2000～2016年石羊河北部植被覆盖度动态变化特征

Dynamic Change Characteristics of Vegetation Coverage in the Northern Basin of Shiyang River from 2000 to 2016

基于MODIS归一化植被指数产品(MOD13Q1),以石羊河流域北部盆地防沙治沙区为研究对象,统计该区域2000~2016年间植被覆盖度,并结合温度、降水数据分析研究区植被覆盖度时空变化特征。结果表明:①2000~2016年,研究区平均植被覆盖度从16.30%增长到20.79%,高盖度植被面积增加明显,劣覆盖度植被面积减少。②从不同土地利用类型来看,虽然各地类的平均植被覆盖度的变化趋势是逐渐增加,但种植土地的植被覆盖度增加速度要明显高于非种植土地。③研究区降水、气温与植被覆盖度变化相关性较低,表明研究区植被覆盖度的恢复与一些植被恢复工程的实施有关。

Based on MODIS normalized vegetation index product(MOD13Q1),taking the sand control area in northern basin of Shiyang River as the research object,we calculated the vegetation coverage of this region from 2000 to 2016. en,we used temperature and precipitation data in this region to explain the vegetation coverage dynamic changes.The results indicate that①the average vegetation coverage in the study area has increased from 16.30%to 20.79%.The area with low vegetation coverage has decreased,while the area with high vegetation coverage has increased.②From the perspective of di erent land use types,the vegetation coverage of all land use types have gradually increased.Generally,the vegetation coverage of cultivated land increased faster than natural vegetation area.③The vegetation coverage has very low correlation coefficient with temperature and precipitation in this area.Thus,the vegetation restoring projects mainly contribute to the vegetation coverage increase in this region.