新疆土地荒漠化时空变化特征分析

Spatial-temporal variation of land desertification in Xinjiang

针对利用遥感数据进行土地荒漠化分析研究的角度单一问题,该文提出一种从土地生产力和植被长势两个角度进行土地荒漠化时空变化分析的方法。通过研究新疆2000—2012年4—10月期间的植被降水利用率和植被覆盖度的时空变化特征综合反映新疆土地荒漠化的演变情况。研究结果表明,新疆土地生产力较好、植被退化的区域约占新疆国土面积的9.32%,土地生产力较差、植被退化的区域约占0.02%,土地生产力较差、植被恢复的区域约占1.37%;土地生产力正常、植被恢复的区域约占89.29%;在植被生长的不同时期,降水量对土地荒漠化的正面抑制作用呈现增强、不变或减弱的特征。研究结果,可为土地荒漠化评价方法的研究提供理论参考。

According to the problem that the perspective of land desertification analysis and research using remote sensing data is single,the paper puts forward a new method of the spatial-temporal variation analysis of desertification from land productivity and vegetation growth.The paper synthetically reflects the evolution of land desertification in Xinjiang for 13 abetween April and October by researching the spatial-temporal variations of RUE and FVC in Xinjiang for 13 a.The results show that the ratio of the better land productivity and vegetation degeneration areas in Xinjiang is 9.32%.The ratio of the poor land productivity and vegetation degeneration areas in Xinjiang is 1.37%;The ratio of the normal land productivity and vegetation revegetation areas in Xinjiang is 89.29%.In the different periods of vegetation growth,the positive inhibition of precipitation on land desertification shows the characteristics of increasing,unchanged or declining.The research results can provide a theoretical reference value for the evaluation method of land desertification.