基于RS和GIS的玛曲高原土地沙漠化时空演变研究

发布时间：2018-07-31 20:24

【摘要】：基于RS和GIS空间分析技术,以玛曲高原多期Landsat遥感数据为主要信息源,监测分析了1977—2014年玛曲高原沙漠化土地的时空演变规律。结果表明:近40年来玛曲高原的土地沙漠化经历了迅速发展—缓慢发展—急速逆转—缓慢逆转—快速逆转的变化过程。1977—1995年玛曲高原沙漠化处于快速扩张阶段,年均扩张速率为3.01%;1995—2014年沙漠化扩张趋势出现逆转,年均逆转速率为4.14%。沙漠化土地的发展和逆转区域主要分布在东北部欧拉秀玛乡和尼玛乡黄河沿岸、东南部采日玛乡和曼日玛乡沼泽区、西南部齐哈玛乡和中部阿万仓乡黄河支流两岸。玛曲高原沙漠化土地的发展和逆转过程并非逐级递增或递减,而是在15—20年内交替出现,不同等级沙漠化土地之间的转移也存在明显的跃变。从整体来看,玛曲高原土地沙漠化呈现逆转趋势,区域生态环境得到明显改善。
[Abstract]:Based on the RS and GIS spatial analysis techniques, the spatio-temporal evolution of the desertification land in the Maqu plateau from 1977 to 2014 is monitored and analyzed with the multi period Landsat remote sensing data of the Maqu plateau. The results show that the desertification of the Maqu plateau in the last 40 years has experienced a rapid development, a slow development, a rapid reversal, a slow reversal and a rapid reversal. The change process of the reverse is.1977 - 1995, the desertification of Maqu plateau is in the rapid expansion stage, the annual average expansion rate is 3.01%, the trend of desertification expansion in 1995 - 2014 is reversed, and the annual reverse rate is 4.14%. desertification land development and reverse region mainly distributed in the northeast of the eulasiu and Ni Ma Township and the southeast. The development and reversal process of the desertification land in the Maqu plateau is not gradually increasing or decreasing, but in 15 to 20 years, and the transition between different grades of desertification land is obviously leaped. From the overall point of view, Maqu, Maqu Desertification in plateau area shows a reverse trend, and the regional ecological environment has been significantly improved.
【作者单位】：西北师范大学地理与环境科学学院;
【基金】：国家自然科学基金项目(41161036,41171018) 甘肃省自然科学基金项目(1010RJZA016) 西北师范大学青年教师科研能力提升计划(NWNU-LKON-10-34)
【分类号】：X171.1;X87;P208

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