HAN Xueying,YANG Guang,QIN Fucang,et al.Spatial and Temporal Dynamic Patterns of Sandy Land in Mu Us in the Last 30 Years[J].Research of Soil and Water Conservation,2019,26(05):144-150,157.
毛乌素沙地近30年沙漠化土地时空动态演变格局
- Title:
- Spatial and Temporal Dynamic Patterns of Sandy Land in Mu Us in the Last 30 Years
- 分类号:
- P941.73
- 摘要:
- 应用1990—2017年7期遥感影像作为数据源，通过计算沙漠化指数和沙漠化重心迁移等指标，对毛乌素沙地近30年沙漠化时空动态演变格局进行了研究。结果表明：（1）1990—2017年沙漠化程度处于逆转趋势，沙漠化土地面积共减少1 684.09 km2，平均62.37 km2/a的沙漠化土地得到有效的治理。（2）阶段性平均沙漠化指数1990—2000年（快速发展）为2.45，2000—2010年（快速逆转）为2.30；2010—2017年（稳定逆转）为2.01，沙漠化程度明显减轻。（3）1990—2017年，极重度沙漠化土地重心向西迁移3.42 km；重度沙漠化土地重心向西北方向迁移8.80 km；中度沙漠化土地重心向西北偏移5.42 km；轻度沙漠化土地重心向东南方向延伸9.90 km。沙漠化土地重心由西向东依次为极重度沙漠化、重度沙漠化、中度沙漠化、轻度沙漠化，在沙漠化治理与防治过程中，应根据不同沙漠化土地类型而采取不同的治理对策，做到因地制宜，合理有效地改善沙区环境。
- Abstract:
- The spatial and temporal dynamic patterns of desertification in Mu Us sandy land region in the last 30 years was studied in this research. The desertification index and the migration of desertification gravity center were calculated by 7-period remote sensing images from 1990 to 2017. The results show that:(1) desertification land area has been reduced by 1 684.09 km2 with an average of 62.37 km2/a from 1990 to 2017, which indicates that the development of desertification is in a reversal trend; (2) the average desertification indices are 2.45 (rapid development) between 1990 and 2000, 2.30 (rapid reversal) between 2000 and 2010, and 2.01 (stable reversal) between 2010 and 2017; (3) the gravity center of extremely-severe desertification land moved only 3.42 km westward; the gravity center of severe desertification land moved 8.80 km northwest; the gravity center of moderate desertification land moved 5.42 km northwest; the gravity center of mild desertification land moved 9.90 km southeast from 1990 to 2017; from west to east, the range of gravity center of desertification land in each grade is in turn extremely severe desertification, severe desertification, moderate desertification and mild desertification. In the process of desertification prevention and control, different countermeasures should be taken to effectively improve the environment of sandy area according to different land types.
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备注/Memo
收稿日期:2018-10-09;改回日期:2018-11-26。
基金项目:国家重点研发计划资助项目“乌兰布和沙漠生态园区沙产业技术和模式集成与示范”（2016YFC0501009）
作者简介:韩雪莹(1994-),女,内蒙古满洲里人,硕士研究生,主要从事荒漠化遥感监测。E-mail:1037885518@qq.com
通讯作者:杨光(1974-),男,内蒙古鄂尔多斯人,博士,硕士生导师,主要从事荒漠化遥感监测。E-mail:yg331@126.com