毛乌素沙地近30年沙漠化土地时空动态演变格局
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水土保持研究 Research of Soil and Water Conservation
Vol.26,No.5 Oct.,2019
毛乌素沙地近30年沙漠化土地时空动态演变格局
韩雪莹1,杨 光1,秦富仓1,贾光普1,凌 侠1,高 岗2
(1.内蒙古农业大学 沙漠治理学院,呼和浩特 010018;2.呼和浩特市林业局,呼和浩特 010020)
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1 684.09km2,平均62.37km2/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3.42km;重度沙漠化土地重心向西北方向迁移8.80km;中度 沙 漠化土地重心向西北偏移 5.42km;轻度沙漠化土地重心向东南方向延伸9.90km。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。 关 键 词 :毛 乌 素 沙 地 ;沙 漠 化 ;动 态 变 化 ;重 心 迁 移 中 图 分 类 号 :P941.73 文 献 标 识 码 :A 文 章 编 号 :1005-3409(2019)05-0144-07 DOI:10.13869/ki.rswc.2019.05.022
different countermeasures should be taken to effectively improve the environment of sandy area according to different land types. Keywords:Mu Us sandy land;desertification;dynamic change;gravity center migration
Spatial and Temporal Dynamic Patterns of Sandy Land in Mu Us in the Last 30Years
ቤተ መጻሕፍቲ ባይዱ
HAN Xueying1,YANG Guang1,QIN Fucang1,JIA Guangpu1,LING Xia1,GAO Gang2
(1.College of Desert Control Science and Engineering,Inner Mongolia Agricultural University, Hohhot 0.0018,China;2.Hohhot Forest Bureau,Hohhot 010020,China)
Abstract:The spatial and temporal dynamic patterns of desertification in Mu Us sandy land region in the last 30years was studied in this research.The desertification index and the migration of desertification gravity center were calculated by 7-period remote sensing images from 1990to 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 1990to 2017,which indicates that the development of desertification is in a reversal trend;(2)the average desertification indices are 2.45 (rapid development)between 1990and 2000,2.30 (rapid reversal)between 2000and 2010,and 2.01 (stable reversal)between 2010and 2017;(3)the gravity center of extremely-severe desertification land moved only 3.42km westward;the gravity center of severe desertification land moved 8.80km northwest; the gravity center of moderate desertification land moved 5.42 km northwest;the gravity center of mild desertification land moved 9.90km southeast from 1990to 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,