Land use and land cover change and its driving forces in Maqu County, China in the past 25 years
Land use and land cover change and its driving forces in Maqu County, China in the past 25 years作者机构：Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences State Key Laboratory of Grassland Agroecosystems School of Life Sciences Lanzhou University
出 版 物：《Research in Cold and Arid Regions》 (寒旱区科学（英文版）)
年 卷 期：2016年第8卷第5期
页 面：432-440页
核心收录：
学科分类：08[工学] 09[农学] 0903[农学-农业资源与环境] 083306[工学-城乡规划管理] 0833[工学-城乡规划学] 0834[工学-风景园林学（可授工学、农学学位）]
基 金：the funding received from the Natural Science Foundation of China (41301003, 41371026, and 31470480) the Technology of the People's Republic of China (No. 2013CB956000)
主 题：LUCC driving forces Maqu County source region of the Yellow River
摘 要：Maqu County is located in the northeast Qinghai-Tibetan Plateau, and it is the main watershed for the Yellow River. The ecosystem there is extremely vulnerable and sensitive to climate change and human activities, which have caused significant deterioration of the eco-environment in this region. In order to restore the ecological environment, a government project to restore the grazing areas to grassland was implemented in Maqu County in early 2004. This study evaluates the effects of that restoration project on land use and land cover change （LUCC）, and explores the driving forces of LUCC in Maqu County. In the study we used Landsat images obtained in 1989, 2004, 2009, and 2014 to establish databases of land use and land cover. Then we derived LUCC information by overlaying these layers using GIS software. Finally, we analyzed the main forces responsible for LUCC. The results showed that forests, high-coverage grasslands, and marshes experienced the most significant decreases during 1989–2004, by 882.8 ha, 35,250.4 ha, and 2,753.4 ha, respectively. However, moderate- and low-coverage grasslands and sand lands showed the opposite trend, increasing by 12,529.7 ha, 25,491.0 ha, and 577.5 ha, respectively. LUCC in 2004–2009 showed that ecological degradation slowed compared with 1989？2004. During 2009–2014, high- and moderate-coverage grasslands increased obviously, but low-coverage grasslands, marshes, unused lands, sand lands, and water areas showed the opposite trend. These results suggested that the degradation of the eco-environment was obvious before 2009, showing a decrease in the forests, grasslands, and water areas, and an increase in unused lands. The ecological degradation was reversed after 2009, as was mainly evidenced by increases in high- and mod-erate-coverage grasslands, and the shrinkage rate of marshes decreased obviously. These results showed that the project of restoring grazing lands to grassland had a positive effect on the LUCC. Other major fac
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