| 摘要: |
| 【目的】 研究陕北风蚀水蚀过渡区的土地利用/覆被分布格局及变化规律，为该地区土地利用规划与管理提供依据。【方法】 以1986年和2003年的TM影像为数据源，利用分层分类法获得陕西榆林市横山县两个时期的土地利用/覆被图，分析其动态变化。【结果】 1986-2003年，横山县土地利用/覆被变化的总体规律为：水浇地、有林地、灌木林、草地、城镇用地和荒草地的面积增加，增幅最大的是灌木林地；旱地、水域和沙地面积减少，减幅最大的是旱地。在类型转化上，旱地向林地和草地转化，草地向灌木林转化，沙地向灌木林和草地转化。【结论 】 受国家退耕还林还草工程和沙地综合治理措施的影响，横山县的土地利用/覆被类型及其面积发生了较大变化，该县的生态环境质量正在逐步提高。 |
| 关键词: 横山县 TM影像 分层分类 土地利用/覆被 动态监测 |
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| 基金项目:国家科技支撑计划项目(2006BAD09B0603);国家自然科学基金项目(30872073) |
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| Study on land use/cover change of wind water erosion region in recent two decades |
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XIE Jia yang WANG Zhao hui LI Sheng xiu
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| Abstract: |
| 【Objective】 The researth studied the land use/cover change of wind water erosion region to provide evidence for land use planning and management of this area. 【Method】 Taking TM image as data source,we used the hierarchical classification method to obtain land use/cover maps of Hengshan County in 1986 and 2003,then analyzed the dynamic changes.【Result】 The law of land use/cover change of Hengshan County from 1986 to 2003 was:The area of irrigated land,forest land,shrub forest,grassland and waste grassland increased,and the largest increase was shrub forest.The area of dry land,water area and sandy land decreased,and the largest decrease was dry land.The types of transformation were:dry land transformed to woodland and grassland,grassland to shrub forest,sandy land to shrub forest and grassland.【Conclusion】 Affected by the project of conversion cropland to forest and grassland and the control measures of sandy land,the type and area of land use/cover of Hengshan Conrty has changed a lot,the quality of ecological environment of Hengshan County is being improved gradually. |
| Key words: Hengshan County TM image hierarchical classification land use/cover dynamic monitoring |
