吉林省中部不同土地利用类型的土壤侵蚀强度变化分析

Analysis of Different Land Use Patterns and Soil Erosion Change in the Middle of Jilin Province

在GIS支持下,应用TM遥感影像提取土地利用和土壤侵蚀的相关信息,采用叠加分析法研究了吉林省中部不同土地利用状况的土壤侵蚀规律。结果表明:吉林省中部土壤侵蚀整体呈减弱趋势,主要为占吉林省中部面积比例大的耕地侵蚀面积减少所致。但其他土地利用类型则表现为随着土地利用强度的增大,土壤侵蚀速度和侵蚀强度加剧。侵蚀类型由水蚀向风蚀转化,表明中部气候向干旱气候转化的趋势。不合理的土地利用是导致土壤侵蚀强度增大和气候向干旱转化的根本原因,进而又导致吉林省中部土地进一步退化,形成恶性循环。因此,进行水土资源优化利用和合理开发势在必行。

Based on GIS, the information on land use and soil erosion was interpreted from TM Remote Sensed Images. And by overlapping the respective map layers, the analysis was made on the relation between land use and soil erosion in the middle of Jilin Province. Results show the decreasing trend of soil erosion in the middle area of Jilin Province, mainly result from the decrease in erosion area of cultivated land which takes a large proportion in the middle of Jilin. But for other types of land use, the results show the increasing trend in soil erosion is in accordance with the increased intensity of land use. The transformation form water erosion to wind erosion indicates that the trend of climate change towards arid. The unreasonable land utilizeation further, which forms the vicious circle. So, it is development of water and land resources. causes the land in middle of Jilin Province to degradate imperative to out the optical utilization and reasonable