区域土地利用中耕地动态变化及其保护

以四川盆地乐山市为研究对象,利用区域内7县、4区已经建立的土地利用数据库为主要信息来源,采用GIS分析工具,对土地利用中与耕地相关的大量数据进行了整理、统计和分析,并结合采集的相关文字资料和图件资料对区域内耕地的动态变化进行分析。结果表明,1996—2005年,区域内耕地呈现出明显的下降趋势,其主要影响因子的作用顺序依次是生态退耕、农业结构调整、建设占用耕地、自然灾毁,它们在耕地减少中所占比例分别是83.5%、11.4%、4.6%和0.5%。针对区域耕地变化情况,提出了增加耕地的方式和可能途径,并对区域内耕地保护提出了建设性措施。

Study on Dynamic Change and Protection of Cultivated Land in Regional Land Utilization

Taking Sichuan basin Leshan as the study object, using the land utilization database which established in 7 counties, 4 districts of Leshan for the main information origin, and GIS analysis tool, plenty of data on cultivated land was analyzed and put in order. At the same time, the dynamic change of cultivated land in this region was studied by correlation writing material and the graphic document material collection. The result indicated that in 1996-2005 year, cultivated land presents the obvious drop tendency in the region, the major effect factor sequence of action is taking back from agriculture returns the forest for ecology, the agricultural structure adjustment, the occupying the farming for construction, the natural disaster destroys. These reduce in the farming account for 83.5%, 11.4%, 4.6% and 0.5% respectively. In view of the region cultivated land change situation, some the style and the possible way of increasing cultivated land was proposed, and some constructive measure was put forward for protection cultivated land in this region.