基于GIS的县域土地利用景观格局演化研究——以大安市为例

GIS-based Study on the Evolution of County-scale Land Use Landscape Pattern

为了探究区域土地利用变化的内在机制,立足县域尺度,以吉林省西部大安市为例,在GIS的支持下,以遥感解译数据为基础,选用土地利用变化和景观生态学的相关指数,对研究区的土地利用/覆被变化和景观格局演化进行研究分析。结果表明,大安市10年来,耕地、草地、林地平均斑块面积减小,林地、草地破碎化趋势明显。研究区景观多样性指数降低,相应的优势度指数提高,土地利用方式的多样化和合理性降低,景观面积向少数几种类型集中的趋势明显。

Inorder to explore the intrinsic mechanism of regional land use change,Da＇an City in west Jilin Province was taken as an example,on the basis of GIS and remote sensing interpretation data,relevant indexes of land use change and landscape ecology were selected to analyze the evolution of land use/land cover change and landscape pattern in the study area.The results showed that,in the recent decade,Da＇an City has witnessed a decreasing mean patch area of farmland,grassland and woodland,and also aggravating fragmentation of woodland and grassland;declining landscape diversity and increasing dominance degrees of certain landscapes;diversified land use types but lower rationality,increasing areas of certain landscape types.