摘要
利用1999年和2003年2个时段的TM、ETM+遥感数据,在GIS和FRAGSTAT景观分析软件的支持下,对二潍库区(盐边)的土地利用类型变化及其景观格局动态进行了定量分析。结果表明:①耕地面积减少,所占百分比呈下降趋势,而有林地、灌木林地、草地所占百分比呈上升趋势。②耕地的斑块数目增加,平均斑块面积减少,斑块密度上升,有林地的斑块数目减少,平均斑块面积增加,斑块密度下降,草地的斑块数目不断增加,平均斑块面积增加,斑块密度下降。③有林地、灌木林地的面积加权平均斑块形状指数略有上升,斑块形状趋于复杂,而耕地、草地、疏林地的该指数略有下降,斑块形状趋于简单化。④从景观水平上看,景观格局变化的特征是斑块数明显增加,拼块平均面积减少,斑块密度增加,最大斑块指数减少,说明景观破碎度增加,景观异质性增强。蔓延度上升,散布与并列指数减小,说明景观的连通性增强。⑤景观多样性指数和土地利用相对合理指数增加,坡度较大的地区,耕地面积明显减少,相应地林地、草地面积增加,整体上土地利用结构趋于合理。
Based on translated data from remote sensing images in 1999 and 2003 ,using GIS and landscape pattern theory, the dynamic changes of land use types and landscape patterns in the Ertan Reservoir Area（Yanbian County） were analyzed. The results have shown： （1）The area percentage of farmland declines obviously, while the percentage of woodland, bush-land and grassland increases. （2）The patch number of farmland increases, mean patch area declines, and patch density drops; the patch number of woodland increases, mean patch areas increases, and patch density declines ; the patch number of grass-land increases, mean patch area increases, and patch density declines. （3）The AWMSI of woodland and bush-land increases a little, the AMWSI of farmland, grassland and sparse forest land declines, implying the shapes of patches of woodland and bush-land are getting complicated, while the shapes of patches of farmland, changes of grassland and sparse forest land are becoming landscape patterns are as follows： the patch simple. （4）From the land-level, the characters of number increases, mean patch area declines,patch density increases, and LPI declines, showing the increase of fragmentation degree. The CONTAG increases, while IJI declines, implying the connectedness of landscape is getting enhanced. （5）The landscape diversity is becoming bigger and the relative land use rationality index in 2003 is bigger than that in 1999, meaning that the land use structure has been improved.
出处
《四川林业科技》
2007年第3期23-27,共5页
Journal of Sichuan Forestry Science and Technology
基金
国家"十一五"科技支撑项目(2006BAD0303A05-01)
四川省杰出青年学科带头人培养计划基金项目(06ZQ026-014)
