摘要
应用GIS技术及分形理论,以云南省滇池流域为研究区,将土地利用类型划分为5类：耕地、林地、草地、水域及城乡工矿居民用地,并进行各土地利用类型图斑分形维数分析。结果表明：土地利用类型的分布具有分形结构,各土地利用类型分维值介于1.09～1.35之间,总分维值1.146。根据分维值对各土地利用类型稳定性排序：林地〉草地〉耕地〉水域〉城乡工矿居民用地。若不考虑水域影响,稳定性指数均介于0.2～0.5之间的土地利用类型面积占研究区土地总面积的80.18%,总体稳定性良好。说明在人为规划影响下,滇池流域土地利用总的发展比较稳定,人为因素、人工措施的实施比较合理。分维值能较好反映各土地利用类型复杂程度及稳定性。
Based on fractal method and GIS technology,the land use of can be classified into 5 types：cropland,woodland,grassland,water land,industrial and residential areas,and analysis on fractal dimension of Dian chi lake basin in Yunnan province.The algorithm is a fractal dimension expression about area and perimeter.The results indicate that land use type can be described with fractal structure.Fractal dimension（D） values vary from 1.09 to 1.35 in the case application of Dianchi lake basin.The D of land use types reflects the degree of complexity,stability and developing trend.When the value of fractal dimension（D） is 1.5,namely D is critical value;the change mode of land use types is Brown random movement.The more of value of D is closer to the critical value,the more the stability of land use type is worse,and the complexity of land use type is higher.Stability order from higher to lower based on fractal dimension is：woodland,grassland,cropland,and water area,industrial and residential areas.Correspondingly,the dimension of woodland and grassland are lower than industrial and residential areas because of simple structure and lack of human impact.Without considering the impact of water land,80.18 percent of studying areas hold the stability indexes between 0.2 to 0.5,which means the total stability is in a good condition.The research indicates that land use in Dianchi lake basin is developing steadily.Based on geographical and human factors that influence land use structure,the artificial measure and programming are proved reasonable.The fractal dimension values are integrative reflection of the land use structure and stability.
出处
《环境科学与管理》
CAS
2010年第3期131-134,共4页
Environmental Science and Management
基金
全国重点湖泊水库生态安全调查与评估项目
关键词
土地利用类型
分形
分维
滇池
land use type
fractal
fractal dimension
Dianchi
