XIE Xian-jian,WEI Fang-qiang.Study on Fractal Dimension and Stability of Land Use Types in the Area with High-frequency Debris Flow[J].Research of Soil and Water Conservation,2011,18(06):167-171,176.
泥石流频发区土地利用分形特征及稳定性研究
- Title:
- Study on Fractal Dimension and Stability of Land Use Types in the Area with High-frequency Debris Flow
- Keywords:
- land use type; fractal dimension; stability; debris flow
- 分类号:
- P642.23;F301.24
- 摘要:
- 应用GIS技术及分形理论，以云南省小江流域为研究区，将土地利用类型划分为6类：耕地、林地、草地、水域、城乡工矿居民用地及未利用地，并进行各土地利用类型图斑分形维数分析。结果表明：小江流域土地利用方式在区域分布上相对集中，土地利用类型以草地、林地和耕地为主，分别占全流域面积的52.78%，28.07%和15.77%，土地利用结构相对单一；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为1.197 2~1.498 4，平均分维值1.327 9；根据分维值对各土地利用类型稳定性排序：林地>未利用地>城乡工矿居民用地>耕地>草地>水域；稳定性指数介于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42.66%，总体稳定性较差。说明在人为和自然因素影响下，小江流域土地利用总的发展趋势不稳定，人为扰动因素的实施欠合理。分维值较好地反映了各土地利用类型的复杂程度及稳定性。
- Abstract:
- Base on GIS and the fractal theory, land use types in Xiaojiang River basin in Yunnan Province were divided into six types: cultivated land, forest land, grassland, water body, urban and rural mining resident land, and unutilized land. Then patch shape fractal dimensions of different types of land use were calculated. The results showed that land uses in Xiaojiang River basin relatively intensively distributed in different areas. The grassland was the main type of Xiaojiang Ravine land-use type, followed by the forest land, the cultivated land again with respective shares of the total area of ravine 52.78%, 28.07% and 15.77%, and the land use structure was relatively simple. Land use types could be described with fractal structure. Fractal dimension(D)values varied from 1.197 2 to 1.498 4, average value was 1.327 9. Stability order from higher to lower based on fractal dimension was: forest land, unutilized land, urban and rural mining resident land, cultivated land, grassland, and water body. 42.66 percent of areas hold the stability indices between 0.2 to 0.5, which showed the total stability was in a bad condition. Furthermore, due to natural and human activity factors, land use in this basin was developing unsteadily; implementation of human disturbance factors was unadvisable. The D of land use types reflected the degree of complexity, stability and developing trend.
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备注/Memo
收稿日期:2011-4-28;改回日期:2011-6-7。
基金项目:中国科学院知识创新工程资助项目(KZCX3-SW-352);内江师范学院博士启动基金09249)
作者简介:谢贤健(1978- )，男，四川广汉人，博士，讲师，主要从事水土保持理论及技术研究。E-mail：xxj007-14@tom.com