滇西北三江并流区土地利用变化研究

土地利用变化会改变地表覆盖,从而影响环境质量及陆地生态系统性质。开展区域土地利用/土地覆盖变化研究,可为区域土地资源优化利用和可持续发展提供科学依据。以第二次土壤普查资料和土地详查资料为依据,采用土地利用变化指数模型,定量分析三江并流区1983年到1999年土地利用变化特征,结果表明:(1)与土地利用结构分析法相比,土地利用变化指数模型更能反映土地变化趋势及在时空上变化特点;(2)研究区土地利用程度不断提高,其中林地园地、耕地与城郊用地增加较快;(3)1983～1996年间的变化大于1996～1999年间的变化;(4)州政府所在地(香格里拉县、泸水县、丽江县)的变化较其它地区大;(5)土地利用变化的主要原因是社会经济因素,包括人口增长、科技进步、经济增长、传统文化继承与发展、政策变化等。

LAND-USE CHANGE AND ITS DRIVING FORCES OF "THREE PARALLEL RIVERS" IN NORTHWEST YUNNAN PROVINCE

Land use change can convert the earth surface cover, which will deeply influence geo-chemical cycle, envi ronmental quality, biodiversity of earth, as well as productivity and adaptability of terrestrial system. The regional research on land use/land cover change (LUCC) can provide the scientific basis for the optimization utilization of land resources and regional sustainable development. Based on the second general soil resources data and special land census data, a series of land use change indicator models had been adopted to analyze the changes (from 1983 to 1999) of land use patterns of the "Three Parallel Rivers" in the paper. The result showed: (1) Compare to traditional land use structure analysis, land use change index models can reflect the general trendy and temporal and spatial change in more details. (2) The land use degree had been increased continuously, especially for forest-garden land, cultivated land and built land. (3) The degree of land use change of 1983～1996 was bigger than that of 1996～1999. (4) The land use change degree of counties that prefectures located (such as Shangri-la, Lushui and Lijiang) was faster than of that othercounties. (5) The main driving forces of LUCC of this area were social-economy factors, including population growth,science technology development, growth of economy, inheritance and development of ethnic cultures, changes of policy and laws related to resources use and environmental protection.