云南省楚雄市与双柏县土地利用变化对比研究

利用楚雄市和双柏县1980年和2000年的两期TM影像解译的土地利用数据,对比分析1980²000年云南省高原区的楚雄市与山地区的双柏县土地利用变化及其差异。结果表明:二者20年的土地利用均发生了不同程度的变化,楚雄市土地利用变化幅度大于双柏县,楚雄市建设用地变化是两地所有地类中变化最剧烈的;两地景观多样性指数较高,楚雄有上升趋势,双柏县有下降趋势;两地整体景观破碎度较低,且楚雄市的高于双柏县,但都有下降趋势;楚雄市土地利用系统的有序程度不如双柏县,双柏县的呈上升趋势;两地自然条件的差异是土地利用结构差异的基础,社会、经济发展水平和政府决策的不同,是导致两地土地利用变化有差异的主要因素;人口增长对双柏县的土地利用变化影响大,对楚雄市的影响不明显。

The comparative analysis of land use change between Chuxiong and Shuangbai in Yunnan Province

In this paper, we analyzed the land use change in Chuxiong city, a plateau area and Shuangbai county,a mountainous area in Yunnan Province, based on their TM images in 1980 and 2000. Four kinds of indexes for land use/land cover, two kinds of indexes for the spatial patterns of regional landscape, the land use type transition matrix and information entropy of land use structure were calculated to examine spatial patterns and dynamics of land use change in Chuxiong and Shuangbai. The results show that, due to human activity, the land use change in Chuxiong was greater than that in Shuangbai during the past 20 years. The built-up area and timberland have increased, but cropland, grassland and water area have decreased in both Chuxiong and Shuangbai. The change of water area and grassland in Shuangbai was faster than that in Chuxiong, the change of built-up area and cropland in Chuxiong was faster than that in Shuangbai. Index for landscape diversity in Shuangbai was lower than in Chuxiong, showing a decreasing tendency in Chuxiong, but an increasing tendency in Shuangbai. Landscape fragmentation indexes were high, the landscape fragmentation indexes in Chuxiong were greater than in Shuangbai, both showing a decreasing tendency. The land use system tended to be unstable in Chuxiong, but oppositely in Shuangbai. The main driving forces of regional land use change in Chuxiong and Shuangbai were natural conditions, economic development, structure of production, level of urbanization and governmental decision makings. Effect of population increase on land use in Shuangbai was notable, but it was not marked in Chuxiong.