朱溪流域地形特征对土地利用/覆被空间格局的影响

以朱溪流域为研究区,2007年SPOT遥感影像和1∶1万地形图为数据源,采用3S技术为平台,提取土地利用/覆被类型图,生成高程、坡度和坡向三个地形因子,研究地形因子对土地利用/覆被空间格局的影响.结果表明:1)林地和耕地主要分布在海拔470 m以下,且面积比例随着海拔的增高而减小.草地主要分布在海拔270 m～370 m,其比例只有0.33%.园地、居民点及工矿用地、水域和未利用地少量分布在270 m～470 m.2)耕地在坡度0°～7°所占面积比例最大.随着坡度增大,林地的面积比例逐渐增加.草地面积比例仅在坡度0°～7°之间分布有0.65%.园地面积比例在7°～15°最大,其后随坡度增大而减小.居民点及工矿用地、水域和未利用地三者的面积比例均随坡度的增大而不断下降.3)耕地在平地上的面积比例最大,占70.46%.林地占东坡、南坡、西坡和北坡的面积比例都最大,均占60%以上.园地在东坡、南坡和西坡的面积比例较大.草地在平地、西坡和北坡的面积比例较为一致,在东坡、南坡均没有分布.

Influence of Terrain Characteristics to the Spatial Pattern of Land Use/Cover in the Zhuxi Watershed

Taking the Zhuxi watershed as the researched areas,this paper used the 2007 SPOT image and 1∶10 000 topographic maps as input data and used 3S technique as the platform to extract the land use/cover types and generate the elevation,slope and aspect factors.Finally,this paper analyzed the influence of terrain factors to the spatial pattern of land use/cover.The results show that:1) Forest land and cultivated land mainly distribute below 470 m and the greater the elevation is,the smaller the areas are.The distribution of the grass land is only 0.33% at an elevation from 270 m to 370 m.garden land、residential and mining land、water bodies and unused land distribute rarely from 270 m to 470 m,and there is no distribution above 470 m.2) The area proportion of cultivated land in the slope of 0°~7°accounts for the largest.Along with the slope increases,the area proportion of forest land increases gradually.The distribution of grass land is only 0.65% in slope of 0°~7°.The area proportion of garden land is maximum in slope of 7°~15°and the following decreases gradually with the slope increases.The area proportion of residential and mining land、water bodies and unused land decrease constantly with the slope increases.3) On flat ground the area proportion of cultivated land accounts for the largest,and it’s area proportion is 70.46%.Forest land accounts for the largest in the four directions,and the area proportion all account for more than 60%.The area proportion of garden land is maximum in the east slope,north slope and west slope.The area proportion of grass land is relatively coincident on the flat ground,the west and the north slope,while there is no distribution in the east and north slope.