广西柳州市柳江县耕地利用的时空变化研究

本文采用耕地利用动态模型、变化区域差异模型、空间变化等模型,并结合统计资料、图件资料和土地利用变更调查资料,以广西柳州市柳江县各乡镇作为研究单元,对其1990 ~ 2000年10年内耕地利用的时空变化进行了分析。研究显示:全县2000年比1990年耕地有所增加,但各研究单元耕地增减不一;耕地变化速度最快的是穿山镇,达到133.83 hm2/年,但受研究初期耕地面积的影响,变化速率最大的不是穿山镇,而是拉堡镇,为-2.06 %;全县耕地分布重心10年内移动不大,向东南方向直线迁移距离为0.7264 km;耕地空间转移包括转入和转出两部分,即部分耕地转变为园地、林地等非耕地,同时其他非耕地也在不断地转变为耕地,这主要是由于经济发展、城镇化、农业结构调整造成的。

SPATIO-TEMPORAL CHANGE IN UTILIZATION OF CULTIVATED LAND IN LIUJIANG COUNTY

Based on the dynamic model of utilization of cultivated land resources, the model of regional differentiation of the change in cultivated land and the model of spatial change in cultivated land in combination with all kinds of statistic data, diagram and map data and data gathered from surveys on change in land use, spatio-temporal change in utilization of cultivated land in Liujiang County, Liuzhou City, Guangxi Province in the period of 1990 ~ 2000 was analyzed with a town being a research unit. It is found that the area of cultivated land in 2000 was bigger than that in 1990 but the increase rate varied from unit to unit; in Chuanshan Town it was the highest, reaching 133.83hm2/a, but influenced by the original areas of cultivated land in 1990, the change rate was the highest with Labao Town (-2.06%) rather than Chuanshan Town; the centre of the cultivated land distribution in Liujiang County did not change much during the 10 years and moved a bit, about 0.73 km, towords southeast from that in 1990; the spatial change in cultivated land included entry and exit, which meant some farmlands were changed into gardens, forest lands or some other non-cropland meanwhile some non-farmlands were reclaimed into cultivated land, which was mainly a result of the economic development, urbanization and restructuring of agriculture.