重庆市建设用地变化的时空差异分析

建设用地的规模、空间分布及其动态变化是政府对土地利用动态监测管理的重要内容.利用1996—2007年重庆市土地利用变更调查资料,运用建设用地动态度和年均变化强度两个指标,对重庆市建设用地变化的时空差异进行定量研究,分析其时空变化的规律及原因.结果表明:从时间层面看,重庆直辖后建设用地中城市用地、建制镇用地、独立工矿用地、交通运输用地和水利设施用地量逐年增长,其中城市用地增长速度最快,而农村居民点用地量持续减少;从空间尺度看,各区域建设用地变化差异性较大,其中"一圈"建设用地持续快速增长,"两翼"增长速度起伏较大,全市75%区县的建设用地增长处于中速及以上变化水平;重庆市建设用地变化的时空差异与工业化和城镇化进程、交通干线及大型水利设施等建设密切相关,跟据预测,今后几年内重庆市建设用地总量仍会持续增长.

Analysis of Spatial-temporal Changes of Construction Land in Chongqing

Scale, space distribution and dynamic change of construction land are the important fields in which the government takes management in dynamic monitoring of land use. Based on the data of the change of land use in Chongqing from 1996 to 2007, using the indexes of dynamic degree of construction land and intensity of annual change, the article analyzed rules and causes of construction land through quantitative research in its spatial-temporal differentiation of the changing process. The results showed that, urban land, town land, independent industrial and mining land, transportation land and conservancy facilities land in construction land increased year by year after Chongqing was directly under the management of the nation from the temporal point of view. The area of urban land has increased fastest, while rural resident land reduced continuously. From the spatial point of view, the differentiations of construction land change were large in different regions, in which the area of construction land in "one circle" has increased fast and continuously , while the rate of grow fluctuated considerably in "two wings", about three quarters of construction land in counties were in the middle or high speed changing level. Spatial-temporal differentiation of construction land in Chongqing was related to the development of industrialization and urbanization, added to the construction of large-scale conservancy facilities and traffic main roads. It is predicted that the quantity of construction land in Chongqing would also increase continuously in the next few years.