城镇扩张占用耕地时空格局及利用效率研究——以成都都市圈为例

Study on the spatial and temporal pattern and utilization efficiency of cultivated land occupied by urban expansion:Taking Chengdu Metropolitan Area as an example

为了减少城镇扩张占用耕地的低效率使用问题影响区域粮食安全,基于GIS平台,结合扩张速度、贡献度指数和等扇形分析等研究方法,对成都都市圈2000—2018年城镇扩张占用耕地的时空格局进行刻画,再结合BCC模型对其利用效率演变规律进行揭示。结果表明,研究区域城镇扩张占用耕地面积为470.528km^(2),扩张速度为24.765km^(2)/年,贡献度指数为74.4%,呈现先增强后减弱的趋势;占用耕地的方向整体由西部、北部向东部和南部转移;综合效率、技术效率、规模效率均呈现先下降后上升的趋势;综合效率空间变化上,高效区由中西部向东南部迁移,较高效区2、3时段集中分布在东北部到西南部,低效区总体位于西部。

In order to reduce the effect of the inefficient use of cultivated land occupied by urban expansion on regional food security,based on GIS platform,this study combined research methods such as expansion speed,contribution index and equal fan analysis to describe the temporal and spatial pattern of cultivated land occupied by urban expansion in Chengdu metropolitan area from 2000 to 2018,and then reveal the evolution law of its utilization efficiency through BCC model.The results showed that the total cultivated land occupied by urban expansion in the study area was 470.528km^(2),the expansion speed was 24.765km^(2)/a,and the contribution index was 74.4%,showing a trend of first strengthening and then weakening;the direction of cultivated land occupation was transferred from the west and north to the east and south as a whole;this study also found that the comprehensive efficiency,technical efficiency and scale efficiency all showed a trend of decreasing first and then increasing.In terms of the spatial change of comprehensive efficiency,the high efficiency zone moved from the central and western regions to the relatively high efficiency areas were concentrated in the northeast to southwest in the second and third periods,and the inefficient area was generally located in the west.