喀斯特地区耕地生态承载力供需平衡

以喀斯特地区耕地生态承载力供需关系作为切入点,采用GIS软件和耕地生态足迹模型,在修正耕地产量因子的基础上构建喀斯特地区耕地生态承载力供需平衡指数,对以喀斯特地貌为主的毕节市2014年耕地生态足迹供需平衡现状进行分析评价。结果显示:(1)毕节市耕地生态足迹供需在空间分布上呈现北部盈余而南部超载的态势;(2)国内生产总值与耕地生态足迹供需平衡指数之间存在负相关关系;(3)耕地生态承载力供需平衡指数与潜在石漠化、轻度石漠化及中度石漠化面积占比之间存在负相关关系,与强度石漠化面积占比存在正相关关系;(4)全市8县(区)中,4个县(区)耕地生态盈余,2个县耕地生态平衡,2个县耕地生态赤字,全市约75.28%的人口生活在耕地生态盈余区和平衡区,24.72%的人口生活在耕地生态赤字区。可为毕节市农业产业结构调整、生态安全预警、区域经济发展及土地利用总体规划编制提供决策依据。

Ecosystem carrying capacity balance of the Karst region in China, based on the supply and demand of cultivated land

The present study investigated the ecological carrying capacity of the Karst region in China, with regard to the relationship between the supply and demand of cultivated land. The study was performed by applying GIS software and the cultivated land ecological footprint method, and the ecological carrying capacity balance index of cultivated land was calculated using the corrected cultivated land production factor of Bijie City in 2014. The results indicated that (1) there is a surplus and deficit in the balance of cultivated land in northern and southern Bijie, respectively; (2) there is a negative correlation between gross domestic product and the cultivated land balance index; (3) there is a negative correlation between the cultivated land balance index and slightly and moderately rocky desertification but a positive correlation between the cultivated land balance index and intense rocky desertification; (4) and, of the eight counties in Bijie City, four possess an ecological surplus, two possess an ecological balance, and two possess an ecological deficit of cultivated land, with 75.28% of the city''s population living in areas of ecological balance and surplus and 24.72% living in areas of ecological deficit. The results of the present study provide a basis for decision-making with regard to the adjustment of agricultural structure, early detection of ecological security issues, regional economic development, and land-use planning in Bijie City.