重庆市北碚区耕地多功能评价及时空演变分析

Spatio-Temporal Evolution of Cultivated Land Multi-function Based on a Fuzzy Optimization Model in Beibei District, Chongqing

从耕地多功能理论出发,构建耕地多功能评价指标体系,采用改进层次法的模糊优选模型对北碚区2009-2016年耕地功能变化进行研究.结果表明:1)在新时期背景下,耕地的内涵不断丰富,从基本的生产功能逐渐衍生到社会功能、生态维持功能及城镇阻隔功能等集为一体的复合功能.2)北碚区耕地多功能时空演变特征差异明显,生产功能、生态维持功能、社会功能及城镇阻隔功能都有不同程度的变化,生产功能和生态维持功能呈现先上升后下降再上升的“N”型趋势,社会功能变化呈现缓和下降趋势,城镇阻隔功能则逐年增强.3)总体上,北碚区耕地综合功能偏弱,可根据该区特点因地制宜地进行发展.

Based on the multi-function theory of cultivated land,a multi-function evaluation index system of cultivated land was established.The change of cultivated land function in Beibei District of Chongqing Municipality from 2009 to 2016 is studied by using the fuzzy optimization model of the improved hierarchical method.The results show that in the background of the new era,the connotation of cultivated land is constantly extended and,gradually,social function,ecological maintenance function and the function of urban barrier are derived from the basic production function to form an integration of a variety of functions.The space-time evolution characteristics of farmland multi-function differ obviously in Beibei,the production function,the ecological maintenance function,social function and function of urban barrier have a different degree of change.Production function and ecological maintenance function present an N-shaped trend.The change of social function shows a trend of moderate decline,while the function of urban barrier is increasing year by year.In general,the comprehensive function of cultivated land in this area is fairly weak,which can be developed according to the local conditions.