2005~2015年耕地多功能时空演变及其协同与权衡研究——以重庆市沙坪坝区为例

基于2005~2015年近10 a面板数据,在测算重庆市沙坪坝区耕地多功能基础上,探究其时空演变规律、多功能间协同与权衡关系,据此构建耕地空间组织经营模式。结果表明：耕地生产功能、景观游憩功能、社会保障功能及建设空间储备功能时空演变特征差异显著。耕地“生产-景观游憩-社会保障”功能间存在两两协同关系,且协同度均值 “生产-景观游憩”>“社会保障-景观游憩”>“生产-社会保障”;耕地建设空间储备功能与其他3项功能间存在此消彼长的权衡关系。据此构建了“一带两区”即山地休闲农业带、郊野农业游憩区、传统农业提升区的耕地空间组织经营模式。

Spatio-temporal Evolution and the Synergy and Trade-off Relationship of Cultivated Land Multi-function in 2005-2015: A Case of Shapingba District,Chongqing City

Taking Shapingba district which is the suburb area of Chongqing municipality as the study area, this study establishes evaluation index system of cultivated land multi-function. According to the evaluation index system, this study measuresthe cultivated land production function, the landscape and recreation function, the social security function and the construction space reserve functionbasing on the panel data from 2005 to 2015. Thereby, we explore the spatio-temporal evolution of cultivated land multi-function, reveal the relationship of synergy and trade-off among the multi-function of cultivated land, and set up the spatio organization and management pattern of cultivated land. The results show as follows: First, the spatio-temporal evolution of multi-function of cultivated land shows significantly different characteristic. Among them, the cultivated land production function and the landscape and recreation function emerge aninverted V glyph trend that rises first and falls later, and the spatial pattern characteristics which is high in the around and low in the middle; the social security function shows a sharp downward trend and the spatial pattern characteristics which generally distributes low value parts and juts out in the high value parts. Also, the construction space reserve function appears a steady upward trend and the spatial pattern characteristics which is high in the middle parts and low in the around. Second, there exist a mutual benefit synergistic relationship and “one loss and another gain”trade-off relationship among the multi-function of cultivated land. Specifically, the synergistic relationshipperforms as the cultivated land production function, the landscape and recreation function and the social security function coordinate in pair. The mean value of synergy degree of “production function-landscape and recreation function” is bigger than “social security function-landscape and recreation function” which is bigger than “production function-social security function”. Meanwhile, the trade-off relationship performs as a “one loss and another gain” kind of pattern between the construction space reserve function of cultivated land and either of the other three functions. And third, according to the spatio-temporal evolution rule of cultivated land multi-function, combining with the synergy and trade-off relationship among the multi-function, the study establishes cultivated land spatial organization and management pattern of “one belt and two area”. The “belt” means a hilly leisure agriculture belt that takes fruits and vegetables planting as the core activity, while the “two areas” includes a suburb agricultural recreation area that mainly manages flowers and fruits industry, and a traditional agricultural promotion area which takes rice production as the core activity.