湖南省“3+5”城市群农业功能权衡-协同特征及优化研究

Research on Agricultural Function Trade-offs and Synergies Characteristics and Optimization of“3+5”Urban Agglomeration in Hunan Province

农业各功能之间保持着相互增进的协同关系或此消彼长的权衡关系。本研究以湖南省“3+5”城市群地区的县(区)为研究单元,从生产功能、生态功能和生活功能3个维度构建农业功能评价指标体系,利用熵值法、Spearman秩相关系数法和双变量局部空间自相关模型等对农业功能演变及协同-权衡关系进行测度。结果表明:(1)农业生产功能整体呈增强态势;农业生活功能呈先上升后下降的趋势;农业生态功能往城市群外围扩散。(2)在协同与权衡关系上,农业生产功能和其他两项功能空间分布变动较大,具有较强的不稳定性,生产功能和其他两项功能的协同与权衡关系在空间分布上较为稳定。(3)功能分区上可划分为5种组合类型:生产功能优势区、生活功能优势区、生态功能优势区、多功能并重区和农业功能弱势区。

Various functions of agriculture maintain a synergistic relationship or a trade-off relationship of mutual promotion between them.This study,taking counties(districts)in the“3+5”urban agglomeration areas of Hunan province as the research units,constructs an agricultural function evaluation index system from three dimensions:production function,ecological function,and living function.Further,this study measures the evolution of agricultural functions and the relationships of trade-offs and synergies using methods such as the entropy value method,Spearman's rank correlation coefficient method,and the bivariate local spatial autocorrelation model.The obtained results are as follows.(1)The overall trend of agricultural production function is being strengthened.The trend of agricultural living function shows an initial increase followed by a decrease.The agricultural ecological function is expanding towards the periphery of the urban agglomeration.(2)In relation to coordination and trade-offs,the spatial distribution of the agricultural production function and the other two functions changes greatly and presents strong instability.The coordination and trade-offs relationship between the production function and the other two functions is relatively stable in spatial distribution.(3)The functional partition can be divided into five combination types:production function advantage area,life function advantage area,ecological function advantage area,multi-functional area,and agricultural function disadvantage area.