城市化驱动机制下的农用地健康评价

Health appraisal of farmland under mechanism of urbanization drive

农用地健康评价是实现土地数量、质量和生态并重管理的基础研究,是粮食安全(产量与品质)的重要保证。文章选取位于京津冀接壤区的城郊农用地作为研究区域,在系统分析城市化驱动对城郊农用地影响的基础上,研究建立了包括质量目标、产能目标和土壤环境目标的农用地健康评价体系,并以农用地分等数据为基础,通过实地调查与化验分析获取指标属性,采用模糊评价模型评价研究区域的农用地健康状况,结果显示,区域内农用地分别隶属很健康、健康和亚健康3个级别,非模糊化处理后的农用地健康指数在0.539～0.736之间,区域内农用地健康状况较好,但城市化驱动使农业收益增加的同时,也导致一定的土壤环境污染风险。研究表明,建立的评价体系与方法对开展农用地健康评价有借鉴意义,针对评价指标的隶属度分析较好反映了城市化驱动对农用地健康状况的影响。

The health appraisal of farmland health is basic for achievement of pay equal attention on land quantity,quality and ecology,and the status of farmland health is important to guarantee of food security （production and quality）.Based on the comprehensive analysis of the influence of urbanization actuation on suburb farmland,a case study was conducted in the border region between Beijing,Tianjin City and Hebei Province in China.The indicator attributes were obtained from farmland classification data,field investigation and laboratory analysis of samples.This study established an appraisal system including quality,productivity and soil environment to evaluate the health of farmland with a composite index developed by using the fuzzy evaluation model.The evaluation results showed that the health status of farmland in region mentioned above was divided into three classes,namely in perfect health,normal health and sub-health,and the index of farmland health defuzzified by centroid method ranged from 0.539 to 0.736.The status of farmland health was good in the study area,but the potential pollution risk of soil environment had risen with increased agricultural income by urbanization drive.This study indicate that the appraisal system and method are helpful and meaningful to carry out the farmland health evaluation,and the evaluating indicators degree of membership analysis can sufficiently reflect the influence of urbanization actuation on farmland health.