基于面源污染控制的农业土地利用系统优化

以福建省九龙江西溪五川流域为例,借助区间数系统优化模型和AGNPS模拟模型,对现有农业生产土地利用方式和管理措施性土地利用方式进行了系统分析,探讨通过土地利用的调整,实现低成本控制农业面源污染的最佳途径。结果表明,五川流域目前的土地利用模式不能满足面源污染控制和经济效益最大化的共同要求,其农业生产习惯和面源污染控制措施也需要适当调整。总体上现有土地利用的经济收益低于最佳土地利用优化的下限收益,环境效益一般的坡草地、香蕉地、果园、菜地和村庄用地所占比例过多。农业面源污染控制性措施的用地规划不够,应加大保护性耕作和建立多水塘系统等措施的用地量。

An Inexact System Programming for Agricultural Land Utilization Based on Control of Non-point Source Pollution in Wuchuan Catchment

An interval numbers optimization model and AGNPS model(Agricultural Non-point Source Model 5.0)were adopted to study the relationship between land use and agricultural nutrient pollution control with the minial cost in Wuchuan Catchment of upstream Xixi River in Jiulong River Watershed,Fujian Province.Both land utilization pattern of agricultural processes and land use pattern of pollution control practices implemented were analyzed systematically.Results indicated that the current land utilization patterns of the catchment needed to be improved,and that the situation of farming habits and management practices should be ameliorated too.The total profit on the basis of the current land use patterns was less than the optimal lower value of system interval.The field scale occupied by pollution control practices with poor environmental effectiveness was too much,such as sloping grassland,banana field,orchard,vegetable and residence.The village should promote the land use with pollution control practices.The area of conservation tillage and multi-pond system are encouraged to increase for their high environmental and economical effectiveness.To achieve a reasonable and applicable program,the decision maker can integrate the solutions of the model with his or her experience and other updated information jointly.