Optimization of Land Use Structure Based on Ecological Green Equivalent
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摘要: 应用系统思想和生态学原理,探讨了土地利用结构优化的生态标准,并将其作为衡量生态合理与否的指标。在充分考虑挖掘其他具有绿当量用地(主要是耕地与草地)的生态服务价值的基础上,引入森林与耕地、草地之间基于"绿量相当"的面积换算关系,定量测算出该类用地的生态绿当量。建立了区域土地利用结构优化的多尺度控制过程模式及生态优化的数学模型,并构建了区域土地利用结构多目标线性规划模型。以海南省琼海市为例进行了生态优化实例分析。Abstract: Optimization of land use structure consists of economic,social and ecological optimization.Applying the minds of system engineering and principles of ecology,this paper presents such thoughts as:① the optimal forest-coverage rate calculated according to the reality of a district is set as the main standard of ecological rationality in the district;② through considering the value of ecosystem services of the land with green equivalent(mainly cultivated land and grassland) and based on the rule:green equivalent,this paper introduces the area conversion between woods and crops,also between woods and grass.Sequentially the value of ecosystem services of theirs is assessed;③this paper establishes a multi-dimension controlling model of optimization of land use structure.Especially,a mathematic model of ecological optimization based on green equivalent is built.In addition,a multi-objective linear programming model for optimization of land use structure is designed.In the end,this paper tests and verifies this theory of ecological optimization based on green equivalent and the optimal forest-coverage rate with Qonghai City in Hainan Province as an example.This research is significant for rationality of land use structure and sustainable land use.
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