松嫩平原肇源县土地利用结构低碳优化研究

Study on Optimization of Low Carbon-Based Land Use Structure in Zhaoyuan County of Songnen Plain

土地利用结构调整是实现低碳经济型发展模式的关键途径之一,以松嫩平原区肇源县为研究对象,从经济效益最大化和土地碳排放量最小化两方面出发,基于多目标规划方法,得到了2020年肇源县土地利用结构低碳优化方案并进行对比分析。结果显示:低碳优化方案中,农用地、建设用地和未利用土地相对面积比例依次为65.60%,7.24%和27.16%,与规划方案相比,碳排放量共减少2.62万t,对应经济效益增加量2.45亿元,与2005年相比,单位GDP碳排放强度下降46%,有效实现了碳减排目标。优化方案中,建设用地是最主要的碳源,其碳排放量占总量的98%以上;最主要的碳汇是林地和水域,二者碳吸收量之和为89%以上。以上结果表明以经济效益最大化和土地利用碳排放最小化为目标的土地利用结构低碳优化方案可以较好地兼顾经济效益和生态效益,并有效减少城市碳排放量。研究为该地区未来低碳经济发展提供指导意义。

Land use structure adjustment is one of the key ways to realize low carbon economic development model.In this study,we used the multi-objective linear programming method to establish two objective functions,the maximum economic benefits of land use and carbon emissions minimization of land use,to pick out the low carbon optimization scheme of land use structure optimization of Zhaoyuan County in 2020,and performed the comparison analysis.The results are as follows：according to 2020 low carbon optimization scheme,areas of farm land,construction land and unused land account for 65.60%,7.24%,and 27.16% of the total land area respectively.Compared with the planning scheme,carbon emissions can be reduced by26 200 t,the economic benefits increase 245 million Yuan.Compared with 2005,the per unit GDP carbon emission intensity decreased by 46%,the carbon reduction target had be realized effectively.In the optimization scheme,construction land is the main source of carbon emissions accounting for more than 98%;the most important carbon sinks are woodland and water,both of which the sum of carbon sequestration account for more than 89%.The results show that establishing the maximize economic benefits of land use and carbon emissions minimization as the objective function,and the low carbon optimization scheme can be very good in both economic and ecological benefits of land use structure of the city,reduce carbon emissions,and provide guidance for the future economic development of this region.