《Table 2 Scheme for optimization of land use structure in the districts of Hohhot》

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《Optimization of Urban Land Use Structure Based on the Perspective of GMOP-GA——A Case Study of the Urban Districts of Hohhot》

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According to the grey interval upper and lower limits of total land use area，single land use area，and total population in the end of the year，and the benefit objective functions in the above stated GMOP content，economic and ecological benefit goal function of related constraint elements were taken respectively，forming the Scheme 1 with the economic benefit maximization as the basis and the Scheme 2 with the ecological benefit maximization as the basis calculated by the general objective programming function model.In addition，set the transferred weight of economic-ecological benefit objective referred to 0.5 both of them and designed the comprehensive benefit scheme on the basis of it by multi-objective genetic algorithm，the calculation results as shown in Table 2.From the perspective of the overall output benefits of the land use structure，the maximum output benefit that can be achieved through Scheme 1 is 9 613.64 million yuan，while the maximum economic benefit of Scheme 2 is 20 199.42 million yuan，and Scheme 3 refer to 16 295.22 million yuan，so that the ecological benefits of Scheme 2 will be greater than the others.From the perspective of suitability of land use combination，the overall land area among the all kinds of benefit objective schemes were 1 205 400 ha，and the proportion of farmland，grassland and forest land in agricultural land is larger than 10%，especially farmland accounted for more than 45%among the all kinds of schemes.As for proportion of subdivided construction land based on Scheme 1，among them residential land and industrial land in construction land is large and reaches 3.71%and 3.23%respectively，while the proportion of commercial and service land is small，which will be not favorable for the transformation of urban economic industrial structure and overall land use output benefits of the study area.In Scheme 2，the area of forest land and commercial and service land is 6 139 ha and 822 ha higher than that of Scheme 1，respectively，which provides sufficient land support for both ecological benefits and urban economic continuous construction.In addition，the proportion of commercial and service land based on Scheme 3 refer to reach 4.98%，which was large than the corresponding type of construction land in the others，it also convenience to generate a significant effect on the multiple evolution of urban economic departments.In summary，due to it possibility of achieving regional economic，social and environmental benefits based on the scheme of ecological benefit objective is much higher than that of the others.Thus，Scheme 2 is taken as the decision scheme for optimization of land use structure.