| Along with the development of society productivity,the land usepattern structure and layout tend to be complicated.In certain areas,to reachoptimum goals of sure ecological,economy and social benefit of land use system,studying the land use structure optimizedly and realizing sustainableuse of the land resources become an urgent subject that to be solved in landscience,especially in the science of land use.To probe into rationalcollocation of land use structure at space and time,we must seek help fromthe systematical timization method.In the course of land use optimal allocation,the systematical optimization method is quantitative analysis course in which the mathematics model was taken as main means ctually.Grey multi-objective linear programming is a kind of dynamic linear programming, which carries on when technological coefficients are variable dust and restriction value and are in the process of development.Realizing optimization of the land use structure by the Multi-objective grey linear programming model remedies the deficiency of the general linear programming,whereas,we can know not only the optimum structure under certain condition,but the situation of it's development and change.This paper regards the East and Southern Mountain area---Nantong city as studying area,2006 as annual base period.At first,the essential feature and existing problem of the land resource in Nantong city were analyzed qualitatively according to the county's data over the past years(1996～2006).Then,the population,No- agricultural population,grain perunit area yield,rate of forest overlay,the population density agricultural land,the population density of town to 2020 are predicted in Guidong county according to the county's data over the past years(2001～2006) by applying the Grey multi-objective linear programming predicting model of Average growth method,GM(1,1).Based on this,the grey linear programming model was set up,and the land use structure was optimized with 11 variables setup according to feature of the land sources,the demand of society and economy development,management custom and development direction in the future of the county,the maneuverability of relevant data was considered comprehensive as well. To embody the principles of high benefit and low cost of land use and the optimal collocation of land resources,the upper limit,lower limit and median of the constraint parameters were adopted separately and calculated by WINSQB,and three optional schemes were constructed to the ultimate.The optimum scheme of land use structure of Nantong county was obtained,AHP to optimize those schemes was applied also.Here is the optimized result:the area of cultivated land,garden land,forest land, grazing land,rural residential land,independent industries and mineral land as well as industrial and mining land,traffic Land,waters and unused Land should to be adjusted from 2.79:0.03:0.06:0.00032:1.00:0.84:1.10:1.036:0.40:0.0399:1.56 in 2006 to 2.96:0.04: 0.13:0.00032:1.00:1.73:0.31:1.042:0.56:0.0445:1.04 in 2020.Only in this way,the land resources can be collocated rationally,the ecological,economy and social benefit of land use can be exerted to the optimization,the poor situation can be changed,the sustainable development of land resources can be realized of Nantong city. |
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