【正文】 Bioeconomic village Model continue? Mathematical programming approach:– A major advantage of LP Model is that can bine economic behavior and biophysical process in an integrated framework.– Leontief inputoutput coefficients permits the bination of inpatible economic and biophysical production function.– A disadvantage of LP Model is that may generate vast amount of ‘whatif’ results if some of parameters of the model are not known with great accuracy. 鄂爾多斯高原人地關(guān)系行為機(jī)制模型? Bioeconomic village LP Model– Shortterm analysis: one year due to uncertainty– Village model: appreciate level of analysis– Objective function：maximizing benefit of households– Production function： Leontief inputoutput coefficients – Consumption function：consumption choice based upon nutrition and prices under constraints of basic nutrition intake demand and hobby– Soil conservation process： converted land supply– Feedback of soil erosion to production：no feedback processBioeconomic village LP Model (1). (2) (3) (4) (5) (6) Variable definition: household discounted utility: period: crop: land type: land endowment: the area of crop produced on land type in period : the per unit price of crop or livestock output: the yield function for production of crop c or livestock v: a vector of inputs used in production of crop c or livestock v: the per unit input price for input Variable definitioncontinue: the crop or livestock output used for selfconsumption: the crop or livestock output used for selfsupply, such as fodder, draft animal: the production of units of livestock at period t: livestock: the wage level, such as seasonal offfarm wage , constant offfarm wage hiring labor wage : the offfarm labor supply of seasonal parttime labor or constant offfarm labor: the hiring labor supply : family labor: family labor input for farm activities : total labor input for farm activities: discount rateModules of LP Model? Processes (73)– Production (22): cropping corresponding to land typeCorn, Millet, Potato, Sunflower, Rapeseed, Beans, Goat, Sheep, Hog, Cattle– Sale (11): Corn, Millet, Potato, Sunflower, Rapeseed, Goat, Sheep, Hog, Mutton, Pork, Wool– Selfconsumption (6): Corn, Millet, Potato, Beans, Mutton, Pork– Purchase (11):Wheat, Rice, Pork, Mutton, Beef, Vegetable, Fertilizers, Pesticide, seeds, Coal – Selfsupply (5):Seeds, Fodder, Manure, Firewood– Resource supply(17): Land supply(6), Labor supply(11)– Land degradation (1): Soil erosionModules of LP Model continue? Constraints (70)– Products (12):