食物生产与土地人口容量的系统分析模型
(1) 粮食增长模型：
式中，
为粮食总产；为每0.067 
耕地上投入的工业能；
为粮食播种面积的变率；
为灌溉农田面积增加速度；
为科技进步贡献率；
为气候波动和灾害影响；
为初始年份的耕地面积；
为灌溉农田相对于旱地的增产系数；
为初始年份的科技进步贡献率。
(2)副食增长模型：
式中，
为产出的副食折能；
为农业人口的物质能量投入；
为油料瓜苹果品饲草作物面积的变率。
(3)人口承载量模型：
式中，
为按人均占粮计算的人口数量；
为按人均占副食计算的人口数量；
为四个消费水平上的人口占粮；
为四个消费水平上的人口副食折能。
参考文献
牛叔文：甘肃省食物生产与土地人口容量的系统分析。生态学杂志，2000，19(1)
According to the status and function of economic and natural attributes of urban land in the socio-economic activities, the use value of the land is analyzed synthetically, the regional differences of land quality are explained, the urban land level is assessed, and the land level is selected, Point information and assessment methods, respectively, to calculate the commercial, residential river industrial land base land price, for the rational use of urban land to provide the basis.
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