人口激增、资源短缺、环境恶化日益成为威胁人类生存的三大危机。尽管人类已开始使用营养液来培养植物,生产食物,但土地仍是人们获取食品的最便于使用、最经济的资源。土地位置的不可移动性、数量的有限性等,决定了土地的生产力在一定时间、一定技术经济条件下,不可能无限制地 The population explosion, shortage of resources and deterioration of the environment are increasingly becoming the three major crises that threaten human existence. Although humans have begun to use nutrient solutions to grow plants and produce food, land is still the most accessible and economical resource for people to access food. The immutability of the location of the land, the limited number, etc., determine the productivity of the land at a certain time, under certain technical and economic conditions, it is impossible to unlimited