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中文摘要：
农地的特性决定了其系统具有耦合性，农地系统耦合的意义在于其对农地承载力产生重要影响．农地系统承载力是一个合力，其大小取决于各子系统承载力的“大小”和“方向”，系统耦合正是通过调整分力的“大小”和“方向”，实现农地承载力的拓展．系统耦合对农地承载力拓展的途径有：增强种间耦合，调整土地利用结构和农林牧渔复合经营等．
英文摘要：
Base on the analyses of the characteristics of farmland resources, system coupling is one of its properties. The significance of the property is that system coupling can influence farmland carrying capacity greatly. Farmland carrying capacity is a composition of forces. In other words it is a vector in mechan- ics,specified by the magnitude and direction of component of forces. System coupling adjusts the ＂magnitude＂ and ＂direction＂ of subsystem to increase farmland carrying capacity. The paper puts forward three methods increasing farmland carrying capacity through system coupling, including integrating different species, adjusting farmland use structure and compound management of planting, forestry, animal husbandry and fishery.
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