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本文根据耗散结构理论指出农田生态系是一个有完整意义的生态经济系统。生态经济系是生态与经济要素融合形成的独立研究客体,研究的是系统中物质、能量和价值循环增值的规律。研究的根据是物质、能量和价值运动的信息,系统中的物流和能流,是通过价值流来体现的。文中以苏南扬中县为例,讨论了长江三角洲农田的投资效益、能耗水平、能耗构成转换效率及其影响因素,提出了适合该地区现阶段的农田能量投入产出关系的数学模型,并讨论了能量转换效率降低的原因和节能稳产的途径。
According to the theory of dissipative structure, this paper points out that farmland ecosystem is a complete ecological economy system. Eco-economic system is an independent research object formed by the integration of ecological and economic factors, and studies the law of material value, energy and value added value in the system. The research is based on the information of material, energy and value movements. The logistics and energy flow in the system are reflected through the flow of value. Taking Yangzhong County in southern Jiangsu as an example, the investment efficiency, energy consumption level, energy conversion efficiency and its influencing factors of farmland in the Yangtze River Delta are discussed. A mathematic model suitable for the energy input and output of farmland at this stage is put forward. The reasons for the decrease of energy conversion efficiency and the way of energy saving and stable production are also discussed.