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本文提出农业系统熵的概念,并计算了江苏省最高人口密度分布区沿江地区18个县的农业系统熵。结果表明77％的县的农业系统熵都是正值,投入能量的2—40％都处于无效耗散态,这是农田生态系能量转换效率低下的表现。能量的浪费伴随物质的浪费,以扬中县农田氮素平衡为例,该县化肥厂产量的42.9％处于无效耗散态。文中对停办该厂作了论证。
In this paper, the concept of entropy of agricultural system is put forward and the entropy of agricultural system in 18 counties along the Yangtze River with the highest population density in Jiangsu Province is calculated. The results show that 77% of the counties have positive agricultural system entropy, and 2-40% of the input energy are in an ineffective dissipative state, which is a sign of the inefficiency of energy conversion in farmland ecosystems. Energy waste was accompanied by material waste. Taking the nitrogen balance of farmland in Yangzhong County as an example, 42.9% of the output of the fertilizer plant in the county was in an ineffective dissipative state. The paper made a demonstration of the shutdown of the plant.