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农业生态系统是以“土壤—作物—动物”三者为基础组成的一个能量转化和物质循环系统。而能量和物质的转化效率直接影响着整个农业生态系统的生产水平。人类要想合理地利用自然资源,建立高产、稳产、低耗的农业生态结构,必须进行物质循环和能量转化的研究。
Agroecosystems are an energy conversion and material circulation system based on “soil-crop-animal”. The conversion efficiency of energy and matter directly affects the production level of the entire agroecosystem. In order to make rational use of natural resources and establish an agro-ecological structure with high production, stable production and low consumption, human beings must carry out researches on material circulation and energy conversion.