重庆市农业生态系统能流研究

A PRELIMINARY APPROACH TO ENERGY FLOW IN CHONGQING AGRO-ECOSYSTEM

本文对1987年重庆市农业生态系统进行系统分析后得出:单位耕地面积能量输入和输出分别为94.1×10~9J/ha、252.5×10~9J/ha。在投能结构中,非工业能与工业能之比为3.40:1;单位播种面积的工业能投入居全国中等水平,化肥投能增产潜力大,畜禽粪尿能效果显著;能量投入少而复种指数高的县应适当降低复种指数,实行耕地重点投资,以提高单位播种面积产量;畜禽养殖亚系统的生产效率为21.2％;乡村居民在本系统内摄取的食物能为10856.4KJ/人、日,全年烧掉的秸秆相当于整个系统初级生产能量的1/4。

This paperm akes a preliminary approach to systematical analysis of energy in Chongqing agro-ecosystem,it turns out that: the energy input and output in the crop sub-system are 94.1×10~9 J/ha, 252.5×10~9 J/ha,respectively none-industray energy input/industrial energy input equals to 3.40: 1; The industral energy input per ha in the crop sub-system is at the moderate-level of China, input of fertilizer and manure is still more than the energy output continually; The higher cropping index in some areas with less energy input should be reduced to inerease the energy output per unit sown area production; The production efficiency of animal husbandry sub-system is 21.2%; The food energy taken in this agro-ecosystem by villagers is 10856.4KJ/day.person, straw and stalk burnt as fuel is near 1/4 of the total primary product.