甘肃河西地区家畜生产系统能量分析

应用生态学能流研究方法 ,对河西 7县市 4 5年来家畜生产系统能量输入输出及转化效率进行了力能学分析。结果表明 ,自 1960年后饲料能和总产能呈逐年增长 ,以 1980年以后增长幅度较大 ,尤其是武威、张掖两市 ,在总产能组分中 ,畜产品和畜粪尿能逐年增加 ,而畜力能呈逐年降低 ;产投比变化呈现出“减、增、减”3个阶段 ;畜产品转化率不高 ,1994年 7县市畜产品转化效率在 5%～ 6.5%之间

Analyzes of input and output of energy and energy efficiency in animal production system of Hexi, Gansu

The energy input to and output from the animal production system for 45 years, and conversion efficiency from feed to animal products within the period in this system of Hexi, Gansu was analyzed by using method of energy flowing of ecology. The results showed that total output energy and feed energy increased annually since 1960, the trend was seeded up after 1980, particular in Wu Wei and Zhang Ye regions. Whilst animal products and animal wastes increased annually as well, but proportion of animal power energy decreased annually in total output energy. Ratio of output/input energy appeared three distinct phases i.e. decrease, increase and decrease following the different periods. In 1994, the system showed a low energy conversion rate with varying from 5% to 6.5% among 7 counties.