关键词: 动态分析, 粮食生产, 能量转化效率, 种植业系统

Abstract:

Based on analysis on structure change of modern planting in Luancheng county, the paper discussed the local dynamic efficiency of energy input in planting system from 1984 to 2006 and draw some conclusions as follows: the organic energy input with the majority of straw directly returned to field has been the leading part of energy input since the middle of 1990s, and the tendency of enlarged gap between organic energy and industrial energy input began to have a little turn because the industrial energy subsidies increased rapidly in the later period. We further analyzed the energy flow structure of grain production, finding that the general energy efficiency was not down dramatically from 1.78 in 1993 to 1.67 now, which indicates that increasing organic energy input required more energy engineering and chemical fertilizer input, and they coordinated to form a steady and high- productivity system. But a problem which has been raised at the same time is that the most part of industrial energy is machine fuels and electricity consumed by irrigation. That indicates the farming system of combination of agriculture and animal husbandry, the water- saving irrigation and the corresponding crop structure distribution are three important tasks to improve the agricultural production construction and energy and resource- efficiency.

Key words: dynamic analysis, energy efficiency, grain production, planting system