北方农牧交错带种植业能值分析 ——以武川县为例

应用能值理论从农户生产的角度分析了武川县种植业不同作物生产能值。结果表明：该县种植业生产系统能值投入率与产出率“双低”，应增加系统投入以提高产出水平；系统环境负荷率不高，不可更新环境资源破坏严重，应提高可更新环境资源利用效率、加强水土保持工作；辅助能值投入中有机能值略高于无机能值，应按适当比例增加辅助能值投入以提高系统生态经济效益，粮食产出能值中玉米、油菜所占比重高，系统结构调整应遵循生态经济原则，压缩马铃薯面积、提高玉米、油菜等作物播种面积。

Emergy analysis of cropping planting system based on farmers level A case of WuChuan County

The results of emergy analysis of different cropping system in Wuchuan County of Inner Mongolia under farmer view by using the emergy theory indicate that, the emergy input ratio and output ratio of cropping system are low level and should add output level; heighten the utilize ratio of renewable resource by strengthen the water saving because of the loading rate; The organically input overages the mineral input and we should increase assistant emergy to improve system production. The maize and rape has a exiguity higher proportion of yield emergy than other crops; we should increase the sowing area of maize and rape and decease the sowing area of potato according to the economics theory.