基于畜禽粪便制有机肥工艺的种养结合生态农业系统能值分析

Emergy Analysis of Planting Breeding Agricultural Ecosystem Based on Livestock Excrements Producing Manure

种养结合农业生产模式已经成为现代生态农业发展的一种新趋势。选取以畜禽粪便制有机肥为中心环节的种养结合模式(模式Ⅱ)和单一养牛模式(模式Ⅰ),运用能值分析方法对两种农业模式的效益及其发展前景进行分析比较。结果表明,模式Ⅱ的能值自给率高于模式Ⅰ,说明能值的投入降低;模式Ⅰ的废弃物利用率0,模式Ⅱ为0.15,表明模式Ⅱ对环境的污染降低;模式Ⅱ的净能值产出率比模式Ⅰ提高了11%,反映出模式Ⅱ的经济效益也具有较高的优势;对于可持续发展指数,模式Ⅱ较模式Ⅰ提高了32%。因此,模式Ⅱ的环境压力小、可持续发展能力强,并且具有良好的经济效益。该研究为此模式的推广提供了科学依据。

The agricultural production model of planting breeding has become a new tendency about the modem eco-agnculture system, tills paper selects a model of livestock excrements producing manure for the pivotal point of planting breeding （ model Ⅱ） and another model of single breeding （ model Ⅰ） , analyzes and compares the benefit and development prospect of the two agricultural model by employing emergy analysis method. The results showed that the emergy self-sufficiency ratio of model Ⅱ is higher than that of model Ⅰ, suggests the emergy input reduce ; The waste utilization of model Ⅰ is zero and the model Ⅱ is 0. 15, shows that the model Ⅱ lowers contamination to the environment; The net emergy yield ratio of model Ⅱ was 11% higher than that of model Ⅰ , reflects the economic benefit of model Ⅱ has higher advantage ; To the emergy sustainable indices model Ⅱ is 30% higher than model Ⅰ. Therefore, model Ⅱ possess that the environmental pressure is smaller and the ability of sustainable development is stronger, in addition, it has a good economic benefit, the research paper provides the scientific basis for the development of the model.