长汀县循环农业产业联盟模式能值分析

实施种养结合,将农牧生产废弃物利用并回流坡耕地和开展地力恢复是长汀县水土保持的重要内容.应用能值分析法分析2014年长汀县循环农业产业联盟和长汀县农业生态系统(对照)的净能值产出率、能值投资率、环境负载率和可持续发展指数,以及循环农业模式能量流动特征.结果表明:2014年循环农业产业联盟的净能值产出率、能值投资率、环境负载率和可持续发展指数分别为7.12、49.35、0.44和16.26.同期长汀县农业生态系统的净能值产出率、能值投资率、环境负载率和可持续发展指数分别为1.20、3.29、0.23和5.17.循环农业产业联盟净能值产出率和可持续发展指数分别高于当地农业生态系统5.92和11.09个单位,对当地农业发展具明显带动作用.提出了有关优化循环农业产业联盟的建议:1)控制牧业生产规模;2)扩大有机肥厂生产规模;3)引进更多的种植企业,参与循环产业联盟,利用沼液;4)增加科技投入,提高沼气和沼液利用率.通过项目引导构建循环农业产业联盟模式,分析循环农业模式能量流动特征,不仅有助于说明循环农业模式实施效果,也可为循环农业模式自身优化提供理论依据.

Emergy-value analysis on pattern of circular agriculture industry alliance in Changting County

[Background] Promoting soil fertilization is an important subject in Changting County for soil and water conservation.Aimed to reusing agricultural waste products and return to farmland,a pattern of circular agriculture industry alliance was established.[Methods] In order to evaluate the pattern application effectiveness and analyze the characteristics of energy flow in recycling agriculture model,the emergy yield ratio (EYR),emergy invest ratio (EIR),environmental loading ratio (ELR) and emergyvalue sustainable development index (ESI) in both of circular agriculture industry alliance and local agricultural system (CK) in Changting County were analyzed by emergy-value,with the emergy transformity referring to study of H.T.Odum.[Results] The EYR,EIR,ELR and ESI of circular agriculture industry alliance in Changting County in 2014 were 7.12,49.35,0.44 and 16.26,respectively.While the EYR,EIR,ELR and ESI of local agricultural system were 1.20,3.29,0.23,and 5.17,respectively.With production pattern changed from traditional one,the percentage of the renewable organic emergy (R1) to the total emergy input increased from 58.42％ to 66.47％,the percentage of the nonrenewable industrial auxiliary emergy (F) increased from 18.49％ to 30.32％,and percentage of renewable environmental resources (R) decreased from 22.95％ to 1.88％.For emergy output,two product systems were typed with heavy animal production,and their emergy outputs were above 75％ of total output.[Conclusions] Circular agriculture industry alliance pattern has obvious benefit on agriculture development with increasing 5.92 of EYR and 11.09 of ESI,it is greater than local agricultural system.It is suggested that optimization on circular agriculture industry alliance mode as following:1) making limitation on livestock production;2) enlarging scale of organic fertilizer production;3) introducing more vegetable plantation and orchard to join the alliance for using biogas;and 4) strengthening science and technology investment to make fully use of biogas and fermented liquid.