“种植-肉牛-有机肥-种植”模式氮磷投入产出模型的构建

Construction of input-output model of nitrogen and phosphorus of “planting system-beef cattle-organic fertilizer-cropping system” circular agriculture model

该文针对亚热带丘陵区的生态特征,构建了"种植-肉牛-有机肥-种植"农牧复合循环农业模式,包括种植系统、养殖系统、废弃物无害化处理系统和产品营销服务系统。为了探明"种植-肉牛-有机肥-种植"模式各子系统氮磷投入产出流向特征,基于投入产出模型理论构建了该模式氮磷投入产出模型,并对模型参数的计算方法进行定量化研究。以亚热带丘陵区长沙县金井镇循环农业示范基地为例对模式氮磷投入产出模型的构建进行实证研究,进行种植系统、养殖系统、废弃物无害化处理系统、产品营销服务系统的氮磷投入产出分析。结果表明,循环农业模式氮磷投入产出模型的构建,可以反映各子系统氮磷的中间使用和最终产品的投入产出流动状况,建立循环农业系统中氮磷在各类主要产品的生产和分配之间的平衡关系,研究成果不仅可为亚热带丘陵区农牧复合循环农业模式氮磷资源的高效利用提供科学参考,并且可为农牧生态系统氮磷循环元素平衡的机理研究提供理论依据。

According to the ecological characteristics of subtropical hilly region, “planting system-beef cattle-organic fertilizer-cropping system” circular agriculture model was constructed which including planting system, breeding system,waste harmless treatment system and product marketing service system. In order to reveal the characteristics of nitrogen and phosphorus flows in eachsubsystem ofcircular agriculture model,the Input-Output model of nitrogen and phosphorus was constructed that based on the input-output model theory, and determined the calculation method of model parameters. Take Jinjing town of Changsha county as an example, the results show that the established nitrogen and phosphorus Input-Output model can reflect the nitrogen and phosphorus flow of intermediate and final products in eachsubsystem ofcircular agriculture model and establish the balance of nitrogen and phosphorus between the production and distribution in main products of circular agriculture system. Theresearch findings can not only provide scientific reference for efficient utilization of nitrogen and phosphorus resources of agriculture and animal husbandry compound circular agriculture model but also provide theoretical basis for the study on the mechanism of nitrogen and phosphorus cycling in agriculture and animal husbandry ecological system.