| With the increasing demand for agricultural products and the unregulated use of chemical resources such as fertilizers and pesticides,agricultural non-point source pollution,soil desertification,soil erosion and other phenomena are beginning to affect the domestic ecological environment security and social stability and development.Agricultural development is facing unprecedented challenges.The alpine region ecological environment is fragile,the level of agricultural development is relatively backward,and the circular agriculture progress is slow.In order to promote agricultural development and reduce agricultural pollution impact of the ecological environment,it is necessary that according to the local environmental climate to explore a new development model of alpine environment breeding and circulation.In this study,combined the alpine hilly region climate characteristics,based on the form of shed breeding,adjusted the agricultural production structure,and the agricultural production method was boldly renovated.The brand new circular agricultural development model was be constructed in the plateau hilly valley at the 3200m altitude.Explore the pigs stereo raise methods,save raised space and land costs,shorten the material and energy exchange distance in the system,reduce the agricultural waste pollution risk to the environment,organically combine planting,breeding and agricultural waste treatment,and promote the three Linkage coupling effect.Combined with the agroecology theory,establish an plateau agroecology evaluation index system,evaluate the economic,social and environmental benefits of the Plant-Rural-Recycling integrated shed model in the operation process,and judge its adaptability and sustainability in the plateau development and promotion significance.The soil nutrients analysis of the Plant-Rural-Recycling integrated shed model plateau region planting area revealed that the soil organic matter and nutrient content were low and the soil fertility was relatively poor.During the plateau agriculture development,it must pay attention to the supply of soil organic matter and nitrogen,control the supply and demand phosphorus balance,and ensure the safety of agricultural planting environment.Through the analysis of the organic fertilizer substitution rate,it is clarified that the feasibility and potential of using organic fertilizer to replace chemical fertilizer in the development of plateau agriculture.Material is the energy flow carrier and the agriculture operation basis.Analysis the organic carbon,nitrogen and phosphorus flow state in the Plant-Rural-Recycling integrated shed model,the breeding subsystem material flow of the input and output for the highest proportion.The feedback input/total input of organic carbon,nitrogen and phosphorus material flow in the system is high,and the system is more cyclic and sustainable.The materials waste generation rate is low in the system,and the materials effective utilization is high.The system converts input materials into feedback output and commodity output,which not only realizes the materials recycling,and effectively guarantees the materials economic benefits and realizes economic benefits and environment coordinated development.The Plant-Rural-Recycling integrated shed model has a high material circulation and material self-sufficiency,high material resources utilization degree,high economic benefits,and material elements to maintain a balanced and stable operation in the system.According the Plant-Rural-Recycling integrated shed model energy flow analysis,it is found that the piglets economic energy output is the main output of the model,accounting for55.0%,and the breeding subsystem non-economic energy output proportion is also relatively high,accounting the total non-economic energy output for 99.4%.While the breeding subsystem obtains greater economic benefits during operation,there is a huge energy waste.The fermentation system converts the breeding subsystem non-economic energy output into organic fertilizer and recycles nearly 45%of the breeding system energy wasted.The organic fertilizer economic energy output of accounts for 44.3%.The system energy production investment ratio is 1.169.The system while running has a certain energy surplus.The system energy cycle index is 0.764,the system has a high energy recycling degree.The system energy flow analysis shows that the Plant-Rural-Recycling integrated shed model is a plateau circular agriculture development model that stable operation,high energy recycling and strong sustainable development potential.The Plant-Rural-Recycling integrated shed model value flow analysis has an economic output ratio of 1.48 and a cost-profit ratio of around 47.89%.Model can get higher economic income.The model investment recovery period is 2.95 years,and the investment recovery period is short,which has strong anti-risk ability and promotion significance.According to the Plant-Rural-Recycling integrated shed model emergy analysis,it is found that renewable organic energy is the main system energy input method,and the emergy input amount is 1.686×1018sej,which accounts for 58.3%.The value has a greater impact on the input of the system non-renewable industrial auxiliary emergy.Through the emergy analysis,the Plant-Rural-Recycling integrated shed model is a high-output model with low dependence on the market,high potential for sustainable development,and low impact on the external environment.It can be highly adaptable and stable in development in plateau region,and can be promoted as a circular agricultural development typical case.The Plant-Rural-Recycling integrated shed model is an exploration that aimed circular agriculture in the alpine hilly areas.This model can provide a driving force for the river valley agriculture development in high-altitude areas,promote local agricultural development,mitigate the agricultural pollution impact of the local ecological environment,protect the local ecological environment;and through this model Case establish a typical project for the circular agriculture development in high cold regions.The model can fully coordinate social,environmental and economic relations,promote the alpine agriculture industrial structure transformation,promote the plateau area facility agriculture innovation,solve the plateau ecological environment pollution and destruction from the root cause,increase the local farmers income,and contribute to winning the local against poverty battle. |
