Huzhou Sangji Fish Pond System Management Model Evaluation And Selection

Huzhou Mulberry-dyke and Fish-pond System is a unique way to use the lowlying land and the ecological agriculture model by combining mulberry,fish pond,and silkworm subsystems effectively.As a symbol of Chinese traditional culture from ancestors,Huzhou Mulberry-dyke and Fish-pond System can reduce or even avoid the effects of natural disastors,such as floods.Besides,each of the subsystems could provide material and energy to another to reduce production input and increase output.Thus,Huzhou Mulberry-dyke and Fish-pond System has been designated as one of the Globally Important Agricultural Heritage Systems and National Important Agricultural Heritage Systems respectively,with rich wealth in ecology,economics,society,culture,scientific research,demonstration,education and other aspects.And it is proved that the system is beneficial to promote sustainable and harmonious development between human and nature,which caters to the new era background of our country.Huzhou Mulberry-dyke and Fish-pond System formed from the unique natural environment and the superior social conditions.It has also evolved many different models of management with economic development and social change.In recent years,a series of problems have been presented driven by farmers' benefit mechanism,such as extensive management,imbalance of the ratio between land and pond.Thus this paper will make quantitative analysis on two main models of mulberry-silkworm-fish and rape-fish.Based on the current status and issues,two patterns of mulberrysilkworm-fish-mushroom and rape-fish-Hu Sheep are developed to adapt to the economic development and ecological protection to achieve optimization.Based on the emergy theory and method,the systems and related subsystems were analyzed,the research evaluates and chooses different models of Huzhou Mulberrydyke and Fish-pond System.The main contents of the study are as follows:1)This paper makes an analysis on both the natural geographical environment and social economic conditions of Huzhou Mulberry-dyke and Fish-pond System.Then examine the process of its formation and evolution.2)The existing models of mulberry-silkworm-fish and rape-fish will be evaluated systematically and split into several subsystems.The emergy flows and emergy structures of mulberry,silkworm,fish,rape,Hu Sheep and mushroom are analyzed.3)Considering the local reality and the level of economic development,the subsystems of mushroom and Hu Sheep will be introduced.Thus two new management models,mulberry-silkworm-fish-stropharia and rape-fish-Hu Sheep are combined and analyzed from the aspects of system structure,energy flows and emergy structure.4)Based on the input and output of four patterns,make further comparisons among the present and new models.Then the differences of sustainability,ecosystem stability and economic benefits of the new models and the existing models were appeared.It is intimated that,mulberry-silkworm-fish-stropharia model is better than that of mulberry-silkworm-fish model,and rape-fish-Hu Sheep model is better than the rapefish model.But the option of mulberry-silkworm-fish-stropharia and rape-fish-Hu Sheep depends on the local situation and other factors.Furthermore,this research puts forward the countermeasures to protect and develop the system.First of all,it is necessary to protect non-renewable environmental resources and improve ecological efficiency.Secondly,optimizing the input structure of artificial auxiliary energy to increase economic benefit.Thirdly,the emergy output of the system is balanced to improve the overall stability.Finally,establishing and improving agricultural technology system,and the government offers technical services and guidance during production.