| In recent years,the scale of pig breeding in China has increased rapidly,and caused serious environmental pollution problems.Pig breeding waste has the dual attributes of pollutants and inputs,and the waste which disposed afterwards can generate a variety of economic benefits through resource utilization.Therefore,promoting the utilization of pig breeding waste resources is the fundamental way to solve the problem of pollution in pig breeding.Choosing a model suitable for the regional environmental carrying capacity and the characteristics of the farm itself is the key to promote the utilization of waste resources effectively.The choice of pig breeding waste management model must take into account important factors such as management cost,breeding scale and livestock and poultry breeding environment carrying capacity,in order to achieve a win-win situation in economy and environment.In this paper,through field investigations on 120 large-scale pig farms in Guangdong province,This paper mainly want to investigate how the factors such as management cost,farming scale and regional livestock carrying capacity affect the choice of the three types of pig breeding waste management model,which are energy ecotype,energy environmental protection type and high-bed fermentation type.First,This paper choose the cost-effective ratio analysis method to compare the economic benefits of different models,and the regional heterogeneity of the carrying capacity of livestock and poultry farming environments in Guangdong.Second,on this basis,a binary logistic regression model is constructed.This paper mainly use quantitative analyze to investigate the influence of factors such as pig farming management cost,farming scale and regional environmental carrying capacity on the choice of pig farming waste management mode,and put forward the ideas and methods of the management mode selection;finally,This paper put the method of the management mode selection in empirical application in Guangdong 20 cities(except Shenzhen)and 110 counties.and give the best management model on pig breeding waste in each county.The main research conclusions of this paper are as follows: First,the economic benefits of different pig breeding waste management models show significant differences.Among them,the high-bed fermentation type is the highest,the energy ecological type is the second,and the energy and environmental protection type is the worst;second,the livestock and poultry breeding environmental carrying capacity shows significant regional heterogeneity in Guangdong: the livestock and poultry breeding in Zhaoqing,Zhanjiang and Shaoguan is high,while in Dongguan and Shenzhen the result is relatively low;Third,empirical research shows that there is a significant relationship among management cost,farming scale,regional livestock carrying capacity and choice of pig breeding waste management mode;for every 1% increase in breeding scale,the selection probability of energy and environmental protection governance mode increases by an average of 18.4percentage points;for every 10 yuan increase in net governance cost,the selection probability of energy and environmental protection governance mode increases by an average of 5.4 percentage points;for every 1% increase in the carrying capacity of livestock and poultry farming,the probability of selecting an energy-friendly governance model increases by an average of 38.4 percentage points;The fourth is constructing a choice path for the management of breeding waste management mode and apply it to counties and cities in Guangdong Province to find the best breeding waste management model for different types of farms in different regions.For example,as for Zhanjiang City,the pig farms with less than 10,000 pigs,Chikan,Xiashan,Potou,Mazhang and other areas should adopt the energy and environmental protection waste management model.Xuwen,Leizhou,Suixi and Lianjiang should adopt the energy ecological waste management model. |
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