Eco-economical Characteristic Studies Of Several Compound System Modes In Mid-south Area In Loess Plateau

In this paper, the basic principles and methods of ecology and economics were applied to study the eco-economical characteristics of several compound system modes in four typical pilot areas of the central and southern Loess Plateau, which are Xipo village Chunhua county Xianyang City, Luochuan County Yan'an City, Nan'anshan Village and Beigou Village BaoTa district Yan'an City. We have done research on the model of test aeras from the general to the specific, and to the whole with the application of systematics and analysed operation condition and the coupling feauture of the subsystems of several typical compound system modes. The main research results are as follows:1. Economical benefit of typical complex system of Loess Plateau.We select wheat and corn planting patterns and Qinguan, Conmon orchards, fruit, livestock complex business model and fruit livestock marsh complex business model in several typical agricultural systems model for research. In the physical properties of soil, the moisture content of soil from good to bad is in the order of fruit livestock marsh, fruit livestock model, corn model, Qinguan, conmon orchards and wheat. As to the chemical properties of soil, the order is fruit animal model biogas, Qinguan mode, corn, fruit animal model, wheat, conmon orchard from big to small; As to the space aspect , the content of nitrogen and organic matter in soil from big to small is in the order of North Village, Beigou village, Nan'anshan Village, Xipo Village. The content of potassium in soil from big to small is in the order of Xipo Village, Nan'anshan Village, Gaopo Village, Beigou Village.2. Economic benefit analysis of each single business model.The results showed that the orchards had the best economic benefits, modest cash flow and had the maximum of the total revenue and the net income with better economic indicators. Livestock breeding model had big cash flow, short cycle and the economic efficiency is common. Wheat model had the minimal economic efficiency and cash flow.3. Economic benefit analysis of Composite (coupled) business model.The results showed that the fruit animal biogas business model achieved the purpose of the economic cycle with the maximum extent with fully consideration of their material and energy flow characteristics of respective systems. The total revenue and net income was far higher than that of fruit livestock business model and other models. The specific order from big to small is fruit animal model, fruit animal model, Qinguan, conmon orchard, corn, wheat.4.The analysis of the supply and demands in apple marketIt was shown that the total land supply had short-term rigidity and long-term of the limited flexibility by analysing the factors affecting the supply of Apple, but it did not exceed the total land area of agricultural utilization. The capital supply can not free flow with the constraints of the land management system and the separation of ownership and use right system. There has been a great development in the labor supply with the appearance of free labor market. Disastrous weather from time to time which can not be expected was the biggest factor affecting the supply of apple market. The analysis of market demand was mainly from three sources, which were the traditional fruit businessman import and export fruit businessman and apple processing enterprises. The ultimate demand was a consumer's preferences. To simplify in this study, research was carried on the dealers as a consumer. Traditional fruit businessman developed in tortuous. The rapid rise of import and export of fruit businessman and apple processing enterprises were replacing the traditional apple fruit businessman to become the main force in the primary consumption. The whole supply had a degree of long-term flexibility and short term rigidity constraining to all the major factors. Market demand was completely flexible with the fluctuations of sales prices.