| Since economic reform and open up in China, the vegetable production scale becomes larger and larger, and the position of vegetable industry in agriculture becomes more and more important and vegetable industry of China is the largest production and trade country in the world. The vegetable sown area was only 4753 thousand hectares in 1985 and it was expanded to 18414 thousand hectares in 2009 which the annual average growth rate of vegetable sown area was 5.81%, and total vegetable yield was increased from 82.43 million tons in 1985 to 600.02 million tons in 2009 which the annual average rate of vegetable yield was 8.62%. Vegetable industry has been developed to the second largest plant industry which is only followed by the grain industry and the output value of vegetable industry was increased from 37.92 million yuan in 1987 to 880 million yuan in 2009. The sown area and the yield of vegetable industry in China has become the largest country in the world.With the rapid development of vegetable industry, the vegetable industry has changed from the planned economy to market economy and the vegetable production areas have appeared the trend of spatial concentration in China.The main appearance of the vegetable industry concentration are the first the concentration degrees of the sown area and the yield of vegetable are significant increased, respectively, the second the concentration trend of vegetable industry has changed from the expansion of the sown area and the yield of vegetable to the varieties specialization and the concentration of vegetable.With the development of the vegetable production area concentration, the competition among the vegetable production areas is intense and the competitive strategy has been changed from simply the expansion of the sown area and the yield of vegetable in the early period to the the improvement and the upgrade of vegetable variety. Since the competition among these vegetable production areas, the structure change of production area took place, the new production areas emerged, and the concentration tread of vegetable production in the space has been emerged. The high specialized and obvious characteristics of vegetable concentrated production areas have been formatted which is called the main production area.The influencing factors of the distribution and the change of agricultural production areas are natural condition, technology, market, transportation, capital and history condition and these factors together influence and determine the development path of agricultural production distribution, and this phenomenon has been proved by the studies of theorial and empirical.The concentration of agricultural production areas can promote the growth and the development of agricultural economy. One hand, the sepecializated distribution of agriculture can play each region comparative advantage and realized the reasonable distribution of resources which accelerate vegetable industry development and promote the agricultural economic growth.On the other hand, the concentration of agricultural production areas can promote the expansion of the agricultural industry, improve and agricultural industrial structure, drive the development of vegetable releted industry, and increase rural household income.This study is to take the vegetable industry as study object, study the status and the characteristics of the vegetable industry concentration in China, and then base on the theories of production area concentration and the formation of main production areas to analyze the influencing factors of the main vegetable production areas formation in China. This study futher employs the externality theory of industrial agglomeration to explore the economic effect of the formation of main vegetable production areas from two perspectives of the economic effect on the regional agricultural economic growth and county agricultural economic development, respectively. The results provide the new perspective to the future related theory study and policy formulation. This study is included nine chapters, and the detailed study contents and conclusions are as follows:Part1:the status and the characteristic of the concentration of vegetable production areas in China and the comparison with the U.S.A.This study employs the indexes of HHI, CRn, LQ, and K to measure the concentration degree and the regional specialization of vegetable industry in China and each production region. The results show that (1) the overall concentration degree of vegetable industry is low, but the vegetable production areas gradually transferred from the city to the suburbs, and from the scatter to the concentration, and the specialization level of vegetable production regions is high and the concentration of main vegetable production significantly appeared in county level. (2) the distribution of vegetable production layouts obvious regionalization and specialization in the U.S.A, the concentration degree of vegetable industry are higher than China's. (3)According to the comparison of different vegetable varieties between these two countries, the results show that the concentration degrees of each vegetable variety are higher in the U.S.A than China's and the change trends of different vegetable varieties production region distribution are different which five types exist, the first trend is the distribution from scatter production to high concentration, the second trend is the distribution from high concentration to scatter production, the third is the concentration degree is still high, the fourth trend is some vegetable varieties have no significant production concentration phenomenon, the last the new vegetable main production areas appear which the original vegetable main production areas have no change.According to the comparision, the main reasons of the specialized distribution of vegetable industry in the U.S.A are results from natural condition, technology advance, market demand and scale, transportation condition and government policies. These are valuable experimences for the vegetable development of China.Part2:the market sensitive analysis of the plant decision of vegetable growers in China.The panel date econometrics model is used to analyze the mechanism and the influencing factors of plant decision of vegetable growers in China in this chapter. The study results show that the plant decision of vegetable growers are significant positively influenced by the relative comparative revenues between vegetable and other crops, a great change of non-farm employment level in local region and the vegetable production decision-making of farmer households in the previous year.The study results are in accordance with this study theory anticipation and prove that vegetable growers can sensitively depend on the market information to adjust their plant decision, and futher influence vegetable production areas distribution in China, hence it is necessary to study the influencing factors of the formation of main vegetable production areas from perspective of the rural household.Part 3:the influencing factors of the formation of main vegetable production areas.This study first analyzes the influencing factors of the formation of the main vegetable production areas and decribes the differences of these influcening factors among different regions and then bases on the theories of production area concentration and the formation of main production areas and utilizes structural equation model to analyze the influencing factors of the formation of the main vegetable production areas which is from the perspective of rural households. The study results show that the influencing factors of the formation of main vegetable production areas are very complex. Factor endowment has a weak positive effect on the formation, technology, transportation, market demand and scale, knowledge spillover and government policies have a significant positive effect on the formation of the main vegetable production area. However, Furthermore, government policies have the greatest impact, market demand, scale, traffic, technology, knowledge spillover and factor endowment are followed afterwards and government policies also have a positive effect on knowledge spillover.Part 4:The role of the formation of main vegetable production areas on the regional agricultural economic growth.Based on the external theory of industrial agglomeration, the study employs the growth modle of agricultural economic to study the role of the formation of main vegetable production areas on the regional agricultural economic growth. The results show that the formation of main vegetable production areas has the significant positive role on regional vegetable economic growth. The formation of main vegetable production areas results in the increasing the inputs of production factors-labor, land and capital in vegetable production and changing the structure of regional agriculture and then promoting regional vegetable industrial economic growth. Hence the externality of formation of main vegetable production areas exists-technology spillovers which can promote the vegetable plant technology spread quickly and used widely, and then promote regional vegetable economic growth. Vegetable industry is one of main agriculture in main vegetable production areas and its output value has significant positive correlation on agricultural output value. The vegetable industry as one of the main agriculture in main vegetable production areas, the economic growth of vegetable industry has significant role to promote the local economic growth of agriculture.Part 5:the effect of formation of vegetable main production areas on the county agricultural economic development.This study is to take the shouguang as the study object and analyze the effect of the formation of vegetable main production areas on the agricultural economic development of county. The study results realed that (1) the concentration of vegetable production areas promotes the vegetable industry growth. (2) the formation of main vegetable production areas can bring the change of local agricultural industrial structure.and. (3) the formation of vegetable main production areas drives the development of the related industries..(4) the formation of vegetable main production areas can increase the income of rurual households.Through this study, this study proposes the following policy recommendations:Firstly, the distribution of agricultural products should be optimized which play regional comparative advantage and develop leading agricultural industry.Secondly, the investment of the science and the technology and the promotion and the service of agricultural science and technology should be increased.Thirdly, the construction of the infrastructure should be strengthened.Last, the environment of agricultural products market should be improved.
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