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Research on Crops Virtual Water Flows in China

Author: ChenLiXin
Tutor: SunCaiZhi
School: Liaoning Normal University
Course: Physical Geography
Keywords: Virtual water flows Effects Analysis Formation Mechanism Maintenance mechanism Suitability assessment
CLC: TV213.4
Type: Master's thesis
Year: 2011
Downloads: 89
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Abstract

Water security and food security are major issues about the national economy and people's livelihood, has become the focus of attention of the world with the development of globalization, China's water security and food security issues. The concept of virtual water theory put forward a new idea to play an important role in the protection of water resources and food security. Its value is that it makes people realize that the exchange of water resources in the country or region can be realized through the trade of agricultural products, thereby slowing the pressure of water resources in water-scarce countries or regions, to protect their food security, improve global water use efficiency. In short, the virtual water and its theory has had an important impact on sustainable development of water resources research. Virtual water is a form of trade, food and water resources linked Therefore, based on the theory of virtual water, expand research on China's agricultural trade in virtual water flow. First determine the virtual water flow pattern of agricultural products in China, analysis of virtual water flows on different areas of resources, ecological and economic effects; Second, the formation mechanism of agricultural products virtual water flow pattern studies to identify the underlying fundamental driving factors China's agricultural products virtual water flow pattern maintenance mechanism, and explore; Finally, China's agricultural virtual water flow suitability evaluation. The study combined with China's actual situation, the virtual water flow system for agricultural products, and to reveal its role in the protection of water resources and food security, and has important theoretical value and practical significance. Quantification of virtual water achievements at home and abroad, and to determine the virtual water flow pattern of China's agricultural products, according to the data of domestic and foreign trade of agricultural products in China, to reveal its evolution. The results show that: virtual water flows regardless of international or inter-district agricultural products showed a tendency to expand. China's international agricultural total net virtual water imports increased from 11.71 billion m3 in 2000 to 79.85 billion m 3 of 2008, the average annual growth rate of 27.13%, mainly due to the rapid rise in soybean net imports; domestic eight secondary zone, the Huang-Huai-Hai, the Northeast, the middle and lower reaches of the Yangtze River is the net virtual water transferred out areas, southern China, southeast, north, northwest and southwest regions net virtual water transferred to the regions. From the point of view of the virtual allocation of water resources, China's agricultural virtual water flow to the agricultural products virtual water flow generated effects analysis, the results showed that: from the the virtual farmland resource allocation point of view, China's agricultural virtual water flow is reasonable; Reverse configuration of the water resources, it is unreasonable. Agricultural products on the basis of the virtual water flow patterns, and consider the impact of natural resource conditions, demographic factors, factors of economic development, national policy, and technological progress factors reveal the mechanism of the formation of Chinese agricultural products virtual water flow pattern. The results show that: the cultivated area of ??the northern region is 1.6 times that of the southern region, which is the direct cause of the flow pattern formation, and economic factors are the root cause of its formation, especially since the reform and opening up, the rapid economic development of the southern coastal areas to accelerate the formation of this flow pattern. Take full account of the country's economic, ecological security based on the combination of China's inter-district agricultural products virtual water by the water shortage in the northern region to the southern region of the water-rich flow objective reality, from improving the agricultural ecological compensation mechanism, the Agricultural Water Resources Assistance The four aspects of the strategy, inter-basin water transfer and the development of water-saving and efficient modern agriculture on water flow pattern of China's agricultural products virtual maintenance mechanism in depth. From agricultural production safety systems, support systems and water safety system into account, to build China's domestic agricultural virtual water flow suitability evaluation index system and projection pursuit method virtual water flow suitability of provincial-level administrative regions of agricultural products the degree of quantitative evaluation. The results show that: the degree of suitability in the the virtual water suitable outflow District, Jilin, Heilongjiang, Ningxia lowest suitability index, only 0.27; appropriate virtual water inflow area, Shanghai, Beijing and Tianjin, the highest suitability index order 0.77,0.71 and 0.69, Guangxi and Tibet lowest suitability index. China's agricultural suitability index virtual water flow classification, found high suitability of agricultural products virtual water flow outflow area is mainly located in the Northeast region, moderately suitable outflow area is mainly distributed in the southern North China and the Yangtze River Basin. High suitability inflow District in Shanghai, Beijing and other cities for typical medium suitability inflow area southeast coastal the low suitability inflow District mainly located in the southwestern region. Finally, it is pointed out that the virtual water studies currently there are still shortcomings, outlook and further expand the virtual water theory.

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