%0 Journal Article
%T The Changes of Grain Output Center of Gravity and Its Driving Forces in China since 1990<br>1990年至2005年中国粮食产量重心演进格局及其驱动机制
%A WANG Jieyong
%A LIU Yansui
%A <br>王介勇
%A 刘彦随
%J 资源科学
%D 2009
%I 
%X Grain security is a considerable challenge to the world in the 21 century, especially to China. The pattern of grain-output has changed greatly since the reform of the grain market, the accelerating urbanization and fast industrialization. In this paper, the model for the center of gravity of grain-output was built, and the change of grain-output pattern was analyzed from 1990 to 2005 with the model. The results showed that: 1) from 1990 to 1998, the grain-output center-of-gravity moved towards northeast at the speed of 7.6 km/year. In total, it moved 60.8km northward and 6.4km eastward; 2) In the period of 1998 to 2003, the grain-output center-of-gravity moved towards southwest at a speed of 16 km/year. Therefore, it moved 63.8km southward and 48.1km westward in all; 3) In the last period of 2003 to 2005, the grain-output center-of-gravity moved back to northeast at the speed odf 41.2 km/year. In other words, it moved 82.3 km northward and 46.8km eastward in all; 4) During the entire period of 1990 to 2005, the grain-output center-of-gravity moved remarkably from the south and east to the north and west of China, and the moving speed of grain-output center-of-gravity was increasing. Therefore, it can be summarized that the regional grain growth was unbalance, and the spatial patterns of the advantageous regions of grain-output were unstable. The driving mechanism for the changes of grain-output center-of-gravity was discussed from different aspects, including resources, economy, technology, and relative policies. Firstly, the movement of grain-output center-of-gravity was based on the spatial pattern of farmland and its changing tendency. Secondly, the key factor for the changes of grain output center-of-gravity is the development and utilization of groundwater in north China, while the direct cause for it is the adjustment of food consumption structure. Thirdly, the technology advancement, the imbalanced development of rural economy, and regional policies to support grain production are the driving forces for the movement of grain-output center-of-gravity since 1990. In the end, the effects of such change or movement were discussed. The changes of grain-output center-of-gravity have aggravated droughts in north China, reduced the agricultural land-use productivity, worsened the imbalance of regional economy, and altered the commercial flows of grain products.
%K Grain security
%K Grain-output center of gravity
%K Driving force
%K Effects<br>粮食安全
%K 粮食产量重心
%K 驱动机制
%K 区域效应
%K 中国
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=B5EDD921F3D863E289B22F36E70174A7007B5F5E43D63598017D41BB67247657&cid=B47B31F6349F979B&jid=9DEEAF23637E6E9539AD99BE6ABAB2B3&aid=224CED5C10156307C2474E39421819F4&yid=DE12191FBD62783C&vid=4AD960B5AD2D111A&iid=DF92D298D3FF1E6E&sid=DA7365F2D81A3FCE&eid=1805714CB338690A&journal_id=1007-7588&journal_name=资源科学&referenced_num=6&reference_num=9