Study On The Advantage Regions Of Crop Farming In China And Their Arable Land Protection Tactics

Arable land protection as a national policy of china, hasn't gained satisfied result for the past decades years, one of the most important reasons is that performance force was shared with all over the country. Thus, it has been emphasized as a basic academic viewpoint and tactic that arable land protection should be strongly carried out in advantage regions of crop farming (ARCF). Information Content Method (ICM) was applied to estimate regional advantage degree of crop farming on the county scale level, which is reflected by the total information content (TIC) of each evaluated unit. The advantage regions of seven main crops were distinguished and divided from the TIC, and their formation and evolvement were studied in terms of TIC change. Furthermore, the close relationship between these regions and crop farming distributions was discussed in detail. All above researches attempt to answer some public concerned questions such as why, where and how arable land should be protected, and provide governments with some consultations about advantage regions development, structural adjustment and rational distribution of crop farming. Some major conclusions are as follows:Firstly, ICM can be used to assess regional advantage degree of crop farming after some key techniques are resolved, for example, index system, variable grade, sample choice, TIC calculation, variables and their information contents assemblage.Secondly, the assessment units are correspondingly classified into three types, that is, advantage units, weak units and disadvantage units according to regional advantage degree of crop farming. There are three rice advantage regions, which are Middle and Lower Reaches of Yangtze River (MLRYR), Southeast Coastal of China (SECC) and Sichuan Basin (SCB). Three wheat advantage regions exist in Huanghuaihai (HHH), MLRYR and SCB. Four corn advantage regions located in Northeast China (NEC), Great Wall Zone (GWZ), Southwest China (SWC) and Xinjiang. NEC, GWZ and SWC advantage regions belong to soy bean crop, potato and yam crop, but their realm and geographic locations are not completely overlapped. Three cotton advantage regions lie in Northwest China (NWC), HHH and MLRYR. There are four oil crop advantage regions named Northern China (NC), MLRYR. SCB and SECC.Thirdly, the leading, active and restrict factors affecting formation of ARCF are distinguished from majority variables and their information contents assemblage. Frequently, the leading factors are sow area, yield per unit, valid irrigation rate, water supply ability of agriculture, land potential. It is illustrated by the mean information contents that the advantage degrees are strengthen and the amount of advantage units is increasing in ARCF.The fourth, ARCF result in agglomeration of crop farming and northern part of China has become the center of crop production. On the other hand, distribution changes of crop farming also promote occurrence of new ARCF.Finally, there are seven key regions of arable land protection, which are also major ARCF and named respectively Northeast Region, Great Wall Region, Huanghuaihai Region, Northwest Region, Middle and Lower Reaches of Yangtze River, Southwest Region and Southeast Region. For the last decade years, arable land has decreased 8.9453 million acres and change rate has reached-9.62 percent in the above seven major ARCF. Some arable land protection tactics and measures are drawn up according to Grey Relevance Analysis. The most important suggestions include exploring regional economic compensation mechanism, maintaining the advantage of ARCF in adjusting industrial structure, fully supplying and efficiently using water and land resources and promoting agro-modernization.