Estimate Of Intensive Cultivated Land Use Potential Based On Evaluation Of Natural Quality

With the rapid growth of the population, development of the society and economy, humans' demand of land is increasing. But the land supply, particularly the cultivated land supply is very limited. However since 1990s, the development speed of cities in our country is increasing rapidly, Civilization and industrialization have caused a sharp decrease of cultivated land. At the same time, our country is an excessively populous country, people's average possession of the cultivated land is less than 1/3 of the world average level, and even in this circumstance, our country's cultivated land is shrinking continuously, which have draw the whole world's far-ranging concern, the food demand safety problem has become a highly concerned issue. In this situation, the domestic scholars have been taken an in-depth research on protection of the cultivated land. The limitation of the cultivated land and the infinity of human demand determine that it is an inevitable trend of the development of social economics to use the cultivated land intensively.This paper then aims to solving the above-mentioned problems by adopting the way of intensive land use. Firstly, it elaborates the basis of intensive use of cultivated land in a theoretical way. Then this paper analyzes the current situation of the cultivated land in FengDu, and sets up the appraisal standard to evaluate the potential of intensive cultivated land use in SheTan, which is viewed as a typical area in FengDu. Chapter l,give definition to the relative ideals, reviews the relative theories and evolvement study. Chapter 2 introduces the background, purpose and meaning of the theme, the reason for choosing the target area, the research focus, the structure of this paper, and research methods. Chapter 3, there is a brief introduction toward the natural condition, population, economy and social development status of the research area. And the current situation of the cultivated land in the research area will be analyzed. Chapter 4 introduces the concept and methodology of land potential evaluation. It sets up a standard for evaluating land potential by adopting multivariate regression method and Delphi method. The quantitative classification management system of potential will be set up, and FengDu County will be judged accordingly. Chapter 5 adopts productivity as the evaluation standard of the intensive utilization of cultivated land, thus the potential of intensive utilization of land can be evaluated according to this standard. Chapter 6 is the conclusion part of this paper, which points out the innovative part of this paper as well as these statements that needs further exploration.This paper draws conclusions as follows according to the above mentioned research: (1) The cultivated land in FengDu County had been decreased by 8706.16hm~2 in total during year 1997 to 2004. 819.51hm~2 of land had been decreased during 1997 to 2001, which showed a relatively slow decreasing speed; while there was a sharp decrease of land by 7886.65hm~2 from 2002 to 2004. During 1997 to 2004, 851.82hm~2 of land had been increased due to the land development policy made out in the year 2000. Thus we can see that the speed of land increasing is far less than the speed of decreasing, and the backup resource of cultivation is very limited. The situation that we face about cultivated land is very fierce. The main method to utilize and protect cultivated land should be exploring potentials from cultivated land and intensive utilization of cultivated land. (2) Viewed from the potential of unit area, cultivated land that possesses the greatest potential should be Class I and II. It demonstrates that the better the natural condition of land is, the bigger the difference will be when different levels of intensive utilization is adopted. Then if the possibility of intensive utilization is greater, the potential of intensive utilization will be greater accordingly. (3) From the above mentioned evaluation results, we can draw the conclusion that the potentials of intensive utilization ranges from the greatest to the least should be Class II, III, IV,V, I, VI, VII. Among these classes, Class II, III and IV have relatively greater potentials, which show that cultivated land with highest potential in hilly ground is the land with large area and medium quality. This is different from the point of view that cultivated land with the best quality should have the highest potential in unit area. Therefore, if we want to achieve the utmost potential of intensive utilization of cultivated land, we should endeavor to improve the quality of cultivated land.