Spatial And Temporal Variations Of Arable Land Resource And Its Influence On Grain Productivity In Fukang City

Grain is not only an important commodity in people's lives, but also a strategic resource concerning social stability. So the safety for grain is very crucial. Arable land not only provides the necessary space for food productivity, but its natural number and quality also deeply affect the fluctuation of food production. The paper mainly analyzes changes of grain yield and its core part from the perspective of the change of cultivated land resources, and estimates the coordinated development trends between food production and arable land utilization. Based on changes in grain production, some countermeasures and suggestions for the rational use of arable land are proposed.Spatial and temporal variations of arable land in Fukang City are discussed by comparing and analyzing the spatial distribution of arable land quantity and quality of different-level arable lands in two periods. According to the results, the number of cultivated land as a whole showed rapid growth trend during the eleven years, and the net amount of cultivated land in Fukang City increased 12333.31 hm2. Quality of arable land standards had been improved, which mainly showed that the gradual changes of quality structure of cultivated area. On the whole, it was still in a low level. Quality of grade-one land in the Jianbian area declined slightly, the number of grade-two cultivated land had increased obviously, and the proportion of three-and four- grade arable land all reduced. In Tubian District, increased cultivated land was far more than the losing land in quantity, and quality levels of the new were mainly in grade two or three.Based on spatial- temporal dynamic changes of regional cultivated land resources, “food production model” is used to estimate the impact of arable land resources changes on food production, and change trend and characteristics of core part of arable land resources and food production are analyzed by using “core part transition model”, having revealing intrinsic links between changes of arable land resources and food production variations. The results showed that, the core part of arable land in the city migrated to the southeast 11.67 km during 2003-2013 and the total net amount increased 12333.31 hm2, while the core part of food production shifted to the east 0.94 km, during which the net food production in the whole city increased 134208.68 t.There is a relatively close relationship between arable land utilization and regional food security. The coupling coordination model is established to discuss the coordination development degree and changing trends between them. The results showed that the arable land utilization index as a whole represented a fluctuating upward trend. The level of food security was less volatile during 2003-2006; and after 2006, it showed a gradual upward trend, but the increase in food production was less than arable land utilization. The coordination state between arable land and food production was gradually improved from mild disorder to the general coordination. With the rise of coupling coordination degrees, the overall synergies of them presented a good development trend. Their level of development was not synchronized, and the level of food production security was still lagging behind the development and use of arable land to varying degrees during the current phase.