Evaluation Of The Comprehensive Productivity Of Reserved Cultivated Land In Mountainous Area In Ya'an City

Ya'an is located in subtropic humid monsoon climate. For special geographic environments and complicated landform, the character of the climate in ya'an is subtropic humid monsoon climate in the north of the da xiang mountain and subtropic xerothermic river valley climate in the south of da xiang mountain, ya'an city is divided into two investigations (one is north, the other is south) based on fully analysis of climate in ya'an city. The paper has chosen evaluation indexes which were based on four aspects: climate, soil, irrigation and terrain. The difference between the north and the south has fully reflected upon the choice of irrigation index and the classifications of altitude. The paper has chosen AHP to fix on the weight of the indexes, the index summation to sum the grades of each evaluation unit, at last well-proportioned interpolation method to determine the grade. The results are as following: there are gross reserved cultivated reserved land resources 4068.29 hm2 in ya'an, and they are divided into five grades. There are 43.03 hm2 which is the first class, 759.83 hm2 the second, 1599.71 hm2 the third, 430.14 hm2 the fourth, 1235.59 hm2 the fifth, respectively 1.06%, 18.68%, 39.32%, 10.57%, 30.37% are the proportions of different classes reserved cultivated reserved land resources 0 There are 700.51 hm2which is state cultivated reserved land resources, and 3367.79 hm2 is collective. In general, the cultivated reserved land resources mainly belong to 3rd and 5th classes, the types of soil are mainly dim brown soil, sand yellow soil, elevated purple soil, brick red purple soil. Two suggestions aimed at the character of the cultivated reserved land resources were put forward. First, we should increase the fund to exploit the cultivated reserved land resources and exercise engineering and biology measures. Second, the cultivated reserved land resources seriously limited should be postponed.