雅安山区耕地后备资源综合生产力评价

Evaluation of the Comprehensive Productivity of Reserved Cultivated Land in Mountainous Area in Ya'an City

针对雅安大相岭以南为亚热带湿润偏干季风气候区(汉源、石棉),以北为亚热带湿润季风气候区的气候特点,将雅安分为南部和北部两个亚区,从气候、土壤、灌溉、地形条件入手选择评价指标,并以不同灌溉条件的选择和海拔分级体现南北差异。采用层次分析法确定各评价因素权重,用指数和法计算各评价单元的综合分值,最后采用均匀内插法,进行分等定级。评价结果表明,雅安市耕地后备资源以三等和五等居多,其土壤类型以暗棕壤、沙黄泥土、淋溶紫色土、砖红紫色土为主。针对耕地后备资源特点,建议对耕地后备资源开发利用时,应根据后备资源质量等级及其限制条件,采用不同的开发手段;对有较严重限制因素的耕地后备资源,宜暂缓开发。

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 4 068.29 hm^2 in ya'an, and they are divided into five grades. 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, different measures should be taken according to different the class and the limited factors. Second, the cultivated reserved land resources seriously limited should be postponed.