基于《耕地质量等级》的靖远县耕地质量等级评价

Jingyuan County Based on ‘cultivated landquality grade’ (GB/T33469-2016)

摘要:

基于《耕地质量等级》标准,按照黄土高原区耕地质量等级评定指标体系,利用县域耕地资源管理信息系统建立耕地质量等级信息系统数据库,运用空间分析、层次分析、模糊数学和综合指数等方法对靖远县耕地质量等级进行综合评价。结果表明:靖远县耕地受地貌、地形和水文地质条件影响等级高低出现了明显的区域分布规律,从北到南,依次为十等地到三等地,面积占比分别为1.51%、23.51%、41.55%、15.92%、10.31%、3.87%、2.34%、0.99%。耕地质量平均等级为7.64等,耕地主要利用类型由旱地和砂田逐渐向菜地和水田过渡。全县耕地土壤有机质、有效磷、速效钾平均含量为11.41g/kg、16.55mg/kg、178.03mg/kg,均属于中等水平。全氮为0.70 g/kg,属于低等水平。该评价较准确地反映了靖远县耕地质量等级现状,可对耕地质量的监测和保护提供了参考依据。

Abstract:

According to the evaluation result of cultivated land quality grade of Jingyuan County,this study aim to evaluate the cultivated land quality grade of Jingyuan County and discuss the countermeasures of cultivated land fertility protection and quality improvement.According to the "Cultivated Land Quality Grade" and the cultivated land quality grade evaluation index system of the Loess Plateau,the county-level cultivated land resource management information system was used to establish the cultivated land quality grade information system database,and the quality grade of cultivated land in Jingyuan County was evaluated by means of spatial analysis,analytic hierarchy analysis,fuzzy mathematics,and comprehensive index.The cultivated land in Jingyuan County was affected by the geomorphology,topography and hydrogeological conditions and had obvious regional distribution rule.From north to south,tenth-grade land to third-grade land in turn,the areas accounted for 1.51%,23.51%,41.55%,15.92%,10.31%,3.87%,2.34%,and 0.99%,respectively..The average grade of cultivated land quality was 7.64,and the main utilization types of cultivated land were gradually changed from dry land and sand field to vegetable land and paddy field.The average content of organic matter,available phosphorus,and available potassium in the county was 11.41 g/kg,16.55 mg/kg,178.03 mg/kg,all of which were of medium level.Total nitrogen was 0.70 g/kg,which was a low level.The evaluation relatively accurately reflected the current status of cultivated land quality grade in Jingyuan County.Based on the cultivated land quality issues,a reasonable analysis can provide a reference for the monitoring and protection of cultivated land quality.