用搜索法集成耕地分等与环境评估成果的研究

Integration of cultivated land quality grades and environmental assessment achievements by using searching method

在"耕地分等和地化评估成果应该集成"的前提下,针对集成过程中的权重确定问题,该文提出权重搜索法,以最小二乘法计算集成结果的误差,并通过分析误差的变化趋势,确定耕地利用等和耕地环境健康等的权重取值范围。其中,考虑到等级数量对误差变化的影响,在数据基础不变的前提下,改变等间距,设计了3种等级划分方案,进行集成和误差分析。最后,该文以吉林西部某县为研究区,对提出的方法进行了实地验证。结果表明,研究区域内耕地质量综合等级评价中,耕地利用等权重的合理取值范围为[0.7,0.9],采用不同的等级划分方案进行集成,集成成果能够反映区域耕地质量的分布状况。

On the premise of the necessity of integration of cultivated land quality grades and geochemical assessment achievements and aiming at the weights determination in the integration process,the searching method was put forward to determine weights value range of cultivated land utilizations and environmental health grades by analyzing the changes of errors.Considering the influences the grade numbers on the changes of errors,the equal interval was changed and three gradation projects were designed on the premise of unchanged data base,which aimed to the integration and analysis of errors.The method proposed was verified in a county of west part in Jilin Province.The results indicated that the reasonable value range of cultivated land utilization grades was [0.7,0.9].The integration achievements can reflect the distribution of cultivated land quality by using different gradation projects in the integrated evaluation of the cultivated land in the researching region.