【摘要】 土壤质量指标是耕地分等指标的重要组成部分。耕地分等中土壤指标的选择应该遵循稳定性、空间变异性、主导性、生产性原则。主成分分析、相关分析、土壤特性响应时间、变异系数等方法是选取耕地分等指标的科学定量方法 ,但最有效的耕地分等指标体系选取方法应根据土壤学研究成果和生产实践经验。而指数和方法是综合评价耕地等级的有效方法。更多还原

【Abstract】 Soil quality criteria are the most important bases for farmland grading. According to principles and methods of selecting indicators, introduced in this paper, it is pointed out that relatively stable characteristics of soil are usually used as criteria of farmland grading. Although mathematics methods, such as Main Component Analysis, Correlation Analysis, Variability Analysis, and Responding Duration Analysis of soil properties, are widely applied to select indicators for farmland grading, practical experiences as well as research results from soil science is proved to be the most effective way. Furthermore, method of summing the selected indicators’ values is the reliable criterion for farmland grading.更多还原