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土类和亚类的划分应正确地把成土条件、成土过程和土壤属性三者结合起来,不能偏废或硬套.耕作土壤应以耕作熟化过程中产生的诊断层及其特性作为划分亚类或土属的依据.建立相应的土纲以划分地带性土壤;整理现定的57个土类和198个亚类,以达诊断分类的要求;正确划分土属以使高级和基层分类之间具有系统性和概括性.各级分类指标应尽量赋予量值,量值在野外必须可以观察,并且不易在短期内人为活动改变;不同分类级别的指标应以数量级加以区分;选择指标应有发生学上和实践上的意义.
Soil and sub-class division should correctly soil conditions, soil formation process and soil properties of the three together, can not be partial or curtailed farming soil should be plowing and maturation of the diagnostic layer and its characteristics as a division of Asia Class or soil based on the establishment of the corresponding soil to divide the soil zoning; 57 soil classes and 198 subcategories are scheduled to meet the requirements of the classification; the correct classification of the soil genus to the classification of senior and grassroots Systematic and generalized.At the same time, the classification index should be given as much as possible, the value must be observable in the field, and it is not easy to change the human activities in a short period of time.The indexes of different classification level should be distinguished by the order of magnitude. The selection index should have The academic and practical significance.