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层状土壤是普遍存在的一种土壤结构,提取出表征土壤层次的关键因子有助于简单准确地划分土壤的层次。在河南省新乡农田挖掘了实测剖面(160 cm厚),通过野外观测和室内分析,获取了土壤质地,以及容重、饱和含水量、饱和导水率、滞留含水量和非毛管孔隙度等土壤水分运动因子的取值。通过对这些因子进行特征分析、系统聚类分析和主成分分析,将土壤分成0~50 cm、50~80 cm、80~140 cm和140~160 cm四个基本层次,得到滞留含水量>饱和含水量>饱和导水率>土壤容重>非毛管孔隙度的土壤分层因子的重要性次序并验证了文中分层方法具有鲁棒性(Robust)。这些结果将为土壤水分运动模拟提供科学依据。
Layered soils are ubiquitous soil structures. Extracting the key factors that characterize soil gradients is helpful for the simple and accurate classification of soils. The measured profile (160 cm thick) was excavated in Xinxiang farmland in Henan Province. The soil texture, soil bulk density, saturated water content, saturated hydraulic conductivity, retained water content and non-capillary porosity were obtained by field observation and laboratory analysis. Exercise factor value. By analyzing the characteristics of these factors, cluster analysis and principal component analysis, the soil was divided into four basic levels of 0 ~ 50 cm, 50 ~ 80 cm, 80 ~ 140 cm and 140 ~ 160 cm, Moisture content> Saturated hydraulic conductivity> Soil bulk density> Order of importance of soil stratification factors for non-capillary porosity and verify that the stratification method is Robust. These results will provide a scientific basis for soil water movement simulation.