重庆市四面山林地土壤水分入渗特性研究与评价

采用Spearman秩相关分析法与灰色关联度分析方法,对四面山几种不同林地土壤水分入渗特性进行了研究分析。结果表明,林地土壤容重、砂砾含量及非毛管孔隙度对土壤饱和导水率具有显著相关性。非毛管孔隙度、砂砾含量与土壤饱和导水率成正相关关系,土壤容重与土壤饱和导水率成负相关关系。选取土壤水分初渗速率、稳渗速率、入渗时间与累积入渗量4项参数进行灰关联评价。林地土壤水分入渗特性灰关联紧密相关程度依次为阔叶林(0.8031)>楠竹林(0.7869)>针阔混交林(0.4454)>针叶林(0.4039),阔叶林土壤在所研究的几种林地中具有较好的渗透性能。Horton水分渗透模型对各林地土壤水分入渗过程拟合的相关系数R值均大于0.950,对所研究的四面山林地土壤水分入渗过程具有良好的适用性。

Research and Evaluation on Infiltration Characteristic of Forest Soil in Simian Mountain of Chongqing

Spearman rank correlation analysis and grey relational grade analysis were used in the research for soil water infiltration characteristic of different forest lands in Simian Mountain.The results indicate that soil bulk density,the contents of grit and non-capillary porosity have significant correlations with soil saturated hydraulic conductivity.Non-capillary porosity and the contents of grit are positive correlated with soil saturated hydraulic conductivity.Soil bulk density is negative correlated with soil saturated hydraulic conductivity.Based on the initial infiltration rate,stable infiltration rate,infiltration time and cumulative infiltration which were the important parameters determining soil infiltration characteristic,the results from grey relational grade analysis show that the values of grey relational grade in different forest lands took turns as broadleaf forest(0.803 1)>P.pubescens forest(0.786 9)> mixed broadleaf-conifer forest(0.445 4)> coniferous forest(0.403 9).Broadleaf forest has the better infiltration capability between researched forest lands.The values of correlation coefficients which Horton infiltration model simulated in researched forest lands are more than 0.950,so it has good applicability for researched forestry soil infiltration processes in Simian Mountain.