对西藏色季拉山急尖长苞冷杉林不同海拔梯度土壤渗透性能进行综合评价,结果表明土壤渗透性能指标(稳渗速率、初渗速率、渗透总量、平均渗透速率)在同一海拔梯度不同土壤层次上均表现为随着土层深度的加深而逐渐减小的趋势,从不同海拔梯度看,4个入渗指标在3 700m处呈现最大值,而在4 200m处呈现最小值。经主成分分析,得到不同海拔高度不同土壤层次的入渗性能排序,从综合平均得分来看,不同海拔梯度急尖长苞冷杉林土壤渗透性能优劣顺序为3 900m>3 800m>4 200m>4 100m>4 000m>3 700m。土壤渗透指标与非毛管孔隙度、总孔隙度、土壤有机质含量显著或者极显著正相关,与其土壤容重呈极显著负相关,与土壤含水量无直接相关性,由此分析,建立土壤渗透性主导因子方程均达到极显著水平。研究结果可为该区域内水源涵养林建设和水土流失防治提供理论支撑。
Soil infiltration characteristics in Abies georgei var.smithii forest of Sygara Mountains in Tibet were comprehensively evaluated.Results showed that soil infiltration indicators(initial infiltration rates,steady-state infiltration rates,mean infiltration rates,the total penetration)had the gradually decreasing tendency as the increasing of soil depth in the same altitude.From the different elevations,the four soil infiltration indicators presented the maximum at the altitude of 3 700m,and the minimum at the altitude of 4200m.Through the principal component analysis(PCA),the order of soil infiltration performance was gained,which was 3 900m>3 800>4 200m>4 100m>4 000m>3 700m.The soil infiltration indicators were positively related with soil bulk density,had no relationship with soil moisture content.According to above analysis,the dominant factor equation of soil infiltration was established,which reached extremely significant level.
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