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陕北桥山林区森林土壤的水分物理特征为：容重1．01～1．33g／cm3，总孔隙度49．6％～55．0％，孔隙比3．83～5．26，毛／饱0．797～0．842，有效含水量范围42．5～54.6mm，但因森林类型不同而有一定差异。以松林的土壤通透性较优，松栎林、杨林居中，栎林和桦林较差。但供水性能相当近似，潜在供水能力均属良好。栎林土壤涵蓄能力明显较大，松林和杨林较小。
The water physical characteristics of forest soil in Qiaoshan forest area of northern Shaanxi are as follows: bulk density 1.01-1.33g / cm3, total porosity 49.6% -55.0%, porosity 3.83-5.26, wool / full 0.797 ~ 0.842, effective water content range 42.5 ~ 54.6mm, but due to different types of forests there are some differences. The pine forest soil permeability is better, pine oak forest, Yanglin middle, oak forest and birch less. However, the water supply performance is quite similar and the potential water supply capacity is good. The soil storage capacity of oak forest was obviously larger, while the pine forest and Yang forest were smaller.