Study on Siol Permeability of Different Altitude Gradient in the Upper Analysis of Bailong River
The soil of scrub vegetation types in the upper reaches of Bailong river in Gansu province was studied,the results showed that:(1) The average soil density,capillary porosity and non capillary porosity change greatly with the increasing of altitude gradient.The average density is between 0.85 g·cm-3 to 1.61 g·cm-3,the average soil density decreases gradually with the increase of altitude.But at an altitude of E (2 750-3 000 m),the average soil density is the largest and the soil density from 0 to 10 cm was smaller.Average porosity between 24.41％ to 66.22％,non-capillary porosity between 1.54％ to 12.81％,porosity and density were negatively correlated.(2) With the increase of altitude gradient capillary moisture capacity,maximum moisture capacity and minimum water-holding capacity first increases and then decreases in the altitude to E (2 750-3 000 m).The results were consistent with capillary porosity change;The drainage capacity decreases with the increase of the altitude gradient form 27.79 to 7.86 mm.(3) The initial infiltration rate,steady infiltration rate and the average permeability of the soils with different altitude gradient have great differences.The initial infiltration rate is between 2.02 to 20.90 mL·min-1 and the steady infiltration rate is between 0.35 mL·min-1 to 6.20 mL.min-1,the relationship betweenpermeability and time is in line with the power function regression equation Y=ax-b,the correlation coefficient reached a significant level.
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万方数据
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