坡地赤红壤物理退化及其机理研究──Ⅱ.土壤水分性能退化特征

Studies on Physical Properties Degradation and Its Possible Mechanism of Latored Soil──Ⅱ.Studies on Characteristics of Soil Water Properties Degradation

探讨了坡地赤红壤水分性能退化的特征、结果表明，与地带性自然植被下坡地赤红壤比较，次生植被或人工植被下坡地赤红壤水分性能变劣：表现在导水性降低，2h饱和渗水量明显减少，自然赤红壤比耕型赤红壤的减幅大；持水能力下降，在同样吸力下，土壤持水量较少；供水能力下降，在同样吸力段，表土释放的水量较少；亚表土在低吸力段释放水量较少。

The paper dcals with the characteristics of water properties degradation in latored soils. It was showed that, compared with the latored soils under zonal natural vegetation, the ones under secondary or man-made vegetation were under deterioration of water properties.Results indicated that the water properties degradation in latored soils was characterized by lowering of water infiltration rate in surface layer, of available water-holding ability, being less holded available water Under the same suction; of water supplying ability, hoing less release water content under same suction for surface layer and under lower suction for subsurface layer.