广东丘陵红壤土壤水分性能特征比较研究

Comparison of Soil Water Properties of Hilly Red Soils in Guangdong

对不同植被、不同利用方式下广东丘陵红壤水分性能进行了比较研究。结果表明,与自然地带性植被下的赤红壤比较,次生植被、人工植被下红壤类土壤导水性、持水能力和供水能力一般均较低。在同样的吸力下,次生植被、人工植被下红壤类土壤持水量较少,在同样吸力段,土壤释放的水量较少。玄武岩砖红壤持水量较大,但土壤水分有效性低。研究表明,广东丘陵旱地土壤局部干旱的发生,与其本身的土壤水分性能有密切关系,改良土壤水分性状,是调控广东丘陵旱地土壤水分的重要环节。

In this paper,the characteristics of soil water properties under different vegetation and use types were studied. The results showed that,compared with the latored soils under zonal natural vegetation,soil water properties under secondary or man-made vegetation ware characterized by lower in water infiltration rate,in water -holding ability （being less in holding water under the same suction） and in water supplying ability （being less in released water content under same suction）;soil water properties of basalt latosol was characterized by higher in water-holding ability,but lower in water infiltration rate and water supplying ability. Above results indicated that,the local drought stress in the hilly red soils was closely related to their water properties,reclamation of soil water properties may be one of important key part in water regulation of hilly red soils in Guangdong.