桉林-砖红壤水分性能特征研究

Latosol water properties characteristics under Eucalyplus in Leizhou Peninsula

根据室内测定资料,对雷州半岛桉林地砖红壤水分性能进行了探讨。结果表明,与自然植被下的砂页岩赤红壤比较,浅海沉积物桉林-砖红壤导水性、持水能力及供水能力均较低。在同样的吸力下,土壤持水量较少,在同样的吸力段,土壤释放的水量较少;玄武岩桉林-砖红壤持水能力较高,但导水性和供水能力较低。通径分析结果表明,浅海沉积物桉林-砖红壤持水能力较低主要受粘粒较少影响,其水分的有效性较低主要与其有机质的较少有较大关系;玄武岩桉林-砖红壤持水能力较高而水分的有效性较低,主要受其粘粒含量较高、有机质含量较低的制约。

The primarily study on soil water properties of latosol under Eucalyplus in Leizhou Peninsula was discussed. It was showed that, compared with the latored soils under zonal natural vegetation, soil water properties of neritic sedimentary latosol under Eucalyplu was characterized by lower in water infiltration rate , in water-holding ability (being less in holded water under the same suction ),in water supplying ability (being less in released water content under same suction); soil water properties of basalt latosol under Eucalyplu was characterized by higher in water-holding ability, but lower in water infiltration rate and water supplying ability. It was found that by path analysis, that the lower in clay and l OM. content might be the main interior factors leading to lower water-holding ability and lower water supplying ability respectively for neritic sedimentary latosol under Eucalyplu; that higher water-holding ability but lower water supplying ability in basalt latosol might be mainly caused by higher clay content and lower OM. Content for basalt latosol .