摘要
在不同林地土壤水分特征曲线测定的基础上，进行土壤水分有效性的分级。通过分析不同林分的持水、供水能力，并结合生长季中土壤水分的测定，确定了不同林地土壤水分有效性水平。研究结果表明：不同立地条件下的各层土壤水分特征曲线几乎重合、形状基本相似，无显著差异；天然次生林地土壤持水能力最高，其余依次为油松×刺槐、侧柏×刺槐、侧柏、油松、灌草地、刺槐；土壤的供水能力侧柏×刺槐〉次生林〉刺槐〉油松〉侧柏〉油松×刺槐〉灌草地，同一立地条件下底层土〉表层土；在7～10月期间，样地各土层均处于有效水范围内，0～80cm土层平均有效水储量为24．27～70．47mm。
Based on the soil moisture＇s measurement in different forest soil, soil humidity characteristic curves were detected in research area （western Loess Plateau, China）. With this curve, the soil moisture＇s validity groups were classified. After the analyzes of the ability of water holding, water supplying of different forest and combines the measurement of the soil moisture in growth season, the soil moisture＇s validity level in the different forest land are made out. The results shown that： （1）the soil humidity characteristic curves of each layer in the soil profile in different conditions（land use） are matched very well, and there is no significant difference; （2） the sequence （from strong to weak） of water holding ability in different forest soil is as follows： natural secondary forest,Pinus tabulaeformis CamXRobinia pseudoscacia L. , Robinia pseudoscacia L. × Platycladus orientalis, Platycladus orientalis , Pinus tabulaeformis Cam , grassland and shrub land , Robinia pseudoscacla L （3） on the aspect of the water supplying ability in different forest soil, the sequence from strong to weak is as follows. Robinia pseudoscacia L. × Platycladus orientalis, the secondary forest , Robinia pseudoscacia L. , Pinus tabulae f ormis Cam , Platycladus orientalis , Robinia pseudoscacia L.× Platycladus orientalis ,grassland and shrub land ; （4） under the same land use conditions , the soil water supplying ability of different layers in the profile is different, the ability of surface soil is smaller than that in deeper soil; （5） during July to October, soil moisture in each layer in the profile is in the range of valid water, the average amount of valid water is between 24.27-70.47 mm in 0-80 cm soil profile.
出处
《水土保持研究》
CSCD
北大核心
2006年第5期205-208,211,共5页
Research of Soil and Water Conservation
基金
国家"十五"攻关资助项目(2001BA510B0101)
973项目(2002CB111503)联合资助
