不同林龄尾巨桉人工林地土壤物理性质及贮水能力研究

Study on Soil Physical Properties and Water Storage Capacity in Eucalyptus urophylla×E.grandis Plantations at Different Stand Ages

对比分析了5个林龄尾巨桉人工林地土壤物理性质及贮水能力的变化规律。结果表明：各林龄尾巨桉人工林地各层土壤容重均呈现随林龄增加先增大后减小的趋势,孔隙度随林龄增加有所增大,饱和持水量和田间持水量呈现随林龄增加先下降后增加的趋势。各林龄尾巨桉人工林地0-100cm土层的土壤最大贮水力排序为：7年生（585.39 t·hm^-2）〉3年生（582.93 t·hm^-2）〉5年生（580.41 t·hm^-2）〉1.5年生（570.99 t·hm^-2）〉1年生（570.63t·hm^-2）,土壤有效贮水力排序为：1.5年生（59.50 t·hm^-2）〉7年生（46.96 t·hm^-2）〉1年生（22.47 t·hm^-2）〉5年生（22.46 t·hm^-2）〉3年生（13.82 t·hm^-2）。

Variation in soil physical properties and water storage capacity under Eucalyptus urophylla×E.grandis plantations were compared at 5 different stand ages.Results showed that the soil bulk density of each layer increased at first,but then decreased as plantation age increased;soil porosity also increased with plantation age.Soil saturated water capacity and field moisture capacity had the trend of declining at first but then increasing with plantation age.Under eucalypt plantations,soil moisture storage capacity of the 0～100 cm layer varied with age as follows： 7 years（585.39 t·hm^-2）〉3 years（582.93 t·hm^-2）〉5 years（580.41 t·hm^-2）〉1.5 years（570.99 t·hm^-2）〉1 year（570.63 t·hm^-2）.Soil available moisture storage capacities varied as follows： 1.5 years（59.50 t·hm^-2）〉7 years（46.96 t·hm^-2） 〉 1 year（22.47 t·hm^-2）〉5 years（22.46 t·hm^-2）〉3 years（13.82 t·hm^-2）. 更多还原