小陇山林区主要林分类型森林土壤持水能力研究

以小陇山林区阔叶混交林、锐齿栎林、日本落叶松林和针阔混交林4种主要林分类型森林土壤为研究对象,对不同林分类型森林土壤持水特性进行了研究.结果表明:各林分类型森林土壤容重变化在1.28～1.44g/cm3之间,排序为:阔叶混交林>日本落叶松>针阔混交林>锐齿栎林;土壤总孔隙度变化在45.82%～51.7%之间,排序为:锐齿栎林>针阔混交林>阔叶混交林>日本落叶松;各林分类型土壤最大持水量及非毛管持水量随着土壤深度的增加,都呈现递减趋势.土壤最大持水量排序为:锐齿栎林>针阔混交林>阔叶混交林>日本落叶松,非毛管持水量排序为针阔混交林>阔叶混交林>锐齿栎林>日本落叶松;各林分类型森林土壤最大持水量均值为2 801.0t/hm2,有效持水量均值为872.3t/hm2.林区森林土壤有效持水量均值低于1 000t/hm2,仅相当于87.2mm的降水,表明小陇山林区森林土壤持水能力较弱.

Study on water holding capacity of main forest types in Xiaolongshan forest region

The forest soil of broadleaved mixed forest,Quercus aliena var.acuteserrata forest,Larix kaempferi forest and mixed conifer and broadleaved forest in Xiaolongshan forest region were taken as the research objects,and the water-holding capacities of these soils were studied.The results showed as follows:the soil bulk densities were ranged from 1.28 g/cm3 to 1.44 g/cm3,the total soil porosities were from 45.82% to 51.7%.The maximum water holding capacity and non-capillary water holding capacity decreased with the increasing of soil depth.The mean maximum water holding capacity was 2801.0 t/hm2 and available water holding capacity was 872.3 t/hm2.The available water holding capacity was less than 1 000 t/hm2,and it was just equivalent to 87.2 mm precipitation.The results indicated that the water-holding capacity of forest soil in Xiaolongshan forest region was poor.