甘肃小陇山林区不同森林类型土壤水分动态

摘要

Five kinds of forest soil of oak and broad leaved mixed forest,Quercus aliena var.acuteserrata forest,Larix kaempferi forest,Pinus tabulaeformis forest and non-forest land were investigated in Xiaolong Mountain region.Soil water dynamics variation law of different forest types were studied through nine plot observations of the soil moisture in 2011.The results showed that atmospheric precipitation and evapotranspiration are main factors for the change of soil moisture.The seasonal variation of soil moisture content is clear.The effect of slope position on soil moisture for different forest types is not significant.There is significant difference in the soil moisture content of different soil layer (H).At 0 ≤H＜20 cm,the change of soil moisture content is severe.On the whole,the soil moisture content at 0≤H＜20 cm is higher than that at 20≤H＜60 cm layer.Broad leaved mixed forest and Q.aliena var.acuteserrata forest have higher soil moisture content with strong soil and water conservation ability and significant water conservation function.%以小陇山林区栎类阔叶混交林、锐齿栎林、日本落叶松林、油松林及无林地5种森林土壤为研究对象,通过2011年对9个样点土壤水分长期定位观测,研究不同森林类型土壤水分动态变化规律.结果表明:大气降水和蒸散量是引起土壤含水量变化的主要因素,土壤含水量季节性变化趋势十分明显;坡位对林区不同森林类型土壤含水量无显著影响；不同层次土壤含水量差异显著,土层深(H)O≤H＜20 cm的土壤含水量变化较为剧烈,但总体上其含水量大于20 cm≤H＜60 cm的土壤含水量;各个时期阔叶混交林、锐齿栎林土壤平均含水量较高,具有较强水土保持能力和显著水源涵养作用.