阿什河上游小流域不同森林类型土壤水分时空分布

Temporal and spatial variation of soil water under different forest types in the upper reaches of Ashihe River

在阿什河上游光明沟小流域内,选取樟子松、红松、兴安落叶松、水曲柳及杂木林5种森林类型,采用传统土壤水分研究方法,研究不同森林类型间土壤水分时空分布特征。结果表明:除水曲柳林外,其他4种森林类型土壤含水量随土层深度增加而降低,为降低型;兴安落叶松林0～40 cm土层土壤含水量最大,为32.91%,其次为水曲柳林(28.79%)、杂木林(25.99%)、红松林(23.64%)和樟子松林(18.76%);各森林类型土壤含水量在生长季内大致上遵循高—低—高—低的规律,与降雨量间存在较一致的对应关系,森林对该小流域内土壤含水量起到了显著的调节作用。

The dynamics of soil water of 5 forest types（Pinus sylvestris var.mongolica,Pinus koraiensis,Larix gmelinii,Fraxinus mandshurica and mixed forest） in the upper reaches of Ashihe River were studied,using the traditional method.The results show that the soil water content under forest is obviously decreased with the depth except Fraxinus mandshurica.In the layer of 0-40 cm,the soil water content of Larix gmelinii,Fraxinus mandshurica,mixed forest,Pinus koraiensis and Pinus sylvestris var.mongolica was 32.91%,28.79%,25.99%,23.64%,18.76% respectively.The soil water content in the growth season follows the law of high-low-high-low,and changes along with precipitation.Forests play an important role in the dynamics of soil water content in the small watershed.