兴安落叶松原始林区降水化学输入的特征研究

Study of rainfall hydrochemical import characteristics in larix gmelini virgin forest

对寒温带大兴安岭根河落叶松原始林区降雨、林内雨化学因子观测研究结果表明,兴安落叶松原始林区输入的大量元素均低于国内其他重要林区,而微量元素含量接近平均水平。降雨通过林冠形成林内雨时表现出兴安落叶松林冠层对Na、Ca、Cu、Fe有一定的吸附作用,其中Ca的吸附作用表现明显。降雨通过林冠时淋溶出K、Mg、Zn、Mn、P,其中K淋溶量最高。生长季中降雨除Ca的变化较大外,其他大量元素和微量元素的月际变化均较小,5～9月份林内雨多数元素养分含量月际变化曲线呈“U”字型。

The hydrochemistry factors of rainfall and through-fall in the larix gmelini virgin forest of Genhe River of Daxinganling boreal zone were observed form 1995 to 1998.The results show that the macroelements of rainfall of hydro-chemical importing in Daxinganling virgin forest zone are less than the other main forest areas of China and microelements tend to balance; when the rainfall which passed canopy turned into through-fall,tree tops of larix gmelini effect on absorbing in Na,Ca,Cu,and Fe,especially Ca and the water drips out of K,Mg,Zn,Mn,and P,especially K; the macroelements and the microelements monthly changes are little except of Ca during growing periods.The monthly change curve of macroelements contain in the forest is 'U'.