兴安落叶松人工林土壤酸度的研究

Soil acidity of Larix gmelini plantation.

该文研究了落叶松 (Larixgmelini)人工林土壤酸度动态问题 .选择 7,1 3,2 5 ,37年生林分设置固定标准地 ,在生长季内定期取样 ,测定土壤的理化性质 .结果表明 :落叶松人工林的凋落物为微酸性或酸性 ,pH值 6 0左右 ;矿质层土壤酸度没有增大的趋势 ,活性酸度 pH值 6 0左右 ;土壤阳离子交换量为 2 0～ 40cmol/kg ,盐基饱和度80 %以上 ,钙离子交换量为 1 3～ 2 7cmol/kg ,以胡敏酸为主的腐殖质含量在 3%以上 ;暗棕壤具有较高的缓冲性能 。

The paper studies on the soil acidity dynamics of larch plantation( Larix gmelini )in eastern mountains of northeast China. The standard plots were selected in 7,13,25,37 years old stands, and soil samples were taken to analyse physi chemical characteristics in growing season. Research and analysis show that:the pH value of the fallen leaves of larch plantation is 6.0 or so;the acidity of soil doesn't increase,pH value of soil active acid is 6.0 or so; soil cation exchange capacity(CEC) is 20～40 cmol/kg,base saturation percentage(BSP) is above 80%,calcic exchange capacity is 13～27 cmol/kg, humus content mainly consisted of humic acid is above 3%;the larch plantation does not change soil formation process of dark brown soil in which the soil buffer capacity is high, so Ca(OH) 2 should not be applied to decrease the soil acidity.