天然次生林群落不同树种树干茎流研究

On Stem Flow for Different Tree Species in Natural Secondary Forest

通过对东北东部山区天然次生林树干茎流特征的观测,研究了在不同降雨条件下群落内4种主要树种树干茎流的变化动态.结果发现:在降雨过程中,树干茎流量随径级的增加而增加.当降雨量高于临界降雨量时,树干茎流量随降雨量的增大而显著增加,并且径级越大,增加的幅度越明显.树干茎流量与降雨量的关系可用模型y=ax2+bx+c进行拟合.树木冠幅也显著地影响着树干茎流,二者存在正相关关系,拟合方程为y=ax+b,相关系数均在0.9以上.

Taking different tree species in natural secondary forest in the eastern part of Northeast China as test objects, a field investigation was conducted on the variation characteristics of four kinds of tree species stem flow, and analyzed the effects of rainfall and crown area. The result showed that the stem flow increased with the increase of diameter class. The stem flow increased markedly with the increase of rainfall when rainfall was higher than critical rainfall, and the increased extent of stem flow was visible with the increase of diameter class. There was a consanguineous connection with the stem flow of different tree species and diameter class and rainfall. The fitting equation was y = ax^2 ＋ bx ＋ c. The crown area influenced markedly the stem flow, and there was a positive correlation connection between stem flow and crown area. The fitting equation was y = ax ＋ b, and the correlation coefficients were all 0.9 and more.