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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.
By observing the stem-stem flow characteristics of the natural secondary forest in the eastern mountainous area of northeastern China, the dynamic changes of the stem-stem flow of the four main tree species under different rainfall conditions were studied. The results showed that during the rainfall, While the stem flow increased significantly with the increase of rainfall when the rainfall was higher than the critical rainfall, and the greater the diameter, the more obvious the increase.The relationship between stem flow and rainfall can be used as model y = ax2 + bx + c.The tree crown amplitude also significantly influenced the stem flow of the trunk, and there was a positive correlation between the two. The fitting equation was y = ax + b, and the correlation coefficients were above 0.9.