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测定华北暖温带山地落叶阔叶混交林的树干茎流量及其元素含量，并比较了不同树种间的差异。通过８２次孤立降雨的测量，得到了辽东栋、棘皮桦、五角枫、大叶白腊和蒙椴５种主要树种及整个林分茎流量Ｓ与降雨Ｐ的关系，经多种方程拟合，仍以直线方程为最佳。降雨水质分析的结果给出了Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ、Ａｌ、Ｓ元素各次测量的平均浓度及其变异系数，以及年输入量的估测值。茎流元素含量的分析结果表明，５种乔木中，以棘皮桦的茎流中各元素浓度的增加幅度最大，表现出最强的淋溶效应。辽东栎、大叶白蜡、蒙椴形成的茎流中Ｐ的浓度均有下降。Ａｌ元素在各树种茎流中与降雨相比其浓度均无显著变化。就整个林分而言，茎流中以Ｎ、Ｓ和Ｋ浓度的增加较为显著，分别增加了５３．４％、３３７．４％和１２４％，Ｐ的浓度表现为负增量。
The flow and elemental contents of stems in the deciduous and broad-leaved mixed forest in the temperate zone of North China were measured, and the differences among different tree species were compared. Through the measurement of 82 isolated rains, the relationships between the stem flow S and rainfall P of five main species of Liaodong dong, Echinoderms, Pentagon, Pelargonium sibirica and Tilia mandshurica were obtained. After fitting many kinds of equations, Still the best linear equation. The result of rainfall quality analysis gives the average concentrations of each of the N, P, K, Ca, Mg, Al, S elements and their coefficients of variation, as well as the annual input estimates. The results of stemflow elemental analysis showed that among the five tree species, the concentration of each element in the stem stream of Betula armandii increased the most, showing the strongest leaching effect. The concentration of P in the stem flow formed by Quercus liaotungensis, Larix kaempferi and Tilia amurensis decreased. There was no significant change in the concentration of Al in the stem flow of all species compared with rainfall. For the whole stand, the concentrations of N, S and K in the stem flow increased significantly by 53.4%, 337.4% and 124% respectively, and the P concentration showed a negative increment.