华北暖温带山地落叶阔叶混交林的茎流研究

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，并比较了不同树种是的差异。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元素各次测量的美元浓度及其变异系数，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

A STUDY ON THE STEMFLOW OF THE DECIDUOUS BROAD LEAVED MIXED FOREST IN THE WARM TEMPERATE ZONE OF NORTHERN CHINA

The stemflow and its element content were studied,meanwhile comparisons were made among five main tree species in the deciduous broad leaf mixed forest in this paper. The relationships between gross fainfall and stemflow in the five main tree species and in the whole forest were analyzed in 82 precipitation events in the growth seasons of 1993 and 1994,concentration and amount of seven chemical elements in the gross precipitation and stemflow were also analyzed. The results showed that the concentrations of the seven chemical elements were all the highest in the stemflow of Betula dahurica in the five tree species. The concentrations of N,S and K were remarkbaly increased by 53.4%,337 4% and 124% respectively,P was reduced,and Al was not changed in the stemflow of the whole forest. The order of relative element content in gross rainfall was N>K>Ca>S>Mg>P>Al,and that in stemflow was K>S>N>Ca>Mg>P>Al in the whole forest.