冀北山地油松蒙古栎混交林水化学特征

对冀北山地油松蒙古栎混交林穿透雨、树干茎流和枯透水中的Ca、Fe、K、Mg、Mn、Zn共6种养分元素进行测定。结果表明:(1)大气降水经过林冠层后化学元素含量均有不同程度增加,化学元素含量排序为Ca>K>Mg>Fe>Mn>Zn,树干茎流各项指标均增长较多,化学元素含量排序为Ca>K>Mg>Fe>Zn>Mn,枯落物水中K和Ca元素浓度增加最大。(2)大气降雨中Zn的变异系数最大,达2.853;K和Ca元素的变异系数最小,分别为0.158,0.163。穿透雨中变异系数最大的为Fe元素,其值为0.692;树干茎流中变异系数最大的为Zn元素,其值为0.594;枯透水中变异系数最大的为Fe元素,其值为1.164。(3)经过淋洗后水样中各元素的浓度均有所增加,穿透水、树干茎流和枯透水中Ca、K增加较多,Fe、Mn、Zn的淋溶量较少。

Precipitation Hydro-chemical Characteristic of the Mixed Forest of Pinus and Mongolicain of North Mountain of Hebei Province

The contents of six nutrient elements(Ca,Fe,K,Mg,Mn,Zn) in through-fall,stem-flow and litter water were measured in the Pinus-Mongolicain cross-forest in mountains of north Hebei province.The results showed that:(1)Chemical elements content of atmospheric precipitation were increased to different degrees as a sequence of Ca>K>Mg>Fe>Mn>Zn after they were passed through the canopy layer,also a sequence of Ca>K>Mg>Fe>Zn>Mn was detected in stem-flow,in litter water,the elements of K and Ca had largest increase in concentration.(2)In atmospheric precipitation,variation coefficient of Zn was the highest one with its index 2.853,K and Ca were the lowest with their index 0.158 and 0.163 respectively.In through-fall,the element Fe had the highest variation coefficient as well as the element Zn in stem-flow with their index 0.692,0.594 respectively.In litter water the element had the highest variation coefficient was also Fe with its index 1.164.(3)All of the elements measured were increased in concentration after leaching,and there were more Ca,K but few Fe,Mn,Zn leached in through-fall,stem-flow and litter water.