原始红松林穿透雨和树干茎流养分特征研究

对小兴安岭原始红松林穿透雨和树干茎流中的K,Ca,Mg,Mn,Fe共5种养分元素进行了测定,结合水量分配比例,计算了各元素在森林中的净输入量。结果表明:⑴原始红松林穿透雨和树干茎流中,除Fe元素外,所有浓度值均有树干茎流>穿透雨>大气降雨;从各元素平均浓度来看,Ca元素最高,Fe元素最低,其排序为:Ca>K>Mg>Mn>Fe。⑵大气降雨年平均浓度中,K元素变动系数最大,为1.514,Ca元素最小,为0.827;原始红松林穿透雨、树干茎流年平均浓度中变动系数最大的元素分别为Mn,Mg(或Fe);变动系数最小的元素分别为Ca,Mn;各元素年平均浓度的变异系数均为大气降雨>穿透雨>树干茎流。⑶原始红松林各元素净输入量排序为:K>Ca>Mg>Mn>Fe,且Fe元素的净输入量为负值。

Nutrient Characteristics of Through-all and Stem-flow in Virgin Forest of Pinus koraiensis

The contents of five nutrient elements(K,Ca,Mg,Mn,Fe) in through-fall,stem-flow were measured in the Pinus koraiensis virgin forest of Xiaoxing'an Mountains,and according to the allotment of water amount,net input-quantity of each element in the forest was calculated,the results showed that:(1)The contents of nutrient elements in precipitation,through-fall,and stem-flow were all had the decreased order of stem-flow>through-fall>precipitation except of Fe.The average contents of different nutrient elements were in the decreased tendency of Ca>K>Mg>Mn>Fe.(2)The biggest coefficient of variation(Cv) in precipitation was 1.514 for K element and the least one was 0.827 for Ca element.The biggest Cv of nutrient elements in through-fall,stem-flow of the Pinus koraiensis virgin forest were Mn,Mg,and Fe,and the least were Ca,Mn.The average contents of the five nutrient elements' Cv in precipitation,through-fall,and stem-flow had the decreased tendency of precipitation > through-fall > stem-flow.(3)The net input-quantity of nutrient elements in the Pinus koraiensis virgin forest was as follows:K>Ca>Mg>Mn>Fe,furthermore,the net input-quantity of Fe in Pinus koraiensis virgin forest was negative.