摘要
为了研究栾树人工林林内外的降水重金属含量变化,以湘潭锰矿栾树人工林为研究对象,对其大气降水、穿透水、树干茎流和土壤渗透水中的重金属元素Fe、Mn、Cu、Zn、Cd、Pb含量以及pH值进行测定。结果表明:林外降水的pH值平均为6.57,转化为穿透水和树干茎流后的pH值分别为6.55和6.09,转化为土壤渗透水(0～30 cm)后回升为6.74;大气降水经过栾树林冠后,大多数重金属元素含量增加,林外雨中各重金属元素平均含量按大小排序为Mn>Cu>Zn>Pb>Fe,穿透水为Mn>Zn>Cu>Fe>Pb,树干茎流为Mn>Fe>Zn>Cu>Pb,穿透水、树干茎流中的Mn元素含量增幅最大;穿透水中Pb元素为负淋溶,说明栾树林冠能吸收Pb元素;随着土壤层次的加深,渗透水中Mn元素的含量逐渐减少;随着降水量的增加,林外降水、穿透水、树干茎流中的重金属元素含量均明显减小。
In order to study the concentrations of heavy metals in Koelreuteria paniculata plantation,The concentrations of heavy metals（Fe,Mn,Cu,Zn,Cd,Pb） and pH value in precipitation,throughfall,Stemflow and leakage water in the Koelreuteria paniculata plantation in Xiangtan Manganese Mine were measured.The results showed that： The average pH value of precipitation outside the forest was 6.57,while it reduced to 6.55 and 6.09 in throughfall and stemflow,and then recovered to 6.74 in the leakage water（0~30 cm）;Most heavy metal contents were increased after the rainfall through the Koelreuteria paniculata canopy,the mean concentrations of heavy metals were arranged as MnCuZnPbFe for rainfall,MnZnCuFePb for throughfall,MnFeZnCuPb for stemflow,The contents of Mn in throughfall and stemflow had a highest increase;The contents of Pb showed negative leaching in throughfall,which explain that the Koelreuteria paniculata canopy can absorb the element of Pb;The contents of Mn reduced in the leakage water with the deepening of the soil layer;The concentrations of heavy metals in rainfall,throughfall,stemflow reduced significantly with the increase of rainfall.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2013年第6期88-93,共6页
Journal of Central South University of Forestry & Technology
基金
国家环保公益性项目"长株潭重金属矿区污染控制与生态修复技术研究"(200909066)
关键词
栾树人工林
重金属含量
穿透水
树干茎流
Koelreuteria paniculata plantation
heavy metal contents
throughfall
stemflow
