文献类型：期刊文献

中文题名：栓皮栎树皮对铅的吸收-迁移-贮存规律

英文题名：Absorption,Migration and Storage of Pb by the Bark of Quercus variabilis

作者：刘彦平[1] 贾子瑞[1] 常二梅[1] 刘建锋[1] 史胜青[1] 江泽平[1] 赵秀莲[1]

第一作者：刘彦平

机构：[1]林木遗传育种国家重点实验室(中国林业科学研究院林业研究所),北京100091

年份：2023

卷号：51

期号：1

起止页码：32-36

中文期刊名：东北林业大学学报

外文期刊名：Journal of Northeast Forestry University

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD_E2023_2024】；

基金：中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2017SY003);国家自然科学基金项目(42071065)。

语种：中文

中文关键词：栓皮栎;树干;树皮;铅;吸收;迁移;贮存

外文关键词：Quercus variabilis;Trunk;Bark;Lead;Absorption;Migration;Storage

分类号：S718.4

摘要：2021年4月7日至2021年9月20日,在北京市海淀区大昭山设置试验地,以栓皮栎(Quercus variabilis)为研究对象,选择树龄大于10 a、无病虫害、生长良好的6株树木(3株为对照)进行试验。4月7日将60 mL浓度为0.1 mol/L的Pb(NO_(3))2溶液包施于树干胸径处(1.2 m)树皮上,并分别于5、6、7、8月份对每棵处理树的处理部位补充40 mL浓度为0.1 mol/L的Pb(NO_(3))_(2)溶液。处理163 d后,在每棵树周围采集表层土壤(0~5 cm深),用于测定土壤被铅(Pb)污染程度;在树高(H)0.2 m、1.2 m、(1/2)H、(3/4)H处,分别采集树干同一高度的外皮、内皮、边材、心材及顶端叶片样品,使用HNO_(3)微波消煮,应用电感耦合等离子体质谱仪(ICP-OES)测定样品中铅质量分数;分析树皮对铅的吸收-迁移-贮存及树干铅的径向、纵向分布特征和迁移规律。结果表明:树干同一高度的外皮、内皮、边材、心材及顶端叶片中铅质量分数,处理树的高于对照树的;在树高1.2 m处,处理树外皮、内皮铅质量分数,均显著高于对照树的(P<0.05)。在树高0.2、1.2 m处,处理树的铅质量分数,由大到小依次为外皮、内皮、边材、心材;对照树,外皮铅质量分数相对较高,内皮、边材、心材3个部位铅质量分数比较接近。在树高(1/2)H、(3/4)H处,处理树和对照树的内皮、边材、心材之间,铅质量分数均无显著差异。树干重金属铅质量分数,随着距离外表树皮距离的增加呈对数关系下降(决定系数R^(2)=0.999)。依据试验结果,铅可以被栓皮栎树皮吸收和滞留,少量铅被径向迁移至内皮,再经过形成层迁移至边材、心材,纵向迁移至顶端叶片。
From April 7,2021 to September 20,2021,a study was set up on the bark of Quercus variabilis in Dazhao Mountain,Haidian District,Beijing.Six trees(three as the control)with a tree age of more than 10 a with no pests and diseases,and good growth were selected.On April 7,60 mL Pb(NO_(3))_(2) solution with a concentration of 0.1 mol/L was applied on the bark at 1.2 m.In May,June,July and August,40 mL Pb(NO_(3))_(2) solution with a concentration of 0.1 mol/L was applied again on each treatment tree.After 163-d treatment,the topsoil(0-5 cm depth)was collected around each tree to determine the degree of lead(Pb)contamination of the soil.At the tree height(H)of 0.2 m,1.2 m,(1/2)H,(3/4)H,samples of bark,endothelium,sapwood,heartwood and top leaves at the same height of the tree trunk were collected respectively.HNO_(3) microwave digestion was used,and the lead content in the samples was determined by inductively coupled plasma mass spectrometry(ICP-OES).The absorption,migration and storage of lead in bark and the radial and vertical distribution and migration in trunk were analyzed.The contents of lead in bark,endothelium,sapwood,heartwood and top leaves at the same height of the trunk were higher in the treated trees than in the control trees.At the height of 1.2 m,the lead content in bark and endothelium of treated trees was significantly higher than that of control trees(P<0.05).At the height of 0.2 and 1.2 m,the lead content of treated trees was in the order of bark,endothelium,sapwood and heartwood.In the control tree,the lead content in the bark was relatively high,and the lead contents in the endothelium,sapwood and heartwood were similar.At(1/2)H and(3/4)H of tree height,there was no significant difference in lead content between the endodermis,sapwood and heartwood of the treated tree and the control tree.The content of lead in the trunk decreased logarithmically with the increase of the distance from the outer bark with coefficient of determination R^(2) of 0.999.Therefore,lead can be absorbed and retained by the bark of Quercus variabilis,and a small amount of lead can be transferred to the endothelium radially,then to sapwood and heartwood through the cambium,and then to the top leaves longitudinally.