文献类型：期刊文献

中文题名：广州市3种典型绿化树冠层降水再分配对重金属元素沉降的影响

英文题名：The effects of rainfall partitioning on heavy metal deposition for three typical urban tree species in Guangzhou

作者：陈晓滢[1] 植秋滢[1] 杨肖[1] 蒋志云[1] 谢如琛[1] 古苑湄[1] 曾艺虹[1] 曾达[1] 孙升升[1] 黄锐斌[1] 肖以华[2]

第一作者：陈晓滢

机构：[1]华南师范大学地理科学学院,广州510631;[2]中国林业科学研究院热带林业研究所,广州510520

年份：2021

卷号：40

期号：7

起止页码：1937-1946

中文期刊名：生态学杂志

外文期刊名：Chinese Journal of Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：广东省自然科学基金博士启动项目(2018A030310517);国家自然科学基金项目(41901027);中国博士后科学基金项目(2018M643110)资助。

语种：中文

中文关键词：穿透水;树干茎流;冠层淋溶;重金属沉降;城市绿化树

外文关键词：throughfall;stemflow;canopy leaching;heavy metal deposition;urban tree species

分类号：X173

摘要：植物冠层降水再分配对化学物质迁移过程具有重要影响。以广州市3种典型绿化树王棕(Roystonea regia)、榕树(Ficus microcarpa)和大花紫薇(Lagerstroemia speciosa)为研究对象,通过实验观测、样品收集和分析测试,研究2018年10月—2019年9月3种绿化树冠层降水再分配过程及其对重金属元素(Zn、Fe、Cu、Ni、Pb、As、Cd、Hg)沉降的影响。结果表明:王棕、榕树和大花紫薇的穿透水分别占降水量比例62.68%、58.79%和67.95%;树干茎流率分别为6.34%、2.08%和1.02%,说明3种树木降水再分配组分存在一定差异。在对重金属元素沉降影响方面,除榕树树干茎流Cd淋溶系数小于1外,3种绿化树的穿透水和树干茎流重金属元素淋溶系数均大于1,表现出正淋溶,且王棕、榕树和大花紫薇的重金属输入总量分别是大气降水的1.11、1.80和1.99倍,说明降水淋洗了植物冠层干沉降重金属物质,使得重金属含量增加。3种绿化树树干茎流重金属富集率变化范围为2.06~118.22,说明绿化树树干茎流重金属元素具有明显的富集效应,研究结果对于城市绿化树树种遴选和区域污染防治具有重要科学意义。
Rainfall partitioning has great effects on chemical elements transport.We examined the effects of rainfall partitioning on the deposition of heavy metals(Zn,Fe,Cu,Ni,Pb,As,Cd and Hg)for three typical urban tree species(Roystonea regia,Ficus microcarpa and Lagerstroemia speciosa)in Guangzhou from October 2018 to September 2019.Results showed that the rate of throughfall to precipitation for R.regia,F.microcarpa and L.speciosa was 62.68%,58.79%and 67.95%,respectively,while the stemflow rate was 6.34%,2.08%and 1.02%,respectively.These results suggest different rainfall partitioning among three urban tree species.Except that Cd leaching coefficient of F.microcarpa stemflow was less than 1,the leaching coefficients of heavy metals for throughfall and stemflow of three species were greater than 1,indicating positive leaching.The total inputs of heavy metals for three urban trees were 1.11,1.80 and 1.99 times of that from precipitation,indicating that the contents of heavy metals were increased after precipitation.The enrichment rate of heavy metals for stemflow ranged from 2.06 to 118.22,suggesting that stemflow could enrich heavy metals in urban trees.The results have important implications for the selection of urban tree species and the prevention of regional pollution.