文献类型：期刊文献

英文题名：Canopy Exchange Process of Heavy Metals in Subtropical Urban Forest in Southern China

作者：Zhang, Han-Wen[1] Jiang, Zhi-Yun[1,2] Xiao, Yi-Hua[3] Huang, Lin[4] Li, Shui-Xia[1] Fu, Zhi-Gao[3] Zhang, Si-Yi[5] Ma, Yu-Jun[6]

第一作者：Zhang, Han-Wen

通信作者：Jiang, ZY[1];Jiang, ZY[2]

机构：[1]South China Normal Univ, Sch Geog, 55, West Zhongshan Ave, Tianhe Dist, Guangzhou 510631, Peoples R China;[2]China Univ Geosci, State Environm Protect, Key Lab Source Apportionment & Control Aquat Pollu, Wuhan 430078, Peoples R China;[3]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China;[4]East China Normal Univ, Sch Geog Sci, Shanghai 200241, Peoples R China;[5]Guangdong Acad Sci, Natl Reg Joint Engn Res Ctr Soil Pollut Control &, Guangdong Key Lab Integrated Agroenvironm Pollut C, Inst Ecoenvironm & Soil Sci, Guangzhou 510650, Peoples R China;[6]Sun Yat Sen Univ, Sch Geog & Planning, Guangzhou 510275, Peoples R China

年份：2025

卷号：12

期号：3

外文期刊名：ENVIRONMENTAL PROCESSES-AN INTERNATIONAL JOURNAL

收录：EI(收录号：20253619117081);Scopus(收录号：2-s2.0-105015090040);WOS:【ESCI(收录号:WOS:001562567700001)】；

基金：We would like to thank Yuan-Shun Liang and Yue-Feng Liu for the assistance with data collection and Meng-Di Wu for the modification of manuscript. We also appreciate the support from the Guangdong Pearl River Delta Forest Ecosystem Research Station.

语种：英文

外文关键词：Throughfall; Canopy interception; Stemflow; Canopy budget model; Heavy metal

摘要：Rainwater undergoes hydrological and chemical transformations as it passes through the forest canopy. However, this process in urban forests has received less attention compared to natural ecosystems, leading to an underestimation of their purification. This study investigated precipitation and nutrient redistribution in an urban forest in Guangzhou, southern China, a characteristic subtropical region. Heavy metal concentrations in rainfall, throughfall, and stemflow were meticulously measured in 147 precipitation events and sampled from January 2020 to September 2021. A canopy budget model was employed to estimate the contribution of canopy exchange and dry deposition to the net rainfall (throughfall + stemflow) nutrient flux. The annual input of heavy metals in precipitation was 293.82 g ha(-)(1) y(-)(1), which increased to 496.08 g ha(-)(1) y(-)(1) after canopy redistribution. Of this increase, 117.73 g ha(-)(1) y(-)(1) originated from dry deposition and 84.54 g ha(-)(1) y(-)(1) from the canopy exchange process. Except for Manganese (Mn), which was absorbed by the canopy, all other elements Chromium (Cr), Copper (Cu), Arsenic (As), Caesium (Cs), Plumbum (Pb) leached from the canopy. Giving that impervious surfaces are persistent sources of metal resuspension, and depositions are efficiently recycled into respirable particles, these findings suggest that forest canopies can purify heavy metals from atmospheric deposition at a 1:2.5 area efficiency ratio relative to urban surfaces. These results not only enhance our understanding of heavy metal circulation within the canopy but also offer further insights for mitigating urban heavy metal pollution.