文献类型：期刊文献

英文题名：Rainfall partitioning and associated chemical alteration in three subtropical urban tree species

作者：Jiang, Zhi-Yun[1] Zhi, Qiu-Ying[1] Van Stan, John T.[2,3] Zhang, Si-Yi[4] Xiao, Yi-Hua[5] Chen, Xiao-Ying[1] Yang, Xiao[1] Zhou, Hou-Yun[1] Hu, Zhong-Min[1] Wu, Hua-Wu[6]

第一作者：Jiang, Zhi-Yun

通信作者：Jiang, ZY[1];Wu, HW[1]

机构：[1]South China Normal Univ, Sch Geog, 55 West Zhongshan Ave, Guangzhou 510631, Peoples R China;[2]Georgia Southern Univ, Appl Coastal Res Lab, Savannah, GA USA;[3]Georgia Southern Univ, Dept Geol & Geog, Savannah, GA USA;[4]Guangdong Acad Sci, Inst Ecoenvironm & Soil Sci, Guangzhou 510650, Peoples R China;[5]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China;[6]Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Peoples R China

年份：2021

卷号：603

外文期刊名：JOURNAL OF HYDROLOGY

收录：;EI(收录号：20214511117802);Scopus(收录号：2-s2.0-85118490714);WOS:【SCI-EXPANDED(收录号:WOS:000715326800038)】；

基金：We would like to thank Yuan-Mei Gu, Yi-Hong Zeng, Da Zeng, RuChen Xie, Rui-Bin Huang, Zhi-Cheng Liang, Yan-Zhen Fang, Zhi-Guang Yang, Chao-Ming Liao, Lin Huang, Hui-Ting Hu, Er-Lan Bu, Ying-Yin Zhong, Ke-Ke Xie, Yang-Yang Li, Jie-Xin Deng, Ya-Qian Su, and YuZhe Zhang for the assistance with data collection. We also appreciate the support from the Guangdong Pearl River Delta Forest Ecosystem Research Station. This study was financially supported by National Natural Science Foundation of China (41901027), China Postdoctoral Science Foundation (2021T140222, 2018M643110) and Natural Science Foundation of Guangdong Province, China (2021A1515012208). The authors would like to thank the Editors and anonymous Reviewers for their insightful comments.

语种：英文

外文关键词：Throughfall; Stemflow; Canopy exchange; Dry deposition; Canopy budget model; Urban trees

摘要：Rainwater is altered hydrologically and chemically as it passes through tree canopies to reach the soil surface, but this aspect of urban forest ecosystems has received less attention than that of natural ecosystems. Hydrological partitioning and changes in solute composition of rainfall were examined in an urban forest within Guangzhou city, in southern China, with reference to three typical subtropical urban tree species (Roystonea regia, Ficus microcarpa, and Lagerstroemia speciosa) with large but morphologically distinct canopies. Three components of rainfall, namely throughfall, stemflow, and interception, were measured and sampled from September 2018 to September 2019. A canopy budget model was used for estimating the contribution of canopy exchange and dry deposition to net rainfall (throughfall + stemflow) solute flux. Being a palm, R. regia recorded the highest percentages of throughfall (72.60%) and stemflow (8.68%) whereas interception was higher in F. microcarpa (33.48%) and L. speciosa (30.54%). The concentrations of almost all the solutes (Ca2+, K+, Na+, Mg2+, Cl, NO3- , and SO42-) in throughfall and stemflow were higher than those in rainfall, suggesting that water was enriched with these solutes as a result of passing through the canopy. The model of canopy budget also showed that whereas all the three species were similar in terms of the leaching of macronutrient cations, the species differed in term of anions: whereas R. regia and L. speciosa generally absorbed or retained anions on foliage, twigs, or trunks, F. microcarpa leached Cl and NO3- (presumably because of its unique aerial root). These results can inform the design of urban forests. For example, the lack of NO3- uptake by F. microcarpa suggests that it would be less suitable for mitigating the problems of N deposition which are significant in southern China than the other two species; on other hand, the rainfall partitioning and canopy exchange characteristics of L. speciosa make it more suitable for intercepting rainwater as well as for alleviating the problem of N deposition. The findings of this study therefore have significant implications for the selection of urban tree species in similar subtropical regions worldwide.