Tree-ring recorded variations of 10 heavy metal elements over the past 168 years in southeastern China

Author:

Chen Shiyin1,Yao Qichao2,Chen Xiuling1,Liu Juan3,Chen Deliang4,Ou Tinghai4,Liu Jane15,Dong Zhipeng1,Zheng Zhuangpeng1,Fang Keyan1

Affiliation:

1. Key Laboratory of Humid Subtropical Eco-geographical Process (Ministry of Education), College of Geographical Sciences, Fujian Normal University, Fuzhou, China

2. National Forestry and Grassland Administration (National Park Administration), Beijing, China

3. College of Environmental Science and Engineering, Guangzhou University, Guangzhou, China

4. Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden

5. Department of Geography and Planning, University of Toronto, Toronto, ON, Canada

Abstract

Heavy metal pollution is a serious concern in the urban area of China. Understanding metal pollution history is crucial for setting up appropriate measures for pollution control. Herein, we report a record of concentrations of 10 heavy metals (Fe, Mn, Cu, Zn, Ni, Cr, Cd, Pb, Co, and Sr) in Pinus massoniana tree rings from Fuzhou City over the past 168 years, which represents the longest tree-ring chronology of heavy metals in China. The studied metals displayed contrasting distribution patterns. Among them, Mn and Sr showed the strongest migration trend with peak concentrations at the pith. Co, Cd, and Pb also showed distinctively high concentrations near the boundary between heartwood and sapwood. Ni, Cu, Cr, and Fe showed an increasing trend possibly due to migration toward bark caused by physiological activities and increasing tourism activities and traffic pollution. The other elements (Cr, Fe, and Zn) with low migration revealed the historical pollution possibly discharged by the Fuzhou Shipping Bureau and other anthropogenic activities. Strong correlations between Cu content and temperature were found, which provides an alternative tree-ring proxy for climate reconstruction. This study provides a long-term perspective of the joint impacts of physiological, environmental, and climatological factors on the concentrations of heavy metals in southeastern China.

Publisher

University of California Press

Subject

Atmospheric Science,Geology,Geotechnical Engineering and Engineering Geology,Ecology,Environmental Engineering,Oceanography

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