期刊
ENVIRONMENTAL POLLUTION
卷 157, 期 2, 页码 404-409出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2008.09.038
关键词
Leaf litterfall; Forest soil; Atmospheric deposition; Translocation
资金
- Villum Kann Rasmussens Foundation, Denmark
- Jorgen Kystol
- Geological Survey of Denmark and Greenland
- Kare Kemp National Environmental Research Institute
- Aarhus University
- Denmark and Karna Heinsen, Biological Institute
- University of Copenhagen
The root uptake of lead (Pb) by trees and the transfer of Pb by leaf litter deposition to the forest floor were investigated through a pot experiment with Norway spruce. Natural Pb and radio isotopic lead (Pb-210) were determined in needles and twigs and in the pot soil spiked with Pb-210. Calculations of the specific activity in plant material and in the supporting pot soil showed that less than 2% of the Pb content of needles and twigs originates from root uptake and approximately 98% are deposited from the atmosphere. Atmospheric Pb has declined by a factor of 7 from 1980 to 2007 but is still a major pathway of Pb to vegetation and topsoils. The conclusion from the experiment is that the internal circulation of Pb through root uptake, translocation and litterfall, gives an insignificant input of Pb to the forest floor compared to atmospheric deposition. (C) 2008 Elsevier Ltd. All rights reserved.
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