Journal
ENVIRONMENTAL POLLUTION
Volume 202, Issue -, Pages 187-195Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2015.03.021
Keywords
Soil mercury pool; Stream water; Soil solution; Soil/air exchange flux
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Funding
- National Basic Research Program of China [2013CB430002]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB14020205]
- Natural Science Foundation of China [41373124, 41371461]
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Tieshanping catchment in southwest China was supposed to a large pool of atmospheric mercury. This work was aimed to examine THg (total mercury) concentrations, pools and influence factors in the acidic forest. THg concentrations were highly elevated in the study area, which was significantly depended on TOM (total organic matter) concentrations and altitudinal elevation, whereas negatively correlated with soil pH. The pools of mercury accumulated in soils were correlated strongly with the stocks of TOM and altitude, ranged from 5.9 to 32 mg m(-2) and averaged 14.5 mg m(-2), indicating that the acidic forest was a great sink of atmospheric mercury in southwest China. THg concentrations in stream waters decreased with altitude increasing and regression analyses showed that soil/air exchange flux would be increased with the decrease of altitude. Present results suggest that elevation increasing decreases THg losses as low THg concentrations in runoffs and volatilization from soils. (C) 2015 Elsevier Ltd. All rights reserved.
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