Journal
ENVIRONMENTAL POLLUTION
Volume 159, Issue 5, Pages 1327-1333Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2011.01.012
Keywords
Soil acidification; Acid deposition; Canopy budget model; Through fall; Canopy leaching
Categories
Funding
- Alberta Environment
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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Soil acidification has been of concern in the oil sands region in Alberta due to increased acid deposition. Using the canopy budget model, and accounting for H+ canopy leaching by organic acids, we determined sources and sinks of H+ in throughfall in jack pine (Pinus banksiana) and trembling aspen (Populus tremuloides) stands in two watersheds from 2006 to 2009. In pine stands, H+ deposition was greater in throughfall than in bulk precipitation while the opposite was true in aspen stands. The annual H+ interception deposition was 148.8-193.8 and 49.7-70.0 mol(c) ha(-1) in pine and aspen stands, respectively; while the annual H+ canopy leaching was 127.1-128.7 and 0.0-6.0 mol(c) ha(-1), respectively. The greater H+ supply in pine stands was caused by greater interception deposition of SO42- and organic acids released from the pine canopy. Such findings have significant implications for establishing critical loads for various ecosystems in the oil sands region. (C) 2011 Elsevier Ltd. All rights reserved.
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