<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Jung, Kangho</style></author><author><style face="normal" font="default" size="100%">Chang, Scott X.</style></author><author><style face="normal" font="default" size="100%">Ok, Yong Sik</style></author><author><style face="normal" font="default" size="100%">Arshad, M. Charlie</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Critical loads and H+ budgets of forest soils affected by air pollution from oil sands mining in Alberta, Canada</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">acidity</style></keyword><keyword><style  face="normal" font="default" size="100%">air emissions</style></keyword><keyword><style  face="normal" font="default" size="100%">alkalinity</style></keyword><keyword><style  face="normal" font="default" size="100%">forest</style></keyword><keyword><style  face="normal" font="default" size="100%">forest characteristics</style></keyword><keyword><style  face="normal" font="default" size="100%">pH</style></keyword><keyword><style  face="normal" font="default" size="100%">soil properties</style></keyword><keyword><style  face="normal" font="default" size="100%">sulphur and SO2</style></keyword><keyword><style  face="normal" font="default" size="100%">UofA</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2013</style></year><pub-dates><date><style  face="normal" font="default" size="100%">04/2013</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.researchgate.net/profile/Scott_Chang4/publication/257522367</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">Atmospheric Environment </style></publisher><volume><style face="normal" font="default" size="100%">69</style></volume><pages><style face="normal" font="default" size="100%">8 pages </style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">We investigated the critical load (CL) and exceedance (EX) of sulfur (S) deposition, temporal changes in soil chemistry, and H+ budget of soils in plots dominated by Pinus banksiana (jack pine) or Populus tremuloides (trembling aspen, aspen) in two acid-sensitive watersheds to assess the risk of soil acidification by S emissions from oil sands mining in the Athabasca oil sands region (AOSR), Canada. The CLs and EXs were determined by two methods: one was based on bulk deposition and the other based on total deposition (as a sum of bulk deposition and interception deposition). The CLs ranged from 223 to 711 molc ha−1 yr−1 based on bulk deposition. Those values were similar to that obtained based on total deposition. However, EXs based on bulk deposition were significantly lower (p   &lt; 0.001) than those based on total deposition due to the relative increase of SO42−
 concentrations in interception deposition, indicating that EXs based on bulk deposition only could underestimate the risk of soil acidification in the AOSR. The S deposition did not exceed CLs in the long-term for both methods. The pH in the forest floor increased and available SO42−
 (as the sum of soluble and adsorbed SO42−
) in the forest floor and surface mineral soils increased in both jack pine and aspen stands between 2005 and 2010. The H+ budget ranged from −289 to −130 molc ha−1 yr−1 in jack pine stands and from −510 to −371 molc ha−1 yr−1 in aspen stands. Our results suggest that 1) soils in the studied forest stands have recovered from acidification based on the increasing soil pH over time and the negative H+ budget, and 2) the risk of soil acidification should be assessed by CL and EX calculated based on total deposition.</style></abstract><custom2><style face="normal" font="default" size="100%">Athabasca Oil Sands Region (AOSR)</style></custom2><custom3><style face="normal" font="default" size="100%">http://www.worldcat.org/oclc/5900098539</style></custom3><custom4><style face="normal" font="default" size="100%">OSEMB</style></custom4></record></records></xml>