Potential acidifying capacity of deposition experiences from regions with high NH4+ and dry deposition in China

The Science of the Total Environment
R David VogtYu Zhao

Abstract

Acid rain may cause soil acidification possibly leading to indirect forest damage. Assessment of acidification potential of atmospheric deposition is problematic where dry and occult deposition is significant. Furthermore, uncertainty is enhanced where a substantial part of the potential acidity is represented by deposition of ammonium (NH(4)(+)) since the degree of assimilation and nitrification is not readily available. Estimates of dry deposition based on deposition velocity are highly uncertain and the models need to be verified or calibrated by field measurements of total deposition. Total deposition may be monitored under the forest canopy. The main problem with this approach is the unknown influence of internal bio-cycling. Moreover, bio-cycling may neutralize much of the acidity by leaching of mainly K(+). When the water percolates down into the rooting zone this K(+) is assimilated again and acidity is regenerated. Most monitoring stations only measure deposition. Lacking measurements of output flux of both NH(4)(+) and NO(3)(-) from the soil one cannot assess current net N transformation rates. Assumptions regarding the fate of ammonium in the soil have strong influence on the estimated acid load. Assuming that all th...Continue Reading

Citations

Oct 1, 2013·Environmental Science and Pollution Research International·Qing WanXing-Hui Li
Jun 24, 2014·Global Change Biology·Xiankai LuJiangming Mo
Aug 17, 2012·Journal of Environmental Sciences (China)·Deli Tong, Renkou Xu
Jan 10, 2012·The Science of the Total Environment·Xiaohua WeiJ P Hamish Kimmins
Jun 17, 2011·Environmental Pollution·Yu ZhaoJiming Hao
Sep 11, 2010·Environmental Pollution·Xuejun LiuFusuo Zhang
May 18, 2016·The Science of the Total Environment·Jun JiangJunhua Yan
Sep 22, 2020·Environmental Science and Pollution Research International·Xiao-Ying PanPeng Guan

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