Water chemistry in forested acid sensitive sites in sub-tropical Asia receiving acid rain and alkaline dust

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• 作者：Rolf D. Vogt ; Jingheng Guo ; Jiahai Luo ; Xiaoyu Peng ; Renjun Xiang ; Jinsong Xiao ; Xiaoshan Zhang ; Dawei Zhao ; Yu Zhao
• 刊名：Applied Geochemistry
• 出版年：2007
• 期刊代码：5_08832927
• 类别：ce
• 出版时间：June 2007
• 卷：22
• 期：6
• 页码：1140-1148
• 文件大小：238 K

摘要

Acid rain, due to wet and dry deposition of S and N compounds, is an increasing environmental problem in China. A considerable deposition of alkaline dust serves to mitigate the acidifying effect to varying extent. Data from 3 years, a monitoring of water chemistry in 10 water compartments (i.e., two qualities of deposition, two types of throughfall, solution in five genetic soil horizons, and runoff) at five well documented sub-tropical forested catchments, have been interpreted in order to identify key processes governing the water chemistry in catchments suffering acid rain. This study of water chemistry in regions with sub-tropical climate supplements similar monitoring studies conducted in temperate regions with different types of soils and compositions of deposition. Natural organic acids as well as nutrient cycling of K⁺ have strong influence on the water chemistry in throughfall and upper soil horizons at the relatively pristine sites. At sites receiving elevated S and N deposition an accelerated cycling of K⁺ removes much of the mineral acidity in throughfall. The soil uptake of this K⁺ results in release of H⁺. Nitrification and/or assimilation of a substantial deposition of reduced N contributes at some sites also significantly to the acidity in the soils. During the study period, Ca²⁺ in solution was exchanged for Al³⁺ in the soils with an effective base saturation less than 20%. In deeper soil horizons most of this mobilized Al is re-adsorbed along with .