Atmospheric Sulfur Deposition for a Red Soil Broadleaf Forest in Southern ChinaEnglish Full Text

XU Cheng-Kai, HU Zheng-Yi, CAI Zu-Cong, WANG Ti-Jian, HE Yuan-Qiu and CAO Zhi-Hong State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China). Department of Atmospheric Science, Nanjing University, Nanjing 210093 (China)

Abstract: A two-year study in a typical red soil region of Southern China was conducted to determine 1) the dry deposition velocity （Vd） for SO2 and particulate SO42- above a broadleaf forest, and 2) atmospheric sulfur fluxes so as to estimate the contribution of various fractions in the total. Using a resistance model based on continuous hourly meteorological data, atmospheric dry sulfur deposition in a forest was estimated according to Vd and concentrations of both atmospheric SO2 and particulate SO42-. Meanwhile, wet S deposition was estimated based on rainfall and sulfate concentrations in the rainwater. Results showed that about 99% of the dry sulfur deposition flux in the forest resulted from SO2 dry deposition. In addition, the observed dry S deposition was greater in 2002 than in 2000 because of a higher average concentration of SO2 in 2002 than in 2000 and not because of the average dry deposition velocity which was lower for SO2 in 2002. Also, dry SO2 deposition was the dominant fraction of deposited atmospheric sulfur in forests, contributing over 69% of the total annual sulfur deposition. Thus, dry SO2 deposition should be considered when estimating sulfur balance in forest ecological systems.

Keywords：

atmospheric sulfur deposition; dry deposition velocity; particulate SO42-; red soil; SO2;

Series：
(D) Agriculture
Subject：
Forestry
Classification Code：
S718

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Atmospheric Sulfur Deposition for a Red Soil Broadleaf Forest in Southern ChinaEnglish Full Text

XU Cheng-Kai, HU Zheng-Yi, CAI Zu-Cong, WANG Ti-Jian, HE Yuan-Qiu and CAO Zhi-Hong State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China). Department of Atmospheric Science, Nanjing University, Nanjing 210093 (China)

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