Deposition pattern of precipitation and throughfall in a subtropical evergreen forest in south-central China |
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Authors: | Gong Zhang Guang-Ming Zeng Guo-He Huang Yi-Min Jiang Jia-Mei Yao Chun-Yan Du Ru Jiang Chang Zhang |
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Affiliation: | (1) College of Environmental Sciences and Engineering, Hunan University, Hunan Province, Changsha, 410082, China;(2) Faculty of Engineering, University of Regina, Regina, Canada;(3) Hunan Environmental Protection Bureau, Hunan Province, Changsha, China;(4) Xiangya Hospital, Central South University, Hunan Province, Changsha, China |
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Abstract: | The effects of dry deposition, canopy leaching, precipitation ion concentration, and precipitation H+ concentration on net throughfall flux (NTF, throughfall minus bulk precipitation) were evaluated on a seasonal basis by using a multiple regression analysis approach based on an observation period of 4 years in Shaoshan subtropical mixed evergreen forest, south-central China. Regression analysis results indicated that the estimated canopy exchange flux was the dominant factor regulating the NTF and the calculated dry deposition was a minor term. The seasonal dry deposition of base cations accounted for 15%–43% of the NTF. The NTF analysis showed that K+, Ca2+, Mg2+, Na+, and weak acids in throughfall were derived from foliar leaching and the canopy uptakes of H+, NH4 +, and NO3 − were from precipitation. The retention rate of proton (H+ and NH4 +) in the canopy was close to the canopy leaching rate of base cations when corrected for weak acids because weak acid-induced canopy leaching did not exchange with protons, which suggested that the canopy leaching processes neutralized acid precipitation in Shaoshan forest. |
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Keywords: | Base cations Canopy exchange Dry deposition Precipitation quantity Subtropical evergreen forest |
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