Deposition pattern of precipitation and throughfall in a subtropical evergreen forest in south-central China
Authors: Zhang, Gong; Zeng, Guang-Ming; Huang, Guo-He; Jiang, Yi-Min; Yao, Jia-Mei; Du, Chun-Yan; Jiang, Ru; Zhang, Chang
Source: Journal of Forest Research, Volume 11, Number 6, December 2006 , pp. 389-396(8)
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.
Document Type: Research Article
Affiliations: Email: firstname.lastname@example.org
Publication date: 2006-12-01