Changes in pH, CEC and Exchangeable Acidity of Some Forest Soils in Southern China During the Last 32–35 Years
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- Dai, Z., Liu, Y., Wang, X. et al. Water, Air, & Soil Pollution (1998) 108: 377. doi:10.1023/A:1005015526022
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Soil acidification has been occurred in two locations in southern China. The changes in soil pH during a 35 yr period has been about 1.0 pH 2O) units, and about 0.58–0.71 pH (KCl) units at Wuming in Guangxi Zhuang Autonomous Region and Zhurongfeng of Mt. Heng in Hunan Province. A decrease in CEC and BS and an increase in hydrogen and aluminum ion concentrations were found in the acidified soils, and related to the acidification caused by acid deposition. Hydrogen ion concentration increased about 0.1–1.0 × 10-6 equivalent g-1 soil yr-1. Cation exchangeable capacity (CEC) and base saturation (BS) decreased to 53–76 and 30–59% in the acidified soils respectively, and an increase in exchangeable acidity also occurred. Acidification in the topsoil is higher than in the subsoil.