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Pedosphere
Year: 2010  |  Volume: 20  |  Issue: 3  |  Page No.: 399 - 408

Soil Acidification In Response To Acid Deposition In Three Subtropical Forests Of Subtropical China

Liu Ke-Hui, Fang Yun-Ting, Yu Fang-Ming, Liu Qiang, Li Fu-Rong and Peng Shao-Lin    

Abstract: Long-term changes in soil pH, the current status of soil acidification, and the response of bulk soil and soil water pH to experimental nitrogen addition under three subtropical forests were investigated in Dinghushan Biosphere Reserve of subtropical China. The results showed that the mineral soil pH at 0-20 cm depth declined significantly from 4.60-4.75 in 1980s to 3.84-4.02 in 2005. Nitrogen addition resulted in the decrease of pH in both bulk soil and soil water collected at 20-cm depth. The rapid decline of soil pH was attributed to long-term high atmospheric acid deposition (nitrogen and sulphur) therein. The forest at earlier succession stage with originally higher soil pH appeared to be more vulnerable to acid deposition than that at later succession stage with originally low soil pH.

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