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Effects of precipitation on soil acid phosphatase activity in three successional forests in southern China

Wenjuan Huang,Juxiu Liu,Guoyi Zhou,Dainan Zhang,Q. Deng

Published 2011 in Biogeosciences

ABSTRACT

Phosphorus (P) is often a limiting nutrient for plant growth in tropical and subtropical forests. Global cli- mate change has led to alterations in precipitation in the re- cent years, which inevitably influences P cycling. Soil acid phosphatase plays a vital role in controlling P mineraliza- tion, and its activity reflects the capacity of organic P min- eralization potential in soils. In order to study the effects of precipitation on soil acid phosphatase activity, an experi- ment with precipitation treatments (no precipitation, natural precipitation and doubled precipitation) in three successional forests in southern China was carried out. The three forests include Masson pine forest (MPF), coniferous and broad- leaved mixed forest (MF) and monsoon evergreen broad- leaved forest (MEBF). Results showed that driven by season- ality of precipitation, changes in soil acid phosphatase activi- ties coincided with the seasonal climate pattern, with signifi- cantly higher values in the wet season than in the dry season. Soil acid phosphatase activities were closely linked to forest successional stages, with enhanced values in the later stages of forest succession. In the dry season, soil acid phosphatase activities in the three forests showed a rising trend with in- creasing precipitation treatments. In the wet season, soil acid phosphatase activity was depressed by no precipitation treat- ment in the three forests. However, doubled precipitation treatment exerted a significantly negative effect on it only in MEBF. These results indicate that the potential transforma- tion rate of organic P might be more dependent on water in the dry season than in the wet season. A decrease in organic P turnover would occur in the three forests if there was a drought in a whole year in the future. More rainfall in the wet season would also be adverse to organic P turnover in MEBF due to its high soil moisture.

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