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Denitrification potential of Cyperus malaccensis marsh soil in Minjiang River estuary of East China.

LIU Rong-fang1, ZHANG Lin-hai1,2, LIN Xiao1,2, MOU Xiao-jie3, ZENG Cong-sheng1,2**   

  1. (1School of Geographical Science, Fujian Normal University, Fuzhou 350007, China; 2Research Centre of Wetlands in Subtropical Region, Fujian Normal University, Fuzhou 350007, China; 3Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China)
  • Online:2013-11-10 Published:2013-11-10

Abstract: By using submerged anaerobic incubation method, this paper studied the soil denitrification rate, denitrification ratio (denitrifying activity) and its contribution to the soil nitrogen loss in Cyperus malaccensis marsh in the Minjiang River estuary of East China. The denitrification rate in different soil layers varied with incubation time in firstorder exponential decay model (R2≥0.90), and was the maximum in 5-10 cm soil layer. The denitrifying activity in different soil layers increased gradually over time, and was the highest (93.92%) in 5-10 cm soil layer. The nitrogen loss rate in different soil layers was in accordance with the denitrification rate and denitrifying activity. The contribution rate of denitrification to the nitrogen loss was higher in upper soil layers than in deeper soil layers. The differences in the denitrification rate and denitrifying activity in each soil layer were related to the soil physical and chemical properties, being positively correlated with soil pH and the contents of soil clay, organic matter, NO3--N, and WHC, but negatively correlated with soil sand content.