Notice of Retraction: The Effect of Water Level on Microbial Activity and Active Organic Carbon under Calamagrostis angustifolia Marsh in Sanjiang Plain, China

Abstract

Water plays a key role to sustain the stability of wetland and change of water level will influence soil microbial activity and plant growth. In order to investigate the response of aboveground biomass, soil enzyme activities and soil active organic carbon including microbial biomass (MBC), dissolved organic carbon (DOC) and labile organic carbon (LOC) to water gradient in freshwater marsh, the field simulation experiment with soil water level treatments of -5cm (W1), 0cm (W2), 5cm (W3) and 10cm (W4) were carried out under a typical Camagrostis angustifolia marsh of Sanjiang Plain in China. C. angustifolia was shown to be best adapted to the water level of 0 cm, at which its aboveground biomass was the highest and the activities of invertase, amylase, acid phosphatase and urease in this condition were also greater than those in waterlogged soil, moreover waterlogged soils inhibited their activities and the inhibiting effect was enhanced with water level increasing. The influence of water level on MBC was similar to that on enzymes. That is, waterlogging suppressed the growth of microorganism and the content of MBC obviously decreased along with the increase of water level. When the water level was 0 cm, the content of MBC was significantly higher than other treatments (P <;0.05). Nevertheless, the content of DOC and LOC increased as the water level rose. By Pearson analysis, the activities of marsh soil invertase, amylase, acid phosphotase and urease were significant positive correlation with aboveground biomass and MBC(P <;0.05), however, negative correlations with the content of DOC and LOC.