Response of biogeochemical indicators to a drawdown and subsequent reflood.

摘要: Temporal oscillations in hydrology are a common occurrence wetlands and can result alternating flooded drained conditions the surface soil. These water levels stimulate microbial activities mobilization redistribution of significant amounts carbon (C), nitrogen (N), phosphorus (P). The goal this study was to experimentally simulate drawdown reflood marsh soil from nutrient-enriched site reference wetland (Blue Cypress Marsh Conservation Area, Florida). better understand changes biogeochemistry present these soils as hydrological fluctuations. Measurements dissolved reactive (DRP), ammonia, nitrate floodwater indicated significantly higher (alpha = 0.05) NH(4)(+) DRP fluxes site; floodwaters cores both sites contained NO(3)(-) concentrations (9.6 mg N L(-1)), which rapidly consumed over core incubation period (30 d). Water level reflooding initially stimulated biomass, methanogenic rates, extracellular enzyme (acid phosphatase beta-glucosidase). anaerobic metabolic (CO(2)) where enhanced by reflood, resulting roughly equivalent rates aerobic respiratory (CO(2)), presumably function high column levels. This illustrates that event cycles hydrolytic enzymes microbiological communities soils.