AbstractAbiotic data, such as physical and chemical variables and inorganic nitrogen status were obtained from substrate compartments in four environments in the Lobo reservoir wetlands. The sampling sites were selected by‘in‐situ’observation of the hydrological features, the degree of‘openness’to the flow‐through of water and macrophyte communities. For each site, three compartments were considered: the sediment, the interstitial water and the overlaying water at the sediment water interface. The pH, electrical conductivity, dissolved oxygen, nitrate, nitrite and ammonium nitrogen, organic matter and moisture content were analyzed in the substrate. The spatial distribution of these properties was associated with the hydrological and nutritional flooding conditions. Lobo wetland sediment may be an efficient buffer system due to its high interstitial and exchangeable ammonium con
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