Modification of sediment redox potential by three contrasting macrophytes: implications for phosphorus adsorption/desorption

摘要: Freshwater macrophytes may increase sediment redox potential and the affinity of sediments for phos- phorus through radial oxygen loss from their below-ground biomass. This study demonstrated that ability to alter differs between macrophytes, according capacity transport oxygen. Of emer- gent Typha domingensis increased (218 mV above bare sediment) a greater extent than Bolboschoenus caldwellii (41 sediment). However, inhibition convective flow in T. reduced its oxidizing by 78 mV. In contrast, Potamogeton crispus, submerged macrophyte, had no influence on potential. The presence also phosphorus uptake water column 0.88 mg P m −2 day −1 , sediments. addition, inundation predictably decreased 175 −176 over 42-day period. Similarly, addition cel- lulose (10 L ) 42 Consequently, deposition organic debris counteract effects have limited oxygen, such as P. crispus. Results suggest play an important role facilitating restoration freshwater systems.