摘要：Acorus calamus, Zizania latifolia, Phragmites communis and Typha latifolia are four common emergent macrophytes in some wetlands. To evaluate the influence of the four emergent macrophytes on sediment nutrient loading, a field experiment was conducted. Sediment physicochemical characters, nutrient distribution properties and -N and -P fluxes were investigated. Compared with the control without macrophytes, sediment moisture content, porosity, loss on ignition and total P were higher, while wet bulk density, total N, -N and -N were lower. Concentrations of -N and -P in interstitial water were higher than in overlying water, indicating that they were diffusing from sediment to overlying water. -N and -P concentrations near the sediment surface displayed exponential increases with sediment depth and reached a maximum at 5–8 cm. Fluxes of -N and -P were also lower in sediment with macrophytes. Among the four macrophytes, sediment moisture content and porosity increased, while wet bulk density decreased with A. calamus and Z. latifolia. N and P contents were lower with T. latifolia, while -N and -N were lower with A. calamus and Z. latifolia. A. calamus and T. latifolia had lower -N concentration in interstitial water, and A. calamus had lower -P. Compared with other treatments, T. latifolia restricted -N and -P release effectively due to their lower fluxes (0.082 and 0.010 mg m −2 d −1 ). This study also elucidates the differences among the four macrophytes in affecting sediment nutrient loading, which is meaningful for macrophyte selection in wetland restoration.
