摘要：Riverside wetland in the lower reaches of Songhua River has suffered intense damage resulting in rapid degeneration of the water purification system related to human destruction and water pollution. Violent fluctuations in water levels may lead to worsening water quality effects and destruction of plant growth. Ecological floating beds provide an effective way to overcome the problems, yet limited information regarding purification has been obtained in the open water-environment. The ability of Sphagnum survival and its correlation to nutrients enrichment in violently fluctuating riverside wetland water as applied to the ecological floating bed are investigated in this study. Ecological floating beds, with Sphagnum ;fall〇K and Sphagnum squarossum, were chosen for nitrogen (N) and phosphorus (P) enrichment. The results indicated that changes of water quality (high N low P, low N high P) resulting from water level fluctuations in test areas were beneficial for the survival of Sphagnum species, especially in flood periods that high carbon content of water could effectively stimulate the growth of species. Following four months of field tests, the amounts of N and P enrichment in squarossum were 2.29 and 0.82 mg/g dry weight, respectively, while in Sphagnum fallax were 1.98 and 0.64 mg/g dry weight. N enrichment was superior to P for both Sphagnum moss types. The release of nutrients, especially P, can be controlled effectively by harvesting Sphagnum species in early winter. This study could be useful for improved understanding of water restoration in violent fluctuating degraded riverine wetland by eutrophic Sphagnum mosses.
关键词：Sphagnum moss;ecological floating bed;degraded wetland;fluctuating water level;removal
