Author(s): Yimin Zhang; Qian Chen; Jianying Chao; Yuexiang Gao
Keywords: Eutrophication; Bellamaya sp; Zoobenthos; Emergent plants; Sediment
Abstract: Laboratory simulation experiments were carried out to study the temperature factor affecting nutrient release of Bellamaya sp, and other process, such as nitrogen and phosphorus cycling, suspended substance in water column, food intake and output in the system. It showed that temperature had great influence on nutrient release of Bellamaya sp. The release rate of total nitrogen and dissolved nitrogen increased with small amplitude, and that of total phosphorus and dissolved phosphorus rose greatly as the temperature went up (P 0.05). Outdoor tests were carried out to study the effects of collaborative remediation by Bellamaya sp and emergent plants (Ipomoea aquatica Forsk, I. sibirica) in eutrophic waterbody. It showed that Vellamaya sp and emergent plants had excellent removal capacities of suspended substance (SS), total nitrogen (TN) and total phosphorus (TP) respectively. The concentration of total nitrogen (TN) and total phosphorus (TP) were declined because of the input of the snails. I. sibirica’s removal rate of nitrogen was better than Ipomoea aquatica Forsk’s, but Ipomoea aquatica Forsk’s removal rate of phosphorus is better than I. sibirica.