A CASE STUDY ON SEDIMENTATION AND REGENERATION OF RIVERBORNE NUTRIENTS(C，N，P AND SI)IN TWO RESERVOIRS, SOUTHWESTERN CHINA
Two adjacent large-size reservoirs，the Wujiangdu Reservoir(WJDR)and the Dongfeng Reservoir (DFR)，both located on the main stream of the Wujiang River，were selected for a comparative study of nutrient regeneration near the sediment-water interface and nutrient flux across the sediment-water interface into the overlying water column.Water,pore water and sediment were collected from these two reservoirs and dissolved organic carbon(DOC)，NH4+，NO3-，PO43-， dissolved silica(DSi)were measured in the overlying water and pore water.Sedimentary particulate organic carbon(POC)and particulate organic nitrogen(PON)abundance and N/C ratios were determined from sediment core samples.Results from the two reservoirs show that processes of nutrient regeneration near the sediment-water interface are significantly different.As a result of rapid decomposition of algae-derivedlabileorganic matter in upper sediments，nutrient regeneration and upward flux is significantly larger in WJDR than in DFR：NH4+upward flux from sediment in WJDR was about 17 times higher than that in DFR；PO43-flux in WJDR was about 13 times above that in DFR；DOC flux in WJDR was 5 times larger than in DFR and DSi higher by 1 time.Our data also show that relative larger amount of Sedimentary OC(33％)，nitrogen(43％)and phosphorus (79％) were removed from the sediments during its burial history in WJDR；while results are relative lower for DFR with the removal of sedimentary OC(4.5％)，N(11％)and P(33％).
Reservoir Nutrients regeneration Sediment-water Interface
Wang Yuchun
Department of Water Environment China Institute of Water Resources and Hydroelectric Power Research.Beijing,100038
国际会议
High-level International Forum on Water Resources and Hydropower(第一届国际水利水电高层论坛)
北京
英文
480-486
2008-10-17（万方平台首次上网日期，不代表论文的发表时间）