水产学报2018，Vol.42Issue(2)：246-256,11.DOI:10.11964/jfc.20161210622
主养草鱼与主养黄颡鱼池塘沉积物—水界面氮磷营养盐通量变化及与环境因子的关系
Diffusion fluxes of nitrogen and phosphorus across sediment-water interface in different aquaculture model ponds
摘要
Abstract
Ctenopharyngodon idella and Pelteobagrus fulvidraco are considered as two economically important aquaculture species in China with the largest production. The sediment-water interface in aquatic systems is a bridge connecting bottom sediments with the overlying water column. The transition zone between oxygenated overlying water and anoxic, or anaerobic, sediments forms over a gradient of just a few millimeter sand and can easily be disturbed by mechanical mixing (bioturbation). To determine the seasonal variance of nitrogen and phos-phorus exchange in different aquaculture model ponds and explore the relationship between nitrogen and phos-phorus fluxes and environment factors of overlying water in two polyculture systems,C. idella andP. fulvidraco aquaculture models ponds, we studied by in situ Observation device of nutrient flux in sediment-water interface from April to October of 2013. In situ experiments, benthic fluxes of nutrients at the sediment-water interface were measured, and its related factors were analyzed. During our experiment, nitrate, nitrite and TN were taken up by sediment in the beginning of the culture period (from Apr. to Jun.), while it changed to release from sediments to water in the middle and later stages of the culture period. Meanwhile, fluxes of PO3-4 and TP presented the simil-ar trends. Results also showed that the differences of concentration variation range of NO-2-N NO-3-N and PO3-4P were not significant between the two aquaculture models, however there were significant differences of NH+4-N, TN and TP fluxes at sediment-water interface. Otherwise, there was significantly positive relationship between ni-trite and nitrate fluxes and DO concentration, while there was negative relationship between NH+4-N and PO3-4-P fluxes and DO concentration. Elevated temperature can promote different forms of nitrogen and phosphorus fluxes in aquacultural ponds.关键词
草鱼/黄颡鱼/沉积物—水界面/氮/磷/扩散通量Key words
Ctenopharyngodon idella/Pelteobagrus fulvdraco/sediment-water interface/nitrogen/phosphorus/diffusion fluxes分类
生物科学引用本文复制引用
皮坤,张敏,李保民,李庚辰..主养草鱼与主养黄颡鱼池塘沉积物—水界面氮磷营养盐通量变化及与环境因子的关系[J].水产学报,2018,42(2):246-256,11.基金项目
国家大宗淡水鱼类产业技术体系专项(CARS-45) （CARS-45）
公益性行业(农业)科研专项(201203083) （农业）
The Earmarked Fund for China Agriculture Research System (CARS-45) （CARS-45）
Special Fund for Agro-scientific Research in the Public Interest Project (201203083) （201203083）
