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Metal release/accumulation during the decomposition of Potamogeton crispus in a shallow macrophytic lake
Changes in metal concentrations in the litter of Potamogeton crispus were monitored during a consecutive 40-day in situ decomposition experiment using the litterbag method. The accumulation index was calculated and used to indicate the changes in the metals in litter. The results showed that the concentrations of Al, Cd, Cr, Fe, Mn, and Pb in litter increased significantly during the decomposition, while Cu and Zn concentrations decreased dramatically. Significant positive correlations were found between the concentrations of Al, Cr, Fe, and Mn and between Cu and Zn. Moreover, Cu and Zn both negatively correlated with Al and Fe. The remaining dry mass was negatively correlated with Al and Fe concentrations but positively correlated with Cu and Zn concentrations. Generally the accumulation index values of metals other than Al were less than one, indicating that the litter of P. crispus acted as a source of metals to the surrounding water body. Al was the only metal that showed continuous net accumulation in litter. The net accumulation of Fe and Mn in litter during the last 10days of the experiment may indicate the precipitation of Fe- and Mn-oxides. It was estimated that 160g/m(2) (dry weight) P. crispus was decomposed in 40days. This was equivalent to releasing the following amounts of metals: 0.01mg Cd, 0.03mg Cr, 0.71mg Cu, 0.55mg Mn, 0.02mg Pb and 13.8mg Zn into surrounding water, and accumulating 149mg Al and 11mg Fe, in a 1m(2) area.
Metal release/accumulation during the decomposition of Potamogeton crispus in a shallow macrophytic lake
Changes in metal concentrations in the litter of Potamogeton crispus were monitored during a consecutive 40-day in situ decomposition experiment using the litterbag method. The accumulation index was calculated and used to indicate the changes in the metals in litter. The results showed that the concentrations of Al, Cd, Cr, Fe, Mn, and Pb in litter increased significantly during the decomposition, while Cu and Zn concentrations decreased dramatically. Significant positive correlations were found between the concentrations of Al, Cr, Fe, and Mn and between Cu and Zn. Moreover, Cu and Zn both negatively correlated with Al and Fe. The remaining dry mass was negatively correlated with Al and Fe concentrations but positively correlated with Cu and Zn concentrations. Generally the accumulation index values of metals other than Al were less than one, indicating that the litter of P. crispus acted as a source of metals to the surrounding water body. Al was the only metal that showed continuous net accumulation in litter. The net accumulation of Fe and Mn in litter during the last 10days of the experiment may indicate the precipitation of Fe- and Mn-oxides. It was estimated that 160g/m(2) (dry weight) P. crispus was decomposed in 40days. This was equivalent to releasing the following amounts of metals: 0.01mg Cd, 0.03mg Cr, 0.71mg Cu, 0.55mg Mn, 0.02mg Pb and 13.8mg Zn into surrounding water, and accumulating 149mg Al and 11mg Fe, in a 1m(2) area.
Metal release/accumulation during the decomposition of Potamogeton crispus in a shallow macrophytic lake
Deng, Huanguang (author) / Zhang, Ju / Chen, Shiyue / Yang, Liwei / Wang, Dongqi / Yu, Shiyong
2016
Article (Journal)
English
Comprehensive operation of the eco-hydrological processes in shallow macrophytic lakes
| BASE | 2017
Comprehensive operation of the eco-hydrological processes in shallow macrophytic lakes
| HENRY – Federal Waterways Engineering and Research Institute (BAW) | 2017