Study on the changes of nitrogen,iron and manganese in riverbed sediments and their storage patterns in artificial groundwater recharge
This paper reveals the changes in the chemical composition of riverbed sediments at different depths after groundwater recharge by analyzing the changes in the percentage of total nitrogen,iron and manganese,and fugitive forms in the riverbed sediments of upstream and downstream reaches of a river,with respect to the method of artificial groundwater re-charge.The results show that,percentage of nitrogen forms in sediments differed significantly upstream and downstream,with total nitrogen content gradually increasing downstream,and river pollution may have contributed to the increase in nitrogen content.The non-transformable-nitrogen(Res-N)has a high content at all depths;From upstream to downstream,the mean values of total iron and total manganese contents were gradually decreasing,carbonate-bound state-Fe(Carb-Fe)and ion-exchanged state-Fe(EXC-Fe)varied less between the upstream and downstream,and manganese contents in the riverbed sediment were mainly dominated by non-transformable state-Mn(Res-Mn).The results can provide an impor-tant reference for river ecological environment protection and management.
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