Mangrove wetlands can reduce heavy metal pollution by trapping heavy metals.In this study,the concentration,transport and bioaccumulation of Cr,Cd,Cu,Zn and Pb in the sediments and different parts of Aegiceras cornicu...Mangrove wetlands can reduce heavy metal pollution by trapping heavy metals.In this study,the concentration,transport and bioaccumulation of Cr,Cd,Cu,Zn and Pb in the sediments and different parts of Aegiceras corniculatum at four different sites in the Qinzhou Bay in southwestern China were investigated.The results showed that although the potential ecological risk of all five heavy metals was slight,the concentration of Cr was at a moderate pollution level due to the emissions of industries and aquaculture waste water.Core sediment records indicated that the concentrations of heavy metals at the depth of 0–20 cm were relatively high,showing an increasing trend of heavy metals over the past 20–30 years.Cr,Cu,Pb and Cd accumulated mainly in the roots of A.corniculatum,while Zn accumulated mainly in the stems.Aegiceras corniculatum showed the strongest transport capacity for Zn and Cu and the strongest bioaccumulation ability for Cd.Compared with other mangrove communities,A.corniculatum can be chosen as a restoration species in tropical and subtropical coastal zones polluted by Zn,Cu and Cd.展开更多
基金The National Basic Research Program(973 Program)of China under contract No.2010CB951203the National Natural Science Foundation of China under contract Nos 41201179,41201525,41907320 and 41901226+1 种基金the foundation of the State Key Laboratory of Estuarine and Coastal Research under contract No.SKLEC-KF-201309the foundations of Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf,Beibu Gulf University under contract Nos 2018TS01 and 2018TS04
文摘Mangrove wetlands can reduce heavy metal pollution by trapping heavy metals.In this study,the concentration,transport and bioaccumulation of Cr,Cd,Cu,Zn and Pb in the sediments and different parts of Aegiceras corniculatum at four different sites in the Qinzhou Bay in southwestern China were investigated.The results showed that although the potential ecological risk of all five heavy metals was slight,the concentration of Cr was at a moderate pollution level due to the emissions of industries and aquaculture waste water.Core sediment records indicated that the concentrations of heavy metals at the depth of 0–20 cm were relatively high,showing an increasing trend of heavy metals over the past 20–30 years.Cr,Cu,Pb and Cd accumulated mainly in the roots of A.corniculatum,while Zn accumulated mainly in the stems.Aegiceras corniculatum showed the strongest transport capacity for Zn and Cu and the strongest bioaccumulation ability for Cd.Compared with other mangrove communities,A.corniculatum can be chosen as a restoration species in tropical and subtropical coastal zones polluted by Zn,Cu and Cd.
