Subjects: Biology >> Botany >> Applied botany submitted time 2021-12-19 Cooperative journals: 《广西植物》
Abstract： Heavy metal pollution in Kandelia obovata ecosystem is an important part of coastal wetland research. In order to explore the health risk and heavy metal pollution of Kandelia obovata wetland of different origins in eastern Fujian，this study explored the content characteristics of heavy metals in surface sediments of different origins of Kandelia obovata wetlands and assessed their health risks in eastern Fujian by using the pollution load index method and human health risk assessment method. The results were as follows: (1) The average content of heavy metals in surface sediments of Kandelia obovata natural forest wetland was Zn（102.38 mg·kg-1）> Pb（101.53 mg·kg-1）> Cu（11.72 mg·kg-1）> Cd（0.91 mg·kg-1）. The order of heavy metal content in surface sediments of Kandelia obovata plantation was Zn （ 152.81 mg·kg-1）> Pb（105.83 mg·kg-1）> Cu（16.38 mg·kg-1）> Cd（1.33 mg·kg-1）. (2) The regional pollution load index (IPL zone) of heavy metals in surface sediments of Kandelia obovata natural forest was lower than that of Kandelia obovata plantation, and the corresponding pollution levels of Kandelia obovata plantation and natural forest were both 1, which belonged to moderate pollution. (3) The non-carcinogenic risk (Non carcinogenic Risk, RN) of heavy metals in surface sediments of Kandelia obovata wetland to adult males and adult females was lower than 1, and the non-carcinogenic risk to human body was very low. The RN of Pb element to children was higher than 1, it would cause non-carcinogenic risk to children. The carcinogenic risk (Cancer Risk, RI) of Cd to adult males, adult females and children was greater than 1.0×10-6, and there was a serious carcinogenic risk to the human body. The results indicate that heavy metal pollution of wetlands in eastern Fujian was serious. Therefore, we should control the pollutant emission around the wetland and purify the wetlands. In addition, adding the health risk assessment of heavy metals to the evaluation of Kandelia obovata wetland ecosystem will help to strengthen the ecological protection and risk management of Kandelia obovata.
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