Interactive effects of cadmium and pyrene on contaminant removal from co-contaminated sediment planted with mangrove Kandelia obovata (S., L.) Yong seedlings.
The interactive effects of cadmium (Cd) and pyrene (Pyr) on contaminant removal from co-contaminated sediment planted with Kandelia obovata were investigated by a pot experiment. We found that dry weight of plant was significantly decreased under high level of Cd-Pyr combined stress. High Pyr caused the increase of Cd toxicity to K. obovata under high Cd stress because more Cd translocated to the plant tissues. Cd toxicity inhibited Pyr degradation in co-contaminated sediments and higher Pyr degradation was found in the rhizosphere than that in the non-rhizosphere sediment under high Cd treatment. The total number of microorganisms in sediments tended to decrease with increasing Cd under Cd-Pyr combined stress and more amount existed in the rhizosphere sediment. In conclusion, Cd and Pyr removal by K. obovata can influence interactions between these two pollutants in co-contaminated sediment. This suggests that this mangrove can effectively remedy sites co-contaminated with these two types of contamination.
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, People's Republic of China.
Wenyun
W
Wang
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, People's Republic of China.
Xuefeng
X
Zhang
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, People's Republic of China.
Jing
J
Huang
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, People's Republic of China. Electronic address: ycl@xmu.edu.cn.
Chongling
C
Yan
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, People's Republic of China.
Qiong
Q
Zhang
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, People's Republic of China.
Haoliang
H
Lu
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, People's Republic of China.
Jingchun
J
Liu
D002104:Cadmium / Q000737:chemistry / Q000633:toxicity*; D019015:Geologic Sediments / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry / Q000633:toxicity*; D011721:Pyrenes / Q000737:chemistry / Q000633:toxicity*; D043982:Rhizophoraceae / Q000187:drug effects* / Q000254:growth & development; D036226:Seedlings / Q000187:drug effects* / Q000254:growth & development; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000633:toxicity
D011721:Pyrenes; D014874:Water Pollutants, Chemical; D002104:Cadmium; C030984:pyrene
Cadmium; Co-contaminated; Kandelia obovata (S., L.) Yong; Mangrove; Pyrene; Rhizoremediation