CONFLICTING PROCESSES IN THE WETLAND PLANT RHIZOSPHERE: METAL RETENTION OR MOBILIZATION?

摘要: Increasingly wetlands are used for treatment of metal-contaminated water or as a cover over metal-enriched mine tailings. Natural may also be contaminated with metals from anthropogenic sources. While wetland conditions tend to favorable immobilization metals, plants could influence metal mobility through redox and pH processes in the rhizosphere. Our current knowledge these is reviewed, focusing on question whether advantages growing sediments outweigh disadvantages. Wetland alter conditions, organic matter content so affect chemical speciation metals. Metals mobilized immobilized, depending actual combination factors, it extremely difficult predict which effects will actually have under given set conditions. However, while can extend several tens centimeters into sediments, there no reports suggesting large-scale mobilization by plants.