科研之友
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摘要
Mangrove wetlands serve as both a sink and source for arsenic (As), as mangrove plants are able to uptake and accumulate As. The present study used pot experiments to evaluate As accumulation and translocation in mangrove (Aegiceras corniculatum L.) seedlings grown in As contaminated soils. Results indicated that A. corniculatum seedlings grew normally under As stress with minute growth inhibition and biomass reduction at different As treatment concentrations in a range of 0-150 mg(center dot)kg(-1). As concentrations in roots, stems and leaves were increased with increasing As treatment concentrations, but As accumulated mainly in roots, with accumulation rates of 74.54%-89.26% of the total As accumulation. In particular, relatively high bioconcentration factor (BCF) in root (2.12-1.79), low BCF in stem (0.44-0.14) and leaf (0.06-0.01), and thereby a low translocation factor (TF) in stem/root (0.21-0.08) and leaf/root (0.02-0.008) were observed. These results demonstrated that A. corniculatum is an As excluder with the innate capacity to tolerate As stress and root tissues may be employed as a bio-indicator of As in polluted sediments. Additionally, A. corniculatum is a potential candidate mangrove species for As phytostabilization in tropical and subtropical estuarine wetlands.
