Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 21, Issue 1, Pages 355-365Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-013-1910-8
Keywords
Cadmium; Phosphorus; Organic acid; Mangrove; Rhizosphere
Categories
Funding
- National Important Scientific Research Program of China [2013CB956504]
- National Natural Science Foundation of China [31170471, 30970527]
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This study focused on the cadmium (Cd) tolerance of mangroves with application of phosphate (P) in order to explore whether exogenous P can alleviate Cd stress on these intertidal species. Kandelia obovata (S. L.) seedlings were cultivated in rhizoboxes under different levels of Cd and P concentrations. The speciation distributions of Cd in the rhizosphere and non-rhizosphere sediments were examined by sequential extraction procedures; organic acid in plant tissues and soil solution was measured by high-performance liquid chromatography; Cd and P accumulation in the plants was also determined. Results showed that considerable differences existed in Cd speciation distributions between rhizosphere and non-rhizosphere sediments. Root activity influenced the dynamics of Cd, P application increased the organic acid content in root tissues, P also increased Cd accumulation in roots whilst lowering Cd translocation from root to the above-ground tissues, and a significant positive correlation was found between Cd and P in roots (r = 0.905). It is postulated that Cd detoxification of K. obovata (S. L.) is associated with higher Cd immobilization in the presence of higher P and organic acid contents in root tissue.
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