Effect of external phosphate addition on solid-phase iron distribution and iron accumulation in Mangrove Kandelia obovata (S. L.)

Jingna Du, Jingchun Liu, Haoliang Lu, Dennis A Hansell, Qiong Zhang, Wenyun Wang, Chongling Yan

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

In this study, a pot experiment was conducted to evaluate the effect of phosphate (PO<inf>4</inf> <sup>3−</sup>) addition on iron (Fe) cycling in mangrove ecosystem. Kandelia obovata (S. L.), one of the dominant mangrove species in the southeast of China, was cultivated in rhizoboxes under three different levels of P concentrations. Results showed the solid-phase Fe distribution and Fe(II)/Fe(III) values in both the root zone (rhizosphere) and bulk soil (non-rhizosphere) were comparable among all P levels (p > 0.05); P addition significantly decreased the pore water Fe content both in the rhizosphere and non-rhizosphere zone (p < 0.05); higher amount of reactive Fe was found in rhizosphere sediments, while in the non-rhizosphere sediments, higher concentration of crystalline Fe was determined; P significantly increased iron plaque formation and iron accumulation in K. obovata (S. L.) tissues (p < 0.05); P addition increased K. obovata (S. L.) biomass and chlorophyll content. It was suggested that P is implicated in the Fe cycling in mangrove plants; more reactive iron, higher abundance of root Fe-reducing bacteria (FeRB) and Fe-oxidizing bacteria (FeOB), and together with higher amount of K. obovata (S. L.) root organic acids exudation result in a rapid Fe cycling in rhizosphere, which contribute to comparable solid-phase iron distribution among different P levels.

Original languageEnglish (US)
Pages (from-to)13506-13513
Number of pages8
JournalEnvironmental Science and Pollution Research
Volume22
Issue number17
DOIs
StatePublished - May 6 2015

Keywords

  • Fe cycling
  • Fe(II)/Fe(III)
  • Mangrove
  • Phosphorus
  • Root
  • Solid-phase iron

ASJC Scopus subject areas

  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis
  • Pollution

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