Effect of growth and subsequent decomposition of cyanobacteria on the transformation of phosphorus in submerged soils
Abstract
The effect of growth and subsequent decomposition of cyanobacteria (inoculated and indigenous) on changes in P fractions was studied in four soils under submerged condition.
The growth of cyanobacteria in soils caused an increase in organic P with concomitant decreases in Olsen-P, Al-P, Fe-P, and Ca-P, but little change in reductant-soluble Fe-P and occluded Al-P. Such changes have been attributed to the solubilization of different inorganic P fractions and subsequent assimilation of the released P by cyanobacteria. The decomposition of cyanobacterial biomass in soils caused an increase in Olsen-P with a simultaneous decrease in other P fractions, except the Ca-bound P. Development of intense reducing condition and formation of organic acids with chelating properties have been suggested as the cause of the above changes. Implications of such changes in P fractions due to the growth of cyanobacteria, and of the decomposition of the cyanobacterial biomass for the P nutrition of rice plants are discussed.
Key words
cyanobacteria P transformations submerged soilsPreview
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