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Effect of Biochar on Photosynthetic Microorganism Growth and Iron Cycling in Paddy Soil Under Different Phosphate Levels

Effect of Biochar on Photosynthetic Microorganism Growth and Iron Cycling in Paddy Soil Under Different Phosphate Levels

Rong Jia, Zhi Qu, Ping You, Dong Qu

Sci Total Environ. 2018 Jan 15;612:223-230.

PMID: 28850841

Abstract:

The surplus of exogenous and endogenous phosphate in submerged paddy fields could increase the risk of algal blooms, the photosynthesis of which might further influence the redox processes of iron. This work investigated the effects of biochar on photosynthetic microorganism growth and iron redox under different phosphate (P) levels to understand the dynamics of P and thereby control non-point source pollution by biochar addition. Paddy soils were incubated anaerobically with phosphate and biochar addition under controlled illumination conditions to determine the variation in chlorophyll a (Chl a), ferrous iron [Fe(II)], soil pH and water-soluble phosphate (W-P) with incubation time. Biochar addition significantly inhibited the photosynthetic microorganism growth, with Chl a decreased by 4.74-15.78mg·g-1 when compared with the control. Fe(III) reduction was significantly stimulated in response to biochar addition, while Fe(II) oxidation was inhibited because of the suppression of photosynthetic microorganism growth. The enhanced Fe(III) reduction and suppressed Fe(II) oxidation decreased the P solubility in the tested soils. These findings provide a cost-effective approach for inhibiting photosynthetic microorganism growth in paddy field and valuable insight into the effect of iron cycling on P retention for further management of eutrophication from exogenous and endogenous P loading.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AS2121307	Ferrous Iron in Water - WP			Price
AS2121318	Oxidation - Reduction - WP			Price

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