4.7 Article

pH is the dominant factor controlling the levels of phytate-like and DNA-like phosphorus in 0.5 M NaHCO3-extracts of soils: Evaluation with phosphatase-addition approach

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GEODERMA
卷 398, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.geoderma.2021.115113

关键词

Phosphatase hydrolysis; Organic phosphorus; Phytate; DNA; Phosphorus availability; Andosol

资金

  1. JSPS KAKENHI [JP24510012]

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This study analyzed the concentrations of phosphatase-hydrolyzable Po in different soil types and found that soil pH plays a significant role in the increase of phytate-like P and DNA-like P in 0.5 M NaHCO3-extracts.
To elucidate the factor(s) controlling the concentrations of readily available organic phosphorus (Po) in soils, we assessed the phosphatase-hydrolyzable Po pools in 0.5 M NaHCO3-extracts of arable and forest soils and evaluated their association with soil properties in several soil types collected in Japan. Concentrations of phosphatase-hydrolyzable Po (simple monoester P, phytate like-P, and DNA-like P) in 0.5 M NaHCO3-extracts were determined using three phosphatases with different substrate specificities. Monoester P (i.e., simple monoester P and phytate like-P) was dominant in the phosphatase-hydrolyzable Po of 0.5 M NaHCO3-extracts in all soils. In monoester P, the concentration of phytate-like P was greater than that of simple monoester P in all soil types except Fluvisols. Both phytate-like P and DNA-like P in 0.5 M NaHCO3-extracts significantly increased with decreasing soil pH, suggesting that soil pH would play a crucial role in determining the availability of Po in soils.

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