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Potential contribution of lysed bacterial cells to phosphorus solubilisation in two rewetted Australian pasture soils

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Abstract

Soil drying renders considerable amounts of phosphorus soluble upon rewetting, which may be partly derived from lysed microbial cells. Using direct bacterial cell counting in water and tetra-sodium pyrophosphate extracts of two Australian pasture soils, we found that almost all extractable cells were lysed following the rewetting of dry soils. The amounts of phosphorus in the lysed cells corresponded closely to the increases in water-extractable phosphorus following soil drying, suggesting that bacterial cell lysis is a major source of the released phosphorus.

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    Citation Excerpt :

    Sparling et al. (1987) found that microorganisms had a limited influence on the increase in soil Olsen-IP after DRW in a wet area with an annual rainfall of over 400 mm, as in the present study. Turner et al. (2003b) reported that most of the P released due to the death of microorganisms after DRW was in the form of organic P. In this study, the increase in Olsen-IP after DRW was significantly positively correlated with ΔFeox (n = 24, R = 0.721, P < 0.01).

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