Laboratory drying of organic-matter rich soils: Phosphorus solubility effects, influence of soil characteristics, and consequences for environmental interpretation

Styles, David; Coxon, Catherine

doi:10.1016/j.geoderma.2006.03.017

Cited by 44 publications

(25 citation statements)

References 44 publications

(68 reference statements)

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“…P concentrations have been shown to increase upon rewetting dry soil, primarily due to higher concentrations of organic P forms derived from the microbial biomass (Blackwell et al 2009;Sparling et al 1985;Styles and Coxon 2006;Turner and Haygarth 2001). However, these observations are not supported by the current study where DRW had no effect on P resin , TEP, and EOP.…”

Section: Phosphorus and Carbon Availabilitycontrasting

confidence: 90%

“…However, these observations are not supported by the current study where DRW had no effect on P resin , TEP, and EOP. As highlighted by Styles and Coxon (2006) extractions for P determination performed on remoistened soils, as used here, are likely to show quantitatively smaller P pulses than those performed on air-dried soil (as used by e.g. , Turner et al 2002.…”

Section: Phosphorus and Carbon Availabilitymentioning

confidence: 89%

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Changes in water content of two agricultural soils does not alter labile P and C pools

et al. 2011

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Aims An incubation study was conducted to investigate how changes in soil water content affect labile phosphorus and carbon pools, mineralisation patterns and microbial community composition. Methods Two soils from different climatic histories were subjected to four long-term (15 weeks) soil water regimes (constant field capacity (m); 3 dryrewet (DRW) cycles evenly spaced (intermittent, int); 3 DRW cycles with a shorter interval after a long dry period (false break, fb); constantly air-dry (d)) (incubation period 1). In the subsequent incubation period 2, a set of cores from each treatment were subjected to one DRW cycle (air-dry for 7 day; field capacity for 14 day) or maintained at field capacity.Results Long-term soil water regime altered soil respiration with the largest CO 2 pulse occurring in soil with the longest dry period. However, changing the distribution of the 3 DRW events within incubation period 1 (int/fb) did not alter cumulative CO 2 . In addition, DRW during incubation period 2 did not affect cumulative CO 2 in either treatment (m, int, fb, d) (except for Hamilton int). Our results show that carbon and phosphorus availability and the size and community composition of the microbial biomass were largely unaffected by fluctuating soil water content. Conclusions Changes in soil water content altered respiration, phosphatase activity and microbial C:P ratio and indicate physiological and/or functional changes in the microbial community. However, it appeared that these would have little impact on plant P availability.

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Section: Phosphorus and Carbon Availabilitycontrasting

confidence: 90%

Section: Phosphorus and Carbon Availabilitymentioning

confidence: 89%

Changes in water content of two agricultural soils does not alter labile P and C pools

et al. 2011

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“…From the environmental point of view, in aquatic systems, phosphorus is determined on the colorimetric reaction of phosphate with an acidified molybdate reagent to yield phosphomolybdate heteropolyacid, which is then reduced to an intensely coloured blue compound and is specified as 'dissolved reactive phosphorus' (Robards et al 1994, Worsfold et al 2005, Soldat et al 2009, Regan et al 2010 or as 'dissolved molybdate-reactive phosphorus' (Styles and Coxon 2006). It is supposed that the molybdate-reactive phosphorus should be mainly equal to the inorganic orthophosphate.…”

Section: Resultsmentioning

confidence: 99%

“…The difference between total phosphorus and reactive phosphorus is termed 'unreactive phosphorus' . The dissolved unreactive phosphorus represents mainly organic form of phosphorus and P fixed into an organic and an inorganic particles ('particulate phosphorus') which passed procedure of filtration (Worsfold et al 2005, Styles and Coxon 2006, Blackwell et al 2009). In our case of water extract of soils, the great difference between the colorimetric and ICP phosphorus in comparison with Mehlich 3 and NH 4 -acetate extracts indicates a possibility of a significant part of 'particulate phosphorus' due to limited aggregation of soil particles in the low ionic strength of water extract (Ebeling and Davis 2009).…”

Section: Resultsmentioning

confidence: 99%

Differences in available phosphorus evaluated by soil tests in relation to detection by colorimetric and ICP-AES techniques

Matula¹

2010

Plant Soil Environ.

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Differences in the evaluation of soil phosphorus status by three soil tests (Mehlich 3, extraction with NH 4 -acetate and water extraction) were tested on 63 agricultural soils with different agrochemical characteristics from the territory of the Czech Republic. Differences between the colorimetric determination of phosphorus and ICP technique were studied. The median of the values of phosphorus supply in soils determined by soil tests was considerably different. Compared to the colorimetric detection of water extraction of soils the median of the NH 4 -acetate test showed 2.2 times higher values and in Mehlich 3 test the values were 34.8 times higher. The largest difference between the end-point analytical techniques of phosphorus determination, colorimetry and ICP-AES, was observed in the soil test of water extraction. The median of the values determined by ICP-AES was higher by 47%. In NH 4 -acetate extraction of soils the median of the measured values of phosphorus was higher by 12% and in Mehlich 3 extraction by 7%. Differences in phosphorus concentrations determined by colorimetry and by ICP-AES increased as the phosphorus supply in soils decreased. When the supply of 'available' phosphorus in soil is given, it is always necessary to specify the used soil test including the end-point analytical technique of phosphorus determination to avoid the misleading interpretation of results. The problem of phosphorus in agriculture and in the environment requires thorough revision and methodical standardization.

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“…It is important that the way in which soils respond to such perturbations is better understood as there are implications for both P availability and loss to surface waters from soils. Air-drying is commonly used for long periods storage of P before extraction and analysis, but this was found to increase water and NaHCO 3 -extractable P in soil compared with field moist soil (Turner et al 2001, Nguyen and Marschner 2005, Peltovuori and Soinne 2005, Styles and Coxon 2006, Turner et al 2007, Soinne et al 2010. Although the mechanisms responsible for this effect are not clear, changes in P fractions and sorption may be important for soil P availability and the quality of water.…”

mentioning

confidence: 99%

Effects of air-drying and freezing on phosphorus fractions in soils with different organic matter contents

Xu¹,

Sun²,

Xu³

et al. 2011

PLANT SOIL ENVIRON

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Little is known about the effects of air-drying and freezing on the transformation of phosphorus (P) fractions in soils. It is important that the way in which soils respond to such perturbations is better understood as there are implications for both P availability and loss to surface waters from soils. In this study, the effects of air-drying and freezing were investigated using two soils, one being a forest soil (FS) high in organic matter and the other being a sterile soil (SS) low in organic matter. Soil P was fractionated using a modified Hedley fractionation method to examine the changes of phosphorus fractions induced by air-drying and freezing. Generally, there were no significant differences of total phosphorus among the three treatments (CV% < 10%). Compared with field moist soils, freezing the soil evoked few changes on phosphorus fractions except that the resin-P increased in FS soil. On the contrary, air-drying significantly changed the distribution of phosphors fractions for both soils: increased the labile-P (especially resin-P) and organic-P (NaHCO 3 -Po, NaOH-Po and Con.HCl-Po) at the expense of NaOH-Pi and occlude-P (Dil.HCl-P and Con.HCl-Pi). Resin-P significantly increased by 31% for SS soil and by 121% for FS soil upon air-drying. The effect of air-drying seemed to be more pronounced in the FS soil with high organic matter content. These results indicated that drying seem to drive the P transformation form occlude-P to labile-P and organic-P and accelerated the weathering of stable P pool. This potentially could be significant for soil P supply to plants and P losses from soils to surface waters under changing patterns of rainfall and temperature as predicted by some climate change scenarios.

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Laboratory drying of organic-matter rich soils: Phosphorus solubility effects, influence of soil characteristics, and consequences for environmental interpretation

Cited by 44 publications

References 44 publications

Changes in water content of two agricultural soils does not alter labile P and C pools

Changes in water content of two agricultural soils does not alter labile P and C pools

Differences in available phosphorus evaluated by soil tests in relation to detection by colorimetric and ICP-AES techniques

Effects of air-drying and freezing on phosphorus fractions in soils with different organic matter contents

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