Organic P in temperate forest mineral soils as affected by humus form and mineralogical characteristics and its relationship to the foliar P content of European beech

Greater amounts of 0.5 M NaHCO3 and water-extractable P were found in soil beneath a cattle feedlot located on an alkaline sandy soil than in soil in an adjacent non-manured field. The 0.5 M NaHCO3-extractable P contents of the feedlot soil samples were greater than for the adjacent field to a depth of 120–150 cm, suggesting that P from the manure had moved to this depth. Water extracted very little P from all field samples and the feedlot samples obtained below 120 cm. Concentration of total P in the feedlot soil was usually greater than in the corresponding field soil. The field soil contained more organic P than the feedlot soil at depths of 0–90 cm. Organic P concentrations at the 0 to 15-cm depths were 268 and 56 ppm for the field and feedlot sites, respectively. The organic C:N:P ratios for the 0 to 15-cm feedlot and field samples were 214:18:1 and 132:8.7:1, respectively. Mineralization of organic P in laboratory experiments was greater in flooded soils than in soils maintained at field capacity. Rates of mineralization were greater for manured than for non-manured samples. Organic and inorganic P moved at about equal rates in soil treated with manure extract. Rates of movement of both decreased with increasing sample depth in the feedlot soil. The feedlot soil below 30 cm and the field soils exhibited a high potential for inorganic and organic P fixation. Organic and inorganic P applied as manure extract moved faster than an equivalent concentration of P as KH2PO4.

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Spectral sensitivity of solution 31P NMR spectroscopy is improved by narrowing the soil to solution ratio to 1:4 for pasture soils of low organic P content

Geoderma ◽

10.1016/j.geoderma.2015.02.004 ◽

2015 ◽

Vol 257-258 ◽

pp. 48-57 ◽

Cited By ~ 11

Author(s):

Timothy I. McLaren ◽

Ronald J. Smernik ◽

Richard J. Simpson ◽

Michael J. McLaughlin ◽

Therese M. McBeath ◽

...

Keyword(s):

Nmr Spectroscopy ◽

Spectral Sensitivity ◽

31P Nmr ◽

31P Nmr Spectroscopy ◽

Organic P ◽

P Content ◽

Solution 31P Nmr Spectroscopy

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Density fractions versus size separates: does physical fractionation isolate functional soil compartments?

Biogeosciences Discussions ◽

10.5194/bgd-9-8405-2012 ◽

2012 ◽

Vol 9 (7) ◽

pp. 8405-8447 ◽

Cited By ~ 2

Author(s):

C. Moni ◽

D. Derrien ◽

P.-J. Hatton ◽

B. Zeller ◽

M. Kleber

Keyword(s):

Organic Matter ◽

European Beech ◽

Mineral Surfaces ◽

Density Fractionation ◽

Adsorbed State ◽

Density Fractions ◽

Physical Fractionation ◽

Comprehensive Picture ◽

Mineral Soils ◽

Decomposition Pathway

Abstract. Physical fractionation is a widely used methodology to study soil organic matter (SOM) dynamics, but concerns have been raised that the available fractionation methods do not well describe functional SOM pools. We also examine the question whether physical fractionation techniques isolate ecologically meaningful, functionally relevant soil compartments. In this study we explore whether the kind of information that aggregate density fractionation (ADF) and particle size-density fractionation (PSDF) yield on soil OM dynamics is method-specific, similar, or complimentary. We do so by following the incorporation of a 15N label into mineral soils of two European beech forests a decade after its application as 15N labelled litter. Both density and size-based fractionation methods suggested that OM became increasingly associated with the mineral phase as decomposition progressed, within aggregates and onto mineral surfaces. Our results suggest that physical fractionation methods do isolate ecologically relevant functional soil subunits. However, scientists investigating specific aspects of OM dynamics are pointed towards ADF when adsorption and aggregation processes are of interest, whereas PSDF is the superior tool to research the fate of particulate organic matter (POM). Some methodological caveats were observed mainly for the PSDF procedure, the most important one being that fine fractions isolated after sonication can not be linked to any defined decomposition pathway or stabilisation process. This also implies that historical assumptions about the "adsorbed" state of carbon associated with fine fractions need to be re-evaluated. Finally, this work demonstrates that establishing a comprehensive picture of whole soil OM dynamics requires a combination of both methodologies and we offer a suggestion for an efficient combination of the density and size-based approaches.

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Risk of phosphorus loss in surface runoff from agricultural land in the Baltic Commune of Puck

10.7287/peerj.preprints.27748v1 ◽

2019 ◽

Author(s):

Stefan Pietrzak ◽

Grażyna Pazikowska-Sapota ◽

Grażyna Dembska ◽

Lidia Anita Dzierzbicka-Glowacka ◽

Dominika Juszkowska ◽

...

Keyword(s):

Surface Runoff ◽

Agricultural Land ◽

Water Extract ◽

Soil Samples ◽

Water Soluble ◽

Organic Soils ◽

Distilled Water ◽

Degree Of P Saturation ◽

P Content ◽

Mineral Soils

Background. Risk assessment of Phosphorus (P) losses in surface runoff from agricultural land is the basic measure that should be used as a part of actions taken to counteract the water eutrophication in watercourses and water reservoirs. To assess this risk, a new method has been recently developed based on the determination of degree of P saturation (DPS) which depends on P content in soil determined with the use of distilled water (water-soluble P – WSP). Methods. Based on DPS method, the risk of P losses in surface runoff from agricultural land in Puck Commune (Baltic Sea Coast) was assessed and a critical analysis of assessment results was carried out. The research was conducted on mineral and organic soils from 50 and 11 separate agricultural plots with a total area of 133.82 and 37.23 ha, respectively. In collected soil samples, P content was determined using distilled water (all soil samples), Egner-Riehm method (mineral soils) and extract of 0.5 mol HCl ∙ dm-3 (organic soils). The results of determinations P content in water extract from soils were converted to DPS values, which were classified by appropriate limit intervals. Results & Discussion. It was found that on 96.7% of tested agricultural parcels (96% plots with mineral soils and 100% plots with organic soils) there was a potentially high risk of P losses from soil by surface runoff. At the same time, it was ascertained that in soils from 62% of agricultural plots, there was a large deficiency of plant available P. Due to the above, as well as due to the lack of connection with other factors affecting the P losses in surface runoff such as type of crop and area inclination, it was considered that the assessment based on the DPS index may be unreliable.

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Pasture degradation decreases organic P content of tropical soils due to soil structural decline

Geoderma ◽

10.1016/j.geoderma.2014.10.010 ◽

2015 ◽

Vol 257-258 ◽

pp. 123-133 ◽

Cited By ~ 24

Author(s):

Maike Nesper ◽

Else K. Bünemann ◽

Steven J. Fonte ◽

Idupulapati M. Rao ◽

Jaime E. Velásquez ◽

...

Keyword(s):

Tropical Soils ◽

Organic P ◽

P Content ◽

Pasture Degradation

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The priming effect of soluble carbon inputs in organic and mineral soils from a temperate forest

Oecologia ◽

10.1007/s00442-015-3290-x ◽

2015 ◽

Vol 178 (4) ◽

pp. 1239-1250 ◽

Cited By ~ 26

Author(s):

Hui Wang ◽

Wenhua Xu ◽

Guoqing Hu ◽

Weiwei Dai ◽

Ping Jiang ◽

...

Keyword(s):

Temperate Forest ◽

Priming Effect ◽

Mineral Soils ◽

Soluble Carbon

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Determination of total organic phosphorus in samples of mineral soils

Agricultural and Food Science ◽

10.23986/afsci.71582 ◽

1962 ◽

Vol 34 (1) ◽

pp. 187-196

Author(s):

Armi Kaila

Keyword(s):

Extraction Method ◽

Organic Phosphorus ◽

Simple Procedure ◽

Extraction Procedure ◽

Phosphorus Compounds ◽

Absolute Difference ◽

Partial Hydrolysis ◽

Organic P ◽

Mineral Soils

In this paper some observations on the estimation of organic phosphorus in mineral soils are reported. The fact is emphasized that the accuracy of all the methods available is relatively poor. Usually, there are no reasons to pay attention to differences less than about 20 ppm. of organic P. Analyses performed on 345 samples of Finnish mineral soils by the extraction method of MEHTA et. al. (10) and by a simple procedure adopted by the author (successive extractions with 4 N H2SO4 and 0.5 N NaOH at room temperature in the ratio of 1 to 100) gave, on the average, equal results. It seemed to be likely that the MEHTA method removed the organic phosphorus more completely than did the less vigorous method, but in the former the partial hydrolysis of organic phosphorus compounds tends to be higher than in the latter. An attempt was made to find out whether the differences between the respective values for organic phosphorus obtained by an ignition method and the simple extraction method could be connected with any characteristics of the soil. No correlation or only a low correlation coefficient could be calculated between the difference in the results of these two methods and e. g. the pH-value, the content of clay, organic carbon, aluminium and iron soluble in Tamm’s acid oxalate, the indicator of the phosphate sorption capacity, or the »Fe-bound» inorganic phosphorus, respectively. The absolute difference tended to increase with an increase in the content of organic phosphorus. For the 250 samples of surface soils analyzed, the ignition method gave values which were, on the average, about 50 ppm. higher than the results obtained by the extraction procedure. The corresponding difference for the 120 samples from deeper layers was about 20 ppm of organic P. The author recommends, for the present, the determination of the total soil organic phosphorus as an average of the results obtained by the ignition method and the extraction method.

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