Dynamics of Organic Phosphorus in Soils under Natural and Agricultural Ecosystems

Magid, Jakob; Tiessen, H.; Condron, Leo M.

doi:10.1016/b978-044481516-3/50012-8

Cited by 147 publications

(115 citation statements)

References 119 publications

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“…This soil was an outlier in the relationship between monoester concentration and soil P status (Figure 4). Phosphate monoesters dominated organic P, as is typical of agricultural grassland soils (Condron et al, 1985;Magid et al, 1996;Koopmans et al, 2003). Phosphate monoesters were the dominant P species in NaOH-EDTA extracts of basaltic soils (51% monoester), unlike the non-basaltic soils in this study (41% monoester) and grassland soils of New Zealand (38% monoester) (McDowell et al, 2005).…”

Section: Phosphorus Speciation and Soil Propertiesmentioning

confidence: 55%

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Phosphorus speciation in temperate basaltic grassland soils by solution ³¹P NMR spectroscopy

Murphy

Bell

Turner

2009

European J Soil Science

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SummaryPhosphorus (P) speciation in 21 basaltic and four non-basaltic Irish grassland soils was determined by NaOH-EDTA extraction and 31 P NMR spectroscopy. Organic P in basaltic soils ranged between 30and 697 mg P kg À1 and consisted of phosphate monoesters (84-100%), DNA (0-16%) and phosphonates (0-5%). Inorganic P was mainly phosphate (83-100%) with small concentrations of pyrophosphate (0-17%). Phosphate monoesters were more important as a proportion of extracted P in basaltic soils, probably because of their greater oxalate-extractable Fe and Al contents. Phosphate monoesters appeared to be strongly associated with non-crystalline Al and increased with total soil P concentration, indicating that they do accumulate in grassland soils. In non-basaltic soils myo-inositol hexakisphosphate constituted between 20 and 52% of organic P, while scyllo-inositol hexakisphosphate constituted between 12 and 17%. These compounds were not quantified separately in basaltic soils because of poor NMR resolution in the phosphate monoester region, but appeared to represent a considerable proportion of the organic P in most samples. DNA concentrations were greater in basaltic soils compared with non-basaltic soils and were associated with acidic pH and large total C contents. The inability of the Olsen P test to assess effectively the P status of basaltic soils may result from strong phosphate sorption to Fe and Al oxides, inducing plant utilization of soil organic P. Phosphorus nutrient management should account for this to avoid over-application of P and associated financial and environmental costs.

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Section: Phosphorus Speciation and Soil Propertiesmentioning

confidence: 55%

“…Inositol phosphates are important in soil organisms and plants (Magid et al, 1996) and in soil solution and leachate (Evans, 1985;Espinosa et al, 1999). A large proportion of the organic P in the non-basaltic soils was in the form of inositol hexakisphosphate.…”

Section: Phosphorus Speciation and Soil Propertiesmentioning

confidence: 99%

Phosphorus speciation in temperate basaltic grassland soils by solution ³¹P NMR spectroscopy

Murphy

Bell

Turner

2009

European J Soil Science

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“…Rheinheimer et al (2000) obtiveram, para um Latossolo Vermelho distroférrico típico, similar ao do presente estudo, valores de P-BM de até 19 % do Po total. Esse valor é considerado alto, pois, de acordo com Magid et al (1996), os teores médios encontrados na literatura são de 2 a 5 %, apesar de já terem sido encontrados teores de até 20 % do Po total (Qualls & Richardson, 1995).…”

Section: Resultsunclassified

Biomassa microbiana do solo em sistema de integração lavoura-pecuária em plantio direto, submetido a intensidades de pastejo

Souza

Costa

Anghinoni

et al. 2010

Rev. Bras. Ciênc. Solo

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RESUMOEm sistemas de integração lavoura-pecuária, boa parte do suprimento de nutrientes para as pastagens provém das excreções dos animais, na forma de esterco e de urina, o que resulta em estímulo à atividade e ao acúmulo de nutrientes nas suas células. Este estudo foi desenvolvido num experimento de integração lavourapecuária em plantio direto, iniciado em 2001, e objetivou avaliar o impacto de diferentes intensidades de pastejo da pastagem de inverno (aveia-preta + azevém; 10, 20 e 40 cm, e um tratamento sem pastejo) sobre a atividade microbiana e sobre os teores e estoques de C, N e P na biomassa microbiana na camada de 0-10 cm de um Latossolo Vermelho, no Sul do Brasil, durante o ciclo da pastagem. Os teores e estoques dos nutrientes na biomassa e a atividade microbiana foram alterados pela intensidade de pastejo e pela época no ciclo da pastagem. Os teores de C e de P microbiano aumentaram do início da pastagem, em maio, até o período de grande produção de fitomassa, em setembro, após o qual decresceram, acompanhando o início de senescência da pastagem. Por sua vez, o N microbiano decresceu de maio para novembro, possivelmente devido à absorção desse nutriente pelas plantas. Sistemas de integração lavoura-pecuária em plantio direto mantêm a qualidade

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“…These compounds show different stabilization degree and they are totally derived from microorganisms (Magid et al, 1996). Thus, the chemical nature and dynamics of organic P in soils are determined by microbial products.…”

Section: Mineralization Of the Doc And Nutrient Supplymentioning

confidence: 99%

Dissolved organic carbon and bioavailability of N and P as indicators of soil quality

Silveira

2005

Sci. agric. (Piracicaba, Braz.)

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Soil quality has become an important issue in soil science. Considerable attempts have been made to define soil quality, but a general concept has not yet been accepted by the scientific community. The selection of quantitative indices for soil quality is extremely difficult, and a considerable number of chemical, physical, and biochemical properties have been suggested as potential indicators of soil quality. Because soil organic matter (SOM) can be associated with different soil chemical, physical and biological processes, it has been widely considered as one of the best soil quality indicator. Land use can significantly influence dynamics of organic carbon and N, P, and S cycle. However, changes in total soil organic carbon (SOC) contents in response to land use may be difficult to detect because of the natural soil variability. In the short to medium term, biological properties and readily decomposable fractions of SOC, such as dissolved organic carbon (DOC), are much more sensitive to soil management than is SOM as a whole, and can be used as a key indicator of soil natural functions. Despite the fact that labile C accounts for a small portion of the total organic matter in the soils, DOC is the most mobile and important C-source for microorganisms, and can easily reflect the effects of land use on soil quality. Although several methods are used to characterize DOC, the factors influencing mineralization and bioavailability of elements associated with organic matter (N, P, and S) remains unclear. Future research should focus on the processes that govern DOC and nutrient dynamics and how they affect soil quality.

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Dynamics of Organic Phosphorus in Soils under Natural and Agricultural Ecosystems

Cited by 147 publications

References 119 publications

Phosphorus speciation in temperate basaltic grassland soils by solution ³¹P NMR spectroscopy

Phosphorus speciation in temperate basaltic grassland soils by solution ³¹P NMR spectroscopy

Biomassa microbiana do solo em sistema de integração lavoura-pecuária em plantio direto, submetido a intensidades de pastejo

Dissolved organic carbon and bioavailability of N and P as indicators of soil quality

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Dynamics of Organic Phosphorus in Soils under Natural and Agricultural Ecosystems

Cited by 147 publications

References 119 publications

Phosphorus speciation in temperate basaltic grassland soils by solution 31P NMR spectroscopy

Phosphorus speciation in temperate basaltic grassland soils by solution 31P NMR spectroscopy

Biomassa microbiana do solo em sistema de integração lavoura-pecuária em plantio direto, submetido a intensidades de pastejo

Dissolved organic carbon and bioavailability of N and P as indicators of soil quality

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Phosphorus speciation in temperate basaltic grassland soils by solution ³¹P NMR spectroscopy

Phosphorus speciation in temperate basaltic grassland soils by solution ³¹P NMR spectroscopy