Tracing sources and cycling of phosphorus in Peru Margin sediments using oxygen isotopes in authigenic and detrital phosphates

Jaisi, Deb P.; Blake, Ruth E.

doi:10.1016/j.gca.2010.02.030

Cited by 90 publications

(49 citation statements)

References 61 publications

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“…For the isolation of phosphates we followed the method protocols of Tamburini et al () and Jaisi & Blake (). We combined both methods because that of Tamburini et al () works well for soil, but the recovery of P has not yet been reported, whereas the method of Jaisi & Blake () was developed originally for sediments and has not yet been optimized for soil. Furthermore, some modifications were necessary to obtain pure Ag 3 PO 4 crystals.…”

Section: Methodsmentioning

confidence: 99%

“…As an additional check on the accuracy of the extraction protocol, we monitored oxygen contamination by ensuring the correct oxygen content of Ag 3 PO 4 during isotope ratio measurement. The reliability of isotope recovery for the different stages in the analytical process had been established previously by Jaisi & Blake (). The analytical precision of the IRMS measurements was approximately 0.2 delta units; replicate analyses of the same samples indicated an average precision of 0.72 delta units for the whole procedure.…”

Section: Methodsmentioning

confidence: 99%

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The δ¹⁸O signatures of HCl‐extractable soil phosphates: methodological challenges and evidence of the cycling of biological P in arable soil

Amelung

Antar

Kleeberg

et al. 2015

European J Soil Science

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SummarySoil phosphates exchange oxygen atoms rapidly with soil water once recycled by intracellular enzymes, thereby approaching an equilibrium 18 O P signature that depends on ambient temperature and the 18 O W signature of soil water. We hypothesized that in the topsoil, phosphates reach this equilibrium 18 O P signature even if amended by different fertilizers. In the subsoil, however, there might be phosphates with a smaller 18 O P value than that represented by the isotopic equilibrium value, a condition that could exist in the case of limited biological P cycling only. We tested these hypotheses for the HCl-extractable P pool of the Hedley fractionation scheme of arable soil in Germany, which integrates over extended time-scales of the soil P cycle. We sampled several types of fertilizer, the surface soil that received these fertilizer types and composites from a Haplic Luvisol depth profile under long-term agricultural practice. Organic fertilizers had significantly smaller 18 O P values than mineral fertilizers. Intriguingly, the fields fertilized organically also tended to have smaller 18 O P signatures than other types of surface soil, which calls into question full isotopic equilibrium at all sites. At depths below 50 cm, the soil 18 O P values were even depleted relative to the values calculated for isotopic equilibrium. This implies that HCl-extractable phosphates in different soil horizons are of different origins. In addition, it supports the assumption that biological cycling of P by intracellular microbial enzymes might have been relatively inefficient in the deeper subsoil. At depths of 50-80 cm, there was a transition zone of declining 18 O P values, which might be regarded as the first evidence that the degree of biological P cycling changed at this depth interval.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The δ¹⁸O signatures of HCl‐extractable soil phosphates: methodological challenges and evidence of the cycling of biological P in arable soil

Amelung

Antar

Kleeberg

et al. 2015

European J Soil Science

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“…Carbon ( 12 C/ 13 C), nitrogen ( 14 N/ 15 N), oxygen ( 16 O/ 18 O), sulfur ( 32 S/ 34 S) and hydrogen ( 1 H/ 2 H) all have stable isotopes that have, or could be used in studying P dynamics. For example, changes in 18 O to 16 O ratios in phosphate have been used to determine the source of P to sediments [139] and to differentiate between biotic and abiotic cycling of P. [140] Although those studies focussed on phosphate, similar approaches could be applied to organic P.…”

Section: Expansion Of the Types Of Ecosystems Studiedmentioning

confidence: 99%

Organic phosphorus in the aquatic environment

Baldwin¹

2013

Environ. Chem.

104

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Environmental context. Organic phosphorus can be one of the major fractions of phosphorus in many aquatic ecosystems. This paper discusses the distribution, cycling and ecological significance of five major classes of organic P in the aquatic environment and discusses several principles to guide organic P research into the future.Abstract. Organic phosphorus can be one of the major fractions of phosphorus in many aquatic ecosystems. Unfortunately, in many studies the 'organic' P fraction is operationally defined. However, there are an increasing number of studies where the organic P species have been structurally characterised -in part because of the adoption of 31 P NMR spectroscopic techniques. There are five classes of organic P species that have been specifically identified in the aquatic environment -nucleic acids, other nucleotides, inositol phosphates, phospholipids and phosphonates. This paper explores the identification, quantification, biogeochemical cycling and ecological significance of these organic P compounds. Based on this analysis, the paper then identifies a number of principles which could guide the research of organic P into the future. There is an ongoing need to develop methods for quickly and accurately identifying and quantifying organic P species in the environment. The types of ecosystems in which organic P dynamics are studied needs to be expanded; flowing waters, floodplains and small wetlands are currently all under-represented in the literature. While enzymatic hydrolysis is an important transformation pathway for the breakdown of organic P, more effort needs to be directed towards studying other potential transformation pathways. Similarly effort should be directed to estimating the rates of transformations, not simply reporting on the concentrations. And finally, further work is needed in elucidating other roles of organic P in the environment other than simply a source of P to aquatic organisms.

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“…Oxygen isotopes are indicative of temperature but also, in some cases, of the origin of the pore fluid (e.g. Meister et al ., ; Jaisi and Blake, ). Several radiogenic or non‐traditional stable isotope systems are now available that may provide further information about the geochemical conditions and the process of diagenetic mineral precipitation, such as 87 Sr/ 86 Sr for the origin of fluids (Meister et al ., ; Meister et al ., , Wehrmann et al ., in press), Ca and Mg isotopes for open vs. closed system conditions and precipitation kinetics (Mavromatis et al ., , ) or boron isotopes as an indicator of pH (Kasemann et al ., ).…”

Section: Diagenetic Mineral Imprintsmentioning

confidence: 99%

For the deep biosphere, the present is not always the key to the past: what we can learn from the geological record

Meister

2015

Terra Nova

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Microbial life below the Earth's surface (the deep biosphere) has probably varied significantly since the Archaean. Reconstructing changes in deep biosphere activity over geological timescales is necessary to understand its role in biogeochemical cycling. Even for the last few million years, such changes are often not captured by studying the distribution of present activity. However, several studies using samples from scientific drilling have revealed mineralogical, geochemical, isotopic and fossil organic molecule imprints in the sedimentary record that document rather different past deep biosphere conditions.Changing deep biosphere conditions can also be simulated using geochemical models. While some processes occurring in the past can be understood by comparing them with the present deep biosphere, others lack any modern analogue -they are defined as non-actualistic. A non-actualistic consideration of the deep biosphere is therefore essential for a better understanding of how Earth and life co-evolved through time.

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Tracing sources and cycling of phosphorus in Peru Margin sediments using oxygen isotopes in authigenic and detrital phosphates

Cited by 90 publications

References 61 publications

The δ¹⁸O signatures of HCl‐extractable soil phosphates: methodological challenges and evidence of the cycling of biological P in arable soil

The δ¹⁸O signatures of HCl‐extractable soil phosphates: methodological challenges and evidence of the cycling of biological P in arable soil

Organic phosphorus in the aquatic environment

For the deep biosphere, the present is not always the key to the past: what we can learn from the geological record

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Tracing sources and cycling of phosphorus in Peru Margin sediments using oxygen isotopes in authigenic and detrital phosphates

Cited by 90 publications

References 61 publications

The δ18O signatures of HCl‐extractable soil phosphates: methodological challenges and evidence of the cycling of biological P in arable soil

The δ18O signatures of HCl‐extractable soil phosphates: methodological challenges and evidence of the cycling of biological P in arable soil

Organic phosphorus in the aquatic environment

For the deep biosphere, the present is not always the key to the past: what we can learn from the geological record

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Product

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The δ¹⁸O signatures of HCl‐extractable soil phosphates: methodological challenges and evidence of the cycling of biological P in arable soil

The δ¹⁸O signatures of HCl‐extractable soil phosphates: methodological challenges and evidence of the cycling of biological P in arable soil