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Changes in organic phosphorus composition in boreal forest humus soils: the role of iron and aluminium
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Medicine, Department of Medical Biochemistry and Biophysics.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2012 (English)In: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515X, Vol. 108, no 1-3, 485-499 p.Article in journal (Refereed) Published
Abstract [en]

Organic phosphorus (P) is an important component of boreal forest humus soils, and its concentration has been found to be closely related to the concentration of iron (Fe) and aluminium (Al). We used solution and solid state 31P NMR spectroscopy on humus soils to characterize organic P along two groundwater recharge and discharge gradients in Fennoscandian boreal forest, which are also P sorption gradients due to differences in aluminium (Al) and iron (Fe) concentration in the humus. The composition of organic P changed sharply along the gradients. Phosphate diesters and their degradation products, as well as polyphosphates, were proportionally more abundant in low Al and Fe sites, whereas phosphate monoesters such as myo-, scyllo- and unknown inositol phosphates dominated in high Al and Fe soils. The concentration of inositol phosphates, but not that of diesters, was positively related to Al and Fe concentration in the humus soil. Overall, in high Al and Fe sites the composition of organic P seemed to be closely associated with stabilization processes, whereas in low Al and Fe sites it more closely reflected inputs of organic P, given the dominance of diesters which are generally assumed to constitute the bulk of organic P inputs to the soil. These gradients encompass the broad variation in soil properties detected in the wider Fennoscandian boreal forest landscape, as such our findings provide insight into the factors controlling P biogeochemistry in the region but should be of relevance to boreal forests elsewhere.

Place, publisher, year, edition, pages
Springer, 2012. Vol. 108, no 1-3, 485-499 p.
Keyword [en]
Solution 31P NMR spectroscopy, Solid state 31P NMR, Sorption, Groundwater discharge, Groundwater recharge, Betsele
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:umu:diva-44955DOI: 10.1007/s10533-011-9612-0ISI: 000300659300031OAI: oai:DiVA.org:umu-44955DiVA: diva2:423388
Available from: 2011-06-15 Created: 2011-06-15 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Analysis and speciation of organic phosphorus in environmental matrices: Development of methods to improve 31P NMR analysis
Open this publication in new window or tab >>Analysis and speciation of organic phosphorus in environmental matrices: Development of methods to improve 31P NMR analysis
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Phosphorus (P) is an essential element for life on our planet. It is central in numerous biochemical processes in terrestrial and aqueous ecosystems including food production; and it is the primary growth-limiting nutrient in some of the world’s biomes. The main source of P for use as agricultural fertilizer is mining of non-renewable mineral phosphate. In terrestrial ecosystems the main source is soil P, where the largest fraction is organic P, composed of many species with widely differing properties. This fraction controls the utilization of P by plants and microorganisms and influences ecosystem development and productivity. However, there is only scarce knowledge about the molecular composition of the organic P pool, about the processes controlling its bioavailability, and about its changes as soils develop. Therefore, the aim of this thesis was to develop robust solution- and solid-state 31P nuclear magnetic resonance spectroscopy (NMR) methods to provide molecular information about speciation of the organic P pool, and to study its dynamics in boreal and tropical soils. By studying humus soils of a groundwater recharge/discharge productivity gradient in a Fennoscandian boreal forest by solution- and solid-state NMR, it was found that P speciation changed with productivity. In particular, the level of orthophosphate diesters decreased with increasing productivity while mono-esters such as inositol phosphates increased. Because the use of solution NMR on conventional NaOH/EDTA extracts of soils was limited due to severe line broadening caused by the presence of paramagnetic metal ions, a new extraction method was developed and validated. Based on the removal of these paramagnetic impurities by sulfide precipitation, a dramatic decrease in NMR linewidths was obtained, allowing for the first time to apply modern multi-dimensional solution NMR techniques to soil extracts. Identification of individual soil P-species, and tracking changes in the organic P pools during soil development provided information for connecting P-speciation to bioavailability and ecosystem properties. Using this NMR approach we studied the transformation of organic P in humus soils along a chronosequence (7800 years) in Northern Sweden. While total P varied little, the composition of the soil P pool changed particularly among young sites, where also the largest shift in the composition of the plant community and of soil microorganisms was observed. Very old soils, such as found Africa, are thought to strongly adsorb P, limiting plant productivity. I used NMR to study the effect of scattered agroforestry trees on P speciation in two semi-arid tropical woodlands with different soil mineralogy (Burkina Faso). While the total P concentration was low, under the tree canopies higher amounts of P and higher diversity of P-species were found, presumably reflecting higher microbial activity.

Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2014. 58 p.
Keyword
Phosphorus, soil, 31P NMR, NaOH/EDTA, terrestrial, sulfide, speciation, bioavailability, paramagnetic, humus, boreal, tropical, multi-dimensional, agroforestry, chronosequence
National Category
Physical Chemistry
Research subject
Physical Chemistry
Identifiers
urn:nbn:se:umu:diva-93409 (URN)978-91-7601-132-4 (ISBN)
Public defence
2014-10-17, KBC-huset, Stora hörsalen, KB3B1, KBC huset, s-90187, Umeå, 10:00 (English)
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Supervisors
Note

I delarbete III har titel och författaruppgifter förändrats.

Available from: 2014-09-26 Created: 2014-09-19 Last updated: 2014-09-24Bibliographically approved

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Vincent, Andrea GSchleucher, JürgenGröbner, GerhardVestergren, JohanPersson, PerJansson, MatsGiesler, Reiner
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Department of Ecology and Environmental SciencesDepartment of Medical Biochemistry and BiophysicsDepartment of Chemistry
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