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Soil organic phosphorus transformations in a boreal forest chronosequence
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen. Centre for Environmental and Climate Research, Lund University, Lund, Sweden.
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2013 (Engelska)Ingår i: Plant and Soil, ISSN 0032-079X, E-ISSN 1573-5036, Vol. 367, nr 1-2, s. 149-162Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Background and Aims Soil phosphorus (P) composition changes with ecosystem development, leading to changes in P bioavailability and ecosystem properties. Little is known, however, about how soil P transformations proceed with ecosystem development in boreal regions.

Methods We used 1-dimensional 31P and 2-dimensional 1H, 31P correlation nuclear magnetic resonance (NMR) spectroscopy to characterise soil organic P transformations in humus horizons across a 7,800 year-old chronosequence in Västerbotten, northern Sweden.

Results Total soil P concentration varied little along the chronosequence, but P compounds followed three trends. Firstly, the concentrations of DNA, 2-aminoethyl phosphonic acid, and polyphosphate, increased up to 1,200–2,700 years and then declined. Secondly, the abundances of α– and β—glycerophosphate, nucleotides, and pyrophosphate, were higher at the youngest site compared with all other sites. Lastly, concentrations of inositol hexakisphosphate fluctuated with site age. The largest changes in soil P composition tended to occur in young sites which also experience the largest shifts in plant community composition.

Conclusions The apparent lack of change in total soil P is consistent with the youth and nitrogen limited nature of the Västerbotten chronosequence. Based on 2D NMR spectra, around 40 % of extractable soil organic P appeared to occur in live microbial cells. The observed trends in soil organic P may be related to shifts in plant community composition (and associated changes in soil microorganisms) along the studied chronosequence, but further studies are needed to confirm this.

Ort, förlag, år, upplaga, sidor
Dordrecht: Springer, 2013. Vol. 367, nr 1-2, s. 149-162
Nyckelord [en]
Podzolization, 1D 31P NMR, 2D 1H, 31P correlation NMR, Inositol hexakisphosphate, Ribonucleic acid (RNA), Västerbotten chronosequence
Nationell ämneskategori
Kemi
Identifikatorer
URN: urn:nbn:se:umu:diva-71214DOI: 10.1007/s11104-013-1731-zISI: 000319771700010OAI: oai:DiVA.org:umu-71214DiVA, id: diva2:622768
Tillgänglig från: 2013-05-23 Skapad: 2013-05-23 Senast uppdaterad: 2018-06-08Bibliografiskt granskad
Ingår i avhandling
1. Analysis and speciation of organic phosphorus in environmental matrices: Development of methods to improve 31P NMR analysis
Öppna denna publikation i ny flik eller fönster >>Analysis and speciation of organic phosphorus in environmental matrices: Development of methods to improve 31P NMR analysis
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå Universitet, 2014. s. 58
Nyckelord
Phosphorus, soil, 31P NMR, NaOH/EDTA, terrestrial, sulfide, speciation, bioavailability, paramagnetic, humus, boreal, tropical, multi-dimensional, agroforestry, chronosequence
Nationell ämneskategori
Fysikalisk kemi
Forskningsämne
fysikalisk kemi
Identifikatorer
urn:nbn:se:umu:diva-93409 (URN)978-91-7601-132-4 (ISBN)
Disputation
2014-10-17, KBC-huset, Stora hörsalen, KB3B1, KBC huset, s-90187, Umeå, 10:00 (Engelska)
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I delarbete III har titel och författaruppgifter förändrats.

Tillgänglig från: 2014-09-26 Skapad: 2014-09-19 Senast uppdaterad: 2018-06-07Bibliografiskt granskad

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Vincent, Andrea G.Vestergren, JohanGröbner, GerhardPersson, PerSchleucher, JürgenGiesler, Reiner

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Vincent, Andrea G.Vestergren, JohanGröbner, GerhardPersson, PerSchleucher, JürgenGiesler, Reiner
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Institutionen för ekologi, miljö och geovetenskapKemiska institutionenInstitutionen för medicinsk kemi och biofysik
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