Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Discussion papers
https://doi.org/10.5194/bg-2019-192
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2019-192
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 26 Aug 2019

Submitted as: research article | 26 Aug 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Biogeosciences (BG).

Estimates of mean residence times of phosphorus in commonly-considered inorganic soil phosphorus pools

Julian Helfenstein1,a,*, Chiara Pistocchi2,*, Astrid Oberson1, Federica Tamburini1, Daniel S. Goll3,b, and Emmanuel Frossard1 Julian Helfenstein et al.
  • 1Institute of Agricultural Sciences, ETH Zurich, Lindau 8315, Switzerland
  • 2Eco&Sols, Montpellier SupAgro, University of Montpellier, CIRAD, INRA, IRD, 34060 Montpellier, France
  • 3Le Laboratoire des Sciences du Climat et de l'Environnement, IPSL-LSCE CEA/CNRS/UVSQ Saclay, Gif-sur-Yvette, France
  • anow at: Agroscope, Zurich 8046, Switzerland
  • bnow at: Institute of Geography, University of Augsburg, Augsburg, Germany
  • *These authors contributed equally to this work.

Abstract. Quantification of turnover of inorganic soil phosphorus (P) pools is essential to improve our understanding of P cycling in soil-plant systems at different spatial scales. Turnover can be quantified using mean residence time (MRT), however, to date there is little information on MRT of P in soil P pools. We introduce an approach to quantify MRT of P in sequentially-extracted inorganic soil P pools using data from isotope exchange kinetic experiments. Our analyses of 53 soil samples from the literature showed that MRT of labile P (resin- and bicarbonate extractable P) was on the order of minutes to hours for most soils, MRT in NaOH-extractable P was in the range of days to months, and MRT in HCl-extractable P was on the order of years to millennia. Multiple regression models were able to capture 54–63 % of the variability in MRT among samples, and showed that land use was the most important predictor of MRT of P in labile and NaOH pools. MRT of P in HCl-P was strongly dependent on pH, as high pH soils tended to have longer MRTs. This was interpreted to be related to the composition of HCl-P. Under high pH, HCl-P contains mostly apatite, with a low solubility, whereas under low pH conditions, HCl-P may contain more exchangeable P forms. The estimates of MRT of P in inorganic pools improve our interpretation of soil P dynamics at the laboratory-, field- and ecosystem scale, and will also be useful to constrain P dynamics in global land surface models.

Julian Helfenstein et al.
Interactive discussion
Status: open (until 17 Oct 2019)
Status: open (until 17 Oct 2019)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement
Julian Helfenstein et al.
Julian Helfenstein et al.
Viewed  
Total article views: 248 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
192 53 3 248 10 0 1
  • HTML: 192
  • PDF: 53
  • XML: 3
  • Total: 248
  • Supplement: 10
  • BibTeX: 0
  • EndNote: 1
Views and downloads (calculated since 26 Aug 2019)
Cumulative views and downloads (calculated since 26 Aug 2019)
Viewed (geographical distribution)  
Total article views: 169 (including HTML, PDF, and XML) Thereof 169 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited  
Saved  
No saved metrics found.
Discussed  
No discussed metrics found.
Latest update: 19 Sep 2019
Publications Copernicus
Download
Short summary
In this article we provide estimates of mean residence times of phosphorus in inorganic soil phosphorus pools. These values improve our understanding of the dynamics of phosphorus cycling and can be used to improve global land surface models.
In this article we provide estimates of mean residence times of phosphorus in inorganic soil...
Citation