Preprints
https://doi.org/10.5194/essd-2021-166
https://doi.org/10.5194/essd-2021-166

  12 Jul 2021

12 Jul 2021

Review status: this preprint is currently under review for the journal ESSD.

Global patterns and drivers of soil total phosphorus concentration

Xianjin He1, Laurent Augusto2, Daniel S. Goll3, Bruno Ringeval2, Yingping Wang4,5, Julian Helfenstein6, Yuanyuan Huang3,5, Kailiang Yu7, Zhiqiang Wang8, Yongchuan Yang1, and Enqing Hou4 Xianjin He et al.
  • 1Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
  • 2INRAE, Bordeaux Sciences Agro, UMR 1391 ISPA, 33140 Villenave d’Ornon, France
  • 3Université Paris Saclay, CEA-CNRS-UVSQ, LSCE/IPSL, Gif sur Yvette, France
  • 4Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
  • 5CSIRO Oceans and Atmosphere, Aspendale, Vic., Australia
  • 6Agroscope, 8046 Zürich, Switzerland
  • 7High Meadows Environmental Institute, Princeton University, Princeton, NJ 08544, USA
  • 8Institute for Advanced Study, Chengdu University, Chengdu, Sichuan, China

Abstract. Soils represent the largest phosphorus (P) reserves on land and determining the amount is a critical first step for identifying sites where ecosystem functioning is potentially limited by P availability. However, global patterns and predictors of soil total P concentration remain poorly understood. To address this knowledge gap, we constructed a database of the total P concentration of 5,275 distributed globally natural soils. We quantified the relative importance of 13 soil-forming variables in predicting soil total P concentration and then made further predictions at the global scale using a random forest approach. Soil total P concentration varied significantly among parent material types, soil orders, biomes, and continents, and ranged widely from 1.4 to 9,630.0 (median 430.0 and mean 570.0) mg kg−1 across the globe. About two-thirds (65 %) of the global variation was accounted for by the 13 variables that we selected, among which soil organic carbon concentration, parent material, mean annual temperature, and soil sand content were the most important. While global predictions of soil total P concentration increased significantly with latitude, they varied largely among regions with similar latitudes due to regional differences in parent material, topography, and/or climate conditions. Global soil P stocks (excluding Antarctica) were estimated to be 26.8 ± 3.1 (mean ± standard deviation) Pg and 62.2 ± 8.9 Pg (1 Pg = 1 × 1015 g) in the topsoil (0–30 cm) and subsoil (30–100 cm), respectively. Our global map of soil total P concentration as well as the underlying drivers of soil total P concentration can be used to constraint Earth system models that represent the P cycle and to inform quantification of global soil P availability. Raw datasets and global maps generated in this study are available at https://doi.org/10.6084/m9.figshare.14583375 (He et al., 2021).

Xianjin He et al.

Status: open (until 06 Sep 2021)

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Xianjin He et al.

Data sets

Global patterns and drivers of soil total phosphorus concentration Xianjin He; Laurent Augusto; Daniel S. Goll; Bruno Ringeval; Yingping Wang; Julian Helfenstein; Yuanyuan Huang; Kailiang Yu; Zhiqiang Wang; Yongchuan Yang; Enqing Hou https://doi.org/10.6084/m9.figshare.14583375

Model code and software

Global patterns and drivers of soil total phosphorus concentration Xianjin He; Laurent Augusto; Daniel S. Goll; Bruno Ringeval; Yingping Wang; Julian Helfenstein; Yuanyuan Huang; Kailiang Yu; Zhiqiang Wang; Yongchuan Yang; Enqing Hou https://doi.org/10.6084/m9.figshare.14583375

Xianjin He et al.

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Short summary
Our database of globally distributed natural soil total P concentration (STP) showed STP ranged from 1.4 to 9,630.0 (mean 570.0) mg kg−1. Global predictions of STP concentration increased with latitude. Global STP stocks (excluding Antarctica) were estimated to be 26.8 and 62.2 Pg in the topsoil and subsoil, respectively. Our global map of STP concentration can be used to constraint Earth system models that represent the P cycle and to inform quantification of global soil P availability.