Global patterns and drivers of soil total phosphorus concentration
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Published:2021-12-20
Issue:12
Volume:13
Page:5831-5846
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ISSN:1866-3516
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Container-title:Earth System Science Data
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language:en
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Short-container-title:Earth Syst. Sci. Data
Author:
He Xianjin, Augusto Laurent, Goll Daniel S.ORCID, Ringeval BrunoORCID, Wang YingpingORCID, Helfenstein JulianORCID, Huang YuanyuanORCID, Yu Kailiang, Wang Zhiqiang, Yang Yongchuan, Hou Enqing
Abstract
Abstract. Soil represents the largest phosphorus (P) stock in terrestrial
ecosystems. Determining the amount of soil P is a critical first step in
identifying sites where ecosystem functioning is potentially limited by soil
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 total P concentration of 5275 globally
distributed (semi-)natural soils from 761 published studies. 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 9630.0 (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 ones. While
predicted soil total P concentrations increased significantly with latitude,
they varied largely among regions with similar latitudes due to regional
differences in parent material, topography, and/or climate conditions. 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).
Funder
National Natural Science Foundation of China China Postdoctoral Science Foundation
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
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