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Conventional analysis methods underestimate the plant-available pools of calcium, magnesium and potassium in forest soils

Bel, Jérémie and Legout, Arnaud and Saint‑André, Laurent and Hall, Steven J. and Löfgren, Stefan and Laclau, Jean‑Paul and van der Heijden, Gregory (2020). Conventional analysis methods underestimate the plant-available pools of calcium, magnesium and potassium in forest soils. Scientific Reports. 10 , 15703
[Journal article]

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Abstract

The plant-available pools of calcium, magnesium and potassium are assumed to be stored in the soil
as exchangeable cations adsorbed on the cation exchange complex. In numerous forest ecosystems,
despite very low plant-available pools, elevated forest productivities are sustained. We hypothesize
that trees access nutrient sources in the soil that are currently unaccounted by conventional soil
analysis methods. We carried out an isotopic dilution assay to quantify the plant-available pools
of calcium, magnesium and potassium and trace the soil phases that support these pools in 143
individual soil samples covering 3 climatic zones and 5 different soil types. For 81%, 87% and 90%
of the soil samples (respectively for Ca, Mg and K), the plant-available pools measured by isotopic
dilution were greater than the conventional exchangeable pool. This additional pool is most likely
supported by secondary non-crystalline mineral phases in interaction with soil organic matter and
represents in many cases (respectively 43%, 27% and 47% of the soil samples) a substantial amount of
plant-available nutrient cations (50% greater than the conventional exchangeable pools) that is likely
to play an essential role in the biogeochemical functioning of forest ecosystems, in particular when the
resources of Ca, Mg and K are low.

Authors/Creators:Bel, Jérémie and Legout, Arnaud and Saint‑André, Laurent and Hall, Steven J. and Löfgren, Stefan and Laclau, Jean‑Paul and van der Heijden, Gregory
Title:Conventional analysis methods underestimate the plant-available pools of calcium, magnesium and potassium in forest soils
Year of publishing :2020
Volume:10
Article number:15703
Number of Pages:13
Associated Programs and Other Stakeholders:SLU - Environmental assessment > Programme Acidification
ISSN:2045-2322
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
URN:NBN:urn:nbn:se:slu:epsilon-p-108816
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108816
Additional ID:
Type of IDID
DOI10.1038/s41598-020-72741-w
ID Code:19137
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:09 Dec 2020 13:43
Metadata Last Modified:15 Jan 2021 19:17

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