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Spruce forest afforestation leading to increased Fe mobilization from soils

Skerlep, Martin and Nehzati, Susan and Johansson, Ulf and Berggren Kleja, Dan and Persson, Per and Kritzberg, Emma S. (2022). Spruce forest afforestation leading to increased Fe mobilization from soils. Biogeochemistry. 157 :3 , 273-290
[Research article]

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Abstract

Increasing exports of Fe and DOC from soils, causing browning of freshwaters, have been reported in recent decades in many regions of the northern hemisphere. Afforestation, and in particular an increase of Norway spruce forest in certain regions, is suggested as a driver behind these trends in water chemistry. In this study, we tested the hypothesis that the gradual accumulation of organic soil layers in spruce forests, and subsequent increase in organic acid concentrations and acidity enhances mobilization of Fe. First generation Norway spruce stands of different ages (35, 61, 90 years) and adjacent arable control plots were selected to represent the effects of aging forest. Soil solutions were sampled from suction lysimeters at two depths (below organic soil layer and in mineral soil) during two years, and analyzed for Fe concentration, Fe speciation (XAS analysis), DOC, metals, major anions and cations. Solution Fe concentrations were significantly higher in shallow soils under older spruce stands (by 5- and 6-fold) than in control plots and the youngest forest. Variation in Fe concentration was best explained by variation in DOC concentration and pH. Moreover, Fe in all soil solutions was present as mononuclear Fe(III)-OM complexes, showing that this phase is dominating Fe translocation. Fe speciation in the soil was also analyzed, and found to be dominated by Fe oxides with minor differences between plots. These results confirmed that Fe mobilization, by Fe(III)-OM complexes, was higher from mature spruce stands, which supports that afforestation with spruce may contribute to rising concentrations of Fe in surface waters.

Authors/Creators:Skerlep, Martin and Nehzati, Susan and Johansson, Ulf and Berggren Kleja, Dan and Persson, Per and Kritzberg, Emma S.
Title:Spruce forest afforestation leading to increased Fe mobilization from soils
Series Name/Journal:Biogeochemistry
Year of publishing :2022
Volume:157
Number:3
Page range:273-290
Number of Pages:18
Publisher:SPRINGER
ISSN:0168-2563
Language:English
Publication Type:Research 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 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:Iron, DOC, Soil biogeochemistry, Browning, Norway spruce, Afforestation
URN:NBN:urn:nbn:se:slu:epsilon-p-114697
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114697
Additional ID:
Type of IDID
DOI10.1007/s10533-021-00874-9
Web of Science (WoS)000724643100001
ID Code:27085
Faculty:S - Faculty of Forest Sciences
NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(S) > Unit for Field-based Forest Research
(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:14 Feb 2022 12:25
Metadata Last Modified:14 Feb 2022 12:31

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