Spruce forest afforestation leading to increased Fe mobilization from soils

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Škerlep, MartinLund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Akvatisk ekologi,Forskargrupper vid Lunds universitet,Centre for Environmental and Climate Science (CEC),Faculty of Science,Aquatic Ecology,Lund University Research Groups (author)

Spruce forest afforestation leading to increased Fe mobilization from soils

Article/chapterEnglish2022

Publisher, publication year, extent ...

2021-12-01
Springer Science and Business Media LLC,2022

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LIBRIS-ID:oai:lup.lub.lu.se:eb311419-022d-4c7d-8ca7-94b487bff4a9
https://lup.lub.lu.se/record/eb311419-022d-4c7d-8ca7-94b487bff4a9URI
https://doi.org/10.1007/s10533-021-00874-9DOI
https://res.slu.se/id/publ/114697URI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:art swepub-publicationtype
Subject category:ref swepub-contenttype

Notes

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.

Subject headings and genre

LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Markvetenskap hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Soil Science hsv//eng
LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Skogsvetenskap hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Forest Science hsv//eng
Afforestation
Browning
DOC
Iron
Norway spruce
Soil biogeochemistry

Added entries (persons, corporate bodies, meetings, titles ...)

Nehzati, SusanLund University,Lunds universitet,MAX IV-laboratoriet,Biologiska institutionen,Naturvetenskapliga fakulteten,MAX IV Laboratory,Department of Biology,Faculty of Science(Swepub:lu)su7285ne (author)
Johansson, UlfSveriges lantbruksuniversitet,Swedish University of Agricultural Sciences,Enheten för skoglig fältforskning,Unit for Field-based Forest Research(Swepub:slu)47360 (author)
Berggren Kleja, DanSveriges lantbruksuniversitet,Swedish University of Agricultural Sciences,Institutionen för mark och miljö,Department of Soil and Environment(Swepub:slu)49721 (author)
Persson, PerLund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Centre for Environmental and Climate Science (CEC),Faculty of Science(Swepub:lu)cec-ppn (author)
Kritzberg, Emma S.Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Akvatisk ekologi,Forskargrupper vid Lunds universitet,Centre for Environmental and Climate Science (CEC),Faculty of Science,Aquatic Ecology,Lund University Research Groups(Swepub:lu)lim-ekr (author)
BECC: Biodiversity and Ecosystem services in a Changing ClimateCentrum för miljö- och klimatvetenskap (CEC) (creator_code:org_t)
Sveriges lantbruksuniversitet

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In:Biogeochemistry: Springer Science and Business Media LLC157:3, s. 273-2900168-25631573-515X

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