Soil phosphorus forms show only minor changes across a 5000-year-old boreal wildfire chronosequence

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Vincent, AndreaSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management (author)

Soil phosphorus forms show only minor changes across a 5000-year-old boreal wildfire chronosequence

Article/chapterEnglish2022

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2022-02-27
Springer,2022
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LIBRIS-ID:oai:DiVA.org:umu-192955
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-192955URI
https://doi.org/10.1007/s10533-022-00910-2DOI
https://res.slu.se/id/publ/116596URI

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Language:English
Summary in:English

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

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Wildfire is the main disturbance in most boreal forests. In the prolonged absence of wildfire, ecosystem retrogression occurs, which is characterized by reduced productivity, plant biomass and belowground process rates. Previous evidence suggests that phosphorus (P) decreases during retrogression, but the mechanisms involved remain poorly understood. Here we use 1-D 31P and 2-D, 1H-31P NMR to characterize changes in humus P composition across a 5000 year post-fire chronosequence in northern Sweden, to understand why P availability declines during long term fire absence. Against expectations, humus P composition varied only modestly with increasing time since fire. Using a method to back-calculate the in situ soil organic P speciation, we found that it was dominated by biologically active compounds such as RNA (41%), phospholipids (28%) and DNA (22%). The concentration of DNA and pyrophosphate was 19% and 29% lower, respectively, on infrequently burnt than recently burnt islands, and the concentration of DNA, phospholipids and nucleotides was positively correlated with net primary productivity (NPP). Given the lack of evidence for the accumulation of “recalcitrant” P or a geochemical P sink, reductions in P availability during retrogression may be associated with impaired P cycling through slower decomposition rates, and increasing humus depth separating surface humus from P-rich mineral soil. Our findings align with observed negative relationships between NPP and organic P concentration across other chronosequences. They also suggest that changing fire regimes in the boreal zone could indirectly affect the P cycle through changes in NPP and soil microflora rather than through changes in humus P composition.

Subject headings and genre

LANTBRUKSVETENSKAPER Annan lantbruksvetenskap Miljö- och naturvårdsvetenskap hsv//swe
AGRICULTURAL SCIENCES Other Agricultural Sciences Environmental Sciences related to Agriculture and Land-use hsv//eng
LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Markvetenskap hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Soil Science hsv//eng
Anthropogenic fire suppression
Arjeplog
Ecosystem retrogression
Fennoscandia
One-dimensional 31P NMR
Two-dimensional 1H
31P NMR

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Schleucher, Jürgen,ProfessorUmeå universitet,Institutionen för medicinsk kemi och biofysik(Swepub:umu)jusc0001 (author)
Giesler, ReinerUmeå universitet,Institutionen för ekologi, miljö och geovetenskap(Swepub:umu)regi0001 (author)
Wardle, DavidSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,Nanyang Technological University (NTU)(Swepub:slu)49465 (author)
Sveriges lantbruksuniversitetInstitutionen för skogens ekologi och skötsel (creator_code:org_t)
Sveriges lantbruksuniversitet

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In:Biogeochemistry: Springer159, s. 15-320168-25631573-515X

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By the author/editor: Vincent, Andrea; Schleucher, Jürg ...; Giesler, Reiner; Wardle, David

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AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Other Agricultur ...; and Environmental Sc ...

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Soil Science

Articles in the publication: Biogeochemistry

By the university: Umeå University; Swedish University of Agricultural Sciences

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