Plant-soil interactions alter nitrogen and phosphorus dynamics in an advancing subarctic treeline.

biogeochemistry climate change elevation gradient extracellular enzymatic activity forest microbial biomass nutrient cycling stoichiometry tundra

Journal

Global change biology
ISSN: 1365-2486
Titre abrégé: Glob Chang Biol
Pays: England
ID NLM: 9888746

Informations de publication

Date de publication:
Mar 2024
Historique:
revised: 22 01 2024
received: 31 10 2023
accepted: 22 01 2024
medline: 4 3 2024
pubmed: 4 3 2024
entrez: 3 3 2024
Statut: ppublish

Résumé

Treelines advance due to climate warming. The impacts of this vegetation shift on plant-soil nutrient cycling are still uncertain, yet highly relevant as nutrient availability stimulates tree growth. Here, we investigated nitrogen (N) and phosphorus (P) in plant and soil pools along two tundra-forest transects on Kola Peninsula, Russia, with a documented elevation shift of birch-dominated treeline by 70 m during the last 50 years. Results show that although total N and P stocks in the soil-plant system did not change with elevation, their distribution was significantly altered. With the transition from high-elevation tundra to low-elevation forest, P stocks in stones decreased, possibly reflecting enhanced weathering. In contrast, N and P stocks in plant biomass approximately tripled and available P and N in the soil increased fivefold toward the forest. This was paralleled by decreasing carbon (C)-to-nutrient ratios in foliage and litter, smaller C:N:P ratios in microbial biomass, and lower enzymatic activities related to N and P acquisition in forest soils. An incubation experiment further demonstrated manifold higher N and P net mineralization rates in litter and soil in forest compared to tundra, likely due to smaller C:N:P ratios in decomposing organic matter. Overall, our results show that forest expansion increases the mobilization of available nutrients through enhanced weathering and positive plant-soil feedback, with nutrient-rich forest litter releasing greater amounts of N and P upon decomposition. While the low N and P availability in tundra may retard treeline advances, its improvement toward the forest likely promotes tree growth and forest development.

Identifiants

pubmed: 38433308
doi: 10.1111/gcb.17200
doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

e17200

Subventions

Organisme : Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
ID : 171171
Organisme : Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
ID : PZ00P2_174047
Organisme : Deutsche Forschungsgemeinschaft
ID : KA1673/9-2
Organisme : Austrian Science Fund
ID : J-4369

Informations de copyright

© 2024 The Authors. Global Change Biology published by John Wiley & Sons Ltd.

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Auteurs

Jasmin Fetzer (J)

Forest Soils and Biogeochemistry, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland.
Department of Environmental Systems Science, ETH Zurich, Zürich, Switzerland.

Pavel Moiseev (P)

Institute of Plant and Animal Ecology, Ekaterinenburg, Russia.

Emmanuel Frossard (E)

Department of Environmental Systems Science, ETH Zurich, Zürich, Switzerland.

Klaus Kaiser (K)

Soil Science and Soil Protection, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany.

Mathias Mayer (M)

Forest Soils and Biogeochemistry, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland.
Department of Forest and Soil Sciences, Institute of Forest Ecology, University of Natural Resources and Life Sciences (BOKU), Vienna, Austria.
Forest Ecology, Institute of Terrestrial Ecosystems (ITES), ETH Zurich, Zurich, Switzerland.

Konstantin Gavazov (K)

Forest Soils and Biogeochemistry, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland.

Frank Hagedorn (F)

Forest Soils and Biogeochemistry, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland.

Classifications MeSH