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Climate change disrupts the seasonal coupling of plant and soil microbial nutrient cycling in an alpine ecosystem.
Glob. Change Biol. 30:e17245 (2024)
The seasonal coupling of plant and soil microbial nutrient demands is crucial for efficient ecosystem nutrient cycling and plant production, especially in strongly seasonal alpine ecosystems. Yet, how these seasonal nutrient cycling processes are modified by climate change and what the consequences are for nutrient loss and retention in alpine ecosystems remain unclear. Here, we explored how two pervasive climate change factors, reduced snow cover and shrub expansion, interactively modify the seasonal coupling of plant and soil microbial nitrogen (N) cycling in alpine grasslands, which are warming at double the rate of the global average. We found that the combination of reduced snow cover and shrub expansion disrupted the seasonal coupling of plant and soil N-cycling, with pronounced effects in spring (shortly after snow melt) and autumn (at the onset of plant senescence). In combination, both climate change factors decreased plant organic N-uptake by 70% and 82%, soil microbial biomass N by 19% and 38% and increased soil denitrifier abundances by 253% and 136% in spring and autumn, respectively. Shrub expansion also individually modified the seasonality of soil microbial community composition and stoichiometry towards more N-limited conditions and slower nutrient cycling in spring and autumn. In winter, snow removal markedly reduced the fungal:bacterial biomass ratio, soil N pools and shifted bacterial community composition. Taken together, our findings suggest that interactions between climate change factors can disrupt the temporal coupling of plant and soil microbial N-cycling processes in alpine grasslands. This could diminish the capacity of these globally widespread alpine ecosystems to retain N and support plant productivity under future climate change.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Alpine Ecosystems ; Climate Change ; Nutrient Cycling ; Plant–soil Interactions ; Seasonality ; Shrub Expansion ; Snow Cover; Organic-nitrogen; Vegetation; Responses; Linkages; Carbon; Availability; Extraction; Damage
ISSN (print) / ISBN
1354-1013
e-ISSN
1365-2486
Journal
Global Change Biology
Quellenangaben
Volume: 30,
Issue: 3,
Article Number: e17245
Publisher
Wiley
Publishing Place
111 River St, Hoboken 07030-5774, Nj Usa
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Research Unit Comparative Microbiome Analysis (COMI)
Grants
Natural Environment Research Council
Ramon Areces Foundation Research Fellowship
Biotechnology and Biological Sciences Research Council
Ramon Areces Foundation Research Fellowship
Biotechnology and Biological Sciences Research Council