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- W2509601712 abstract "Sub-arctic birch forests (Betula pubescens Ehrh. ssp. czerepanovii) periodically suffer large-scale defoliation events caused by the caterpillars of the geometrid moths Epirrita autumnata and Operophtera brumata. Despite their obvious influence on ecosystem primary productivity, little is known about how the associated reduction in belowground C allocation affects soil processes. We quantified the soil response following a natural defoliation event in sub-arctic Sweden by measuring soil respiration, nitrogen availability and ectomycorrhizal fungi (EMF) hyphal production and root tip community composition. There was a reduction in soil respiration and an accumulation of soil inorganic N in defoliated plots, symptomatic of a slowdown of soil processes. This coincided with a reduction of EMF hyphal production and a shift in the EMF community to lower autotrophic C-demanding lineages (for example, /russula-lactarius). We show that microbial and nutrient cycling processes shift to a slower, less C-demanding state in response to canopy defoliation. We speculate that, amongst other factors, a reduction in the potential of EMF biomass to immobilise excess mineral nitrogen resulted in its build-up in the soil. These defoliation events are becoming more geographically widespread with climate warming, and could result in a fundamental shift in sub-arctic ecosystem processes and properties. EMF fungi may be important in mediating the response of soil cycles to defoliation and their role merits further investigation." @default.
- W2509601712 created "2016-09-16" @default.
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- W2509601712 creator A5079741687 @default.
- W2509601712 date "2016-08-25" @default.
- W2509601712 modified "2023-09-22" @default.
- W2509601712 title "Slowed Biogeochemical Cycling in Sub-arctic Birch Forest Linked to Reduced Mycorrhizal Growth and Community Change after a Defoliation Event" @default.
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- W2509601712 doi "https://doi.org/10.1007/s10021-016-0026-7" @default.
- W2509601712 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7089692" @default.
- W2509601712 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32226280" @default.
- W2509601712 hasPublicationYear "2016" @default.
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