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Gewählte Publikation:

Zehetgruber, B; Kobler, J; Dirnbock, T; Jandl, R; Seidl, R; Schindlbacher, A.
(2017): Intensive ground vegetation growth mitigates the carbon loss after forest disturbance
PLANT SOIL. 2017; 420(1-2): 239-252. FullText FullText_BOKU

Abstract:
Slow or failed tree regeneration after forest disturbance is increasingly observed in the central European Alps, potentially amplifying the carbon (C) loss from disturbance. We aimed at quantifying C dynamics of a poorly regenerating disturbance site with a special focus on the role of non-woody ground vegetation. Soil CO2 efflux, fine root biomass, ground vegetation biomass, tree increment and litter input were assessed in (i) an undisturbed section of a similar to 110 years old Norway spruce stand, (ii) in a disturbed section which was clear-cut six years ago (no tree regeneration), and (iii) in a disturbed section which was clear-cut three years ago (no tree regeneration). Total soil CO2 efflux was similar across all stand sections (8.5 +/- 0.2 to 8.9 +/- 0.3 t C ha(-1) yr.(-1)). The undisturbed forest served as atmospheric C sink (2.1 t C ha(-1) yr.(-1)), whereas both clearings were C sources to the atmosphere. The source strength three years after disturbance (-5.5 t C ha(-1) yr.(-1)) was almost twice as high as six years after disturbance (-2.9 t C ha(-1) yr.(-1)), with declining heterotrophic soil respiration and the high productivity of dense graminoid ground vegetation mitigating C loss. C loss after disturbance decreases with time and ground vegetation growth. Dense non-woody ground vegetation cover can hamper tree regeneration but simultaneously decrease the ecosystem C loss. The role of ground vegetation should be more explicitly taken into account in forest C budgets assessing disturbance effects.
Autor/innen der BOKU Wien:
Seidl Rupert
BOKU Gendermonitor:


Find related publications in this database (Keywords)
Disturbance
Clear-cut
Fine roots
Forest C cycling
Ground vegetation
Soil CO2 efflux


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