Journal
PLANT AND SOIL
Volume 420, Issue 1-2, Pages 239-252Publisher
SPRINGER
DOI: 10.1007/s11104-017-3384-9
Keywords
Disturbance; Clear-cut; Fine roots; Forest C cycling; Ground vegetation; Soil CO2 efflux
Categories
Funding
- Austrian Science Fund (FWF)
- Austrian Science Fund FWF [P 25503]
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available