Carbon stock and stock changes across a Sitka spruce chronosequence on surface-water gley soils
Authors: Black, Kevin; Byrne, Kenneth A.; Mencuccini, Maurizio; Tobin, Brian; Nieuwenhuis, Maarten; Reidy, Brian; Bolger, Tom; Saiz, Gustavo; Green, Carly; Farrell, Edward T.; Osborne, Bruce
Source: Forestry, Volume 82, Number 3, 20 July 2009 , pp. 255-272(18)
Publisher: Oxford University Press
Abstract:We assessed age-related alterations in carbon (C) stocks and sequestration rates of first rotation Sitka spruce (Picea sitchensis (Bong.) Carr) plantations on predominantly surface-water gley soils. Sites were selected to represent a typical Sitka spruce chronosequence following land use transition from grasslands dominated by surface-water gley soils. Based on inventory, eddy covariance, physiological and modelling assessments of net ecosystem productivity (NEP), we show that afforested stands are a C sink at 10 years, and possibly earlier, followed by an increase to a maximum of 9 t C ha1 year1 before the first thinning cycle. NEP subsequently declined from 9 t C ha1 year1, at closed canopy, to 2 t C ha1 year1 in older and thinned stands. Reductions in the C sequestration rate of older stands were coupled with a decrease in gross primary productivity, increases in maintenance/growth respiration and decomposition losses following harvest. We suggest that the high sequestration potential of these forests may be associated with the high net primary productivity of these plantations in Ireland, a high allocation of assimilates and litter into the belowground C pool and accumulation of C in mineral gley soils following afforestation.
Document Type: Research Article
Publication date: 2009-07-20
- Forestry publishes refereed papers on all aspects of research, practice and policy that promote the sustainable development of forests, woodlands and trees. In considering suitability for publication attention is given to both the originality of contributions and their practical application. Preference is usually given to work undertaken in the temperate and/or boreal zones; only articles of exceptional merit from tropical zones will also be considered.