DOI: 10.1002/2012GB004536
Scopus记录号: 2-s2.0-84889958617
论文题名: National-scale estimates of forest root biomass carbon stocks and associated carbon fluxes in Canada
作者: Smyth C ; E ; , Kurz W ; A ; , Neilson E ; T ; , Stinson G
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 4 起始页码: 1262
结束页码: 1273
语种: 英语
英文关键词: belowground processes
; Canada's managed forest
; CBM-CFS3
; forest C ecosystem dynamics
; root dynamics
Scopus关键词: CBM-CFS3
; Ecosystem dynamics
; Environmental change
; Heterotrophic respiration
; Managed forest
; Net ecosystem production
; Net primary production
; Root dynamics
; Biomass
; Budget control
; Carbon
; Ecology
; Forestry
; aboveground biomass
; belowground biomass
; carbon budget
; carbon flux
; carbon sequestration
; empirical analysis
; estimation method
; forest ecosystem
; forest management
; growth rate
; heterotrophy
; net primary production
; root
; Canada
英文摘要: Canada's forests play an important role in the global carbon cycle through carbon (C) storage and C exchange with the atmosphere. While estimates of aboveground biomass have been improving, little is known about belowground C storage in root biomass. Here we estimated the contribution of roots to the C budget of Canada's 2.3 × 106 km2 managed forests from 1990 to 2008 using the empirical modeling approach of the Carbon Budget Model of the Canadian Forest Sector (CBM-CFS3) driven by detailed forestry data sets from the National Forest C Monitoring, Accounting and Reporting System. The estimated average net primary production (NPP) during this period was 809 Tg C yr-1 (352 g C m2 yr-1) with root growth and replacement of turnover contributing 39.8 % of NPP. Average heterotrophic respiration (Rh) was 738 Tg C yr-1 (321 g C m-2 yr-1), which resulted in a net ecosystem production (NEP) value of 31 g C m-2 yr-1(71 Tg C yr-1), and on average only 8.7% of NPP remained in the system as NEP. Estimated average root C stocks were 2.38 Pg (1235 g C m-2), mostly in coarse roots (≥ 5 mm diameter), and had an average root to shoot percentage (belowground to aboveground biomass) of 25.6%. Detailed monitoring of C exchange between forests and the atmosphere and an improved understanding of the belowground processes and their response to environmental changes are needed to improve our understanding of the terrestrial C budget. Key Points Estimated root contribution to C budget of Canada's 2.3 × 106 km2 managed forests Varying root turnover rates and recalcitrant % had small impacts on NPP and NEP NPP was 809 Tg C yr-1 with root growth and maintenance contributing 39.8% ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77550
Appears in Collections: 气候变化事实与影响
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作者单位: Natural Resources Canada, Canadian Forest Service, 506 Burnside Road W., Victoria, BC V8Z 1M5, Canada
Recommended Citation:
Smyth C,E,, Kurz W,et al. National-scale estimates of forest root biomass carbon stocks and associated carbon fluxes in Canada[J]. Global Biogeochemical Cycles,2013-01-01,27(4)