DOI: 10.1016/j.foreco.2017.05.023
Scopus记录号: 2-s2.0-85019572393
论文题名: Ecosystems carbon budgets of differently aged downy birch stands growing on well-drained peatlands
作者: Uri V. ; Kukumägi M. ; Aosaar J. ; Varik M. ; Becker H. ; Morozov G. ; Karoles K.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 399 起始页码: 82
结束页码: 93
语种: 英语
英文关键词: Aboveground and fine root litter
; Betula pubescens
; Carbon fluxes
; Drained peatland
; Net ecosystem production
; Soil respiration
Scopus关键词: Budget control
; Carbon dioxide
; Drainage
; Ecology
; Ecosystems
; Forestry
; Rhodium
; Soils
; Wetlands
; Betula pubescens
; Carbon fluxes
; Fine roots
; Net ecosystem production
; Peatland
; Soil respiration
; Soil pollution
; Betula pubescens
英文摘要: Estimation of the carbon (C) storages and fluxes in different forest ecosystems is essential for understanding their C sequestration ability. The net ecosystem production (NEP) and the net primary production (NPP) in five downy birch (Betula pubescens) stands, aged between 12 and 78 years, growing on fertile well-drained Histosols, were studied. Drainage of swamp forests is a large-scale manipulation, which causes significant shifts at the ecosystems level, altering C and nutrient cycling a great deal. Young and middle-aged downy birch stands (12–30-year-old) acted as C sink ecosystems, accumulating 1.4–3.0 t C ha−1 yr−1. In the 38-year-old stand NEP was roughly zero; annual C budget was almost in balance. The over-matured downy birch stand (78-year-old) acted as a C source emitting 0.95 t C ha−1 yr−1. Annual woody biomass increment of the stand was the main factor which affected the forest to act as a C accumulating system. Although the highest heterotrophic respiration (Rh) values were measured in the middle-aged stands, mean soil C emission did not differ significantly between the studied stands. Annual total soil respiration (Rs) and Rh ranged from 7.4 to 8.8 t C ha−1 and 4.7 to 6.2 t C ha−1, respectively. Soil temperature appeared to be the dominant driver of the soil CO2 effluxes. Temperature sensitivity (Q10 value) of respiration rates (3.0–5.5), as well as the Rh/Rs (0.6–0.7) varied irrespective of stand age. Both the annual aboveground litter (1.5–1.9 t C ha−1 yr−1) and fine root litter (0.9–1.5 t C ha−1 yr−1) input fluxes were quite similar for the studied stands. However, the annual organic C input into the soil via above- and belowground litter was smaller than the annual Rh efflux, indicating that continuous mineralization of the peat layer reduces the soil organic C pool. The main share of the C stock in the drained swamp downy birch stands was soil C; the storage of C accumulated in the woody biomass of the trees accounted for only 5–20% of the total C storage of the ecosystem. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64263
Appears in Collections: 影响、适应和脆弱性
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作者单位: Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu, Estonia; Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, Tartu, Estonia
Recommended Citation:
Uri V.,Kukumägi M.,Aosaar J.,et al. Ecosystems carbon budgets of differently aged downy birch stands growing on well-drained peatlands[J]. Forest Ecology and Management,2017-01-01,399