DOI: 10.1016/j.foreco.2013.06.029
Scopus记录号: 2-s2.0-84887611351
论文题名: Above- and below-ground N stocks in coniferous boreal forests in Finland: Implications for sustainability of more intensive biomass utilization
作者: Merilä P. ; Mustajärvi K. ; Helmisaari H.-S. ; Hilli S. ; Lindroos A.-J. ; Nieminen T.M. ; Nöjd P. ; Rautio P. ; Salemaa M. ; Ukonmaanaho L.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 311 起始页码: 17
结束页码: 28
语种: 英语
英文关键词: Nitrogen pools
; Picea abies
; Pinus sylvestris
; Roots
; Understory vegetation
; Whole-tree harvest
Scopus关键词: Biomass
; Climate change
; Deposition
; Ecosystems
; Harvesting
; Needles
; Soils
; Sustainable development
; Vegetation
; Nitrogen pools
; Picea abies
; Pinus sylvestris
; Roots
; Understory vegetation
; Whole-tree harvest
; Forestry
; anthropogenic effect
; biofuel
; biomass
; boreal forest
; coniferous forest
; forest ecosystem
; forest soil
; harvesting
; litter
; productivity
; root system
; sustainability
; understory
; Finland
; Picea
; Picea abies
; Pinus echinata
; Pinus sylvestris
英文摘要: Nitrogen (N) is typically the growth-limiting factor in boreal forest ecosystems. Therefore, knowledge on forest N stocks and fluxes is crucial in order to predict and evaluate the effects of different anthropogenic factors (e.g. climate change, air pollutant deposition, forest management practices) on the condition, development and sustainability of boreal forests. In this study, we evaluated the amount and distribution of N and biomass in different compartments of forest ecosystem, including not only tree stand and soil, but also such rarely reported N stocks as litter layer, ground vegetation and fine and small roots. We also calculated the theoretical export of N in three forest harvest regimes of different intensity (stem-only harvest, whole-tree harvest, whole-tree harvest and stump uplifting) and assessed the time required for N deposition to compensate the N losses occurring in them. The study included seven Scots pine and eight Norway spruce dominated stands belonging to the UN-ECE ICP Forests Level II programme in Finland. The average effective temperature sum and stand age of the sites ranged 658-1351 d.d. and 55-200 yrs, respectively. Among the study sites, the total biomass (needles, living and dead branches, stems, bark, stumps, coarse roots, fine and small roots, understory, litter, humus and mineral soil layers) ranged from 178Mg ha-1 to 541Mg ha-1, the respective range for N stock being 1890-7530kg ha-1. The two largest pools of N in forest ecosystem were mineral soil (depth 0-40cm; mean=70%) and humus layer (mean=16%). The largest living biomass N stock was in stems in pine stands (88kg ha-1) and in needles in spruce stands (134kg ha-1). Nstored in tree biomass accounted for 7-19% of the total ecosystem N stock. The proportion of N stored in potential logging residues or biofuel (needles, living and dead branches, stumps and coarse roots) was 67±4% and 53±5% of the tree N stock in northern spruce stands and in southern pine stands, respectively. The understory vegetation N stock was the largest in northern spruce stands, and the lowest in southern spruce stands. Our results supported the hypothesis that in boreal coniferous forests, inputs of N by deposition accumulating during the following rotation period will be able to replenish the export of N caused by conventional stem-only-harvest in final cutting, but the sustainability of the site productivity will be challenged when more intense whole tree harvest regimes are practiced, especially in Norway spruce stands. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66218
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Finnish Forest Research Institute (Metla), Oulun yliopisto, P.O. Box 413, 90014 Oulu, Finland; Metla, Parkano, Kaironiementie 15, 39700 Parkano, Finland; Metla, Vantaa, P.O. Box 18, 01301 Vantaa, Finland; Metla, Rovaniemi, P.O. Box 16, 96301 Rovaniemi, Finland; 00014 University of Helsinki, Forest Sciences Building, Viikki, P.O. Box 27, Finland
Recommended Citation:
Merilä P.,Mustajärvi K.,Helmisaari H.-S.,et al. Above- and below-ground N stocks in coniferous boreal forests in Finland: Implications for sustainability of more intensive biomass utilization[J]. Forest Ecology and Management,2014-01-01,311