DOI: 10.1016/j.foreco.2016.03.059
Scopus记录号: 2-s2.0-84962637048
论文题名: Bridging empirical and carbon-balance based forest site productivity - Significance of below-ground allocation
作者: Mäkelä A. ; Pulkkinen M. ; Mäkinen H.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 372 起始页码: 64
结束页码: 77
语种: 英语
英文关键词: Below-ground allocation
; Dominant height
; Mean annual increment
; Picea abies
; Process-based model
; Site index
Scopus关键词: Climate change
; Climate models
; Crops
; Plant shutdowns
; Plants (botany)
; Productivity
; Soils
; Vegetation
; Below-ground allocation
; Dominant height
; Mean annual increments
; Picea abies
; Process-based modeling
; Site index
; Forestry
; belowground biomass
; biomass allocation
; carbon balance
; climate change
; coniferous tree
; ecological modeling
; empirical analysis
; forest dynamics
; forestry production
; geographical variation
; growth response
; height
; site index
; Finland
; Picea abies
英文摘要: In forestry, site productivity is commonly described using the concept of site index (SI) and its effect on the potential mean annual increment. Although a unified causal explanation between SI and productivity is still missing, operational methods have been developed to determine SI on the basis of the existing tree crop or other indirect indicators of environmental drivers. In ecology, progress has been made in deriving productivity from the carbon balance, including photosynthesis, respiration and tissue longevity, but considerable gaps remain in quantifying the impact of soil processes on below-ground carbon allocation which would be crucial for closure of the total carbon balance. Recent empirical studies in Finland have found significant and consistent differences in the foliage to fine-root ratio and fine-root lifetime between the conventional SI based on field layer vegetation in geographical vegetation zones. In this study, we utilised this information to bridge the gap between the large body of empirical information on SI and productivity, and productivity as derived from the carbon balance. We incorporated assumptions concerning the climate and soil response of the carbon balance components in a process-based model, PipeQual, and applied the approach to Norway spruce stands in Fenno-Scandian conditions. The results agreed well with an empirical growth and yield model and provided fairly accurate projections for two contrasting test sites. The study provided insights into the role of the component processes of productivity. Importantly, the north-south gradient of productivity was equally attributed to a northward decrease in temperature and an increase in carbon allocation to fine roots. This cautions against climate change projections on the basis of current growth variation with temperature and calls for improved mechanistic models incorporating plant, soil and microbial interactions in regulating the soil-forest carbon and nitrogen fluxes. © 2016 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64900
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forest Sciences, University of Helsinki, P.O. Box 27, Finland; Natural Resources Institute Finland, Jokiniemenkuja 1, Vantaa, Finland
Recommended Citation:
Mäkelä A.,Pulkkinen M.,Mäkinen H.. Bridging empirical and carbon-balance based forest site productivity - Significance of below-ground allocation[J]. Forest Ecology and Management,2016-01-01,372