caa a22 4500 467918783 CHVBK 20180406152910.0 cr unu---uuuuu 170328e20060101xx s 000 0 eng 10.1007/s10584-006-0466-8 doi (NATIONALLICENCE)springer-10.1007/s10584-006-0466-8 Stocks, Chemistry, and Sensitivity to Climate Change of Dead Organic Matter Along the Canadian Boreal Forest Transect Case Study [Elektronische Daten] [C. Preston, J. Bhatti, L. Flanagan, C. Norris] Improving our ability to predict the impact of climate change on the carbon (C) balance of boreal forests requires increased understanding of site-specific factors controlling detrital and soil C accumulation. Jack pine (Pinus banksiana) and black spruce (Picea mariana) stands along the Boreal Forest Transect Case Study (BFTCS) in northern Canada have similar C stocks in aboveground vegetation and large woody detritus, but thick forest floors of poorly-drained black spruce stands have much higher C stocks, comparable to living biomass. Their properties indicate hindered decomposition and N cycling, with high C/N ratios, strongly stratified and depleted δ13C and δ15N values, high concentrations of tannins and phenolics, and 13C nuclear magnetic resonance (NMR) spectra typical of poorly decomposed plant material, especially roots and mosses. The thinner jack pine forest floor appears to be dominated by lichen, with char in some samples. Differences in quantity and quality of aboveground foliar and woody litter inputs are small and unlikely to account for the contrasts in forest floor accumulation and properties. These are more likely associated with site conditions, especially soil texture and drainage, exacerbated by increases in sphagnum coverage, forest floor depth, and tannins. Small changes in environmental conditions, especially reduced moisture, could trigger large C losses through rapid decomposition of forest floor in poorly drained black spruce stands in this region. Springer Science + Business Media, Inc., 2006 Preston C. Pacific Forestry Centre, Natural Resources Canada, V8Z 1M5, Victoria, BC, Canada aut Bhatti J. Northern Forestry Centre, Natural Resources Canada, T6H 3S5, Edmonton, AB, Canada aut Flanagan L. Department of Biological Sciences, University of Lethbridge, T1K 3M4, Lethbridge, AB, Canada aut Norris C. Pacific Forestry Centre, Natural Resources Canada, V8Z 1M5, Victoria, BC, Canada aut Climatic Change Springer Netherlands 74/1-3(2006-01-01), 223-251 0165-0009 74:1-3<223 2006 74 10584 https://doi.org/10.1007/s10584-006-0466-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10584-006-0466-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Preston C. Pacific Forestry Centre, Natural Resources Canada, V8Z 1M5, Victoria, BC, Canada aut NATIONALLICENCE 700 1- Bhatti J. Northern Forestry Centre, Natural Resources Canada, T6H 3S5, Edmonton, AB, Canada aut NATIONALLICENCE 700 1- Flanagan L. Department of Biological Sciences, University of Lethbridge, T1K 3M4, Lethbridge, AB, Canada aut NATIONALLICENCE 700 1- Norris C. Pacific Forestry Centre, Natural Resources Canada, V8Z 1M5, Victoria, BC, Canada aut NATIONALLICENCE 773 0- Climatic Change Springer Netherlands 74/1-3(2006-01-01), 223-251 0165-0009 74:1-3<223 2006 74 10584 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer