Effects Of Warming On The Structure And Function Of A Boreal Black Spruce Forest Ecosystem.

Overview

The boreal forest has a vast stock of static carbon, most of which is locked in cold, nutrient poor soils. However this critical forest biome is expected to increase in surface temperature more than any other forest biome. To assess how warming would affect this economic and ecological important biome, we designed an experiment to increase soil and air temperature 5°C above ambient temperature. Using large greenhouses and soil heating cables, soil and air warming (HI) as well as soil-only warming (HO) was ...
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Overview

The boreal forest has a vast stock of static carbon, most of which is locked in cold, nutrient poor soils. However this critical forest biome is expected to increase in surface temperature more than any other forest biome. To assess how warming would affect this economic and ecological important biome, we designed an experiment to increase soil and air temperature 5°C above ambient temperature. Using large greenhouses and soil heating cables, soil and air warming (HI) as well as soil-only warming (HO) was achieved. A control chamber (CI) assessed the effect of the chamber alone without warming compared to the control (CO). Soil surface CO2 flux (Rs) was 24% greater for HO than CO in 2004, but was only 11% greater in 2005. The HI treatment RS was 31% less than the control in 2004 and 23% less in 2005. Warming affected the black spruce phenology by producing earlier bud burst, 11 and 9 days earlier in 2004 and 2005, respectively, for HI than other treatments. In the second and third year of warming, annual shoot growth was significantly greater for HI (P ≤ 0.0013) than all other treatments. However the greater primary shoot length in 2005 was not significant when all new shoot mass across the branch was measured. In 2006 new shoot mass across the entire branch was significantly greater (P = 0.0003) for HI than other treatments. Fine root NPP was significantly less (43--66%) for the heated than control treatments and the difference between heated and control treatments increased from 2005 to 2006. Aboveground NPP (NPPA) was 87% and 116% less for HO than the control for 2005 and 2006, respectively, and NPPA was 77% and 110% less for HI than the control for 2005 and 2006, respectively. Total NPP (NPP total) for HI and HO was both only 74% and 81% of the control NPPtotal for 2005 and 2006, respectively. The results from this study suggest that warming may decrease the potential of boreal black spruce forest to sequester carbon.
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Product Details

  • ISBN-13: 9781243523051
  • Publisher: BiblioLabsII
  • Publication date: 9/3/2011
  • Pages: 140
  • Product dimensions: 7.44 (w) x 9.69 (h) x 0.30 (d)

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