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- Title
Soil carbon stabilization in jack pine stands along the Boreal Forest Transect Case Study.
- Authors
NORRIS, C. E.; QUIDEAU, S. A.; BHATTI, J. S.; WASYLISHEN, R. E.
- Abstract
Boreal forests, containing >20% of the total organic carbon (OC) present at the surface of the Earth, are expected to be highly vulnerable to global warming. The objective of this study was to compare soil OC stocks and chemistry in jack pine stands located along a latitudinal climatic transect in central Canada. Total OC stocks (0-1 m) increased with decreasing mean annual temperature (MAT). We used a combination of physical fractionation of soil OC pools, C isotopic determination and cross-polarization, magic-angle spinning C nuclear magnetic resonance (NMR) spectroscopy to further characterize OC composition at all sites. Soil OC was dominated by labile pools. As illustrated by the C/N ratios, δC data and results from the C NMR analysis, the light fraction showed little alteration within the soil profiles. Instead, this fraction reflected the importance of fresh litter inputs and showed an increase in root contribution with depth. As opposed to the light fraction, the clay- and silt-stabilized OC exhibited an increase in δC and a decrease in C/N with depth, indicating an increase in its degree of decomposition. These changes with depth were more marked at the southern than the northern sites. Results hence suggest that if the MAT were to increase in the northern boreal forest the overall jack pine soil OC stocks would decrease but the remaining OC would become more decomposed, and likely more stabilized than what is currently present within the soils.
- Subjects
TAIGAS; JACK pine; GREENHOUSE effect; ARABLE land; SOIL profiles; GLOBAL temperature changes
- Publication
Global Change Biology, 2011, Vol 17, Issue 1, p480
- ISSN
1354-1013
- Publication type
Article
- DOI
10.1111/j.1365-2486.2010.02236.x