Drobyshev, Igor; Simard, Martin; Bergeron, Yves; Hofgaard, Annika (2010): (Table 1) Tree age, post fire stand age, and soil organic matter thickness in the western Quebec black spruce boreal ecosystem [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.809315, Supplement to: Drobyshev, I et al. (2010): Does Soil Organic Layer Thickness Affect Climate-Growth Relationships in the Black Spruce Boreal Ecosystem? Ecosystems, 13(4), 556-574, https://doi.org/10.1007/s10021-010-9340-7
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Abstract:
The observed long-term decrease in the regional fire activity of Eastern Canada results in excessive accumulation of organic layer on the forest floor of coniferous forests, which may affect climate-growth relationships in canopy trees. To test this hypothesis, we related tree-ring chronologies of black spruce (Picea mariana (Mill.) B.S.P.) to soil organic layer (SOL) depth at the stand scale in the lowland forests of Quebec's Clay Belt. Late-winter and early-spring temperatures and temperature at the end of the previous year's growing season were the major monthly level environmental controls of spruce growth. The effect of SOL on climate-growth relationships was moderate and reversed the association between tree growth and summer aridity from a negative to a positive relationship: trees growing on thin organic layers were thus negatively affected by drought, whereas it was the opposite for sites with deep (>20-30 cm) organic layers. This indicates the development of wetter conditions on sites with thicker SOL. Deep SOL were also associated with an increased frequency of negative growth anomalies (pointer years) in tree-ring chronologies. Our results emphasize the presence of nonlinear growth responses to SOL accumulation, suggesting 20-30 cm as a provisional threshold with respect to the effects of SOL on the climate-growth relationship. Given the current climatic conditions characterized by generally low-fire activity and a trend toward accumulation of SOL, the importance of SOL effects in the black spruce ecosystem is expected to increase in the future.
Project(s):
Coverage:
Median Latitude: 49.500000 * Median Longitude: -78.750000 * South-bound Latitude: 49.000000 * West-bound Longitude: -79.000000 * North-bound Latitude: 50.000000 * East-bound Longitude: -78.500000
Minimum Elevation: 250.0 m * Maximum Elevation: 400.0 m
Event(s):
Comment:
Age of the oldest tree represents the minimum post fire stand age (minimum time since the last fire in the stand). Mean age refers to the age of trees used for building site chronology. Oldest tree found in the stand did not necessarily contribute to the site chronology. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Site | Site | Drobyshev, Igor | |||
| 2 | Age, relative, number of years | Age | a | Drobyshev, Igor | mean tree age | |
| 3 | Age, standard deviation | Age std dev | ± | Drobyshev, Igor | mean tree age | |
| 4 | Age, relative, number of years | Age | a | Drobyshev, Igor | post fire stand age; # = date was obtained from radiocarbon dating of charcoals | |
| 5 | Organic matter, layer thickness | OM | cm | Drobyshev, Igor | ||
| 6 | Organic matter, standard deviation | OM std dev | ± | Drobyshev, Igor |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
96 data points