A5081269940- Plant Water Relations and Carbon Dynamics
- Fire effects on ecosystems
- Forest ecology and management
- Seedling growth and survival studies
- Tree-ring climate responses
- Peatlands and Wetlands Ecology
- Plant responses to elevated CO2
- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Ecology and Vegetation Dynamics Studies
- Soil Carbon and Nitrogen Dynamics
- Remote Sensing and LiDAR Applications
- Soil Management and Crop Yield
- Horticultural and Viticultural Research
- Wood Treatment and Properties
- Ecology and Conservation Studies
- Aeolian processes and effects
- Computational Drug Discovery Methods
- Cell Image Analysis Techniques
- Hydrology and Watershed Management Studies
- Coal and Its By-products
- Botany and Plant Ecology Studies
- Agriculture, Soil, Plant Science
- Growth and nutrition in plants
- Rangeland and Wildlife Management
Natural Resources Canada
1998-2025
Canadian Forest Service
1998-2025
Centre de Géomatique du Québec
2011-2015
Université Laval
2002-2015
Abstract The FLUXNET2015 dataset provides ecosystem-scale data on CO 2 , water, and energy exchange between the biosphere atmosphere, other meteorological biological measurements, from 212 sites around globe (over 1500 site-years, up to including year 2014). These sites, independently managed operated, voluntarily contributed their create global datasets. Data were quality controlled processed using uniform methods, improve consistency intercomparability across sites. is already being used...
Abstract Although mature black spruce forests are a dominant cover type in the boreal forest of North America, it is not clear how their carbon (C) budgets vary across continent. The installation an eddy covariance flux tower on Old Black Spruce (OBS) site eastern Canada (EOBS, Québec) provided first opportunity to compare and contrast its annual (2004) seasonal C exchange with two other pre‐existing OBS sites from different climatic regions located Saskatchewan [Southern (SOBS)] Manitoba...
The proliferation of digital cameras co‐located with eddy covariance instrumentation provides new opportunities to better understand the relationship between canopy phenology and seasonality photosynthesis. In this paper we analyze abilities limitations color metrics measured by repeat photography track seasonal development photosynthesis, determine phenological transition dates, estimate intra‐annual interannual variability in We used 59 site‐years camera imagery net ecosystem exchange...
A Correction to this paper has been published: https://doi.org/10.1038/s41597-021-00851-9.
Net ecosystem productivity (NEP) during August 2003 was measured by using eddy covariance above 17 forest and 3 peatland sites along an eastwest continental-scale transect in Canada. Measured included recently disturbed stands, young intermediate-aged conifer mature deciduous fens, open shrub bog. Diurnal courses of NEP showed strong coherence within the different categories. Recently weakest diurnal cycle; conifers, strongest. The western treed fen had a more pronounced pattern than...
This study investigated the relationships between acoustic velocity (AV) measured on standing trees, stems, logs, and lumber pieces, static bending stiffness (MOE) strength (MOR). The were examined at four measurement scales: i.e. tree-, stem-, log-, lumber-level. impacts of tree log characteristics wood properties model performance also examined. strongest relationship among AVs was found AV stem (R2=0.877) levels (R2=0.454), level (R2=0.125). No or weak tree/stem all levels. Lumber MOE MOR...
Abstract Process‐based models are effective tools to synthesize and/or extrapolate measured carbon (C) exchanges from individual sites large scales. In this study, we used a C‐ and nitrogen (N)‐cycle coupled ecosystem model named CN‐CLASS (Carbon Nitrogen‐Canadian Land Surface Scheme) study the role of primary climatic controls site‐specific C stocks on net productivity (NEP) seven intermediate‐aged mature coniferous forest across an east–west continental transect in Canada. The was...
Abstract. This study reports continuous automated measurements of forest floor carbon (C) exchange over feathermoss, lichen, and sphagnum micro-sites in a black spruce eastern North America during snow-free periods three years. The response soil respiration (Rs-auto) photosynthesis (Pff) to environmental factors was determined. seasonal contributions scaled up Rs-auto adjusted for spatial representativeness (Rs-adj) Pff (Pff-eco) relative that total ecosystem (Re) (Peco), respectively, were...
Climate change is steering tree breeding programs towards the development of families and genotypes that will be adapted more resilient to changing environments. Making genotype-phenotype-environment connections central these predictions it requires evaluation functional traits such as photosynthetic rates can linked environmental variables. However, ability rapidly measure parameters has always been limiting. The estimation Vc,max Jmax using CO2 response curves traditionally time consuming,...
The relationship between photosynthesis and accumulated cold degree days (CDD) over the late growing season was examined at shoot, ecosystem landscape scales in a boreal cutover eastern Canada predominated by black spruce (Picea mariana Mill. BSP), lowbush blueberry (Vaccinium angustifolium Ait.) sheep laurel (Kalmia angustifolia L.). We calculated CDD as sum of minimum daily temperatures below 5 °C threshold. Light-saturated shoot level (Amax) V. decreased steadily with increasing once...
Disturbances control the landscape-level C dynamics of boreal forests, but post-disturbance are usually poorly quantified. In current study, we use 10 years CO 2 flux measurements at a black spruce ( Picea mariana (Mill.) B.S.P.) cutover in eastern Canada to estimate time neutrality, quantify relative role respiration versus photosynthesis during recovery, and determine agreement between cumulated fluxes plot-level changes content. The site was net source 139 g C·m –2 ·year –1 post-harvest,...
The impact of freezing temperatures and exposure times during budbreak shoot elongation on 10-month-old containerized white spruce seedlings [Picea glauca (Moench) Voss] was studied. Seedlings were exposed to 0, −2, −4, −6, −8 −10°C for 1, 2, 3, 4, 5 6 h at four stages (stage 1: unswollen bud; stage 2: swollen 3: bud scales parted by emerging needles; 4: 1–5 cm terminal growth). Seedling survival, viability first-year needles (developed before frost exposure), length, stem diameter aerial...
The root systems of 2-yr-old Picea glauca, mariana and Pinus banksiana seedlings were submitted to various frost temperatures during an artificial induce different levels damage. Frost-damaged control placed in a greenhouse under high low soil moisture regimes. Seedling growth physiology evaluated periodically. survival was reduced when damage reached 60-80%. Root all three species showed partial total recovery by the end experiment. In general, freezing caused reductions seedling growth,...
Frost tolerance during the germination stages of four white spruce (Picea glauca (Moench) Voss) provenances (between 45°37' and 50°17'N) was studied at different developmental (imbibed seed, radicle, cotyledon, young seedling), their hardening capacity determined for latter three stages. Hardening examined by submitting radicle-stage germinants to two temperature-photoperiod treatments (20:15°C - 16-h photoperiod or 5:5°C 8 h) 14 days cotyledon seedling stage 16 h; 20:15°C h). immediately...
Long-night treatments (16 h) of 0 (control), 4, 8, 12, and 16 days duration were applied, in August 1994, to four provenances 10-week-old white spruce (Picea glauca (Moench) Voss) seedlings. This was determine the shortest that would produce seedlings having acceptable morphological physiological characteristics for reforestation. The effects these latitude origin on course dehardening second-year growth studied. Terminal bud burst, shoot root dry mass accumulation, frost tolerance followed...
Whole root systems of 2-yr-old containerized white spruce [Picea glauca (Moench) Voss], black mariana (Mill.) B.S.P.] and jack pine (Pinus banksiana Lamb.) seedlings, with intact plugs, were exposed to various frost temperatures, which a preliminary test indicated would induce approximately 0 (control), 20, 40, 60, 80 nearly 100% damage. Damage was evaluated using: (1) two measures electrolyte leakage (relative conductivity total tissue after autoclaving); (2) water loss pressurization; (3)...
The effects of induced root freezing injury on 2+0 white spruce (Picea glauca (Moench) Voss), black mariana (Mill.) BSP), and jack pine (Pinus banksiana Lamb.) seedlings were studied. Hardened exposed to during the fall cold stored until planting. Seedlings planted in spring two field sites with different soil moisture levels (wet or dry). Seedling morphology physiology measured periodically first growing season, mortality was evaluated at end season. With exception June measurements wet...
Abstract In northern landscapes, peatlands are widespread and their hydrological processes complex. Furthermore, they typically remote, limiting the amount accuracy of in situ measurements. This is especially case for evapotranspiration ET, which strongly influences watershed hydrology. The objective this paper to demonstrate validity bulk-transfer approach estimate ET over boreal peatlands. simplicity model relies on four assumptions: (i) near-neutral atmospheric conditions; (ii) wet...