scholarly journals Stomatal Conductance and Sulfur Uptake of Five Clones of Populus tremuloides Exposed to Sulfur Dioxide

1981 ◽  
Vol 67 (5) ◽  
pp. 990-995 ◽  
Author(s):  
Thomas W. Kimmerer ◽  
T. T. Kozlowski
Keyword(s):  
Stomatal Conductance ◽  
Sulfur Dioxide ◽  
Populus Tremuloides

The effect of ectomycorrhizae on water relations in aspen (Populus tremuloides) and white spruce (Picea glauca) at low soil temperatures

2002 ◽  
Vol 80 (6) ◽  
pp. 684-689 ◽  
Author(s):  
Simon M Landhäusser ◽  
Tawfik M Muhsin ◽  
Janusz J Zwiazek
Keyword(s):  
Stomatal Conductance ◽  
Soil Temperature ◽  
Water Uptake ◽  
Water Relations ◽  
Populus Tremuloides ◽  
Picea Glauca ◽  
White Spruce ◽  
Hydraulic Conductance ◽  
Root Hydraulic Conductance ◽  
Soil Temperatures

Low soil temperatures, common during the growing season in northern forests, have the potential to impede plant growth. In this study, water uptake, water relations, and growth characteristics were examined in aspen (Populus tremuloides) and white spruce (Picea glauca) seedlings that were inoculated with ectomycorrhizal fungi and grown at 20°C daytime air temperatures and low soil temperatures of 4°C and 8°C. Mycorrhizal associations had little effect on root and shoot biomass at both soil temperatures. Root hydraulic conductance (Kr) was higher in both mycorrhizal plant species compared to nonmycorrhizal plants, but there was no soil temperature effect on Kr in either species. Mycorrhizae also increased shoot water potential (Ψw) in Populus tremuloides but had no effect on Ψw in Picea glauca. The increases in Kr and Ψw were not reflected by changes in stomatal conductance (gs) and transpiration rates (E), suggesting that the reduction of water flow in seedlings exposed to low soil temperature was not likely the factor limiting gs in both plant species.Key words: boreal forest, root hydraulic conductance, root growth, stomatal conductance, water uptake.

Sulfur dioxide injury, sulfur content, and stomatal conductance of birch foliage

1981 ◽  
Vol 11 (1) ◽  
pp. 69-72 ◽  
Author(s):  
A. R. Biggs ◽  
D. D. Davis
Keyword(s):  
Stomatal Conductance ◽  
Sulfur Dioxide ◽  
Sulfur Content ◽  
Leaf Conductance ◽  
Visible Injury ◽  
Relative Susceptibility

Seedlings of three birch species were exposed biweekly to 2358 μg/m3 (0.9 ppm) SO2 for 2 h from May to September 1977. Leaf sulfur content of the birch foliage increased following exposure to SO2, but sulfur accumulation was not correlated with visible injury. Relative susceptibility was significantly correlated with preexposure leaf conductance rates of Betulanigra L. and B. papyrifera Marsh., but not for B. pubescens Ehrh. Leaf conductance rates were not correlated with sulfur accumulation.

Enhanced water relations of residual foliage following defoliation in Populus tremuloides

2000 ◽  
Vol 78 (5) ◽  
pp. 583-590 ◽  
Author(s):  
Miranda Hart ◽  
E H Hogg ◽  
V J Lieffers
Keyword(s):  
Stomatal Conductance ◽  
Water Potential ◽  
Water Relations ◽  
Leaf Water Potential ◽  
Populus Tremuloides ◽  
Vapour Pressure ◽  
Leaf Water ◽  
Controlled Conditions ◽  
Rate Of Photosynthesis ◽  
Compensatory Photosynthesis

Stomatal conductance and leaf water potential of aspen (Populus tremuloides Michx.) were measured in response to defoliation intensity, both in the field and under controlled conditions. There was evidence of increased stomatal conductance in trees with 50 and 98% defoliation, but no change in leaf water potential. Under controlled conditions, stomatal conductance and rate of photosynthesis were measured under high and low vapour pressure deficits (VPD). Under high VPD, overall stomatal conductance and rates of photosynthesis were greatly reduced. However, in both VPD treatments, there was evidence of increased stomatal conductance and compensatory photosynthesis following defoliation. These findings may be due to increases in leaf specific hydraulic conductance following defoliation.Key words: defoliation, stomatal conductance, leaf water potential, compensatory photosynthesis.

Stomatal conductance and xylem sap properties of aspen (Populus tremuloides) in response to low soil temperature

2004 ◽  
Vol 122 (1) ◽  
pp. 79-85 ◽  
Author(s):  
Xianchong Wan ◽  
Simon M. Landhausser ◽  
Janusz J. Zwiazek ◽  
Victor J. Lieffers
Keyword(s):  
Stomatal Conductance ◽  
Soil Temperature ◽  
Populus Tremuloides ◽  
Xylem Sap

Root connections can trigger physiological responses to defoliation in nondefoliated aspen suckers

Botany ◽  
2011 ◽  
Vol 89 (11) ◽  
pp. 753-761 ◽  
Author(s):  
Matthieu Baret ◽  
Annie DesRochers
Keyword(s):  
Stomatal Conductance ◽  
Populus Tremuloides ◽  
Forest Dynamics ◽  
Physiological Responses ◽  
Stand Dynamics ◽  
High Humidity ◽  
High Moisture ◽  
Maximum Capacity ◽  
Root Suckering ◽  
Moisture Conditions

In species such as aspen ( Populus tremuloides Michx.), trees are interconnected through their root system owing to their regeneration mode by root suckering. These root connections challenge classic notions of forest dynamics that consider trees as individuals competing for resources, because root connections allow trees to share water, minerals, and carbohydrates. The purpose of this study was to demonstrate that trees can directly influence the physiology of other nearby trees through root connections. In the summers of 2007 and 2008, pairs of aspen suckers (i.e., two suckers connected by a parental root) were selected and divided into three height classes and compared with each other (dominant, codominant, suppressed). Suckers distally positioned on the parental root were manually defoliated, and the effects of defoliation on photosynthesis, stomatal conductance, and specific leaf area (SLA) were measured on connected but nondefoliated suckers. Results showed that defoliation caused physiological responses in the interconnected trees in summer 2007, which was drier than summer 2008. Defoliation of a connected sucker had a greater effect on suppressed suckers, for which mean photosynthesis rate increased by 17% compared with that of controls. The effect was less important for codominant (14% increase) and dominant (12%) trees. SLA of suppressed suckers also increased, while the increase in SLA values was smaller for codominant and dominant suckers. In summer 2008, no defoliation effect was observed, probably owing to high moisture conditions that resulted in much higher stomatal conductance values compared with those in 2007 (+55%). Under high humidity conditions, leaf specific hydraulic conductance does not constrain stomatal conductance, so the rate of CO2 assimilation was probably at its maximum capacity. This study demonstrated that trees could physiologically interact through root connections, and these interactions should thus be considered in studies of stand dynamics.

The Determination of Sulfur Dioxide-Correction

1917 ◽  
Vol 9 (12) ◽  
pp. 1148-1148
Author(s):  
James Withrow
Keyword(s):  
Sulfur Dioxide
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