Response of Selected Pinusstrobus L. Clones to Fumigations with Sulfur Dioxide and Ozone

1974 ◽  
Vol 4 (1) ◽  
pp. 65-68 ◽  
Author(s):  
Daniel B. Houston
Keyword(s):  
Sulfur Dioxide ◽  
Field Observations ◽  
Ambient Conditions ◽  
White Pine ◽  
Eastern White Pine ◽  
Sensitive Clone ◽  
Low Concentrations ◽  
Two Indices ◽  
Consistent Response ◽  
Tolerant Clones

Response of eastern white pine (Pinusstrobus L.) to ozone (O3) and sulfur dioxide (SO2) was studied utilizing controlled fumigation chambers in the greenhouse. Tolerant and sensitive clones were fumigated for 6 h at concentrations of 5, 10, 30, and 60 parts per hundred million (p.p.h.m.) O3, 2.5, 5, 15, and 45 p.p.h.m. SO2, and 2.5 p.p.h.m. SO2 plus 5 p.p.h.m. O3 in combination. Response was judged by needle elongation and two indices of direct needle damage.Ozone exposures did not produce a consistent response among tolerant and sensitive classes, while injury caused by SO2 and SO2 plus O3 correlated well with field observations of damage under ambient conditions. The most sensitive clone was injured by concentrations of SO2 as low as 2.5 ± 1 p.p.h.m. Sixty percent of the tolerant clones were injured by 5 and 15 p.p.h.m. SO2, and all tolerant material was injured at 45 p.p.h.m. SO2. The interaction of SO2 and O3 at low concentrations was established as more serious than that caused by either pollutant alone at similar levels.

Photosynthesis and needle elongation response of Pinusstrobus clones to low level sulfur dioxide exposures

1980 ◽  
Vol 10 (3) ◽  
pp. 357-361 ◽  
Author(s):  
Robert T. Eckert ◽  
Daniel B. Houston
Keyword(s):  
Regression Analysis ◽  
Sulfur Dioxide ◽  
Photosynthetic Rate ◽  
White Pine ◽  
Eastern White Pine ◽  
Low Level ◽  
The Difference ◽  
Tolerant Clones

Sensitive and tolerant eastern white pine (Pinusstrobus L.) clones were exposed to 5.0 ± 0.5 pphm SO2 for 2 h. At the end of the fumigation, the average apparent photosynthetic rate was depressed by 27% in sensitive clones and by 10% in tolerant clones. Regression analysis of rate of reduction in photosynthesis over the 2 h was significant (0.05 level) for both classes, as was the difference (0.01 level) between the levels of the two regressions. Differences in final needle lengths of fumigated tolerant and sensitive clones were not significant.

The Differential Sensitivity of Eastern White Pine to Three Types of Air Pollution

1973 ◽  
Vol 3 (4) ◽  
pp. 543-547 ◽  
Author(s):  
Charles R. Berry
Keyword(s):  
Air Pollution ◽  
Power Plant ◽  
Sulfur Dioxide ◽  
Field Conditions ◽  
Differential Sensitivity ◽  
Vehicular Traffic ◽  
White Pine ◽  
Eastern White Pine ◽  
Fertilizer Plant ◽  
Resistant Lines

The possibility of selecting clones of eastern white pine (Pinusstrobus L.) with specific sensitivities to different air pollution regimes was investigated. Field screening was carried out by exposing potted seedlings to field conditions for 1 year or longer in each of three areas where a particular phytotoxicant was known to predominate. The areas were characterized by the following pollution sources and major phytotoxicants: (1) power plant, sulfur dioxide; (2) fertilizer plant, fluorides; and (3) vehicular traffic, oxidants. Selections were made of: (1) trees injured during only one season in one area; (2) trees injured during both the summer and winter, but only in one area; (3) trees resistant to air pollution in all three areas; and (4) trees sensitive to air pollution in all three areas. These selections are being propagated for use as specifically sensitive bioindicators of air pollution and as resistant lines for use in seed orchards of white pine.

Roost-site selection and roosting ecology of forest-dwelling bats in southern British Columbia

1996 ◽  
Vol 74 (10) ◽  
pp. 1797-1805 ◽  
Author(s):  
Maarten J. Vonhof ◽  
Robert M. R. Barclay
Keyword(s):  
British Columbia ◽  
Ponderosa Pine ◽  
Tree Height ◽  
Canopy Closure ◽  
Ambient Conditions ◽  
White Pine ◽  
Roosting Ecology ◽  
Site Preferences ◽  
Roost Trees ◽  
Lasionycteris Noctivagans

We used radiotelemetry to examine the roost-site preferences of four species of tree-roosting bats (Eptesicus fuscus, Lasionycteris noctivagans, Myotis evotis, and M. volans) in southern British Columbia, Canada, by radio-tracking bats to their day roosts. We found a total of 21 roost trees: 14 roosts were beneath loose bark, 5 were in cavities excavated by woodpeckers, and 2 were in natural cavities. Entrance height increased with tree height, but roost entrances tended to be situated below the level of the canopy. Of the 22 tree and site variables examined, only 3 significantly discriminated between roost trees and available trees: tree height, distance to the nearest available tree, and percent canopy closure. Bats preferred tall trees associated with low percent canopy closure and a short distance to the nearest available tree. Bats roosted in western white pine, and to a lesser extent ponderosa pine and western larch, in intermediate stages of decay more often than would be expected at random. Bats switched roosts frequently. The distance between subsequent roost trees was short, suggesting a degree of fidelity to a particular group of trees or area of forest. The number of days of rain during the roosting period significantly influenced the number of days spent in a particular roost, and thus ambient conditions may restrict the frequency with which bats can switch roosts.

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