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.

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.

Growth and development of eastern white pine rooted cuttings compared with seedlings through 8 years of age

1990 ◽  
Vol 20 (3) ◽  
pp. 365-368 ◽  
Author(s):  
Daniel K. Struve ◽  
Steven E. McKeand
Keyword(s):  
Root System ◽  
Stem Cuttings ◽  
System Quality ◽  
White Pine ◽  
Eastern White Pine ◽  
Rooted Cuttings ◽  
The Difference ◽  
Stock Types ◽  
Bare Root

Container-grown rooted stem cuttings from 13 eastern white pine (Pinusstrobus L.) clones were paired with open-pollinated bare-root seedlings to compare growth through age 8 years of the two stock types. Before planting, measures of root system quality (number of roots per cutting, root distribution, and weighted root score) were recorded for each ramet to relate growth to initial root system quality. Rooted cuttings had higher survival than seedlings through year 8, 78 vs. 68%, respectively, but the difference was not statistically significant. Rooted cuttings were significantly shorter than seedlings after age 4 years, with differences between stock types increasing in magnitude through year 8. Measures of root system quality of rooted cuttings were not significantly correlated with survival or growth at any age.

scholarly journals A METHOD FOR ESTIMATING FRACTAL DIMENSION OF TREE CROWNS FROM DIGITAL IMAGES

2007 ◽  
Vol 21 (03) ◽  
pp. 561-572 ◽  
Author(s):  
DONGSHENG ZHANG ◽  
ASHOK SAMAL ◽  
JAMES R. BRANDLE
Keyword(s):  
Fractal Dimension ◽  
Digital Images ◽  
Fractal Dimensions ◽  
Tree Crown ◽  
White Pine ◽  
Eastern White Pine ◽  
Significance Level ◽  
Tree Crowns ◽  
Crown Structure ◽  
The Difference

A new method for estimating fractal dimension of tree crowns from digital images is presented. Three species of trees, Japanese yew (Taxus cuspidata Sieb & Zucc), Hicks yew (Taxus × media), and eastern white pine (Pinus strobus L.), were studied. Fractal dimensions of Japanese yew and Hicks yew range from 2.26 to 2.70. Fractal dimension of eastern white pine range from 2.14 to 2.43. The difference in fractal dimension between Japanese yew and eastern white pine was statistically significant at 0.05 significance level as was the difference in fractal dimension between Hicks yew and eastern white pine. On average, the greater fractal dimensions of Japanese yew and Hicks yew were possibly related to uniform foliage distribution within their tree crowns. Therefore, fractal dimension may be useful for tree crown structure classification and for indexing tree images.

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.

Springtime recovery of photosynthetic activity of white pine in Michigan

1988 ◽  
Vol 66 (1) ◽  
pp. 138-141 ◽  
Author(s):  
Thomas W. Jurik ◽  
George M. Briggs ◽  
David M. Gates
Keyword(s):  
Soil Temperature ◽  
Air Temperature ◽  
Photosynthetic Rate ◽  
Photosynthetic Activity ◽  
Pinus Strobus ◽  
White Pine ◽  
Eastern White Pine ◽  
Endogenous Factors ◽  
Air Temperatures ◽  
Highly Correlated

The CO2 exchange of a field-grown eastern white pine (Pinus strobus L.) in Michigan was monitored during the winter–spring periods of 1983 and 1985. Its light-saturated photosynthetic rate in ambient CO2 and temperature was depressed during the winter, but recovered very rapidly during the last week of April in both years. The depressed rates in the winter were not due solely to low air temperatures, since the rates remained low even on warmer days or when the air temperature was artificially increased. Photosynthetic activity was more highly correlated with soil temperature at 30 cm than with air temperature or soil temperature at shallower depths. However, photoperiod or endogenous factors could not be eliminated as potential controls on photosynthetic activity.

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