Interactive effects of ambient ozone and climate measured on growth of mature forest trees

Nature ◽  
1995 ◽  
Vol 374 (6519) ◽  
pp. 252-254 ◽  
Author(s):  
S. B. McLaughlin ◽  
D. J. Downing
Keyword(s):  
Interactive Effects ◽  
Forest Trees ◽  
Ambient Ozone ◽  
Mature Forest

scholarly journals Interactive effects of ambient ozone and climate measured on growth of mature loblolly pine trees

1996 ◽  
Vol 26 (4) ◽  
pp. 670-681 ◽  
Author(s):  
S.B. McLaughlin ◽  
D.J. Downing
Keyword(s):  
Soil Moisture ◽  
Loblolly Pine ◽  
Moisture Stress ◽  
Growth Patterns ◽  
Forest Growth ◽  
Interactive Effects ◽  
Forest Trees ◽  
Short Term ◽  
Data Set ◽  
Ambient Ozone

Seasonal growth patterns of mature loblolly pine (Pinustaeda L.) trees over the interval 1988–1993 have been analyzed to evaluate the effects of ambient ozone on growth of large forest trees. Patterns of stem expansion and contraction of 34 trees were examined using serial measurements with sensitive dendrometer band systems. Study sites, located in eastern Tennessee, varied significantly in soil moisture, soil fertility, and stand density. Levels of ozone, rainfall, and temperature varied widely over the 6-year study interval. Regression analysis identified statistically significant influences of ozone on stem growth patterns, with responses differing widely among trees and across years. Ozone interacted with both soil moisture stress and high temperatures, explaining 63% of the high frequency, climatic variance in stem expansion identified by stepwise regression of the 5-year data set. Observed responses to ozone were rapid, typically occurring within 1–3 days of exposure to ozone at ≥40 ppb and were significantly amplified by low soil moisture and high air temperatures. Both short-term responses, apparently tied to ozone-induced increases in whole-tree water stress, and longer term cumulative responses were identified. These data indicate that relatively low levels of ambient ozone can significantly reduce growth of mature forest trees and that interactions between ambient ozone and climate are likely to be important modifiers of future forest growth and function. Additional studies of mechanisms of short-term response and interspecies comparisons are clearly needed.

scholarly journals Rapid mixing between old and new C pools in the canopy of mature forest trees

2007 ◽  
Vol 30 (8) ◽  
pp. 963-972 ◽  
Author(s):  
SONJA G. KEEL ◽  
ROLF T.W. SIEGWOLF ◽  
MAYA JÄGGI ◽  
CHRISTIAN KÖRNER
Keyword(s):  
Forest Trees ◽  
Rapid Mixing ◽  
Mature Forest ◽  
C Pools

scholarly journals Interactive effects of drought and pathogens in forest trees

2006 ◽  
Vol 63 (6) ◽  
pp. 597-612 ◽  
Author(s):  
Marie-Laure Desprez-Loustau ◽  
Benoit Marçais ◽  
Louis-Michel Nageleisen ◽  
Dominique Piou ◽  
Andrea Vannini
Keyword(s):  
Interactive Effects ◽  
Forest Trees ◽  
Effects Of Drought

scholarly journals Ambient ozone effects on forest trees of the eastern United States: a review

1998 ◽  
Vol 139 (1) ◽  
pp. 91-108 ◽  
Author(s):  
ARTHUR H. CHAPPELKA ◽  
LISA J. SAMUELSON
Keyword(s):  
United States ◽  
Forest Trees ◽  
Eastern United States ◽  
Ambient Ozone

Modelling the responses of mature forest trees to air pollution

GeoJournal ◽  
1988 ◽  
Vol 17 (2) ◽  
pp. 279-287 ◽  
Author(s):  
Heiner Schäfer ◽  
Hartmut Bossel ◽  
Holger Krieger ◽  
Norbert Trost
Keyword(s):  
Air Pollution ◽  
Forest Trees ◽  
Mature Forest

Investigation of the Effect of Mode and Tempo on Emotional Responses to Music Using EEG Power Asymmetry

2013 ◽  
Vol 27 (3) ◽  
pp. 142-148 ◽  
Author(s):  
Konstantinos Trochidis ◽  
Emmanuel Bigand
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Emotional Responses ◽  
Interactive Effects ◽  
Eeg Activity ◽  
Musical Excerpt ◽  
Major Mode ◽  
Musical Modes ◽  
Slow Tempo ◽  
The Right

The combined interactions of mode and tempo on emotional responses to music were investigated using both self-reports and electroencephalogram (EEG) activity. A musical excerpt was performed in three different modes and tempi. Participants rated the emotional content of the resulting nine stimuli and their EEG activity was recorded. Musical modes influence the valence of emotion with major mode being evaluated happier and more serene, than minor and locrian modes. In EEG frontal activity, major mode was associated with an increased alpha activation in the left hemisphere compared to minor and locrian modes, which, in turn, induced increased activation in the right hemisphere. The tempo modulates the arousal value of emotion with faster tempi associated with stronger feeling of happiness and anger and this effect is associated in EEG with an increase of frontal activation in the left hemisphere. By contrast, slow tempo induced decreased frontal activation in the left hemisphere. Some interactive effects were found between mode and tempo: An increase of tempo modulated the emotion differently depending on the mode of the piece.

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