By Lisa Emberson, Frank Murray, M. R. Ashmore, Mike Ashmore
Pollution is an issue affecting the whole lot of our planet even though, its international results are poorly understood. This publication presents the 1st really worldwide evaluation of the size of affects of pollution on plants and forests. The center of the publication contains exams of the matter by way of specialists from 12 assorted nations on each continent -- describing the facts of pollution results on crop yields and woodland power with reference to environmental regulations. those analyses are positioned within the context of an international evaluate of the dimensions of present and destiny pollution degrees, in addition to within the socio-economic context of neighborhood construction platforms.
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Extra info for Air Pollution Impacts on Crops & Forests
1993) red spruce forests. Growth decline of high elevation red spruce in s o u t h e r n Appalachian spruce-fir forests began later (1965). Canopy condition at low- a n d high-elevation sites declined d u r i n g 1 9 8 5 - 1 9 8 9 (Peart et al, 1992), while red spruce mortality increased with elevation a n d ranged from 3 - 4 % yr" 1 (Nicholas, 1992). A summary of research on decline of red spruce c o n d u c t e d u n d e r the Spruce-Fir Research Cooperative is available (Eagar a n d Adams, 1992).
In Canada, time series analysis (Dann a n d Summers, 1997) identified a significant declining trend in daily m a x i m u m O3 concentrations ranging from - 0 . 0 5 % to - 0 . 0 8 % yr _ 1 . Average days p e r year ( 1 9 8 6 - 1 9 9 3 ) e x c e e d i n g t h e pre-2000 o n e - h o u r National Ambient Air Quality Objective (NAAQO) ranged from 18 in s o u t h e r n Ontario to 3 in the S o u t h e r n Adantic Region a n d 2 in the Lower Fraser Valley, British Columbia. , particulate matter less than 1 0 | i m diameter (PM 10 ) trends were published for the first time in 1997.
T h e results of eight years of c o o r d i n a t e d work u n d e r the S o u t h e r n Commercial Forest Research Cooperative have b e e n compiled by Fox a n d Mickler (1996). 0 3 is known to significantly increase effects of soil moisture stress on stem growth of loblolly pine (McLaughlin a n d Downing, 1996). Somers et al. (1998) were recently able to correlate visible O3 injury with radial growth of individual yellow-poplar trees in the Great Smokey Mountains National Park, b u t cautioned that this did n o t imply cause-effect.
Air Pollution Impacts on Crops & Forests by Lisa Emberson, Frank Murray, M. R. Ashmore, Mike Ashmore