Forest Tree Reproduction: Influence of Air Pollutants

1981 ◽  
pp. 141-152
Author(s):  
William H. Smith
Keyword(s):  
Air Pollutants ◽  
Forest Tree ◽  
Tree Reproduction

Forest edge effects on Quercus reproduction within naturally regenerated mixed broadleaf stands

2013 ◽  
Vol 43 (10) ◽  
pp. 911-918 ◽  
Author(s):  
John M. Lhotka ◽  
Jeffrey W. Stringer
Keyword(s):  
Edge Effects ◽  
Radial Growth ◽  
Forest Tree ◽  
Forest Edge ◽  
Reproductive Capacity ◽  
Cross Sectional ◽  
Quercus Spp ◽  
Ring Analysis ◽  
Sectional Analysis ◽  
Tree Reproduction

This paper explores the influence of forest edge on the development of tree reproduction and the use of edge as a silvicultural tool for manipulating regeneration outcomes. Oak (Quercus spp.) reproduction was sampled 9 years following edge establishment along transects extending from 8 m into clearcut openings to 40 m into the adjacent intact forest. Trends showed that oak reproduction height in the intact forest was inversely related to distance from edge up to 20 m into the intact forest. Observed oak reproduction densities were greater within 20 m of edge than in distance intervals further into the intact forest. Tree-ring analysis of 106 seedlings was used to evaluate temporal responses associated with edge development. Cross-sectional analysis indicated a mean age of 13 years, 3 years prior to edge establishment. Increased growth was associated with edge establishment, and 10-year radial growth following edge creation showed a similar spatial pattern as height with oak seedlings within 20 m of the edge exhibiting significantly greater growth than those occurring furthest into the intact forest. This study suggests that forest edge can be used to provide environments useful in building reproductive capacity for species like oaks that require advance reproduction.

Genetic effects of air pollutants in forest tree populations

1990 ◽  
Vol 65 (4) ◽  
pp. 383-384
Author(s):  
P.H. Freer-Smith
Keyword(s):  
Air Pollutants ◽  
Forest Tree ◽  
Genetic Effects

Some Effects of Oxidant Air Pollutants (Ozone and Peroxyacetyl Nitrate) on the Ultrastructure of Leaf Tissues

1972 ◽  
Vol 30 ◽  
pp. 360-361
Author(s):  
William W. Thomson ◽  
Elizabeth S. Swanson
Keyword(s):  
Air Pollutants ◽  
Electron Microscopic Examination ◽  
Peroxyacetyl Nitrate ◽  
Electron Microscopic ◽  
Growth Physiology ◽  
Physiology And Biochemistry ◽  
Entire Plant ◽  
Leaf Tissues ◽  
Gaseous Hydrocarbons ◽  
The Individual

The oxidant air pollutants, ozone and peroxyacetyl nitrate, are produced in the atmosphere through the interaction of light with nitrogen oxides and gaseous hydrocarbons. These oxidants are phytotoxicants and are known to deleteriously affect plant growth, physiology, and biochemistry. In many instances they induce changes which lead to the death of cells, tissues, organs, and frequently the entire plant. The most obvious damage and biochemical changes are generally observed with leaves.Electron microscopic examination of leaves from bean (Phaseolus vulgaris L.) tobacco (Nicotiana tabacum L.) and cotton (Gossipyum hirsutum L.) fumigated for .5 to 2 hours with 0.3 -1 ppm of the individual oxidants revealed that changes in the ultrastructure of the cells occurred in a sequential fashion with time following the fumigation period. Although occasional cells showed severe damage immediately after fumigation, the most obvious change was an enhanced clarity of the cell membranes.

Freeze-dried dispersions for automated SEM analysis of individual submicron airborne particulates

1992 ◽  
Vol 50 (1) ◽  
pp. 408-409
Author(s):  
Karen A. Katrinak ◽  
David W. Brekke ◽  
John P. Hurley
Keyword(s):  
Air Pollutants ◽  
Size Range ◽  
Sem Analysis ◽  
Individual Particle ◽  
Chemical Data ◽  
Particle Analysis ◽  
Bulk Analysis ◽  
Airborne Particulates ◽  
Freeze Dried ◽  
Individual Particle Analysis

Individual-particle analysis is well established as an alternative to bulk analysis of airborne particulates. It yields size and chemical data on a particle-by-particle basis, information that is critical in predicting the behavior of air pollutants. Individual-particle analysis is especially important for particles with diameter < 1 μm, because particles in this size range have a disproportionately large effect on atmospheric visibility and health.

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