Changes in leaf expansion and epidermal screening effectiveness in Liquidambar styraciflua and Pinus taeda in response to UV-B radiation

2008 ◽  
Vol 98 (2) ◽  
pp. 349-357 ◽  
Author(s):  
Joe H. Sullivan ◽  
Bradley W. Howells ◽  
Christopher T. Ruhland ◽  
Thomas A. Day
Keyword(s):  
Pinus Taeda ◽  
Leaf Expansion ◽  
Liquidambar Styraciflua ◽  
Screening Effectiveness

Diffusion of sulfide into Southern pine (Pinus taeda L.) and sweetgum (Liquidambar styraciflua L.) particles and chips

Holzforschung ◽  
2006 ◽  
Vol 60 (5) ◽  
pp. 498-502 ◽  
Author(s):  
Aaron J. Jacobson ◽  
Gregory D. Smith ◽  
Rallming Yang ◽  
Sujit Banerjee
Keyword(s):  
Pinus Taeda ◽  
Liquidambar Styraciflua ◽  
Wood Structure ◽  
Southern Pine ◽  
White Liquor ◽  
Dilution Water ◽  
Pinus Taeda L ◽  
Reversible Phase ◽  
Reversible Component

Abstract Sulfide diffusion into wood has a rapid reversible component and a much slower irreversible component. During the initial reversible phase, sulfide is unable to diffuse into parts of the wood structure, probably because of charge exclusion. The diffusion of hydroxide and sulfide into saturated wood was imaged by immersing chips in white liquor, splitting them open and then imaging the hydroxide and sulfide profiles. Sulfide moves into the interior of the chip at a faster rate than hydroxide does because it is prevented from entering some of the pores and must move deeper into the chip to access dilution water.

Effects of CO2 enrichment and water stress on growth of Liquidambar styraciflua and Pinus taeda seedlings

1984 ◽  
Vol 62 (10) ◽  
pp. 2135-2139 ◽  
Author(s):  
Leslie C. Tolley ◽  
B. R. Strain
Keyword(s):  
Water Stress ◽  
Pinus Taeda ◽  
Loblolly Pine ◽  
Recovery Period ◽  
Co2 Enrichment ◽  
Interactive Effects ◽  
Liquidambar Styraciflua ◽  
Photon Flux ◽  
Photon Flux Density ◽  
Pine Seedlings

Mathematical growth analysis techniques were used to assess the possible interactive effects of atmospheric carbon dioxide enrichment and water stress on growth and biomass partitioning of Liquidambar styraciflua L. (sweetgum) and Pinus taeda L. (loblolly pine) seedlings. Plants were grown from seed under 1000 μmol∙m−2∙s−1 photosynthetic photon flux density at CO2 concentrations of 350, 675, and 1000 μL∙L−1 for 56 days. At this time, half the seedlings in each CO2 treatment had water withheld until plant water potentials reached about −2.5 MPa in the most stressed plants, while the remaining plants were well watered. At the end of the drying cycle, stressed plants were returned to well-watered conditions for a 14-day recovery period. The greatest effects of water stress on growth were seen following the recovery period and were most severe for sweetgum seedlings grown at the lowest CO2 concentration. For sweetgum seedlings in particular, the reduction of early seedling growth following exposure to a period of drought under normal atmospheric CO2 concentration was ameliorated by growing plants under elevated CO2, primarily because of maintenance of greater net assimilation rates following a period of stress. The data presented here suggest that a doubling of atmospheric CO2 concentration would enable sweetgum seedlings to become established in drier sites which are currently dominated by loblolly pine seedlings.

Cultural Treatments Affect Growth, Volume, and Survival of Sweetgum, Sycamore, and Loblolly Pine

1978 ◽  
Vol 2 (2) ◽  
pp. 55-59 ◽  
Author(s):  
Ron Hunt ◽  
Glenn Cleveland
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Liquidambar Styraciflua ◽  
Volume Index ◽  
Fusiform Rust ◽  
Platanus Occidentalis ◽  
Care Treatment ◽  
Height Increase ◽  
Pinus Taeda L ◽  
Heavy Mortality

Abstract At age five, disk cultivation between trees, the maximum-care treatment, produced a statistically significant height increase for sycamore (Platanus occidentalis L.), sweetgum (Liquidambar styraciflua L.), and loblolly pine (Pinus taeda L.) as compared to trees grown on minimum-care (shear and burn) plots. Volume index (dbh² x height) of loblolly pine was significantly larger with cultivation than with the minimum treatment. Fusiform rust incidence (Cronartium fusiforme Hedgc and Hunt ex Cumm.) on loblolly pine was 1.5 to 3.0 times greater on maximumcare plots than on minimum-care plots. The hardwoods on less than the maximum-care plots experienced heavy mortality and very little growth.

Ammonium Nitrate and Phosphoric Acid Increase 2,4,5-T Absorption by Tree Leaves

Weed Science ◽  
1970 ◽  
Vol 18 (2) ◽  
pp. 204-206 ◽  
Author(s):  
Homer A. Brady
Keyword(s):  
Phosphoric Acid ◽  
Ammonium Nitrate ◽  
Pinus Taeda ◽  
Loblolly Pine ◽  
Acer Rubrum ◽  
Liquidambar Styraciflua ◽  
Red Maple ◽  
Tree Leaves ◽  
Post Oak ◽  
Quercus Stellata

Addition of ammonium nitrate greatly increased the absorption of solutions of the isooctyl ester of (2,4,5-trichlorophenoxy)acetic acid (2,4,5-T) by sweetgum (Liquidambar styraciflua L.), post oak (Quercus stellata Wangenh.), red maple (Acer rubrum L.), and loblolly pine (Pinus taeda L.) leaves. Phosphoric acid alone and mixed with ammonium nitrate caused less increase. Ammonium nitrate speeded translocation of the herbicide in post oak but not in the other species.

Spray Date Effects on Behavior of Herbicides on Brush

Weed Science ◽  
1971 ◽  
Vol 19 (3) ◽  
pp. 200-202 ◽  
Author(s):  
Homer A. Brady
Keyword(s):  
Pinus Taeda ◽  
Loblolly Pine ◽  
Growing Season ◽  
Liquidambar Styraciflua ◽  
Fraxinus Pennsylvanica ◽  
Green Ash ◽  
Hardwood Species ◽  
Anisic Acid ◽  
Quercus Nigra ◽  
Water Oak

Dicamba (3,6-dichloro-o-anisic acid), 1,1′-dimethyl-4,4′-dipyridinium ion (paraquat), and (2,4,5-trichlorophenoxy)-acetic acid (2,4,5-T) were applied as foliar sprays to 4-year-old sweetgum (Liquidambar styraciflua L.), green ash (Fraxinus pennsylvanica Marsh.), water oak (Quercus nigra L.), and loblolly pine (Pinus taeda L.). For the three hardwood species the amount of herbicide absorbed and translocated, as measured 4 days after application, was correlated closely with tops killed 1 year later. Applications in May were more effective than those made later in the growing season. Loblolly pine was defoliated by all herbicides but recovered the second season after spraying.

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