ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

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Gas exchange and canopy structure of 9-year-old loblolly pine, pitch pine and pitch x loblolly hybrids (1992)

Samuelson, Lisa J. ; Seiler, John R. ; Feret, Peter P.

Springer

Trees 6 (1992), S. 28-31

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ISSN: 1432-2285

Keywords: Canopy leaf surface area ; Gas exchange ; Pinus rigida x taeda ; Silhouette area ratio

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Summary Seasonal gas exchange and canopy structure were compared among 9-year-old loblolly pine (Pinus taeda L.), pitch pine (Pinus rigida Mill.), and pitch x loblolly hybrids (Pinus rigida x taeda) growing in an F2 plantation located in Critz, Va., USA. Leaf net photosynthesis, conductance, internal CO2 concentration (ci), water use efficiency (WUE; photosynthesis/conductance), dark respiration and the ratio of net photosynthesis/respiration did not vary among or within the three taxa. Significant differences in volume production, crown length, total crown leaf surface area and the silhouette area of shade shoots among the taxa were observed. The loblolly-South Carolina source had greater volume and crown surface area than the pitch pine, and the hybrid taxa were intermediate between the two. Although the silhouette area ratio of shade foliage varied among taxa, it was not related to volume. A strong relationship between total leaf surface area and volume was observed. Leaf conductance, ci, WUE and leaf water potential were the physiological parameters significantly and positively correlated with volume. This study suggests that the amount of needle surface in the canopy is more important in early stand volume growth than the leaf carbon exchange rate and the degree of needle self-shading in the lower canopy.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00224495

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2

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The effects of sulfometuron on the root growth of loblolly pine (1989)

Barnes, Andrew D. ; Zedaker, Shepard M. ; Feret, Peter P. ; [et al.]

Springer

New forests 3 (1989), S. 289-295

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ISSN: 1573-5095

Keywords: Pinus taeda ; Oust™ ; herbaceous weed control

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract The effect of sulfometuron (Oust™) on the root growth of loblolly pine (Pinus taeda L.) seedlings was studied in the field and in two soil types in the greenhouse. In the greenhouse study sulfometuron was applied to the foliage only, the soil only, and to both foliage and soil at the rates of 0.10, 0.21, and 0.42 kg ai/ha. Twenty-eight days after application root growth significantly decreased for all methods of application and with increasing rates e.g., 0.10, 0.21, and 0.42 kg ai/ha sulfometuron reduced new root length by 42%, 53%, and 64%, respectively. Application in the field at the rate of 0.30 kg ai/ha resulted in a 68% reduction in root growth. However, by the end of the growing season treated seedling root and shoot biomass were 115% and 64% greater, respectively. To ensure earlier season survival the rate of sulfometuron applied should be kept at a minimum level that will allow both weed control and adequate root growth. Low rates would be particularly important during a dry planting season.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00030038

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3

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Root regeneration as an indicator of aluminium toxicity in loblolly pine (1987)

Paganelli, David J. ; Seiler, John R. ; Feret, Peter P.

Springer

Plant and soil 102 (1987), S. 115-118

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ISSN: 1573-5036

Keywords: aluminum tolerance ; Pinus taeda ; root regeneration potential

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract Loblolly pine (Pinus taeda L.) seedlings were grown in sand culture and exposed to solution Al concentrations of 0, 5, 10, 20, 40, and 80 mg.l−1 in two separate studies. Root regeneration potential (RRP) of loblolly pine was found to be very sensitive to Al. Both the total number and total length of new white roots produced during a 24-day period declined with as little as 5 mg Al.l−1 in solution.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02370909

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4

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Growth and water potential of j-rooted loblolly and eastern white pine seedlings over three growing seasons (1990)

Seiler, John R. ; Paganelli, David J. ; Cazell, Ben H.

Springer

New forests 4 (1990), S. 147-153

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ISSN: 1573-5095

Keywords: moisture stress ; Pinus taeda ; Pinus strobus ; root deformation

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract The effects of j-rooting on water stress and growth of loblolly (Pious taeda L.) and eastern white pine (Pious strobus L.) were examined over three growing seasons in the field. Seedlings were planted in an area with severe herbaceous competition with either their roots planted straight or bent into a j shape. All seedlings were planted with their root collars placed at the soil surface. During the first year j-rooted seedlings consistently had lower water potentials but never statistically significant. Since both treatments were planted with the root collar at the soil surface, this trend was likely due to an initial shallower root system in j-rooted seedlings. In year three no differences in water potential were significant and no trends were evident. Growth did not differ significantly by treatment at any time but, by year three, j-rooted plants were consistently larger for both species.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00119007

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5

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Comparison of greenhouse and environmentally controlled growthroom root growth potential testing of 2+0 eastern white pine seedlings (1988)

Johnsen, Kurt H. ; Feret, Peter P. ; Seiler, John R.

Springer

New forests 2 (1988), S. 139-143

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ISSN: 1573-5095

Keywords: Pinus strobus ; growthroom ; greenhouse

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract Two-year-old estern white pine (Pinus strobus L.) seedlings were measured for Root Growth Potential (RGP) in a hydroponic system over two years in both a greenhouse and an environmentally controlled growthroom. Analyses of variance showed no significant differences (alpha = 0.05) between testing environments for either year. This study demonstrates the validity of using greenhouse RGP testing for 2+0 eastern white pine.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00027765

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6

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Growth and gas exchange of loblolly pine seedlings as influenced by drought and air pollutants (1990)

Lee, Woong S. ; Chevone, Boris I. ; Seiler, John R.

Springer

Water, air & soil pollution 51 (1990), S. 105-116

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ISSN: 1573-2932

Source: Springer Online Journal Archives 1860-2000

Topics: Energy, Environment Protection, Nuclear Power Engineering

Notes: Abstract One-year-old loblolly pine seedlings were exposed to 03(≤0.025 or 0.10 μ L L−1, 4 hr d−1, 3 d wk−1) in combination with simulated rain (pH 5.6 or 3.0, 1 hr d−1, 2 d wk−1, 0.75 cm hr−1) for 10 wk. After the 10-wk treatment, the seedlings were submitted to two drought cycles, and water potential, net photosynthesis (Pn), and transpiration (Tr) were measured. Whole-plant fresh weight increment and relative growth rate were significantly increased in seedlings exposed to simulated rain at pH 3.0 compared to pH 5.6. An interaction between 03 and simulated rain occurred in height growth. Shoot height elongation was significantly less in seedlings exposed to 0.10 μL L−1 03 + pH 5.6 than in any other pollutant combination after the 10-wk treatment period. There were no significant effects of 03 on Pn and Tr prior to the drought cycles; however, after the first drought cycle, Pn was significantly higher in seedlings pre-exposed to 0.10 μL L−1 03 compared to the low 03 concentration. The 10-wk treatment with simulated rain at pH 3.0 significantly increased Pn and Tr. The relationship between gas exchange rates and needle water potential during the moisture stress period was affected by preexposure to pollutants. In general, Pn and Tr were more sensitive to decreasing needle water potential in seedlings exposed to pH 3.0 during the first drought cycle and to 0.10 μL L−1 03 during second drought cycle.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00211508

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Elevated atmospheric CO2 and species mixture alter N acquisition of trees in stand microcosms (2000)

Friend, Alexander L ; Jifon, John L ; Berrang, Paul C ; [et al.]

Canadian Science Publishing

In: Canadian Journal of Forest Research. 2000; 30(5): 827-836. Published 2000 May 01. doi: 10.1139/x00-019.

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Publication Date: 2000-05-01

Description: The potential for elevated atmospheric CO2 to increase forest growth depends on how it affects plant acquisition of soil nitrogen (N) in realistic competitive settings. We grew seedling microcosms in large (0.6-m2) boxes of forest soil placed outdoors in CO2-controlled open-top chambers. Loblolly pine (Pinus taeda L.) and sweetgum (Liquidambar styraciflua L.) were grown as single-species stands (monocultures) and as 50:50 pine:sweetgum mixtures, with a factorial combination of CO2 (ambient, twice ambient) and soil water (dry, moist) for two growing seasons. We added N, enriched with 15N, 2 months after planting and used N and 15N content of microcosm components to evaluate treatment effects. Under ambient CO2, species mixture decreased biomass and N accumulation of pine compared with pine in monoculture. Elevated CO2 partially to fully ameliorated this negative effect of species mixture for pine by increasing its biomass and N accumulation irrespective of competitive setting. Sweetgum biomass and N accumulation were improved in mixed culture (compared with monoculture) under moist conditions. However, only sweetgum biomass (not N) responded positively to increasing CO2. Our study suggests that increasing atmospheric CO2 concentration may provide a competitive advantage to pine growing in mixture with sweetgum in low fertility forest soils.

Print ISSN: 0045-5067

Electronic ISSN: 1208-6037

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Published by Canadian Science Publishing

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Growth and acetylene reduction of black alder seedlings in response to water stress (1984)

Seiler, John R. ; Johnson, Jon D.

Canadian Science Publishing

In: Canadian Journal of Forest Research. 1984; 14(4): 477-480. Published 1984 Aug 01. doi: 10.1139/x84-089.

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Publication Date: 1984-08-01

Description: Black alder, Alnusglutinosa (L.) Gaertn., seedlings were grown and kept well watered for 10 weeks, and then subjected to moisture stress conditioning for 5 subsequent weeks, where one-half of the seedlings were watered only when visibly wilted. The remaining seedlings (controls) were kept well watered. Moisture stress conditioning greatly reduced shoot, root, nodule, and total plant dry weight. The root–shoot ratio (grams/grams) of seedlings was significantly increased from 0.28 in the control seedlings to 0.33 in the water-stressed treatment. Acetylene reduction rates decreased only slightly in the range of water potentials between −0.50 and −1.29 MPa, then dropped rapidly below water potentials of −1.30 MPa. Moisture stress conditioning had no significant influence on this response. Although not significantly different, leaf and nodule osmotic potentials were consistently lower in the water-stressed plants.

Print ISSN: 0045-5067

Electronic ISSN: 1208-6037

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition