Equations for estimating loblolly pine branch and foliage weight and surface area distributions

1997 ◽  
Vol 27 (6) ◽  
pp. 918-927 ◽  
Author(s):  
V C Baldwin, Jr. ◽  
K D Peterson ◽  
H E Burkhart ◽  
R L Amateis ◽  
P M Dougherty
Keyword(s):  
Surface Area ◽  
Loblolly Pine ◽  
Foliage Weight

Erratum: Equations for estimating loblolly pine branch and foliage weight and surface area distributions

1998 ◽  
Vol 28 (7) ◽  
pp. 1097 ◽  
Author(s):  
V Clark Baldwin, Jr. ◽  
Kelly D Peterson ◽  
Harold E Burkhart ◽  
Ralph L Amateis ◽  
Phillip M Dougherty
Keyword(s):  
Surface Area ◽  
Loblolly Pine ◽  
Foliage Weight

Coniferous Stands Characterized with The Weibull Distribution

1974 ◽  
Vol 4 (4) ◽  
pp. 518-523 ◽  
Author(s):  
Hans T. Schreuder ◽  
Wayne T. Swank
Keyword(s):  
Weibull Distribution ◽  
Surface Area ◽  
Loblolly Pine ◽  
Basal Area ◽  
Pine Plantations ◽  
Distribution Data ◽  
Gamma Distributions ◽  
Profile Distribution ◽  
Parameter Values ◽  
Over Time

The Weibull distribution, [Formula: see text], summarized diameter, basal area, surface area, biomass, and crown profile distribution data well for several different ages of white and loblolly pine plantations. The data for diameter, basal area, surface area, and biomass were easily summarized by this one distribution in a theoretically consistent fashion. This is not possible with the normal and the gamma distributions, and the lognormal gives less satisfactory results. The distribution function should prove useful in modeling tree stands since only the parameter values need to be changed over time for the above variables. The change in these parameters may be a good way to characterize and interpret changes in stands over time.

Relationships Between Plant Surface Area and Respiration in Loblolly Pine

1975 ◽  
Vol 12 (3) ◽  
pp. 965 ◽  
Author(s):  
R. S. Kinerson
Keyword(s):  
Surface Area ◽  
Loblolly Pine ◽  
Plant Surface

Variation in the amount of foliage on woody shoots and its effects on water relations parameters derived from pressure–volume curves

1986 ◽  
Vol 16 (2) ◽  
pp. 239-243 ◽  
Author(s):  
Howard S. Neufeld ◽  
Robert O. Teskey
Keyword(s):  
Water Content ◽  
Water Relations ◽  
Loblolly Pine ◽  
Woody Plant ◽  
Parameter Estimates ◽  
Relative Water ◽  
Degree Of Confidence ◽  
The Mean ◽  
Foliage Weight ◽  
Water Contents

The interpretation of pressure–volume curves for woody plant material is complicated by the use of foliated twigs to derive estimates of the water relations parameters of just the foliage. In this study, the ratio of foliage to twig water in shoots of loblolly pine (Pinustaeda) was varied systematically by defoliating twigs to varying degrees prior to constructing pressure–volume curves. Results show that variation in the ratio of foliage to twig water can influence interpretation of the curves. Reducing the amount of foliage causes decreases in the estimates of apoplasmic water content. Estimates of osmotic potential at full turgor and water potential at turgor loss were less affected. When foliated and fully defoliated twigs were compared, foliated twigs had lower water potentials at the same relative water contents. This may partially explain some of the differences in the parameter estimates among the treatments. If care is taken to avoid large differences in relative foliage weight, twigs can be used to estimate water relations characteristics of the foliage. For loblolly pine though, estimates of apoplasmic water content in twigs will be lower than in single fascicles. If single fascicles are used, more samples will have to be taken to obtain the same degree of confidence about the mean as for twigs, since the coefficient of variation is higher.

Effects of ozone and simulated acidic precipitation on above- and below-ground growth of loblolly pine (Pinustaeda)

1992 ◽  
Vol 22 (4) ◽  
pp. 582-587 ◽  
Author(s):  
Z. Qiu ◽  
A.H. Chappelka ◽  
G.L. Somers ◽  
B.G. Lockaby ◽  
R.S. Meldahl
Keyword(s):  
Surface Area ◽  
Loblolly Pine ◽  
Ozone Concentration ◽  
Final Height ◽  
Root Surface ◽  
Root Surface Area ◽  
Ph Effects ◽  
Acidic Precipitation ◽  
Ozone Concentrations ◽  
Ozone Sensitivity

Loblolly pine (Pinustaeda L.) seedlings from two families differing in ozone sensitivity were exposed to four ozone concentrations (charcoal-filtered (subambient ozone concentration), nonfiltered (ambient ozone concentration), non-filtered × 1.7, and nonfiltered × 2.5) and three levels of acidic precipitation (pH = 3.3, 4.3, and 5.3) in modified open-top chambers for one growing season at Auburn, Alabama. Seedlings were planted in the ground in root-exclusion tubes that isolated root systems of individual seedlings. Foliage, stem, and root biomass, three-dimensional root surface area (root surface area × π; in cm3), final height, and groundline diameter were recorded and analyzed. Foliage dry matter and root surface area decreased and root to shoot ratio significantly increased with increasing ozone concentrations for the ozone-sensitive family. There were no significant pH effects for this family. No significant differences in either ozone or pH treatments occurred for the ozone-tolerant family. The possible implications on long-term effects of ozone and acidic precipitation on loblolly pine growth are discussed.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Cell morphology, volume, and surface area determinations from multilevel contouring within HVEM micrographs of serial sections and whole-cell mounts

1987 ◽  
Vol 45 ◽  
pp. 588-589
Author(s):  
M. Marko ◽  
A. Leith ◽  
D. Parsons
Keyword(s):  
Surface Area ◽  
Electron Micrographs ◽  
Cell Morphology ◽  
Individual Variation ◽  
Serial Section ◽  
Stereo Pair ◽  
Complex Structures ◽  
Serial Sections ◽  
Surface Areas ◽  
Computer Based

The use of serial sections and computer-based 3-D reconstruction techniques affords an opportunity not only to visualize the shape and distribution of the structures being studied, but also to determine their volumes and surface areas. Up until now, this has been done using serial ultrathin sections.The serial-section approach differs from the stereo logical methods of Weibel in that it is based on the Information from a set of single, complete cells (or organelles) rather than on a random 2-dimensional sampling of a population of cells. Because of this, it can more easily provide absolute values of volume and surface area, especially for highly-complex structures. It also allows study of individual variation among the cells, and study of structures which occur only infrequently.We have developed a system for 3-D reconstruction of objects from stereo-pair electron micrographs of thick specimens.

Risk Factors for Bleeding during Treatment of Acute Venous Thromboembolism

1996 ◽  
Vol 76 (05) ◽  
pp. 682-688 ◽  
Author(s):  
Jos P J Wester ◽  
Harold W de Valk ◽  
Karel H Nieuwenhuis ◽  
Catherine B Brouwer ◽  
Yolanda van der Graaf ◽  
...  
Keyword(s):  
Risk Factors ◽  
Venous Thromboembolism ◽  
Surface Area ◽  
Body Surface Area ◽  
Body Surface ◽  
Small Body ◽  
Bleeding Risk ◽  
Risk Scores ◽  
Risk Of Bleeding ◽  
Acute Venous Thromboembolism

Summary Objective: Identification of risk factors for bleeding and prospective evaluation of two bleeding risk scores in the treatment of acute venous thromboembolism. Design: Secondary analysis of a prospective, randomized, assessor-blind, multicenter clinical trial. Setting: One university and 2 regional teaching hospitals. Patients: 188 patients treated with heparin or danaparoid for acute venous thromboembolism. Measurements: The presenting clinical features, the doses of the drugs, and the anticoagulant responses were analyzed using univariate and multivariate logistic regression analysis in order to evaluate prognostic factors for bleeding. In addition, the recently developed Utrecht bleeding risk score and Landefeld bleeding risk index were evaluated prospectively. Results: Major bleeding occurred in 4 patients (2.1%) and minor bleeding in 101 patients (53.7%). For all (major and minor combined) bleeding, body surface area ≤2 m2 (odds ratio 2.3, 95% Cl 1.2-4.4; p = 0.01), and malignancy (odds ratio 2.4, 95% Cl 1.1-4.9; p = 0.02) were confirmed to be independent risk factors. An increased treatment-related risk of bleeding was observed in patients treated with high doses of heparin, independent of the concomitant activated partial thromboplastin time ratios. Both bleeding risk scores had low diagnostic value for bleeding in this sample of mainly minor bleeders. Conclusions: A small body surface area and malignancy were associated with a higher frequency of bleeding. The bleeding risk scores merely offer the clinician a general estimation of the risk of bleeding. In patients with a small body surface area or in patients with malignancy, it may be of interest to study whether limited dose reduction of the anticoagulant drug may cause less bleeding without affecting efficacy.

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