Results 311 to 320 of about 660,720 (353)
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Maximum stem diameter predicts liana population demography
Ecology, 2023AbstractDetermining population demographic rates is fundamental to understanding differences in species’ life‐history strategies and their capacity to coexist. Calculating demographic rates, however, is challenging and requires long‐term, large‐scale censuses.
Stefan A. Schnitzer +10 more
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Tree stem diameters fluctuate with tide
Nature, 1998The diameter of tree stems growing under open and controlled conditions undergoes rhythmic fluctuations independent of daily periodic factors such as light, temperature and humidity. We find a strong correlation between these fluctuations and the timing and strength of tides.
E. Zuercher +3 more
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Photo Estimates of Upper Stem Diameters
Journal of Forestry, 1983Abstract With a hand-held 35mm camera mounted with a 200mm lens, a field test was made on 40 white pine trees (Pinus strobus) to evaluate the feasibility of measuring upper stem diameters from photos. A section of the bole was referenced with a scale of known width and photographed with a hand-held camera at a horizontal distance of 10 m
P. Crosby, J. P. Barrett, R. Bocko
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Relationships between Embolism, Stem Water Tension, and Diameter Changes
Journal of Theoretical Biology, 2002A model for embolism in the sapflow process was developed, in which embolism is described as a physical process linked to real physical properties of the conduits and the thermodynamic state of water. Different mechanisms leading to embolism and their effect on water relations and especially diurnal diameter changes in a tree were examined.
T, Hölttä +3 more
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Stem Diameter Estimation from Aerial Photographs
Scandinavian Journal of Forest Research, 2002Remote sensing techniques have proven successful for producing stem maps of forests in leaf-on condition from high-resolution imagery. This paper demonstrates how a mathematical model for the surface of a stem can be used to estimate the breast-height diameter of individual trees from aerial photographs to give information on basal area.
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Stem diameter variations and cold hardiness in walnut trees
Journal of Experimental Botany, 2001The effect of freezing temperatures on stem diameter was measured in the field and in climatic chambers using linear variable differential transformers (LVDT sensors). In acclimated stems, there was reversible stem shrinkage associated with freeze-thaw cycles. The maximum shrinkage correlated with stem diameter (thickness of the bark).
Ameglio, Thierry +2 more
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Interpreting changes in stem diameter in rose plants
Physiologia Plantarum, 1994Sixteen adult rose plants (Rosa hybrida cv. Sweet Promise) were grown in rockwool in a phytotron. Water uptake was estimated by computing the difference between the rate of nutrient solution supply and the rate of leaching, continuously measured using a high‐precision flowmeter. Transpiration was measured using a balance continuously recording the loss
Urban, Laurent +2 more
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A COMPREHENSIVE MODEL FOR SIMULATING STEM DIAMETER FLUCTUATIONS AND RADIAL STEM GROWTH
Acta Horticulturae, 2006In modern horticulture, growers are searching for reliable biosensors and diagnostic tools to evaluate plant eco-physiological behaviour in order to optimize plant growth and crop development. One of these biosensors is the linear variable displacement transducer (LVDT) which accurately measures stem diameter variations. The variations of stem diameter
K. Steppe +3 more
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American Journal of Potato Research, 2005
Field-grown potato plants were sprayed twice weekly, from 21 to 90 days after planting, with 5 or 50 mM hydrogen peroxide (H2O2) solutions. Relative to water-sprayed controls, the H2O2 treatments significantly enhanced tuber starch accumulation by between 6.7% and 30%, as determined by specific gravity or the anthrone spectrophotometric method ...
H. López-Delgado +5 more
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Field-grown potato plants were sprayed twice weekly, from 21 to 90 days after planting, with 5 or 50 mM hydrogen peroxide (H2O2) solutions. Relative to water-sprayed controls, the H2O2 treatments significantly enhanced tuber starch accumulation by between 6.7% and 30%, as determined by specific gravity or the anthrone spectrophotometric method ...
H. López-Delgado +5 more
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Stem Diameter and Electrochemical Measurements
1986This discussion wil1 focus on the measurement of plant stem diameter and apoplast electrochemical status. Emphasis will be directed primarily towards the instrument techniques themselves under field conditions as opposed to the physiological interpretation of the data. For the latter see references 1,3,5,6,7,9,10,11,13,15.
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