scholarly journals Diameter and height growth analysis for individual White Pine trees in the area of Kostelec nad Černými lesy 

2012 ◽  
Vol 49 (No. 12) ◽  
pp. 544-551 ◽  
Author(s):  
C. Y Liao ◽  
V. V Podrázský ◽  
G. B Liu
Keyword(s):  
Growth Analysis ◽  
Tree Height ◽  
Height Growth ◽  
Growth Data ◽  
White Pine ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Growth Functions ◽  
Pine Trees ◽  
Best Fit

Four theoretical growth functions, Mitscherlich, Logistic, Gompertz and Korf functions, were applied to the growth data on dbh and tree height of individual Eastern White Pine (Pinus strobus) trees to model their growth. The current increments, mean increments and relative growth rates of dbh and height as functions of age were given by derivation from the best fit growth functions. The growth processes of dbh and height were divided into three periods by the inflexion points of the corresponding current increment curves.

Growth Analysis of Weed and Crop Species with Reference to Seed Weight

Weed Science ◽  
1993 ◽  
Vol 41 (1) ◽  
pp. 52-56 ◽  
Author(s):  
Andrew C. Seibert ◽  
R. Brent Pearce
Keyword(s):  
Growth Rates ◽  
Seed Weight ◽  
Growth Analysis ◽  
Plant Root ◽  
Morphological Characteristics ◽  
Initial Size ◽  
Crop Species ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Length Increase

Growth and morphological characteristics of four weed and two crop species were analyzed to determine how small-seeded weeds can compete with large-seeded crops despite the initial size disadvantage. Small-seeded weeds had higher relative growth rates because of increased percentages of biomass devoted to leaves. This morphological scheme was achieved primarily through a reduction in the percentage of biomass devoted to roots. Yet, small-seeded weeds were able to develop larger mean plant root lengths as a result of having both roots of smaller diameter and higher rates of root length increase.

REPRODUCTION AND GROWTH IN THE CREEPING VOLE, MICROTUS OREGONI SERPENS MERRIAM

1954 ◽  
Vol 32 (3) ◽  
pp. 198-208 ◽  
Author(s):  
Ian McT. Cowan ◽  
Margaret G. Arsenault
Keyword(s):  
Litter Size ◽  
Growth Rates ◽  
Growth Data ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
In Captivity ◽  
In The Wild ◽  
Annual Turnover ◽  
Growth And Reproduction

The growth and reproduction of the cricetine rodent, Microtus oregoni serpens Merriam, has been studied in the laboratory and in the wild. Growth data arise largely from 28 captive born litters. It has been determined that gestation is [Formula: see text] to 25 days; that mean litter size is 2.95; that a postparturient oestrus is usual but frequently does not occur; that puberty occurs at 22–24 days in females and 34–38 days in males; that there is a sterile period of 5 to 14 days between first oestrus and first conception; longevity in captivity exceeded 320 days but in the wild there was a complete annual turnover. Instantaneous relative growth rates have been determined for four distinguishable phases of growth. A limited experiment using light and heat to stimulate increased reproduction had equivocal results.

Probabilities of small-gap capture by sugar maple saplings based on height and crown growth data from felled trees

2005 ◽  
Vol 35 (3) ◽  
pp. 643-655 ◽  
Author(s):  
William G Cole ◽  
Craig G Lorimer
Keyword(s):  
Sugar Maple ◽  
Initial Conditions ◽  
Tree Height ◽  
Height Growth ◽  
Stochastic Simulations ◽  
Gap Formation ◽  
Growth Data ◽  
Stochastic Variation ◽  
Single Tree ◽  
Advance Regeneration

We simulated the probability that Acer saccharum Marsh. saplings in single-tree gaps would reach the overstory before lateral gap closure. The model was calibrated with height and crown growth data from destructively sampled trees that ranged from 1 to 27 m tall. Each of the major initial conditions and growth processes was evaluated separately to determine its effect on gap-capture probabilities. Factors such as sapling height at the time of gap formation, continued height growth of border trees, and stochastic growth variation had pronounced effects on the outcome. Stochastic variation generally increased chances of sapling success by delaying closure times in some of the gaps and allowing some saplings to grow at above-average rates. In stochastic simulations with continued (asymptotic) border-tree height growth, probabilities of successful gap capture ranged from <20% of saplings 1–2 m tall to 35%–86% for saplings 7–8 m tall. The results suggest that some saplings may be able to capture gaps after one gap event, but probabilities are low for small saplings and for all saplings in small and medium gaps. Based on the mechanisms simulated here, most of the larger single-tree gaps (78 m2) are captured by advance regeneration more than 4 m tall.

Growth responses of six bryophyte species to different light intensities

1993 ◽  
Vol 71 (5) ◽  
pp. 661-665 ◽  
Author(s):  
Emmanuel Rincón
Keyword(s):  
Growth Rate ◽  
Light Intensity ◽  
Growth Rates ◽  
Growth Analysis ◽  
Total Chlorophyll ◽  
Light Conditions ◽  
Growth Responses ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Plastic Responses

The growth responses of Brachythecium rutabulum, Eurhynchium praelongum, Lophocolea bidentata, Plagiomnium undulatum, Pseudoscleropodium purum, and Thuidiurn tamariscinum, growing under seven different light conditions, were determined in a 36-day laboratory experiment. Biomass production, relative growth rate, chlorophyll content, and morphological plastic responses (bending of the shoots) were determined following initial and final harvests. All species achieved greater biomass as irradiance increased. This trend was also observed in the relative growth rates, which were higher as irradiance increased, for all the bryophytes investigated. All species except L. bidentata showed an increased elevation of the shoot as irradiance decreased. Total chlorophyll was higher in all species at the lowest irradiance level, but no clear differences were observed in the ratios of chlorophyll a to b for all the species. Key words: grassland bryophytes, light intensity, growth analysis, plasticity.

The effect of shade upon seedling growth in groundsel bush (Baccharis halimifolia L.)

1977 ◽  
Vol 28 (4) ◽  
pp. 681 ◽  
Author(s):  
FD Panetta
Keyword(s):  
Seedling Growth ◽  
Reproductive Output ◽  
Experimental Period ◽  
Height Growth ◽  
Light Conditions ◽  
Baccharis Halimifolia ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Treatment Comparisons ◽  
Reduced Light

Analysis of seedling growth of groundsel bush (Baccharis halimifolia L.) under different glasshouse light conditions indicated that seedlings growing in light shade (24% daylight) maintained relative growth rates equal to those of seedlings grown unshaded (57% daylight) for up to 11 weeks after germination. Compensation for reduced light was effected through increased leaf area rather than through increased photosynthetic efficiency. Although markedly less than in unshaded or light shade treatments, growth was maintained throughout the experimental period under the lowest radiant flux employed (17% daylight). Root systems developed more slowly and were smaller in shaded than in unshaded seedlings. Increased stem allocation (height growth) followed a peak in root allocation, and did not occur until 11 weeks after germination in any treatment. Comparisons of seed weight and seedling relative growth rate with associated pasture species indicate that groundsel is at a disadvantage in terms of both parameters. It appears that the success of this woody weed is due largely to a combination of high reproductive output and effective dispersal, which enables it to colonize relatively open microsites which occur in cultivated as well as natural field situations.

Responses of Pinusbanksiana and Pinusresinosa seedlings to flooding

1983 ◽  
Vol 13 (4) ◽  
pp. 633-639 ◽  
Author(s):  
Z. C. Tang ◽  
T. T. Kozlowski
Keyword(s):  
Shoot Growth ◽  
Dry Weight ◽  
Root Systems ◽  
Height Growth ◽  
Drastic Reduction ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Plant Parts ◽  
Weight Increment ◽  
Growth Production

Flooding of soil for 45 days severely inhibited growth of 115-day-old Pinusbanksiana Lamb, and P. resinosa Ait. seedlings, with significant effects apparent within 15 days after initiation of flooding. Both species adapted poorly to flooding of soil but P. banksiana was more adversely affected than P. resinosa as shown by earlier and more drastic reduction of growth in the former species. In both species flooding decreased the rate of height growth, production of secondary needles, dry weight increment, and relative growth rates of various plant parts. Root growth of both species was reduced more than shoot growth. The reduction in dry weight increment of root systems of both species reflected arrested branching and elongation of roots as well as decay of roots, mainly the very small nonwoody roots. Flooding slightly stimulated ethylene production by submerged stems.

COMPARISON OF SEEDLING GROWTH OF ROUGH FESCUE AND TALL FESCUE

1969 ◽  
Vol 49 (4) ◽  
pp. 465-470
Author(s):  
D. B. Wilson ◽  
A. Johnston
Keyword(s):  
Tall Fescue ◽  
Growth Rates ◽  
Festuca Arundinacea ◽  
Growth Analysis ◽  
Dry Weight ◽  
Native Grass ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Net Assimilation ◽  
Rough Fescue

Seedlings of a native grass, rough fescue, Festuca scabrella Torr., and of a tame grass, tall fescue, Festuca arundinacea Schreb., were grown in the greenhouse for 10 weeks. Each week 20 plants of each species were destructively harvested for growth analysis. Leaf and tiller numbers and leaf lengths were recorded for an additional 10 plants of each species. Mean net assimilation rates of rough fescue were similar to those of tall fescue, but leaf area ratios were significantly lower. Thus, mean relative growth rates of rough fescue were less than those of tall fescue. Tiller numbers were similar for both species but rough fescue produced fewer leaves. Dry weight of tops of the tame grass produced during the 10-week period was about 17 times that produced by the native grass.

Relative growth rates of two epiphytic lichens, Lobaria pulmonaria and Hypogymnia occidentalis, transplanted within and outside of Populus dripzones

Botany ◽  
2012 ◽  
Vol 90 (10) ◽  
pp. 954-965 ◽  
Author(s):  
Yngvar Gauslaa ◽  
Trevor Goward
Keyword(s):  
Growth Rate ◽  
Relative Growth Rate ◽  
Picea Glauca ◽  
Canopy Cover ◽  
Tree Height ◽  
P Fertilization ◽  
Lobaria Pulmonaria ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Area Growth

Overstory Populus has been shown to facilitate establishment by cyano- and cephalolichens on conifer branches within its dripzone; though the mechanisms behind this “dripzone effect” have yet to be elucidated. Here we test the following hypotheses that throughfall from Populus: (i) elevates bark pH; (ii) increases relative growth rate in cephalolichens; and (iii) stimulates their growth through phosphorus (P) fertilization. In southern British Columbia we transplanted the cephalolichen Lobaria pulmonaria (L.) Hoffm. (promoted by dripzones) and the acidophytic chlorolichen Hypogymnia occidentalis L.H. Pike for 14 months to 26 pairs of similar-sized Picea glauca × engelmannii situated within and outside of Populus dripzones. Half of our transplants were fertilized with P. Bark pH was significantly higher on spruce branches within than outside dripzones. Relative growth rate in L. pulmonaria increased with bark pH and was slightly higher within dripzones than outside, consistent with a facilitating effect of Populus on the Lobarion community. By contrast, the addition of P decreased relative thallus area growth in L. pulmonaria and increased relative thallus area growth in H. occidentalis; though a stronger influence on growth could be attributed to variation in canopy cover and tree height. We conclude that cephalolichens in our study area are unlikely to be facilitated by P leached from Populus.

Differential Impact of Insect Herbivores and Fungal Pathogens on the Eucalyptus Subgenera Symphyomyrtus and Monocalyptus and Genus Corymbia

1998 ◽  
Vol 46 (6) ◽  
pp. 723 ◽  
Author(s):  
C. Stone ◽  
J. A. Simpson ◽  
R. Gittins
Keyword(s):  
Growth Rates ◽  
Fungal Pathogens ◽  
Insect Pests ◽  
New South ◽  
Tree Height ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
South Wales ◽  
North Eastern ◽  
Canopy Damage

Comparisons of tree height, diameter, survival and levels of canopy damage from insect pests and fungal pathogens in young plantations of mixed eucalypt species were undertaken at three sites in north-eastern New South Wales (NSW). Results support the hypothesis that species of the informal subgenus Monocalyptus suffered less damage from insects and fungi than Symphyomyrtus. We demonstrated that under an intensive regime of insecticide and fungicide application Symphyomyrtus species tended to attain higher growth rates than the Monocalyptus. However, among the untreated controls the fastest growing trees were species of Monocalyptus. Multivariate biplot analyses consistently illustrated an affinity of Monocalyptus closer to Corymbia than Symphyomyrtus in terms of levels of damage from insects and fungi and relative growth rates.

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