scholarly journals The influence of environmental factors on the diameter growth of forest trees : Auxanometric study

1969 ◽  
Vol 0 (92) ◽  
Author(s):  
Matti Leikola
Keyword(s):  
Environmental Factors ◽  
Diameter Growth ◽  
Forest Trees

Effects of dwarf mistletoe on the response of young Douglas-fir to thinning

1986 ◽  
Vol 16 (1) ◽  
pp. 30-35 ◽  
Author(s):  
Donald Knutson ◽  
Robert Tinnin
Keyword(s):  
Radial Growth ◽  
Height Growth ◽  
Douglas Fir ◽  
Diameter Growth ◽  
Forest Trees ◽  
Dwarf Mistletoe ◽  
Lower Infection

Four sites from two forests were examined to determine the effect of various levels of infection by Arceuthobiumdouglasii on the growth of Pseudotsugamenziesii in precommercially thinned stands. We found less than 1% mortality among the trees that we examined. Changes in level of infection did occur; we estimate that changes to levels of infection sufficient to cause significant reductions in diameter growth occurred among 19% of the infected trees that we studied. Height growth was significantly reduced in both forests, while diameter growth was reduced by infection in one forest. Trees of lower infection rating (dwarf mistletoe rating 0–2) showed a significant increase in radial growth following thinning in both forests, while more heavily infected trees (dwarf mistletoe rating 5 and 6) did not. Trees that were heavily infected and had spike tops consistently showed significant reductions in diameter growth in both forests.

Nitrogen and phosphorus fertilization of Jamaican montane forest trees

1990 ◽  
Vol 6 (2) ◽  
pp. 231-238 ◽  
Author(s):  
E. V. J. Tanner ◽  
V. Kapos ◽  
S. Freskos ◽  
J. R. Healey ◽  
A. M. Theobald
Keyword(s):  
Montane Forest ◽  
Phosphorus Fertilization ◽  
Diameter Growth ◽  
Forest Trees ◽  
Triple Superphosphate ◽  
Nitrogen And Phosphorus ◽  
Leaf Production ◽  
Trunk Diameter ◽  
Foliar N ◽  
Common Tree

ABSTRACTPlots in the Jamaican montane forest were fertilized with nitrogen or with phosphorus to test the hypothesis that growth of trees in this natural forest is limited by the supply of N and P from the soil.Once a year from 1983 to 1986, urea was added to one plot (at 150 kg N ha−1 y−1) and triple superphosphate was added to another (at 50 kg P ha−1 y−1). In each of these plots and in two control plots, foliage of four common tree species was collected immediately before each fertilizer addition. Trunk growth was measured in 105 individuals.Foliar N concentrations were not significantly higher in trees fertilized with N compared to control trees. In Dendropanax cf. pendulus and Hedyosmum arborescens fertilization with N resulted in lower P concentrations but only after the third year of fertilization, possibly due to dilution by increased leaf production. Mean trunk diameter growth was significantly higher in the N-fertilized trees than in controls.Mean foliar P concentrations were higher in Podocarpus urbanii and Clethra occidentalis following fertilization with P, but only after two years of fertilization. Trunk diameter growth was greater in the P fertilized plot.Thus growth in some Jamaican montane forest trees was limited by the natural supplies of N and of P.

Diameter Growth Losses in Western Larch Caused by Larch Casebearer Defoliation

1991 ◽  
Vol 6 (4) ◽  
pp. 105-108 ◽  
Author(s):  
Rene I. Alfaro ◽  
Liang Qiwei ◽  
John Vallentgoed
Keyword(s):  
Environmental Factors ◽  
Correlation Coefficient ◽  
Pseudotsuga Menziesii ◽  
Growth Pattern ◽  
Douglas Fir ◽  
Diameter Growth ◽  
Larix Occidentalis ◽  
Western Larch ◽  
Breast Height ◽  
Coleophora Laricella

Abstract The diameter growth of western larch, Larix occidentalis, was studied in two stands defoliated by the larch casebearer, Coleophora laricella. Before defoliation, the growth pattern of larch was highly synchronized (correlation coefficient ≥0.82) with that of Douglas-fir, Pseudotsuga menziesii, a nonhost for the casebearer on the same site, indicating that both species were under the influence of the same environmental factors. During the defoliation years, the growth of larch was only loosely related to the growth of Douglas-fir. A model which predicted growth of larch based on growth of Douglas-fir indicated that defoliation caused a loss of approximately 29% in the breast height diameter growth of larch. West. J. Appl. For. 6(4):105-108.

scholarly journals Studies on the Formation of Epicormic Shoots on Eucalypt Stem Segments

1969 ◽  
Vol 22 (5) ◽  
pp. 1291 ◽  
Author(s):  
EP Bachelard
Keyword(s):  
Diameter Growth ◽  
Forest Trees ◽  
Timber Quality ◽  
Epicormic Shoots ◽  
A Site ◽  
Stem Segments

Epicormic shoots occur on many forest trees including eucalypts. They are formed from bud-producing tissue situated in the bark at the ends of the epicormic bud strand. The strands originate in leafaxils, and grow radially outward at almost exactly the same rate as diameter growth of the stem (Jacobs 1955). The epicormic bud is normally dormant but may develop into a shoot within the live crown, aiding in crown maintenance, or on the clear bole where it may seriously reduce timber quality as a knot, gum vein, or a site for fungal infeotion.

scholarly journals THE EFFECT OF ARTIFICIAL DEFOLIATION OF VARIOUS AGES OF LEAVES UPON WHITE PINE GROWTH

1958 ◽  
Vol 34 (1) ◽  
pp. 51-56 ◽  
Author(s):  
S. N. Linzon
Keyword(s):  
Growing Season ◽  
Diameter Growth ◽  
Forest Trees ◽  
White Pine ◽  
Inadequate Information ◽  
Different Ages ◽  
Pine Trees ◽  
One Year ◽  
The One ◽  
Axial Development

Foliage injuries produced by disease-causing organisms or adverse environmental influences may be confined to leaves of a specific age occurring among the "perennial" foliage of coniferous trees. Inadequate information exists concerning the effectiveness of leaves of different ages in promoting the growth of forest trees. An experiment was conducted to assess the effects of artificial removal of foliage of different ages from white pine trees upon height and diameter growth, subsequent axial development and foliage vigor. Although the observations show that all three ages of foliage are utilized in the growth of white pine, it is indicated that during the growing season the one-year-old foliage may be more important than the two-year-old foliage or foliage produced during the current year.

scholarly journals The growth of Shorea leprosula at various planting distances and slopes in Gunung Dahu Research Forest, Bogor, Indonesia

2020 ◽  
Vol 21 (9) ◽  
Author(s):  
Prijanto Pamoengkas ◽  
Henti Hendalastuti Rachmat ◽  
Nadya Khalifa
Keyword(s):  
Environmental Factors ◽  
Height Growth ◽  
Plantation Forestry ◽  
Diameter Growth ◽  
Height Increment ◽  
Planting Distance ◽  
Shorea Leprosula ◽  
Slope Class

Abstract. Pamoengkas P, Rachmat HH, Khalifa N. 2020. The growth of Shorea leprosula at various planting distances and slopes in Gunung Dahu Research Forest, Bogor, Indonesia. Biodiversitas 21: 4396-4404. Shorea leprosula Miq. is one of the species of Dipterocarpaceae family which has great potential to be developed as plantation forestry. This research aimed to investigate the effect of planting distance and slope on the growth of S. leprosula in Gunung Dahu Research Forest, Bogor, Indonesia. Growth variables in terms of height and diameter, and environmental factors were observed in S. leprosula stands at various planting distances and slopes. Analysis results showed that plot with planting distance of 4x6 m produced the best growth of S. leprosula than other planting distances, with the largest increment of diameter and height of 1.49 cm/year and 0.82 m/year, respectively. Slope class did not affect the diameter growth, but it affected the height growth. Slope class flat (0-8%) exhibited height growth of S. leprosula of 0.81 cm/year, which was better compared to other slope classes. Interaction between planting distance of 4x6 m and slope class of rather steep (15-25%) produced the best growth of S. leprosula compared to other interactions with diameter and height increment of 1.64 cm/year and 0.83 m/year, respectively.

scholarly journals INFLUENCE OF MORPHOLOGICAL AND ENVIRONMENTAL FACTORS ON DIAMETER GROWTH OF Caesalpinia gaumeri Greenm IN A TROPICAL DECIDUOUS FOREST IN MEXICO

2014 ◽  
Vol XX (3) ◽  
pp. 255-270
Author(s):  
Víctor M. Interián-Ku ◽  
◽  
Humberto Vaquera-Huerta ◽  
Juan I. Valdez-Hernández ◽  
Edmundo García-Moya ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Deciduous Forest ◽  
Tropical Deciduous Forest ◽  
Diameter Growth

Reductionist thinking and animal models in neuropsychiatric research

2019 ◽  
Vol 42 ◽  
Author(s):  
Nicole M. Baran
Keyword(s):  
Animal Models ◽  
Mental Disorders ◽  
Environmental Factors ◽  
Neuropsychiatric Disorders ◽  
Model Organisms ◽  
Developmental Genetic ◽  
Term Study ◽  
Genetic And Environmental Factors ◽  
Mechanisms Of Plasticity

AbstractReductionist thinking in neuroscience is manifest in the widespread use of animal models of neuropsychiatric disorders. Broader investigations of diverse behaviors in non-model organisms and longer-term study of the mechanisms of plasticity will yield fundamental insights into the neurobiological, developmental, genetic, and environmental factors contributing to the “massively multifactorial system networks” which go awry in mental disorders.

The dual nature of obesity in metabolic programming: quantity versus quality of adipose tissue

2020 ◽  
Vol 134 (18) ◽  
pp. 2447-2451
Author(s):  
Anissa Viveiros ◽  
Gavin Y. Oudit
Keyword(s):  
Adipose Tissue ◽  
Environmental Factors ◽  
Maternal Obesity ◽  
Metabolic Programming ◽  
Dual Nature ◽  
Prevalence Of Obesity ◽  
Adipose Tissue Volume ◽  
Males And Females ◽  
Metabolically Healthy

Abstract The global prevalence of obesity has been rising at an alarming rate, accompanied by an increase in both childhood and maternal obesity. The concept of metabolic programming is highly topical, and in this context, describes a predisposition of offspring of obese mothers to the development of obesity independent of environmental factors. Research published in this issue of Clinical Science conducted by Litzenburger and colleagues (Clin. Sci. (Lond.) (2020) 134, 921–939) have identified sex-dependent differences in metabolic programming and identify putative signaling pathways involved in the differential phenotype of adipose tissue between males and females. Delineating the distinction between metabolically healthy and unhealthy obesity is a topic of emerging interest, and the precise nature of adipocytes are key to pathogenesis, independent of adipose tissue volume.

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