scholarly journals Annual growth rings, rainfall‐dependent growth and long‐term growth patterns of tropical trees from the Caparo Forest Reserve in Venezuela

1999 ◽  
Vol 87 (3) ◽  
pp. 391-403 ◽  
Author(s):  
Martin Worbes
Keyword(s):  
Tropical Trees ◽  
Growth Patterns ◽  
Annual Growth ◽  
Growth Rings ◽  
Forest Reserve ◽  
Annual Growth Rings ◽  
Dependent Growth

Age and growth of a large tropical anchovy, Thryssa hamiltoni (Gray): A comparison of ageing techniques

1992 ◽  
Vol 43 (5) ◽  
pp. 953 ◽  
Author(s):  
FE Hoedt
Keyword(s):  
Growth Patterns ◽  
Annual Growth ◽  
Age And Growth ◽  
Seasonal Growth ◽  
Length Frequency ◽  
Growth Rings ◽  
Handling Stress ◽  
Growth Increments ◽  
Annual Growth Rings ◽  
Ageing Methods

Three principal ageing methods were used to describe the growth history of Thryssa hamiltoni, a large tropical anchovy from the waters off Townsville, north-eastern Queensland. The study was undertaken to compare ageing methods based on length-frequency analysis that are commonly applied in age and growth studies of tropical clupeoids, with less commonly used methods based on daily and seasonal growth rings in otoliths. A preliminary study suggested that seasonal growth rings in the sagittae of T. hamiltoni were formed annually and were therefore useful for age estimations for this species. Age and growth estimates derived from the three methods were consistent, with the results of each method supporting the results of the others. Direct validation of daily growth increments in T. hamiltoni by means of tetracycline marking experiments was unsuccessful due to the sensitivity of this species to handling stress. The distribution of modes in length-frequency histograms, and age estimates based on annual growth rings, both showed that male and female T. hamiltoni exhibit different growth patterns, with females growing faster and attaining greater maximum lengths than do males. Although counts of annual growth rings suggest a maximum longevity of 4 years for both males and females, lengthfrequency data indicate that the population is largely comprised of fish up to 2 years of age.

PERTUMBUHAN LINGKARAN POHON JATI PADA DUA SISTEM KULTUR BERBEDA DI JAWA TIMUR

2008 ◽  
Vol 6 (2) ◽  
Author(s):  
Iriwi Louisa S. Sinon
Keyword(s):  
Tree Ring ◽  
Tectona Grandis ◽  
Annual Growth ◽  
Natural Growth ◽  
Growth Rings ◽  
Climate Effect ◽  
Tropical Regions ◽  
Annual Growth Rings ◽  
Chronological Sequence ◽  
Plantation Teak

<p><em>Study dendrochronology or tree-ring dating is defined as the study of chronological sequence of annual growth rings in trees. Teak (Tectona grandis) is one of various tree species that has been identified for the use of tree-ring studies in tropical regions. Teak is found to be suitable for dendrochronology as it is long-lived and develops defined annual growth rings. In Java, teak cans growth naturally or intensively in plantation. The two silviculture conditions will give different sensitivity on climate effect. Therefore, the effect of silviculturer will on natural teak and plantation teak in Saradan, Madiun, and East Java. As a part of the study, ten core samples from natural- growth teak were measured. The samples of growth rings is spanned from 1832 – 2004. Using the COFECHA program, the correlation of the samples (r) was found to be 0.44 point, which is satisfactory to the standard used in dendrochronology. Thus, from this study it can be concluded that natural teak could still be used in dendrochronology, although the sensitivity are not as high as plantation teak. </em></p>

Magnetic resonance imaging of wood

1986 ◽  
Vol 16 (2) ◽  
pp. 423-426 ◽  
Author(s):  
Laurance D. Hall ◽  
Vasanthan Rajanayagam ◽  
Wendy A. Stewart ◽  
Paul R. Steiner
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Structural Features ◽  
Annual Growth ◽  
Resonance Imaging ◽  
Growth Rings ◽  
Magnetic Resonance Scanner ◽  
Annual Growth Rings ◽  
Do So

A magnetic resonance scanner has been used to obtain images at 0.14 T, based on the water in aspen (Populustremuloides Michx.). In addition to visualization of the expected structural features such as annual growth-rings and knots, several additional features appear that require further study. Kiln-dried wood does not contain sufficient water to give an image, but can do so after impregnation with water.

Annual growth rings in the mangrove Laguncularia racemosa (Combretaceae)

Trees ◽  
2008 ◽  
Vol 22 (5) ◽  
pp. 663-670 ◽  
Author(s):  
Gustavo Calderucio Duque Estrada ◽  
Cátia Henriques Callado ◽  
Mário Luiz Gomes Soares ◽  
Cláudio Sérgio Lisi
Keyword(s):  
Annual Growth ◽  
Laguncularia Racemosa ◽  
Growth Rings ◽  
Annual Growth Rings

Management implications of annual growth rings in Pterocarpus angolensis from Zimbabwe

1999 ◽  
Vol 124 (2-3) ◽  
pp. 217-229 ◽  
Author(s):  
D.W Stahle ◽  
P.T Mushove ◽  
M.K Cleaveland ◽  
F Roig ◽  
G.A Haynes
Keyword(s):  
Annual Growth ◽  
Growth Rings ◽  
Management Implications ◽  
Pterocarpus Angolensis ◽  
Annual Growth Rings

Dendrochronological Potential of Fraxinus Uhdei and Its Use as Bioindicator of Fossil CO2 Emissions Deduced from Radiocarbon Concentrations in Tree Rings

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 833-840 ◽  
Author(s):  
Laura E Beramendi-Orosco ◽  
Sergio Hernandez-Morales ◽  
Galia Gonzalez-Hernandez ◽  
Vicenta Constante-Garcia ◽  
Jose Villanueva-Diaz
Keyword(s):  
Urban Areas ◽  
Annual Growth ◽  
Growth Rings ◽  
Variation Pattern ◽  
Tropical Regions ◽  
Suess Effect ◽  
Variation Patterns ◽  
Annual Growth Rings ◽  
Increasing Trend ◽  
Tropical Areas

Dendrochronological studies are limited in tropical regions because not many tree species form annual growth rings. This work reports an evaluation of the dendrochronological potential of tropical ash (Fraxinus uhdei) and its use as a bioindicator of fossil CO2 concentration in urban areas by means of radiocarbon analysis on growth rings. We analyzed a cross-section of a tree that grew during the period 1932–2007 in San Luis Potosí, one of the most industrialized cities in Mexico. The Δ14C values obtained follow the same variation pattern as the calibration curve of the Northern Hemisphere (NH) zone 2 (Hua and Barbetti 2004), with the peak centered in 1964, but they are lower by up to 124′. The high correlation coefficient (r = 0.990, p < 0.001) between the variation patterns indicates that this species does form annual growth rings, and the lower values can be attributed to the 14C dilution caused by fossil CO2 emissions. The magnitude of the Suess effect varied between −6.9% and −0.5%, equivalent to fossil CO2 concentrations ranging between 21.9 and 1.5 ppmv. The Suess effect and fossil CO2 values have significant variations with no apparent monotone increasing trend, suggesting that the CO2 emissions during the studied period have diverse sources. It is concluded that F. uhdei has potential for dendrochronological studies in tropical areas because its growth rings are formed annually and, furthermore, it can be used as a bioindicator of atmospheric 14C variations and fossil CO2 concentration in urban areas.

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