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>

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.

scholarly journals Herb-chronology as a tool for determining the age of perennial forbs in tropical climates

Botany ◽  
2018 ◽  
Vol 96 (1) ◽  
pp. 73-78 ◽  
Author(s):  
Mickel Randolph Hiebert-Giesbrecht ◽  
Candelaria Yuseth Novelo-Rodríguez ◽  
Gabriel Rolando Dzib ◽  
Luz María Calvo-Irabién ◽  
Georg von Arx ◽  
...  
Keyword(s):  
Developmental Stages ◽  
Annual Growth ◽  
Wild Plant ◽  
Growth Rings ◽  
Tropical Regions ◽  
Herbaceous Perennials ◽  
Tropical Plant ◽  
Annual Growth Rings ◽  
Tropical Climates ◽  
Herbaceous Perennial

Age in wild plant populations is one of the most elusive developmental parameters in plant biology. Several approaches take advantage of a plant’s morphological traits to determine developmental stages or plant age. Annual growth rings forming in woody tissues of perennial plants are one of the traits that have been widely used to determine the age of trees (dendrochronology) and, more recently, herbaceous perennials (herb-chronology). In temperate, alpine, and arctic climates, it has been reported that seasonal variations in climate lead to the formation of annual growth rings in herbaceous perennial forbs; however, to date, no similar studies have been carried out on plants from tropical regions. We have investigated the applicability of herb-chronology on the tropical plant Pentalinon andrieuxii (Müll. Arg.) B.F. Hansen & Wunderlin, a native vine of the Yucatan peninsula. Our results show that herb-chronology is a potentially useful tool in determining the age of plants growing in tropical climates.

scholarly journals A Guarneri violin in the attic: the power of dendrochronology for analysing musical instruments

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Mauro Bernabei
Keyword(s):  
Tree Ring ◽  
Ring Width ◽  
Musical Instrument ◽  
Musical Instruments ◽  
Annual Growth ◽  
Growth Rings ◽  
Non Invasive ◽  
Annual Growth Rings ◽  
Privately Owned ◽  
Supply Information

AbstractDendrochronology is the science that dates wooden artefacts by measuring annual growth rings visible in the wood. And, in the case of musical instruments, the method is non-invasive. In addition, dendrochronology can also help to identify the wood’s provenance and to supply information on how the soundboard was made, giving details of ring width and regularity. This study also demonstrates the effectiveness of dendrochronology in attributing a musical instrument to an important luthier. It deals with a privately owned violin, whose date and origin had previously remained uncertain, despite various attempts to authenticate, at least, its technical and stylistic characteristics. The outermost tree-ring of the instrument’s soundboard was dendrochronologically dated to the year 1696 and attributed, with certainty, to the Italian luthier Giuseppe Guarneri filius Andreae, father of the famous Bartolomeo Giuseppe Guarneri "del Gesù". Thanks to dendrochronology, in this way, a twin of an already existing violin has been identified that was made by the same luthier. Both violins are identical in construction, having the same veining and dimensions, and the wood from the same tree was used in all parts, including the soundboard. Dendrochronology has, thus, been proven to be an extremely useful method, which has transformed a violin of uncertain value into a museum piece.

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.

Useful Strategies for the Development of Tropical Tree-Ring Chronologies

IAWA Journal ◽  
1999 ◽  
Vol 20 (3) ◽  
pp. 249-253 ◽  
Author(s):  
David W. Stahle
Keyword(s):  
Tree Ring ◽  
Ring Width ◽  
Tropical Species ◽  
Growth Rings ◽  
Seasonally Dry ◽  
Effective Strategies ◽  
Annual Growth Rings ◽  
Individual Trees ◽  
The Tropics ◽  
Cross Dating

This paper outlines efficient strategies for the development of long, climatically sensitive tree-ring chronologies in the tropics. Effective strategies include sampling useful temperate or subtropical species that extend naturally into the tropics; sampling species in botanical families that have already provided examples useful for dendrochronology (e. g., Pinaceae, Taxodiaceae, Verbenaceae); targeting deciduous species in seasonally dry forests; and sampling species described in the literature or found in xylaria that have promising anatomical features such as ring porosity and marginal parenchyma. Dendrochronology can also be used to test the annual nature of growth banding in tropical species. The cross-dating oflong ring-width time series between individual trees and between multiple sites in a region is strong evidence that the growth rings are indeed synchronized with the annual calendar. This can be confirmed if the ring-width data are also strongly correlated with long annual or seasonalized records of climate variability. Blind cross-dating tests to identify the cutting dates of known-age timbers can provide a final proof that a species produces reliable annual growth rings.

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
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