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BIOTROPIA - The Southeast Asian Journal of Tropical Biology
Published by Southeast Asian Regional Centre for Tropical Biology
ISSN : 02156334     EISSN : 1907770X     DOI : http://dx.doi.org/10.11598/btb
Core Subject : Health, Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary
BIOTROPIA, The Southeast Asian Journal of Tropical Biology, is a scientific publication of the Southeast Asian Ministers of Education Organization (SEAMEO) – Southeast Asian Regional Center for Tropical Biology (BIOTROP). It publishes articles in the broad areas of tropical ecosystems and environmental impacts, biodiversity conservation and sustainable development and biotechnology.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 7 Documents
 1 
Search results for , issue "Vol. 1 No. 1 (1987)" : 7 Documents clear
STUDIES ON THE BREEDING STRUCTURE OF TREE SPECIES IN THE TROPICAL RAIN FOREST. I: FAMILY CLUMPS AND INTRAPOPULATION DIFFERENTIATION KAN-ICHI SAKAI
BIOTROPIA - The Southeast Asian Journal of Tropical Biology Vol. 1 No. 1 (1987)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1417.793 KB) | DOI: 10.11598/btb.1987.1.1.83

Abstract

Breeding  structures  of  two  tropical  rain  forest  tree species,  Altingia  excelsa  in  Java  and  Agathis borneensis in  Kalimantan  were  investigated.  Assuming  that  similarity  in  the  assortment  pattern  of  the isoperoxidase bands tells genetic relationship between trees, on the one hand, and that inbreeding  increases smaller  values  of  the  disagreement  counts,  on  the  other,  it  has  been  concluded that  inbreeding  occurs considerably in Altingia excelsa and to some extent in Agathis borneensis. Finding that trees showing very low disagreement counts are located close to each other, they were grouped as an assumptive family. It was found that different families were quite dissimilar with respect to isoperoxide  constitution and in several  leaf characters as well. The distance between two trees at which they can mate is estimated to be 16 to 18 meters or 16.5 meters and the area one family occupies is 200 to 250 m^, assuming that a family clump can be a breeding unit in Altingia excelsa, within which trees mate at random. Some families were distributed mixed with each other within  the mating  distance,  but  they  were  found  still  genetically differentiated  from  each  other. This reproductive  isolation  among  families  is  interpreted  to  be  due  to  genetic  differences  between  families  in flowering time. In Agathis borneensis,  there was no indication of family clump formation. Related trees may have been widely scattered in the forest, and the inbreeding of the species may be due to self-fertilization of individual trees and not to outcrossing between relatives.
IV. STORAGE AND GERMINATION TESTS ON SHOREA JAVANICA SEEDS UMBOH, M.I.J.
BIOTROPIA Vol. 1 No. 1 (1987)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (449.986 KB) | DOI: 10.11598/btb.1987.1.1.88

Abstract

Seeds  of  Shorea  javanica  K  &  V  (Dipterocarpaceae),  were  subjected  to  different  treatments  of temperature (27 ± 2°C, 20 ± 2°C and < 10°C), coating (ash and paraffin) and relative humidity (20, 66 and 86%) and their germination capability as well as moisture content assessed after 3, 7, 14 and 30 days of storage. The germination percentage of  the seeds stored 30 days  in a  cloth bag under different  conditions of temperature showed highly significant differences  (a = 0.01). No significant differences were  found on  the effect of coating, duration of storage as well as on the interaction between these two factors. The moisture content of the seeds between 13 and 14% gave a germination percentage above 50% after 30 days.   
SOILS FROM CULTIVATED STANDS OF SHOREA JAVANICA SKHFFINGTON, M.J. SHEEHY
BIOTROPIA Vol. 1 No. 1 (1987)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (592.416 KB) | DOI: 10.11598/btb.1987.1.1.86

Abstract

Soils from Shorea javanica plantations in different parts of Lampung province, South Sumatra were sampled to a depth of 50 cm and described. They varied  from quite deep loamy alkaline soils near Krui, to sticky acid clays behind Ngaras. The cation content of most samples was quite high, but organic nutrients were low, suggesting volcanic origin of  the soils. Preliminary observations of  performance in situ of S. javanica would suggest a requirement for deep loamy, fairly alkaline soils with a moderately high exchangeable cation content for optimal yield and performance.
MULTIDISCIPLINARY RESEARCH ON Shorea javanica TORQUEBIAU, E.F.
BIOTROPIA Vol. 1 No. 1 (1987)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.1987.1.1.84

Abstract

It was April 1985, under  the  leadership  of Dr.  Ir. Z. Goto,  then Tropical Forest Biology Program Manager, that it was decided to launch in BIOTROP a multidisciplinary research on Shorea javanica. This followed the publication in 1984 by E.F. Torquebiau of a paper describing the traditional planting of this tree for resin production by farmers near the small town of Krui, in Lampung Province, Southern Sumatra (Man-made dipterocarp forest in Sumatra. Agroforestry Systems, 2: 103-127). A proposal was subsequently made to develop in BIOTROP different research topics around this species in order to promote it  for  plantation  forestry.  The  choice  of  this  species  was  justified  by  the  important knowledge from its traditional uses and planting, while in the long term, it is hoped that the development of plantations of this species will promote the use of other dipterocarps and native trees for plantation forestry.
V. PRELIMINARY STUDY ON ISOZYMES OF SHOREA JAVANICA JUNIARTI, U.
BIOTROPIA Vol. 1 No. 1 (1987)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.1987.1.1.89

Abstract

The detection of genetic variability in natural or man-made populations/ plantations is useful in both basic and applied biology. In addition to the various facets of studies on Shorea javanica already initiated by Torquebiau (1984) and alongside with his recommendations on focus for future research, a study on the genetic aspects of the species should be given important considerations. As the trees are tapped for resin, an important forest product, the genetic basis of the production as well as the range of variation in amount of resin production among the trees must be known. Coupled with this is a thorough investigation on the differences in pest resistance/susceptability among the trees and their genetic basis. While the assumption (Torquebiau 1984) that trees in natural forest areas are-rarely attacked by diseases because of mycorrhizal fungi is interesting, its confirmation is necessary. If this is true, problems would arise when plants are introduced into a new plantation site as experienced by the Forest Research Institute (Ardikoesuma 1954). Thus, we need to look for pest resistant plants i.e. those that can remain healthy even in the absence of mycorrhizae. The above studies on possible genetic variation could give vital information for development of forest plantations of the species and for breeding and tree improvement strategies. By knowing the extent of genetic variation in natural population or in plantations one could be guided to maintain or increase the genetic base in these areas. Biochemical characters such as isozyme banding patterns have been useful in several areas of plant biology, population genetics, evolution and breeding. Isozymes are detected by starch gel electrophoresis and when their genetic control is established, they could be genetic markers in analyzing variation in morphological or physiological characters. The present study is an attempt to detect the isozymes in leaves, seeds and cotyledons of Shorea javanica by gel electrophoresis.
STUDIES ON INTERFERENCE AMONG TREES IN A PLANTATION OF ALTINGIA EXCELSA SAKAI, KAN-ICHI
BIOTROPIA Vol. 1 No. 1 (1987)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.1987.1.1.85

Abstract

A  study  was made with  the  use  of  a  50-year  old  Altingia  excelsa Noronha  plantation with  260 standing trees for separating components of density and intraspecific competition. A component of density effect  causes overall decrease  in growth while  that of  competition  results  in a  contrasting  effect  in growth between any pair of neighboring trees. To detect this density effect, it is most appropriate to use an area of ca. 100 m2 irrespective of the experimental area, e.g. circular or quadratic. Competition effect cannot be detected when two individuals are apart more than two meters. An application of the density and competitive ability to tree breeding is briefly mentioned.
MYCORRHIZAE IN AGROFORESTRY: A CASE-STUDY NUHAMARA, S.T.
BIOTROPIA Vol. 1 No. 1 (1987)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.1987.1.1.87

Abstract

Census of mycorrhizae in Shorea javanica agroforests has been made periodically in the district of Krui, Lampung, Sumatra. Amanita hemibapha (Amanitaceae), Cantharellus cibarius (Cantharella-ceae), Lactarius spp., Russula spp. (Russulaceae) and Scleroderma sp. (Sclerodermataceae) were commonly encountered on the agroforest floor. These mycorrhizal fungi are naturally associated with  the planted trees. The significance of mycorrhizae for the maximization of growth and sustained productivity of resin is discussed as well as the need to design well defined agroforestry systems to facilitate growth and to improve production management techniques.

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