Dipterocarpus intricatus (Sample Datasheet)

Tree Species Data Sheet for
‘Digital Compendium of Forest Species in Cambodia’


Species: Dipterocarpus intricatus

Name of collector: Mathias Petri
Date of collection: 31/07/2006 (dd/mm/yyyy)



Part 1: Text information

- Divide the information within the chapters by paragraphs for each source
- For every information give the source after the text, then list all cited sources under ‘Part 3 - References’ at the bottom of this document)


A. Latin name(s):

Dipterocarpus intricatus Dyer

B. English name(s):

No name available.

C. Synonym(s):

No synonym available.

D. Other[1]:

may sa beng (Trade name) [4] - krat, hiang krat, chik, cha baeng, tabaeng, hiang khon, sat, tat (Thailand) [1] - dau trai, dau long (Vietnam) [4]

E. Khmer name(s) (Khmer letters):
Rtac
Source: [3]

F. Khmer name(s) (Latin letters):

krai, trai [1], trach, trach sa, trach snaeng, trach sra [2]

G. Taxonomic position (complete):

Kingdom: Viridiplantae
Phylum: Spermatophyta
Sub-Phylum: Angiospermae
Class: Dicotyledonae
Order: Malvales
Family: Dipterocarpaceae
Genus: Dipterocarpus Gaertner f.
Species: Dipterocarpus intricatus Dyer
Source: [1]

H. Botanical characteristics (d)[2]
[General]: A large deciduous tree, 20-30 m high [4] (15-30 m [2]) and 60-80 cm in DBH. Twigs and buds are covered with many star-shaped grey yellow to brown hairs.
[Bark]: The bark surface is grey brown or dark brown and longitudinally splitted into pieces. The inner bark is orange pink, 8-10 mm [4] thick or more.
[Leaves]: The leaves are simple, alternate and egg-shaped to oblong with a wedge-shaped base and a blunt leaftip, 10-30 x 8-14 cm [4] in size and hairy on both surfaces but especially on the lower surface. The secondary veins occur in 14 (-21) pairs [4] (10-15 pairs [1]. Leafstalks are 3-4.5 cm long [4] with protecting buds. The stipules are 3 cm long [4]. Dipterocarpus intricatus loses its leaves for only a few days every year. Old leaves fall in the end of December, young leaves appear in the beginning of January [4].
[Flowers]: The inflorescence (=raceme) is 16-18 cm long [4], often branched in 2-4, each branch consisting of 6-8 flowers [4], arranged in 2 rows with stalk-less flower at the place where the branches divide. The outer flower leaves (=sepals) are fused into a 5 lobed hairless tube, with the longest lobe 14 mm long [4], the other smaller lobes 2-3 mm long [4]. The outer flower leaves (=petals) are red, 3 cm long [4] and sickle-shaped. The flower contains 30 stamens [4]. Flowering starts in January [4] (January-December [1]).
[Fruits]: Fruiting occurs from March to April [4] (January-November [1]). The fruit is opposite egg-shaped, red when young and brown when mature, 2 x 1-1.5 cm [1] (1.5 cm long [4]). The fruit wings are spirally folded, 5 winded, with two large wings 6-7 x 1.5 cm [1] (8-11 cm long [4]) with 3-5 basal veins. The 3 shorter wings are approximately 1 x 0.5 cm [1] and curled back.
[1, 2, 4, 7]

I. Wood properties: (n)
[Wood Properties]: Sapwood and heartwood are distinctive. The sapwood is reddish and thin, the heartwood is red brown to dark red with a coarse texture and is heavy with a density of 0.66-0.93 g/cm³. It is durable and resistant to termites and insects.
[2, 4]

J. Geographic distribution and vegetation: (a),(e)
Dipterocarpus intricatus is a native species of the Indochine Peninsula where it is commonly found in open dry deciduous dipterocarp forests and periodically flooded plain forests mixed with other dipterocarps or in pure stands. "In Thailand, it is fairly common in open deciduous dipterocarp forest in the northeast. It is also found in the transition zone between dry evergreen and deciduous dipterocarp forests with Pinus merkusii" [1]. In Cambodia it occurs in open forests with other dipterocarps, in dense forests or secondary forests where Pinus merkusii is more or less abundant. There it is associated with Calophyllum spp., Payena elliptica, Carallia lucida, Eugenia zeylanica, Dipterocarpus obtusifolius, Dipterocarpus tuberculatus, Anisoptera spp., Shorea cochinchinensis, Shorea cf. hypochra, Parinarium annamense, Irvingia oliveri, Sindora cochinchinensis, Fragraea fragrans and Melanorrhoea laccifera. It is one of the dominant species in Cambodian open dry dipterocarp forest stands. There it grows with Capparis, Randia tomentosa, Memecylon laevigatum, Memecylon edule, Buchanania, Intsia, Irvingia oliveri, Cratoxylon spp., Terminalia mucronata, Pterocarpus pedatus, Dalbergia oliveri, Albizzia lebeck, Eugenia spp., Shorea cochinchinensis, Ochrocarpus spp., Azadirachta indica, Parinarium annamense, and Gardenia spp. In degraded dense deciduous forest it grows with Xylia, Schleichera, Andina, Spondias, Ceiba, Vitex, Hymenodyclion, Sterculia colorata, Milletia erythrocalyx, Strychnos, Schrebera, Holarrhena antidysenteria and species of the open forest like Cycas siamensis, Shorea obtusa, Careya, Arundinaria falcata, Buchanania latifolia, Terminalia bialata, Terminalia tomentosa, Aporosa (Krung), Phoenix humilis and common elements of secondary forests such as Combretum quadrangulare, Cratoxylon, Zizyphus, Cochlospermum, Streblus asper and Oroxylum. In closed moist evergreen forests it grows with Shorea cochinchinensis and Eugenia spp. It can also be found in degraded open forest (shrub savanna).
[1, 2, 4, 7]

K. Climate and environmental amplitude: (b),(c)
D. intricatus is mostly found in plains but also in hilly areas up to 500 m [2] (up to 400 m altitude [1], from 50-700 m [4], also below 50 m [7]). A tropical monsoon climate with a distinct dry season of 3-6 months [8] is suited best.
[1, 2, 4, 7, 8]

L. Gene ecological zone in Cambodia:[3]
No information available.

M. Soil and site conditions: (f),(g),(h),(i),(j)
Generally it grows on ferrallitic or sandy soils. "In the Prek Te region (Cambodia) it grows on soils which are sandy and easily friable (=easily breaking down into crumbs, like old bread). Their color is white to greyish on the surface, yellowish at 20 cm depth, becoming more and more solid with depth, more humid and loamy with traces of iron below 50 cm depth and lateritic concretions (= hard pieces of Al-Fe oxides). The parent (=underlying) rock, sometimes reaching the surface, consists of siliceous (=containing silicon) sandstone. Termite mounds are rare" [7].
[4, 7]

N. Utilization and importance: (n),(o),(p)
[Wood]: The wood is appreciated for the construction of carts and houses.
[2, 4]
[Non-wood]: The grey brown resin is collected from the tree and used in the same way as the one of Dipterocarpus alatus (see chapter 'Utilization and Importance' in the datasheet of Dipterocarpus alatus). It is mainly used for the preparation of torches.
[2, 4]
[Others]: No information available.

O. Cambodian wood classification: (n)
2nd class [3]

P. Silviculture and management: (e),(l),(m)
[General]: Dipterocarpus intricatus is is commonly found in open dry deciduous dipterocarp forests and periodically flooded plain forests mixed with other dipterocarps or in pure stands. In Cambodia it occurs in open forests with other dipterocarps, in dense forests or secondary forests where Pinus merkusii is more or less abundant. It is one of the dominant species in Cambodian open dry dipterocarp forest stands and in degraded dense deciduous forests but also in degraded open forest (shrub savanna). In closed moist evergreen forests it grows with Shorea cochinchinensis and Eugenia spp.
[1, 2, 4, 7]
[Natural regeneration]: "Dipterocarpus seedlings and saplings can persist in the forest for years under heavy shade. In the first 2 years, major openings in the canopy are not tolerated, but after the seedlings are well established (about 120 m tall) the canopy can be opened up, to speed up growth. Many species regenerate well only in primary forest" [6] .
[Establishment]: "When the seedlings are planted in open areas shade trees are used, such as Acacia auriculiformis and Paraserianthes falcataria" [6].
[Management]: No information available.

Q. Propagation: (k)
Natural and coppice regeneration is good. Seedlings are also used for planting.
[4, 6]

R. Hazards and protection:
[Pests]: No information available.
[Diseases]: No information available.
[Others]: No information available.

S. Conservation:
This species has not yet been classified according to the IUCN (International Union for the Conservation of Nature) World List of Threatened Trees (='IUCN Red Databook'). However, its status is suggested as a species 'of least concern' (LR lc). Although it is confined to the northeast of Thailand and Indochina, it is common throughout its potential distribution.
[1]

T. Species location in Cambodia (native and introduced):

No information available.

U. Species location in the world (native and introduced):
[World Distribution]:
[Native]:
Vietnam, Cambodia, Laos, Thailand, Malaysia.
[4, 5]
[Introduced]:
Apparently this species does not occur yet outside of its natural range.
[8]

V. Miscellaneous[4]:
[Hybrids]: "Dipterocarpus intricatus x D. tuberculatus was collected in Sakaerat, Nakhon Ratchasima (Thailand). It is characterised by intermediate characters of the fruit." [1]

W. Further readings[5]:
No information available.
[1] Here you can type in names in e.g. French, Thai, Vietnamese, etc.
[2] The small letters refer to the sections in Part 2 - Tick List which contain similar information. It will allow you to convert your text data easily into tick list data.

[3] As defined by the Cambodian Tree Seed Project (CTSP). You can find further information in ‘CTSP, 2003: Gene Conservation Strategy, Species Monographs, Gene Ecological Zonation, Species Site Matching Model. (CD-ROM).
[4] Type in here all the information that doesn’t fit into one of the sections.
[5] If you have discovered a new source like a book or website with specific information about this species, please type it here.

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