Vegetation of Southeast Asia Studies of Forest Types 1963-1965

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ladochine. Archives Inst. Keener, Agron. Indochirie No. 4. 59 pp.
1950.
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Duranl, C.C.L. Growth of mangrove species in Malaya. Malayan Forester
10 (1): 3-15.
Earle, P.M. Geogre.pny of the Southeast Tropics. The Annals of the
American Academy of Political and Social Science. 226. 1-8.
March 19^3.
A brief discussion of the geography of Southeast Asia, treated
according to countries, with comments on agriculture.
Edwards, J.P. Growth of Malayan forest trees, as shown by sample plot
records, 1915-28. Mai. For. Sec. No. 9. pp. 1-151. 1930.
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manfOe, in Florida. Carib. For. 9 (k): 299-310. 19%B~.
Evans, G.C., T.C. Vhitmore ana Y.K. Wong. The distribution of light
reaching the ground vegetation in a tropical rain forest. The
Journ. of Ecol. U8 (l): 193-20U. k text-figs. Feb. 1960.
In March 1957 a study of light reaching the undergrowth of a
Tropical Rain Forest wjis made in Bukit Timah Nature Reserve,
Singapore. A survey of lighting conditions in this forest provides
data on the occurrence of sunflecks, also on lighting conditions
when the sun was shining and when obscured by cloud. These data
were used to determine the pattern of light on sample plots on the
forest floor under cloudy conditions. It was shown that this pattern
does not vary appreciably from day to day.
The daily march of light intensity under cloudy conditions* is
shown to be affected by two factors - a steadily increasing maximal
intensity as noon approaches and at the same time an increasing
number of periods of very low intensity, because of the accumulation
of dense clouds near midday on the days of observation.
The pattern on the forest floor under sunny conditions, without
sunflecks, when compared with that under cloudy conditions is
shown to be substantially different.
The problem of taking readings under hazy conditions, when thin
wisp clouds partly obscure the sun, is considered. These are shown
to approximate very closely an average to those made when the sun
was shining but with no cmnflecks.
The distribution of light reaching the forest floor between the
three categories of cloudy conditions, hazy conditions and sunny excluding
sunflecks, and the sunflecks themselves was studied for k
hours in the middle of the day. The large '•ontribution of sunflecks
20k