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Title: The growth and physiology of tropical forest tree seedlings in relation to light
Author: Kamaluddin, Mohammed
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1991
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This work reports the results of the experiment on the growth and physiology of tropical forest tree seedlings in relation to light. The experiments were carried out in a controlled environment simulating forest light conditions. The species studied were Anthocephalus chinensis (Lamk.) Rich. ex Walp., Bischofia javanica Blume, and Hopea odorata Roxb. from the moist forests of tropical Asia. The main aim of this study was to characterise the responses of seedlings in relation to (a) irradiance and nutrient supply, (b) shadelight quality, red to far-red (R:FR) ratio or low proportion of blue light, and (c) changing light availability. The species displayed differential growth responses when their seedlings were grown at different levels of irradiance and nutrient supply. Growth of gap species Bischofia was more plastic than that of the climax species Hopea. The growth of the former was substantially restricted when the nutrient supply was low at the higher irradiances. Pioneer species Anthocephalus responded to a low R:FR ratio by a large increase in stem extension growth with concomitant increase in allocation of dry matter to stem at the expense of leaf development. The effect of R:FR ratio on extension growth was independent of a low proportion of blue light. Very small amounts of blue light in the shadelight restricted leaf expansion in Anthocephalus and Bischofia, and increased specific stem length in the former. The climax species Hopea was relatively unresponsive to the R:FR ratios or the different proportions of blue light in the shadelight.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available