Use this URL to cite or link to this record in EThOS:
Title: Differentiation of Dipterocarp floristic composition and species distributions in Brunei Darussalam
Author: Haji Sukri, Rahayu Sukmaria
ISNI:       0000 0004 2700 5565
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2010
Availability of Full Text:
Access from EThOS:
Full text unavailable from EThOS. Please try the link below.
Access from Institution:
This thesis investigates the influence of niche specialisation on floristic composition and species distributions of the family Dipterocarpaceae along topographic gradients at two contrasting lowland Mixed Dipterocarp Forest sites in Brunei Darussalam: Andulau (overlying nutrient-poor sandy soils) and Belalong (overlying nutrient-rich clay soils). Dipterocarp tree density, species richness and diversity were higher at Andulau than Belalong, and were also higher on ridges than in slopes and valleys. Randomisation tests detected significant dipterocarp species associations with site and tomography. Dipterocarp floristic composition was strongly correlated with various habitat variables at Belalong, even after accounting for distance between samples. In contrast, fewer habitat variables were correlated with dipterocarp floristic composition at Andulau, implying weaker habitat effects in this more topographically homogeneous site. In a field-based transplant experiment, Dryobalanops aromatica and Dryobalanops rappa seedlings consistently showed higher growth rates and survival in gaps than in understorey plots. Higher survival and leaf production of D. aromatica seedlings at Andulau than Belalong provide evidence of a habitat preference. Growth and survival of D. rappa seedlings were similar at the two sites, but D. rappa seedlings grew significantly faster in height than D. aromatica seedlings on slopes at both sites. In conclusion, local and landscape scale variations in edaphic and environmental resources influence dipterocarp species distributions and floristic composition, as well as dipterocarp seedling growth and survival. Thus, niche specialisation is an important mechanism in the maintenance of species coexistence at Andulau and Belalong.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Forests and forestry ; Dipterocarpaceae