Papers by Kamziah Abd Kudus
... I would also like to extend my thanks to the supervisory committee members, Prof Dr. Nik Muha... more ... I would also like to extend my thanks to the supervisory committee members, Prof Dr. Nik Muhammad Nik Abd Majid, Assoc. Prof. Dr. Isa Daud and Dr. Awang Noor Abd. ... Mathematics and Dr. Jamaluddin Basharuddin for introducing Forest Biometrics to me. ...
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Thai Journal of Forestry, 2000
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Malayan Nature Journal
Logging operations have been known to highly influence the environment of tropical rain forest. T... more Logging operations have been known to highly influence the environment of tropical rain forest. The present study investigated the effect of supervised logging (SL) operations on tree composition and diversity of a hill dipterocarp forest (HDF) in Ulu Muda Forest Reserve, Kedah, Peninsular Malaysia. To describe the tree composition and diversity of the secondary HDF after SL, the compositional factors and diversity were analyzed. A plot of size 1-ha was established. All trees with diameter at breast height ≥ 1cm in 10 sub plots (50m × 20 m) were enumerated, measured and identified. In the study site, we recorded 891 individuals, belonging to 56 families, 158 genera, 296 species and one variety. Ten families provided 55.7% of the total species composition. Euphorbiaceae has the highest number of species and was followed by Lauraceae, Rubiaceae, Annonaceae and Meliaceae. With regards to relative dominance, Diplospora malaccensis (Euphorbiaceae) gave the highest importance value index ...
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Journal of Agricultural Science, 2011
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Journal of Forestry Research, 2014
ABSTRACT
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Journal of Agricultural Science, 2012
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Journal of Agricultural Science, 2011
... Journal of Tropical Ecology, 18, 499–525. doi:10.1017/S0266467402002341, http://dx.doi.org/ 1... more ... Journal of Tropical Ecology, 18, 499–525. doi:10.1017/S0266467402002341, http://dx.doi.org/ 10.1017/S0266467402002341 Faridah Hanum, I., Philip, L., Awang Noor, AG (2008). ... Leguminosae Fordia unifoliata (Prain) Dasuki & Schot Tree 328.21 9.87 338.08 ...
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Journal of Agricultural Science, 2010
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Journal of Agricultural Science, 2011
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Journal of Applied Statistics, 2006
ABSTRACT Survival times for the Acacia mangium plantation in the Segaliud Lokan Project, Sabah, E... more ABSTRACT Survival times for the Acacia mangium plantation in the Segaliud Lokan Project, Sabah, East Malaysia were analysed based on 20 permanent sample plots (PSPs) established in 1988 as a spacing experiment. The PSPs were established following a complete randomized block design with five levels of spacing randomly assigned to units within four blocks at different sites. The survival times of trees in years are of interest. Since the inventories were only conducted annually, the actual survival time for each tree was not observed. Hence, the data set comprises censored survival times. Initial analysis of the survival of the Acacia mangium plantation suggested there is block by spacing interaction; a Weibull model gives a reasonable fit to the replicate survival times within each PSP; but a standard Weibull regression model is inappropriate because the shape parameter differs between PSPs. In this paper we investigate the form of the non-constant Weibull shape parameter. Parsimonious models for the Weibull survival times have been derived using maximum likelihood methods. The factor selection for the parameters is based on a backward elimination procedure. The models are compared using likelihood ratio statistics. The results suggest that both Weibull parameters depend on spacing and block.
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Canadian Journal of Forest Research, 1999
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Journal of Agricultural Science, 2010
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Papers by Kamziah Abd Kudus