Kamziah Abd Kudus

• UPM

Mitigating climate change requires the identification of tree species that can tolerate water stress with fewer negative impacts on plant productivity. Therefore, the study aimed to evaluate the water stress tolerance of young saplings of C. erectus and M. alba under three soil water deficit treatments (control, CK, 90% field capacity, FC, medium s...

Low water availability predicted under climate change is a major abiotic factor limiting plants growth and productivity. In this study a greenhouse experiment was conducted on three important tree species of arid environment: Conocarpus erectus (CE), Acacia modesta (AM), and Salix tetrasperma (ST). Young saplings were subjected to control (C), medi...

The Juniper forest reserve of Ziarat is one of the biggest Juniperus forests in the world. This study assessed the land-use changes and carbon stock of Ziarat. Different types of carbon pools were quantified in terms of storage in the study area in tons/ha i.e., above ground, soil, shrubs and litter. The Juniper species of this forest is putatively...

Planning for forest management depends upon the forest dynamics, which includes integration of all forest disciplines and understanding of forest resource characteristics including its growth dynamics. The forest growth and yield modelling can provide valuable information about forestry which can be used to determine harvest levels or allowable cut...

Taman Rimba Alam (TRA), Putrajaya is a metropolitan recreational park with an area of 160 ha planted with various tropical forest species. Although TRA is a man-made forest, it serves and functions as any other natural forest especially for the well-being of people in urban area. In order to ensure that TRA could functions as it has been envisaged,...

Multi-elemental and isotopic fingerprints could help to track changes in mangrove forest productivity and development. This study aims to identify elemental concentrations and stable isotope ratios in inter- and intra-mangrove species along the inundation gradient of the Matang mangrove forest. Matured sun leaves of different mangrove species, name...

Taman Rimba Alam (TRA), Putrajaya is a metropolitan recreational park with an area of 160 ha planted with various tropical forest species. Although TRA is a man-made forest, it serves and functions as any other natural forest especially for the well-being of people in urban area. In order to ensure that TRA could functions as it has been envisaged,...

Soil, forest and atmosphere are potential carbon storage in the terrestrial ecosystem. However, little is known regarding the carbon storage of this ecosystem, particularly belowground. This study was conducted in the Marudu Bay mangrove forest, Sabah with the aim of quantifying carbon storage in soil for four dominant species in the study area. A...

Knowledge on soil recovery in hill dipterocarp forests after logging is of importance for the management of forests. Samples of soils 14-years after supervised logging (SLo) and 16-years after conventional logging (CL) in a hill dipterocarp forest (HDF) at Ulu Muda Forest Reserve, Kedah were evaluated for their physico-chemical properties, soil fer...

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...

Fungi are often used to induce agarwood in Aquilaria trees. This study was conducted to evaluate the effect of several fungi on agarwood formation over time in young Aquilaria malaccensis (Lam.) trees. Typical changes in the length and light intensity of the resulting discoloration were observed after three and six month periods following inoculati...

A study on community structure of trees >1cm Dbh was conducted in Ayer Hitam Forest Reserve (AHFR), Puchong Selangor, Malaysia. AHFR is one of the three remaining forests left in the Klang Valley and it is the only logged-over lowland Dipterocarp forest in urban settings. The aim of this study was to describe the tree community structure through st...

The mangroves of Marudu Bay in the state of Sabah is situated at the tip of Borneo Island, and at the southern limit of the Coral Triangle whose waters hold the highest diversity of corals, fish, molluscks, crustaceans and marine plant species in the world. The ecosystem shows a deterioration due to unsustainable fishing, pollution and encroachment...

Species diversity and density of all climbers were inventoried in five 1-hectare plots (at 45m to 350 m elevations) in a coastal hill forest of Pulau Pangkor in Perak. In addition, we analyzed pattern of community diversity using species richness and evenness. Total of 4901 climbers belonging to 45 species were recorded. Mean climber density was 87...

Recent studies in many countries had display the influence of many factors including: Satisfaction, Knowledge, Demographic and Attitudinal variables in level of people participation. The main question here is, whether these factors would also be effective on people participation in Iran? The purpose of this research was to investigate communication...

The present study was carried out to analyze the species diversity and quantitative analysis of mangrove forest in three riverine ecosystems at River Kisap, River Ayer Hangat and River Kilim at Kilim Geoforest Park. One hundred plots, each of size 20 m × 20 m, were established at a distance of 250 m apart along the three rivers. Every existing spec...

Vascular plant species and diversity of a coastal hill forest in Sungai Pinang Permanent Forest Reserve in Pulau Pangkor at Perak were studied based on the data from five one hectare plots. All vascular plants were enumerated and identified. Importance value index (IVI) was computed to characterize the floristic composition. To capture different as...

The quantitative assessment of the hill logged-over forest at Tekai Tembeling Forest Reserve (TTFR) Jerantut, Pahang, Malaysia has never been investigated by the Forestry Department in the State of Pahang. This study investigated tree species diversity at 340-520 m asl. A one-ha (100m x 100m) study plot was established and trees with diameter at br...

A nonlinear regression approach is proposed to estimate the parameters of the Johnson SB distribution. This method was compared to five other methods; these were the four percentile points method, the Knoebel-Burkhart method, the linear regression method, the maximum likelihood (Newton-Raphson) method, and the modified maximum likelihood method thr...

This study was carried out to determine the appropriate growth model for Swietenia macrophylla plantation at Luang Manis, Kolapis, Sabah. It included exploratory data analysis, development of survival and growth prediction models, basal area estimation and model comparison to determine the most appropriate model to predict the optimum age for harve...

The study was carried out to analyze the species diversity and study of quantitative analysis of medicinal plantsin logged over forest in Tekai Tembeling Forest Reserve (TTFR). Four plots of 1-hectare size each wereestablished within the forest area. A total of 6788 individual medicinal trees and non trees representing 231species, 179 genera and 87...

Plant species diversity of a logged-over coastal forest within the Pasir Tengkorak Forest Reserve, Langkawi Island,Malaysia was assessed by establishing a 1-ha plot. All plants above 1.0 cm dbh (diameter of a tree at breast height), or4.5 feet above ground level, the accepted point of diameter measurement for most trees were enumerated. Speciesdive...

Dipterocarp forests are of vital economic and ecological importance in Peninsular Malaysia. Despite their economic importance, dipterocarp forests have been greatly depleted. The Selective Forest Management System (SMS) was introduced in 1978 and is the current forest-management system practiced. The SMS is designed to optimize the management objec...

The future long-term timber supply from sustainably managed forests in Peninsular Malaysia is largely dependant on the availability of timber from the productive Permanent Forest Estate, particularly from the hill dipterocarps forests. Since little virgin forest of this kind remain, much of the future log-production will come from the second and su...

Growth models can contribute to the forest management decision making process by providing stand development forecasts. Mahogany plantation in Gum-Gum Forest Reserve Sabah was planted in 1968 with spacing 2.74 × 2.74m within an area of 0.52 hectare. Diameter at breast height (dbh) and tree height data were collected from year 1969 to 2006. This stu...

This study was carried out to apply survival analysis in the development of stand density prediction models. Initial analysis on the survival data suggested that a Weibull model gave reasonable fit to the replicate survival times and a standard Weibull regression model was inappropriate because the shape parameter differs between permanent sample p...

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...

Five distributions, Weibull, gamma, Johnson SB, log normal and generalised normal, are compared in terms of their ability to model diameter data in even-aged and uneven-aged forest stands. Moments ratio diagrams of various statistical distributions are applied as a measure of the flexibility of the distribution in regard to their changes in shape....

A nonlinear regression approach is proposed to estimate the parameters of the Johnson SB distribution. This method was compared to five other methods; these were the four percentile points method, the Knoebel-Burkhart method, the linear regression method, the maximum likelihood (Newton-Raphson) method, and the modified maximum likelihood method thr...

Tree species composition and structure of a coastal hill forest in Sungai Pinang Permanent Forest Reserve in Pulau Pangkor at Perak was studied based on the data from five 1-hectare plots. All stems with a diameter at breast height (dbh) ≥ 5cm enumerated, identified and their height weremeasured. The mean stem density was 659 (stems ha -1), and a t...