Article Per Year (5 Year)
p-Index From 2020 - 2025
0.408
P-Index
This Author published in this journals
All Journal REINWARDTIA Reinwardtia ASEAN Journal for Science and Engineering in Materials
Jaafar, Salwana
Unknown Affiliation
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Education Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Impact of road construction on tree diversity and forest structure in an intact Bornean mixed dipterocarp forest Ideris, Nur; Jaafar, Salwana; Sukri, Rahayu
Reinwardtia Vol. 24 No. 1 (2025): Reinwardtia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/reinwardtia.2025.592

Abstract

IDERIS, N. K. H, JAAFAR, S. MD. & SUKRI, R. S. 2025. Impact of road construction on tree diversity and forest structure in an intact Bornean mixed dipterocarp forest. Reinwardtia 24(1): 1–15. — Road construction has previously been shown to negatively impact biodiversity and is an urgent threat to Bornean tropical forests. We investigated changes in tree species diversity and forest structure of the Andulau Forest Reserve in Brunei Darussalam, following the construction of the Telisai-Lumut Highway. Within nine 20 × 20 m plots set up at varying distances from the forest edge where the road was located, we measured all trees ≥ 1 cm in diameter at breast height for their stem diameter, height and crown characteristics, and identified all trees ≥ 5 cm dbh. Although mean tree abundance and diversity between plots were similar, we detected significant differences in forest structure, particularly stem diameter, basal area, and crown characteristics. Plots closest to the road recorded the highest total tree species richness, although not significant, and contained a mixture of pioneer tree species and remnant interior forest species, while no pioneers were recorded in the interior forest plots. We documented the presence of high conservation value species, including three critically endangered species (Gonystylus bancanus, Hopea micrantha, and Vatica venulosa). Our work illustrates the potential impacts on forest structure from road construction and highlights the need for further studies to assess the long-term impacts on tree diversity and forest dynamics.
Impact of road construction on tree diversity and forest structure in an intact Bornean mixed dipterocarp forest Ideris, Nur; Jaafar, Salwana; Sukri, Rahayu
Reinwardtia Vol. 24 No. 1 (2025): Reinwardtia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/reinwardtia.2025.592

Abstract

IDERIS, N. K. H, JAAFAR, S. MD. & SUKRI, R. S. 2025. Impact of road construction on tree diversity and forest structure in an intact Bornean mixed dipterocarp forest. Reinwardtia 24(1): 1–15. — Road construction has previously been shown to negatively impact biodiversity and is an urgent threat to Bornean tropical forests. We investigated changes in tree species diversity and forest structure of the Andulau Forest Reserve in Brunei Darussalam, following the construction of the Telisai-Lumut Highway. Within nine 20 × 20 m plots set up at varying distances from the forest edge where the road was located, we measured all trees ≥ 1 cm in diameter at breast height for their stem diameter, height and crown characteristics, and identified all trees ≥ 5 cm dbh. Although mean tree abundance and diversity between plots were similar, we detected significant differences in forest structure, particularly stem diameter, basal area, and crown characteristics. Plots closest to the road recorded the highest total tree species richness, although not significant, and contained a mixture of pioneer tree species and remnant interior forest species, while no pioneers were recorded in the interior forest plots. We documented the presence of high conservation value species, including three critically endangered species (Gonystylus bancanus, Hopea micrantha, and Vatica venulosa). Our work illustrates the potential impacts on forest structure from road construction and highlights the need for further studies to assess the long-term impacts on tree diversity and forest dynamics.
Hydrological Drainage Effects on Microbial Dynamics in Badas Peatland: Fungal Decline, Bacterial Dominance, and Reduced Microbial Biomass Carbon Sahat, Muhammad Hadi; Sukri, Rahayu Sukmaria; Jaafar, Salwana; Shivanand, Pooja; Gödeke, Stefan
ASEAN Journal for Science and Engineering in Materials Vol 5, No 2 (2026): AJSEM: Volume 5, Issue 2, September 2026
Publisher : Bumi Publikasi Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Peatlands are globally important ecosystems for carbon storage and climate regulation, yet hydrological drainage for agriculture and infrastructure has disrupted their ecological balance. This study examined the effects of drainage on soil microbial communities and microbial biomass carbon (MBC) in Badas Peatland, Brunei Darussalam. Soil samples were collected along two transects (Jalan Badas Middle and North) and analyzed using microBIOMETER® and plate count methods. Results revealed that fungal abundance and MBC increased with distance from the drainage canal, whereas bacterial and actinomycete counts decreased. The fungal-to-bacterial ratio showed a strong positive correlation with MBC, indicating that drainage adversely affects fungal populations and soil carbon retention. These findings highlight that fungi are more sensitive to drainage-induced stress than bacteria, reducing the peatland’s capacity for carbon sequestration. The study emphasizes the need for sustainable water management strategies to preserve soil microbiology and mitigate carbon loss from tropical peatlands.
Co-Authors Gödeke, Stefan Ideris, Nur Rahayu Sukmaria Sukri, Rahayu Sukmaria Sahat, Muhammad Hadi Shivanand, Pooja Sukri, Rahayu