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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology
Sridith, Kitichate
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary

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REMNANT OF THE DRYLAND COASTAL VEGETATION OF THE SONGKHLA LAKE BASIN, SONGKHLA, THAILAND Cheechang, Anusit; Sridith, Kitichate
BIOTROPIA Vol. 32 No. 3 (2025): BIOTROPIA Vol. 32 No. 3 December 2025
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2025.32.3.2514

Abstract

HIGHLIGHTSThis article identifies and characterizes three native plant communities in the Songkhla Lake Basin, highlighting their distinct species composition, coastal zonation patterns, and ecological value. It reveals high plant diversity across remnant dryland coastal habitats and documents key native species that define each community type. The study emphasizes the negative impacts of human activity and land policies on native vegetation and offers baseline floristic data that support conservation, ecological restoration, and sustainable land-use planning.ABSTRACTThe remnant dryland coastal vegetation of the Songkhla Lake Basin, Songkhla, Thailand, was investigated in this study. Twenty vegetation plots were established to represent each vegetation subtype. Using Braun-Blanquet cluster analysis and the Jaccard similarity index, the vegetation was classified into three distinct communities: (1) the Coastal Woodland Community, located farthest inland and dominated by Dipterocarpus alatus Symington; (2) the Coastal Scrub-Shrubby Tree Community, situated inland from the coastal zone, with Dipterocarpus chartaceus Symington, Neolitsea zeylanica (Nees & T. Nees) Merr., and Psychotria asiatica L. identified as dominant species; and (3) the Coastal Scrub Community, occurring near the shoreline and characterized by densely clustered vegetation dominated by Mischocarpus sundaicus Blume, Planchonella obovata (R.Br.) Pierre, and Vitex pinnata L. Vegetation profiles for each community were delineated. Significant degradation and decline of native plant communities in the Songkhla Lake Basin have been caused by conservation activities involving the introduction of fast-growing non-native species and by governmental land tax policies.
PLANT SPECIES COMPOSITION OF THE FLOODPLAIN VEGETATION IN THE SONGKHLA LAKE BASIN Cheechang, Anusit; Sridith, Kitichate
BIOTROPIA Vol. 33 No. 1 (2026): BIOTROPIA Vol. 33 No. 1 January 2026
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11598/btb.2026.33.1.2592

Abstract

ARTICLE HIGLIGHTS- Floodplain vegetation in the Songkhla Lake Basin comprises 109 vascular plant species grouped into five community types.- Inundation depth and human disturbance are the main factors shaping plant community composition.- The flora is dominated by perennial terrestrial and helophytic (marsh) plants.- Human activities accelerate secondary succession in floodplain areas.- This process causes a decline of rare native species.- Urgent conservation measures are needed to protect native plants and maintain aquatic refugia.ABSTRACTThis study examined plant diversity in the threatened Songkhla Lake Basin floodplain, a vital yet degrading wetland. Carried out from September 2022 to January 2024 across ten plots using the Braun-Blanquet method and cluster analysis, the research aimed to document floristic composition, identify influencing factors, and assess the conservation status. As many as 109 vascular plant species (91 genera, 55 families) were identified in this study, mainly represented by Poaceae and Cyperaceae. Perennial terrestrial plants (64%) and helophytes (24.2%) were dominant. Five distinct vegetation communities were classified based on inundation depth. Results showed that human disturbances, such as agriculture and irrigation, speed up secondary succession, resulting in permanent habitat loss, decline of rare native species, and increased invasion by alien species. The findings emphasized an urgent need to conserve these remaining floodplain ecosystems.
Co-Authors Cheechang, Anusit