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F. A. Mohd Hatta¹, PhD, and R. Othman²
¹Institute of Islam Hadhari, The National University of Malaysia, Bangi, Selangor Darul Ehsan, Malaysia
²Herbarium Unit, Department of Landscape Architecture, Kulliyyah of Architecture and Environmental Design, International Islamic University Malaysia, Kuala Lumpur, Malaysia
Part of the book: Advantages and Disadvantages of Sandy Soils
The composition and structure of a forest ecosystem are strongly attributed to changes in topography and soil factors. Heath forest can be regarded as a national landscape that must be safeguarded and protected from the current rapid development. Once the heath forest canopy is lost, the soils of heath forests quickly degrade to bleached sand, making this form of forest particularly vulnerable. Heath forest grows on podzolised siliceous sand (spodosols) drained by unique blackwater streams. The soil has an unstable soil structure and profile that is described as ashy grey, acidic, and has a heavily leached surface layer which leads to nutrient leaching. Hence, only certain plants can adapt and thrive to such extreme conditions. However, information on flora diversity and biomass in heath forests is still poorly explored and insufficient in comparison to other forest types, especially the relationship between plant diversity and habitat heterogeneity. Melaleuca cajuputi is the major species in Terengganu, whereas Casuarina nobilis and Calophyllum incrassatum are the dominant species in Sarawak’s heath forest. Allelopathy can be produced uniquely by most heath forest plants via secondary metabolites chemical mixtures or phytotoxins. Carnivorous syndrome features can be observed in the vegetation of heath forests. Nepenthes sp., Drosera sp., Utricularia sp., Hanguana malayana, Lepironia articulata, Eriocaulon sexangulare, Dapsilanthus disjunctus and Eleocharis ochrostachys are amongst the species typically found with special plant mechanisms. However, this ecosystem is necessitating prompt conservation intervention. Identification of flora on sandy soils is an initiative to discover potential seedlings for heath forest restoration.
Keywords: sandy soil, harsh condition, plant mechanisms, allelopathy, carnivorous
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