Plant diversity study in forest reserves with ultramafic habitats in Sabah, Malaysia
2015
Sugau, John B. | Nur Adillah Mohd Yusof
A study on the plant diversity was conducted for 10 Forest Reserves with ultramafic habitats in Sabah, namely Bidu-Bidu FR, Bukit Hampuan FR, Bukit Tawai FR, Danum Valley FR (Mt. Nicola), Gunung Tinkar FR, Sakar Island FR, Sapagaya FR (Mt. Silam), Sempilor Malawali FR, Sg Imbak FR and Ulu Tungud FR (Meliau Range). The data was gathered from recent and past botanical expeditions and surveys. Ultramafic forestdevelops on soil which is derived from ultramafic rocks. Ultramafic rocks are widespread and extensive in Sabah (Malaysia) covering an area of approximately 3500 km2. Ultramafic soils are generally deficient in the essential macronutrients, phosphorus and potassium, have high magnesium/calcium ratios and high concentrations of potentially phytotoxic nickel. This is one of the factors often cited as defining for the structure and species composition in ultramafic forests. Of the estimated 8000 species of vascular plants in Sabah, 4252 species are recorded on ultramafic outcrops. The total number of plant species recorded from the ten forest reserves is 2673 with 653 endemic to Borneo including 145 Sabah endemics.
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