Soil Physicochemical Properties Data in Bornean Tropical Heath Kerangas Forests Invaded by Acacia mangium

This dataset contains collected data from a research project on the impact of the invasive alien tree species Acacia mangium Willd. on nutrient-poor sandy soils in tropical heath Kerangas forests, an increasingly threatened lowland forest in Brunei Darussalam, Borneo. Soil samples were collected in 2015 from three selected habitats: intact Kerangas forest, Acacia-invaded Kerangas forest, and Acacia mangium plantation. In each plot, eight soil cores were collected in the topsoil (0 - 15 cm) and subsoil (30 - 50 cm) layers, and soil parameters such as gravimetric water, organic matter content, texture, nutrient concentrations of nitrogen (N), phosphorus (P), potassium (K), magnesium (Mg) and calcium (Ca), exchangeable Mg, Ca, K, available P, and pH were documented. Sampling and analysis were performed according to standard protocols.