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This paper focused on the quality of groundwater at the ex-promontory-land of Carey Island to study agricultural impacts on groundwater aquifers. Groundwater quality was measured regularly by using ion chromatography from November 2010 to April 2012. High amount of ammonium-nitrogen(NH4-N) ~ 36.06 mgL , nitrate-nitrogen (NO3-N) ~ 33.82 mgL , phosphate ions (PO4 ) ~ 18.03mgLand potassium ions (K) ~ 151.77 mgLwere found in the groundwater indicating the impact of fertilizers application on the land formore a century period. Other physical parameters such as water temperature,groundwater table, total dissolved solids (TDS), pH, and electrical conductivity (EC) were also determined to trace out the groundwater quality trends. It is found that the difference in groundwater quality based on unconfined and semi-confined aquifers was not significant. Cluster analysis (CA), principal component analysis (PCA) and multivariate analysis (ANOVA) were employed to characterize the hydrogeochemical of the groundwater. Three clusters are developed according to the water quality variables and the loadings feature in PCA confirms the factors of groundwater contamination.

Effects of long-term mixed land use of human settlement and oil palm plantation on the groundwater quality of ex-promontory land