Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/156464
Title: NATURALLY ACIDIC OR ANTHROPOGENICALLY ACIDIFIED? UNCOVERING THE DRIVERS OF STREAM ACIDITY DURING STORMFLOW IN THE NEE SOON CATCHMENT, SINGAPORE
Authors: KOH YAN TING RACHEL
Keywords: Acid deposition, Episodic stream acidification, Acid-neutralizing capacity, Base cation surplus, Base cation depletion, Nee Soon Catchment
Issue Date: 18-Jan-2019
Citation: KOH YAN TING RACHEL (2019-01-18). NATURALLY ACIDIC OR ANTHROPOGENICALLY ACIDIFIED? UNCOVERING THE DRIVERS OF STREAM ACIDITY DURING STORMFLOW IN THE NEE SOON CATCHMENT, SINGAPORE. ScholarBank@NUS Repository.
Abstract: Episodic acidification occurs as periods of high flow temporarily reduce the streams’ acid neutralizing capacity (ANC). In Singapore, the acidification of streams in the Nee Soon Swamp Forest (NSSF) is thought to have deleterious impacts on aquatic ecosystems. This research aims to understand potential mechanisms responsible for episodic acidification in the Nee Soon Catchment (NSC). Five streams were selected in the NSC. The pH and major ions in precipitation, throughfall and shallow groundwater and streamwater samples were analysed. Soil cores were collected for analysis of pH, particle size distribution, organic matter content, effective cation exchange capacity (ECEC) and base saturation (BS). During storm flow, all streams experienced a decrease in ANC as the concentration of nitrate and sulfate increased. BS of the soils was low, indicating that soil exchangeable acidity may increase and contribute to further stream acidification. The results suggest that stream acidification in the NSC is primarily driven by the flushing of previously deposited acid anions through the soil and into the streams during storm events.
URI: https://scholarbank.nus.edu.sg/handle/10635/156464
Appears in Collections:Master's Theses (Open)

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