Author ORCID Identifier
Savoeurn Soum https://orcid.org/0000-0001-5939-3732
Peng Bun Ngor https://orcid.org/0000-0002-3659-6577
Sarah E. Null https://orcid.org/0000-0001-7451-7908
Flavia Tromboni https://orcid.org/0000-0001-7287-8048
Bunyeth Chan https://orcid.org/0000-0001-9102-5534
Mekong River Basin, Tonle Sap Lake, Tonle Sap River, hydroclimate, tropical lake, Cambodia
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This work is licensed under a Creative Commons Attribution 4.0 License.
Tonle Sap lake-river floodplain ecosystem (TSE) is one of the world’s most productive freshwater systems. Changes in hydrology, climate, population density, and land use influence water quality in this system. We investigated long term water quality dynamics (22 years) in space and time and identified potential changes in nutrient limitation based on nutrient ratios of inorganic nitrogen and phosphorus. Water quality was assessed at five sites highlighting the dynamics in wet and dry seasons. Predictors of water quality included watershed land use, climate, population, and water level. Most water quality parameters varied across TSE, except pH and nitrate that remained constant at all sites. In the last decade, there is a change in the chemical nutrient ratio suggesting that nitrogen may be the primary limiting nutrient across the system. Water quality was strongly affected by development in the watershed i.e., flooded forest loss, climatic variation, population growth, and change in water level. Seasonal variations of water quality constituents were driven by precipitation and hydrology, notably the Mekong’s distinct seasonal flood pulse.
Soum, S.; Ngor, P.B.; Dilts, T.E.; Lohani, S.; Kelson, S.; Null, S.E.; Tromboni, F.; Hogan, Z.S.; Chan, B.; Chandra, S. Spatial and Long-Term Temporal Changes inWater Quality Dynamics of the Tonle Sap Ecosystem. Water 2021, 13, 2059. https:// doi.org/10.3390/w13152059