期刊
WATER
卷 13, 期 15, 页码 -出版社
MDPI
DOI: 10.3390/w13152059
关键词
Mekong River Basin; Tonle Sap Lake; Tonle Sap River; hydroclimate; tropical lake; Cambodia
资金
- USAID [AID-OAA-A-16-00057]
The study investigated the long-term dynamics of water quality in the Tonle Sap lake-river floodplain ecosystem over 22 years, revealing variations in most water quality parameters, with pH and nitrate remaining constant. Changes in the chemical nutrient ratio indicated that nitrogen may be the primary limiting nutrient. Water quality was found to be strongly influenced by watershed development, climate, and changes in water level.
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.
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