TY - CHAP
T1 - Nutrient Availability and Phosphorus Dynamics
AU - Sovannara, Uk
AU - Kodikara, Dilini
AU - Hashimoto, Kana
AU - Vouchlay, Theng
AU - Mong, Marith
AU - Siev, Sokly
AU - Sok, Ty
AU - Try, Sophal
AU - Kaing, Vinteang
AU - Khanal, Rajendra
AU - Yang, Heejun
AU - Seav, Thea
AU - Oeurng, Chantha
AU - Yoshimura, Chihiro
N1 - Publisher Copyright:
© The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2022.
PY - 2022/1/1
Y1 - 2022/1/1
N2 - This chapter presents the availability of phosphorus (P) and nitrogen (N) and P dynamics in Tonle Sap Lake (TSL) in relation to flood pulse. The nutrient concentrations in TSL generally peak during the low-water period and gradually decreasing as the water depth increases with annual hysteresis in response to water level. The observation in 1995–2010 at Kampong Luong reveals that total P (TP) concentration ranges greatly from 1 to 990 μg/L (average 95 μg/L), dissolved inorganic N from 13 to 3144 μg/L (297 μg/L), nitrate + nitrite from 1 to 2100 μg/L (210 μg/L), and ammonium from 4 to 350 μg/L (84 μg/L). The ratio of dissolved inorganic nitrogen to dissolved inorganic phosphorus (molar basis) ranged from 0.4 to 4730 (average 129), and 88% of the data were higher than the Redfield ratio, indicating P limitation in most of the time in TSL. Sedimentary TP content in TSL ranged from 497 to 1481 mg/kg-dry mass, with inorganic P as its major fraction (average 66%). The annual influx of TP to TSL and outflux from TSL via Tonle Sap River were estimated to be 6428 ton/year and 3025 ton/year, respectively, in average between 1998 and 2003. The mass balance implies the retention of TP in the lake being approximately 3305 ton/year (54% of the influx).
AB - This chapter presents the availability of phosphorus (P) and nitrogen (N) and P dynamics in Tonle Sap Lake (TSL) in relation to flood pulse. The nutrient concentrations in TSL generally peak during the low-water period and gradually decreasing as the water depth increases with annual hysteresis in response to water level. The observation in 1995–2010 at Kampong Luong reveals that total P (TP) concentration ranges greatly from 1 to 990 μg/L (average 95 μg/L), dissolved inorganic N from 13 to 3144 μg/L (297 μg/L), nitrate + nitrite from 1 to 2100 μg/L (210 μg/L), and ammonium from 4 to 350 μg/L (84 μg/L). The ratio of dissolved inorganic nitrogen to dissolved inorganic phosphorus (molar basis) ranged from 0.4 to 4730 (average 129), and 88% of the data were higher than the Redfield ratio, indicating P limitation in most of the time in TSL. Sedimentary TP content in TSL ranged from 497 to 1481 mg/kg-dry mass, with inorganic P as its major fraction (average 66%). The annual influx of TP to TSL and outflux from TSL via Tonle Sap River were estimated to be 6428 ton/year and 3025 ton/year, respectively, in average between 1998 and 2003. The mass balance implies the retention of TP in the lake being approximately 3305 ton/year (54% of the influx).
UR - http://www.scopus.com/inward/record.url?scp=85160483123&partnerID=8YFLogxK
U2 - 10.1007/978-981-16-6632-2_24
DO - 10.1007/978-981-16-6632-2_24
M3 - 章
AN - SCOPUS:85160483123
SN - 9789811666315
SP - 241
EP - 250
BT - Water and Life in Tonle Sap Lake
PB - Springer Nature
ER -