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首页> 外文期刊>Water, air and soil pollution >Impact of Water Level Fluctuation on Sediment and Phosphorous Dynamics in Tonle Sap Lake, Cambodia
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Impact of Water Level Fluctuation on Sediment and Phosphorous Dynamics in Tonle Sap Lake, Cambodia

机译：水位波动在柬埔寨沉积物沉积物和磷动力学的影响

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摘要

Water level variation substantially affects the trophic levels in a lake. The primary objective of this research is to investigate the impact of water level fluctuation on sediment and phosphorous (P) dynamics in Tonle Sap Lake (TSL), Cambodia. Water samples were collected from eight cross sections in a lake at 3-month intervals for 3 years, during the low-water period (March and June) and high-water period (September and December) from December 2016 to June 2019. Water quality parameters-temperature, conductivity, salinity, dissolved oxygen, pH, oxidation reduction potential, chlorophyll-a (Chl-a), and blue green algae-were measured using an EXO(R) sensor. The sedimentation and resuspension rates of the sediment were measured using a sediment trap. Sediments were collected during the low-water period of March 2017. The sediment resuspension condition was simulated via centrifugation (150 rpm, end-to-end mechanical shaker, room temperature 25 degrees C for 24 h) to assess phosphorous dynamics. The P content in the bed sediment was fractionated to obtain loosely bound, metal oxide bound, apatite bound, and organic bound P. Sediment resuspension was greater during the low-water period ( 1 m) than that during the high-water period ( 4.8 m). The sites exhibited significant variation (p 0.05) in terms of dissolved oxygen, pH, oxidation-reduction potential, Chl-a, and depth during low- and high-water periods. In general, the Chl-a concentration throughout the sampling campaigns ranged between 1.7 and 9.0 mu g/L, suggesting the existence of a mesotrophic state in the TSL. The zero equilibrium P concentration of sediment in TSL was greater when the sediment was under the resuspension condition (18.9 +/- 3.0 mu g/L) than under the static condition (7.7 +/- 1.1 mu g/L). In TSL, during resuspension (low-water) conditions, sediments act as a source and release P (apatite bound, loosely bound, metal oxide bound, and soluble reactive P). However, in static (high-water) conditions, sediments act as a sink by adsorbing P from the overlying water.Graphical abstract
机译：水位变异显着影响湖中的营养水平。本研究的主要目标是调查水位波动在柬埔寨TSLAP（TSL）中沉积物和磷（P）动力学的影响。在2016年12月至2019年6月到2019年6月，在低水期（3月和6月）和高水期（9月和12月）期间，在3个月间隔为3个月间隔，从湖中的八个横截面收集水样。水质使用EXO（R）传感器测量参数 - 温度，电导率，盐度，溶解氧，pH，氧化还原电位，叶绿素-A（CHL-A）和蓝绿藻。使用沉积物陷阱测量沉积物的沉降和重悬浮率。在2017年3月的低水期间收集沉积物。通过离心（150rpm，端到端的机械振荡器，室温25摄氏度24小时，24小时）模拟沉积物重新悬浮条件以评估磷动力学。分离床沉积物中的P含量，得到松散的结合，金属氧化物结合，磷灰石结合和有机结合的P.沉积物重悬浮在低水期（＆LT; 1米）期间更大（＆ 4.8米）。在低水平和高水平期间，该部位在溶解的氧，pH值，氧化还原电位，CHL-A和深度方面表现出显着的变化（P <0.05）。通常，在整个采样运动中的CHL-A浓度范围为1.7和9.0μg/ L，表明TSL中的脑养护状态的存在。当沉淀物在重悬浮条件下（18.9 +/-3.0μg/ L）下方的沉积物（7.7 +/-1.1μg/ l）下，TSL中沉淀物的零平衡P浓度更大。在TSL中，在重新悬浮（低水解）条件下，沉积物作为源和释放P（磷灰石结合，松散束缚，金属氧化物结合，可溶性反应性P）。然而，在静态（高水）条件下，沉积物通过吸附来自上覆的水的P.Graphication摘要

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