Abstract The research objective was to study temporal and spatial relations between specific phosphorus species as well as to examine total phosphorus content in the bottom sediments of an anthropogenic, hypertrophic limnic ecosystem Rybnik Reservoir, functioning under thermal pollution conditions. The chemical extraction procedure for the speciation of bioavailable phosphorus forms was used. It was found that available algae phosphorus was the most dominant phosphorus species in both sediment layers (83%), while the lower share was readily desorbed phosphorus form (0.1%). The phosphorus species concentrations depended on the organic matter concentration. The differences between phosphorus species contents in the upper (5 cm) and lower (15–20 cm) sediment core layers were low. The biologically active sediment layer extended from the sediment surface to at least 20 cm depth of the sediment core. Distributions of the concentrations within the year and at specific sampling points resulted from the variability observed for particular points and transformation intensity. Furthermore in the following study, the reaction rate constant for the increase and decrease in the concentrations of the phosphorus species in sediments was given. It was indicated that the speed of the phosphorus species transformations was affected by the environment temperature. In the heated water discharge zone (water temp. 17–35°C) the concentrations of selected speciation phosphorus forms increased more than in the dam zone (5–25°C). It was also found that the abundance of the bottom sediments with phosphorus species was related to the oblong and transverse asymmetry of reservoir depth.

中文翻译：

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大坝水库热污染条件下磷物质浓度的时空变化——雷布尼克水库案例研究

摘要 研究目标是研究特定磷种类之间的时间和空间关系，并检查在热污染条件下运行的人为肥厚湖泊生态系统 Rybnik 水库底部沉积物中的总磷含量。使用了生物可利用磷形态的化学提取程序。发现有效藻类磷是两个沉积层中最主要的磷种类 (83%)，而较低的份额是容易解吸的磷形式 (0.1%)。磷物质浓度取决于有机物浓度。上部 (5 cm) 和下部 (15-20 cm) 沉积物核心层中磷物质含量之间的差异很小。生物活性沉积层从沉积物表面延伸到沉积物核心的至少 20 厘米深度。年内和特定采样点的浓度分布是由观察到的特定点和转化强度的变异性引起的。此外，在接下来的研究中，给出了沉积物中磷物质浓度增加和减少的反应速率常数。表明磷物种转化的速度受环境温度的影响。在热水排放区（水温 17–35°C），选定的物种形成磷形式的浓度比坝区（5–25°C）增加得更多。