State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
Environ Monit Assess. 2011 Aug;179(1-4):335-45. doi: 10.1007/s10661-010-1740-9. Epub 2010 Oct 27.
Sediment phosphorus (P) fractions and sorption characteristics and P release from intact sediment cores of Baiyangdian Lake in North China in spring 2009 were investigated. Results of chemical fractionation showed that total P (TP) content in sediment ranged from 443 to 611 mg kg( -1). Of the P fractions including inorganic P (IP) and organic P (OP), IP was a dominant component of TP and present in the form of P bounded to calcium (Ca-P) while the bioavailable P content bounded to Al, Fe, and Mn oxides and hydroxides (Fe/Al-P) varied from 14 to 102 mg kg( -1). The batch experiments showed that the sediments had appreciable maximum P adsorption capacity from 141.86 to 377.37 mg kg( -1). However, the zero P equilibrium concentration (C⁰(eq))in most sampling sites was larger than the P concentration in water column. Accordingly, the sediments from those sampling sites would release P into the overlying water at the positive P flux rates as a P release source. Significant positive correlation between P flux rates and Fe/Al-P revealed that the sediment P release would mainly originate from the bioavailable P fraction. It is evident that the inherent phosphorus present in lake sediments would be a major threat to the water quality and ecosystem reservation in Baiyangdian lake.
2009 年春季，对中国北方白洋淀湖完整沉积物芯中的沉淀磷 (P) 形态和吸附特性以及 P 的释放进行了研究。化学分级结果表明，沉积物中的总磷 (TP) 含量范围为 443 至 611mgkg(-1)。在包括无机磷 (IP) 和有机磷 (OP) 的 P 形态中，IP 是 TP 的主要成分，以与钙结合的形式存在 (Ca-P)，而与 Al、Fe 和 Mn 氧化物和氢氧化物结合的生物可利用磷含量 (Fe/Al-P) 则从 14 到 102mgkg(-1) 不等。批量实验表明，沉积物具有可观的最大磷吸附容量，从 141.86 到 377.37mgkg(-1)。然而，在大多数采样点，零 P 平衡浓度 (C⁰(eq)) 大于水柱中的 P 浓度。因此，来自这些采样点的沉积物将以正 P 通量率释放 P 到上覆水中，成为 P 释放源。P 通量率与 Fe/Al-P 之间存在显著的正相关关系，表明沉积物 P 的释放主要源自生物可利用磷组分。显然，湖泊沉积物中固有的磷将是对白洋淀水质和生态系统保护的主要威胁。
