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Historical and seasonal dynamics of phosphorus mobility in Sancha Lake of Southwest China's Sichuan Province

机译:四川省西南三岔湖磷迁移的历史和季节动态

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摘要

Phosphorus (P) fractionations in the surface sediment of Sancha Lake in China's southwestern Sichuan Province were examined to assess the potential P release at the water-sediment interface and to understand its seasonal (2009-2010) and historical dynamics (1989-2010) in the surface water. Elevated P concentrations were detected in the sediment at main reservoir inflow, south canal of the Dujiangyan irrigation network, and intensive cage fish farming area, accounting for 32 and 40% of current total P discharges. The highest total P concentration (11,200 mu g P g(-1)) was observed in the upper sediment below intensive fish farming area with a specific enrichment of HCl-P (51% of total P) mainly from fish feeds and feces. These sediments had larger MgCl2-P pools with higher diffusive P fluxes (0.43-0.47 mg m(-2) d(-1)) from surface sediment than those from other areas (0.25-0.42 mg m(-2) d(-1)). The general small proportion of MgCl2-P (5.7-10%) and low diffusive P fluxes from surface sediment (<0.02% of sediment P storage (0-1 cm)) indicate low mobility and slow release of P from sediments. The sediment as an internal P source led to a 3-4-year lag for P concentration decrease in the surface water after restriction of anthropogenic P discharges since 2005. Thus, the peak P concentration in April and September could be explained as a combined effect of supplementing internal loading via reductive processes in sediments and seasonal water vertical circulation in the early spring and fall. Policy played a crucial role in reducing P inputs to the lake.
机译:研究了中国西南部四川省三岔湖表层沉积物中的磷(P)分级,以评估水-沉积物界面的潜在磷释放量,并了解其季节性(2009-2010年)和历史动态(1989-2010年)。地表水。在主要水库入水口,都江堰灌溉网南渠和网箱养鱼密集区的沉积物中检测到高浓度的磷,分别占当前磷排放总量的32%和40%。在集约化鱼类养殖区下方的上部沉积物中观察到最高的总磷浓度(11,200μg P g(-1)),主要从鱼饲料和粪便中富集了HCl-P(占总磷的51%)。这些沉积物具有较大的MgCl2-P储量,其表面沉积物的P扩散通量较高(0.43-0.47 mg m(-2)d(-1)),而其他区域的扩散P通量较高(0.25-0.42 mg m(-2)d(- 1))。 MgCl2-P的比例一般较小(5.7-10%),而来自表层沉积物的扩散性P通量较低(<0.02%的沉积物P储藏量(0-1厘米)),表明P的迁移率低且从沉积物中释放缓慢。自2005年以来,由于人为P排放的限制,沉积物作为内部P源导致了地表水中P浓度下降3-4年的滞后。因此,4月和9月的P峰值浓度可以解释为综合影响春季和秋季早期通过减少沉积物中的沉积物和季节性水垂直循环来补充内部负荷的方法。政策在减少向湖泊的磷投入方面发挥了关键作用。

著录项

  • 来源
    《Environmental Monitoring and Assessment》 |2017年第1期|16.1-16.14|共14页
  • 作者单位

    Chengdu Acad Environm Sci, Environm Protect Bldg,8 Fanglin Rd, Chengdu 610072, Sichuan, Peoples R China;

    Sichuan Univ, Coll Architecture & Environm, Dept Environm, 24,South Sect 1,First Ring Rd, Chengdu 610065, Sichuan, Peoples R China;

    China Geol Survey, Chengdu Ctr, 2,North Sect Three,First Ring Rd, Chengdu 610081, Sichuan, Peoples R China;

    Univ Basel, Dept Environm Geosci, CH-4056 Basel, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Reservoir; Sediment; Eutrophication; Environmental protection; Socio-economic development; Aquatic ecosystem;

    机译:水库;沉积物;富营养化;环境保护;社会经济发展;水生生态系统;
  • 入库时间 2022-08-17 13:25:45

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