Phosphorus balance in a tropical shallow urban pond in Southeast Brazil: implications for eutrophication management
Phosphorus balance in a tropical shallow urban pond in Southeast Brazil: implications for eutrophication management
复制标题
巴西东南部热带浅水城市池塘的磷平衡：对富营养化管理的影响
作者：
Marcela Miranda;M. Marinho;N. Noyma;V. Huszar;Frank van Oosterhout;M. Lürling;J. Ometto;F. Pacheco
摘要详细的物质平衡评估营养物质的输入和输出是确定最有前途的战略，以减轻富营养化及其不良影响的基础。然而，这种分析是罕见的巴西城市池塘水质损害仍然是一个重大问题。我们进行了质量平衡，以确定主要的磷（P）源在一个过富营养化的热带浅水城市池塘。我们使用PCLake模型来估计减少浮游植物生物量所需的P负荷。在模型中，水柱被认为是主要单元。磷平衡计算从外部输入，内部输入从床沉积物的水柱，并从水柱通过地表水流出和床沉积物在一个完整的水文年的输出。进入池塘水的总P输入（外部和内部）为35.3 mg m−2 d−1，输出为35.2 mg m−2 d−1。 磷平衡显示，贡献的水柱从外部和内部来源分别为82.5%和17.5%。鸟类是磷输入的主要贡献者（76.0%）。从水体中流失的最高的P是沉积物（97.6%）。离开水体进入沉积物的磷大部分滞留在沉积物中，部分通过内负荷返回水体。减少该池塘富营养化的措施应侧重于综合管理，通过管理鸟类和避免沉积物中的P释放来减少外部和内部P源，并减少水在池塘中的停留时间。
ABSTRACT A detailed mass balance that evaluates nutrient inputs and outputs is fundamental to determining the most promising strategies to mitigate eutrophication and its undesirable effects. However, such analyses are rare in Brazilian urban ponds where water quality impairment remains a significant issue. We performed a mass balance to identify the main phosphorus (P) sources in a hypereutrophic tropical shallow urban pond. We used the PCLake model to estimate the P loading required to reduce phytoplankton biomass. The water column was considered the primary unit in the model. The P balance was calculated from external inputs, internal inputs from bed sediment to the water column, and outputs from the water column through surface water outflow and to the bed sediments over a full hydrological year. The total P input into the pond water (external and internal) was 35.3 mg m−2 d−1 and the output was 35.2 mg m−2 d−1. The P balance revealed that contributions to the water column from external and internal sources were 82.5% and 17.5%, respectively. Birds were the main contributor to P input (76.0%). The highest P loss from the water column was to the sediment (97.6%). Most of the P leaving the water column to the sediment was retained in the sediment, and part was returned to the water column through internal loading. Measures to reduce eutrophication in this pond should focus on integrated management to decrease both the external and internal P sources by managing birds and avoiding P release from sediment, and to decrease water residence time in the pond.
影响因子：
8.2
作者：
Wurtsbaugh, Wayne A.;Paerl, Hans W.;Dodds, Walter K.
通讯作者：
Dodds, Walter K.