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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Ammonification and denitrification rates in coastal Louisiana bayou sediment and marsh soil: Implications for Mississippi river diversion management
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Ammonification and denitrification rates in coastal Louisiana bayou sediment and marsh soil: Implications for Mississippi river diversion management

机译：路易斯安那州沿海you尤沉积物和沼泽土壤的氨化反硝化率：对密西西比河调水管理的意义

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摘要

The Caernarvon Diversion directs Mississippi River water into coastal marshes in the Breton Sound Estuary. Elevated nitrogen levels in the Mississippi River water result in nutrient loading to these coastal marsh systems and consequently to the coastal ocean. The goal of this study is to determine the potential nitrate removal rates for two different substrates. Bayou sediments represent the low flow conditions, when the water is constrained within the canals with high potential for transport to the coastal ocean. The marsh soil represents the high flow diversion events when flood water inundates up into the marshes. We sought to remove the plant effect by using cores containing bayou sediment and marsh soil, removing all roots and flooding with a water column containing 2 mg NO3-N L~(-1). Water column nitrate and ammonium concentration were monitored over 9 d. Net nitrate loss in bayou sediments was 9.5 ± 1.5 mg N m~(-2) d~(-1) while the nitrate loss was significantly less at 7.2 ±0.9 mg Nm~(-2) d~(-1) in the marsh soil. A comparison of nitrate reduction rates in vegetated and non-vegetated marsh soils indicated that the rate of denitrification increased tenfold in vegetated soils. This increase could be attributed to the "plant effect". Our results suggest that operating diversions on the high flow end of the spectrum would promote nitrate delivery over the vegetated marsh rather than flowing only through canals. Flooding of the vegetated marsh maximizes the potential for removal of riverine nitrate and limits delivery of nitrate to the coastal ocean, thereby mitigating expressions of eutrophication including algal blooms and hypoxia.
机译：卡那封河改道将密西西比河的水引到布列塔尼海湾的沿海沼泽。密西西比河水中的氮含量升高，导致这些沿海沼泽系统以及沿海海洋的养分负荷增加。这项研究的目的是确定两种不同底物的潜在硝酸盐去除率。当水被限制在运河中时，河道沉积物代表着低流量条件，并有很大的潜力输送到沿海海洋。当洪水淹没到沼泽中时，沼泽土壤代表着高流量分流事件。我们试图通过使用包含巴尤沉积物和沼泽土壤的岩心，去除所有根并用含有2 mg NO3-N L〜（-1）的水柱淹没来消除植物效应。监测水柱中硝酸盐和铵的浓度超过9天。巴游沉积物中的硝酸盐净损失为9.5±1.5 mg Nm〜（-2）d〜（-1），而硝酸盐损失在7.2±0.9 mg Nm〜（-2）d〜（-1）时明显减少。沼泽土壤。植被和非植被沼泽土壤中硝酸盐还原速率的比较表明，植被土壤中的反硝化速率增加了十倍。这种增加可以归因于“植物效应”。我们的结果表明，在频谱高流量端进行操作转移将促进硝酸盐在植物沼泽上的输送，而不是仅流过运河。植被沼泽的泛滥使去除河水硝酸盐的潜力最大化，并限制了硝酸盐向沿海海洋的输送，从而减轻了富营养化的表达，包括藻华和缺氧。

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