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首页> 外文期刊>Estuarine Coastal and Shelf Science >The impact of natural water column mixing on iodine and nutrient speciation in a eutrophic anchialine pond (Rogoznica Lake, Croatia)
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The impact of natural water column mixing on iodine and nutrient speciation in a eutrophic anchialine pond (Rogoznica Lake, Croatia)

机译：天然水柱混合对富营养的chi鱼塘（克罗地亚Rogoznica湖）中碘和养分形态的影响

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摘要

The effect of natural water column mixing on the inorganic iodine and nutrient speciation in an intensely eutrophicated anchialine pond has been studied in late seasons of 2003 and 2004. As a result of an extremely warm and very dry European summer of 2003 this system attained isohaline and isothermal conditions in late-summer. Vertical mixing between highly reducing deep water with that in the upper layers produced intermediate redox conditions and homogeneous nutrient distribution within the water column. Nitrogen speciation additionally suggests a pronounced activity of nitrifying bacteria and/or archaea arising from an influx of the ammonium nitrogen. Meanwhile, in 2004 the water column attained nearly isohaline conditions late in November. Partial mixing of the water column resulted in downward transport of dissolved oxygen and moderate upward fluxes of nutrients into the surface layers, whereby the flux of ammonium was sufficiently high to promote nitrification. A response of the inorganic iodine to mixing of the water column was in accord with those of major constituents and nutrients. The results demonstrate that, in spite of marked changes in speciation, total inorganic iodine remained preserved within the system over each survey. Oxic to hypoxic redox conditions formed immediately after the overturn in September 2003 favoured iodate reduction, while slow mixing in November 2004 promoted iodide oxidation. In this system dominated by the sedimentary influence a degree of oxygenation of deep water seems to control the inorganic iodine inventory for the pond.
机译：在2003年和2004年的后期，研究了自然水柱混合对高度富营养化的chi碱池塘中无机碘和养分形态的影响。由于2003年欧洲夏季非常炎热和非常干燥，该系统达到了等咸和夏末的等温条件。高度还原的深水与上层深水之间的垂直混合产生了中间的氧化还原条件，并且水柱内养分分布均匀。氮的形成还表明由于氨氮的流入而引起的硝化细菌和/或古细菌的显着活性。同时，在2004年11月下旬，水柱达到了近等盐条件。水柱的部分混合导致溶解氧的向下输送和适度的向上养分通入表层，因此铵通量足够高以促进硝化作用。无机碘对水柱混合的响应与主要成分和养分的响应一致。结果表明，尽管形态发生了显着变化，但在每次调查中，总无机碘仍保留在系统内。在2003年9月倾覆之后立即形成的氧化至低氧氧化还原条件有利于碘酸盐的还原，而2004年11月的缓慢混合促进了碘化物的氧化。在这个以沉积作用为主的系统中，深水的氧化程度似乎控制着池塘中无机碘的存量。

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