Nutrient transport through estuaries: The importance of the estuarine geography

Nutrient transport through estuaries: The importance of the estuarine geography
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通过河口的养分输送:河口地理的重要性

DOI:
10.1016/j.ecss.2014.03.014
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发表时间:
2014
期刊:
Estuarine, Coastal and Shelf Science
影响因子:
--
通讯作者:
Jickells T
Jickells T
中科院分区:
--
文献类型:
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作者:
Jickells T

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在这里,我们首先考虑通过河口,特别是河口的能力,修改通量的营养盐运输的性质。然后,我们特别关注的洗系统在英国作为一个特殊类型的“小河口”的例子,也考虑在马来西亚的一些热带河口系统。我们现在为洗涤系统提供营养预算,并在3000年前对这些预算进行估计。这些表明,目前该系统是一个小水槽河流硝酸盐(约30%的去除率),主要是由于反硝化和溶解无机磷(约24%)的掩埋。3000年前,在大规模人类干预开垦湿地用于农业之前,Wash系统要大得多,并且作为所有陆地氮的汇(尽管输入量要低得多)以及来自北海的硝酸盐的汇,主要通过有机氮埋藏。磷通量随时间的类似变化是明显的。我们认为,这一河口系统的功能的变化已被复制在许多其他河口系统。考虑到底栖生物的埋葬和反硝化作用的过程中的关键作用,我们继续建议,分类的河口面积和河流流量可能提供一个路线的河口养分截留效率的类型学。
We consider here first the nature of nutrient transport through estuaries and in particular the capacity of estuaries to modify that flux. We then focus particularly on the Wash system in the UK as an example of a particular type of “small estuary”, and also consider some tropical estuarine systems in Malaysia. We present nutrient budgets for the Wash system now and create estimates of these budgets 3000 years ago. These show that currently the system is a small sink for fluvial nitrate (∼30% removal) largely due to denitrification and dissolved inorganic phosphorus (∼24%) by burial. 3000 years ago, prior to large scale human intervention to reclaim wetlands for agriculture, the Wash system was much bigger and operated as a sink for all terrestrial nitrogen (albeit with much lower inputs) and also a sink for nitrate from the North Sea, predominantly via organic nitrogen burial. A similar change with time is evident in the phosphorus flux. We suggest that this change in function of this estuarine system has been replicated in many other estuarine systems. Given the key role of benthic processes of burial and denitrification we go on to suggest that the classification of estuaries in terms of area and river flow may offer a route to a typology of estuarine nutrient retention efficiency.
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