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首页> 外文期刊>Estuarine Coastal and Shelf Science >Highs and lows: The effect of differently sized freshwater inflows on estuarine carbon, nitrogen, phosphorus, bacteria and chlorophyll a dynamics
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Highs and lows: The effect of differently sized freshwater inflows on estuarine carbon, nitrogen, phosphorus, bacteria and chlorophyll a dynamics

机译：高潮和低潮：不同大小的淡水流入量对河口碳，氮，磷，细菌和叶绿素a动态的影响

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Freshwater inflows play a key role in the delivery of organic carbon to estuaries. However, our understanding of the dynamics between discharge and carbon globally is limited. In this study we performed a 30-month monitoring study on the Bega and Clyde River estuaries, Australia, to understand the influence that discharge had on carbon, nitrogen, phosphorus, bacteria and chlorophyll a dynamics. We hypothesised that 1) discharge would be the most important factor influencing carbon and nutrient concentrations, though during low flows chlorophyll a would also be positively related to carbon, 2) bacteria would be related to dissolved organic carbon (DOC), and chlorophyll a to temperature, nitrogen and phosphorus, and 3) that concentrations of carbon, nitrogen, phosphorus, bacterial biomass and chlorophyll a would be significantly different between large 'flood flows', smaller 'fresh flows' and base flow conditions. We found that discharge was always the most important factor influencing carbon and nutrient concentrations, and that primary production appeared to have little influence on the variation in DOC concentration even during base flow conditions. We suggest this relationship is likely due to highly episodic discharge that occurred during the study period. Bacteria were related to DOC in the lower estuary sites, but phosphorus in the upper estuary. We suggest this is likely due to the input of bioavailable carbon in the upper estuary leading bacteria to be P limited, which changes downstream to carbon limitation as DOC becomes more refractory. Chlorophyll a was positively related to temperature but not nutrients, which we suggest may be due to competition with bacteria for phosphorus in the upper estuary. Carbon, nitrogen and phosphorus concentrations were different under flood, fresh and base flow conditions, though these differences sometimes varied between estuary locations for different resources. Overall, the results demonstrate that discharge plays an important structuring role for carbon, nutrient and bacteria dynamics on the Bega and Clyde Rivers, and that the differences observed between flood and fresh inflows suggest that further study into the influence of differently sized inflow events is important. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.
机译：淡水的流入在向河口输送有机碳中起关键作用。但是，我们对全球排放与碳之间动态关系的理解是有限的。在这项研究中，我们对澳大利亚的Bega和Clyde河口进行了为期30个月的监测研究，以了解排放对碳，氮，磷，细菌和叶绿素a动态的影响。我们假设1）排放是影响碳和养分浓度的最重要因素，尽管在低流量期间叶绿素a也与碳成正相关，2）细菌与溶解有机碳（DOC）和叶绿素a有关。温度，氮和磷，以及3）碳，氮，磷，细菌生物量和叶绿素a的浓度在大的“洪水流量”，小的“新鲜流量”和基本流量条件之间会显着不同。我们发现排放一直是影响碳和养分浓度的最重要因素，即使在基本流量条件下，初级生产似乎对DOC浓度的变化影响很小。我们建议这种关系很可能是由于在研究期间发生的高度间歇性放电。细菌与河口下部的DOC有关，但磷与河口上部有关。我们认为这可能是由于上河口细菌中生物利用碳的输入受P限制，随着DOC变得更难处理，其向下游转变为碳限制。叶绿素a与温度呈正相关，但与养分呈正相关，我们认为这可能是由于与细菌争夺河口上部的磷。在洪水，新鲜和基流条件下，碳，氮和磷的浓度是不同的，尽管对于不同的资源，河口位置之间的这些差异有时也会有所不同。总体而言，结果表明，流量对Bega河和Clyde河的碳，养分和细菌动力学起重要的结构作用，而洪水和新鲜水流之间的差异表明，进一步研究不同大小的水流事件的影响非常重要。 。 Crown版权所有（C）2014，由Elsevier Ltd.发行。保留所有权利。

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