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首页> 外文期刊>Estuarine Coastal and Shelf Science >Organic matter in ria sediments: Relevance of terrestial sources and temporal variations in rates of accumulation
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Organic matter in ria sediments: Relevance of terrestial sources and temporal variations in rates of accumulation

机译：里亚沉积物中的有机物：陆地来源的相关性和积累速率的时间变化

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The Ria of Vigo, one of the classical rias of SW Europe, is an environment of high production of organic matter naturally induced by the Galician upwelling. The organic matter is partly supplied by small rivers but mainly by sewage plants along the ria shoreline; jointly they contribute 725 t y~(-1) of POC, of which 72% is of anthropogenic origin. The freshwater flux is equivalent to a supply of 5 g m~(-2) yr~(-1) of allochtonous POC to the ria floor. However the rate of accumulation of POC is dominated by the order of magnitude higher supply of autochthonous material from the net primary production. The present accumulation rate of organic matter (49-58 gpoc m~(-2) yr~(-1)) is lower than the average supply, estimated from the sedimentary record, to the ria since the middle of the nineteen Century (>60 gpoc m~(-2) yr~(-1)). This difference may be due to anthropogenic activity or changes in the upwelling pattern. The composition of the organic matter in the sediment reflects the relative importance of the various sources (terrestrial-marine). While terrestrial woody materials dominate the inner ria, phytoplankton remains dominate the remainder of the ria. Rock-Evaluation analysis indicates the inner ria is the site of deposition of gas-prone material and it is inferred that the outer ria of oil-prone organic matter. The controls on the accumulation of POC in the rias show many differences to those found in estuaries affected by anthropogenic activities e.g. agriculture and increasing human population.
机译：维戈河谷（Ria of Vigo）是欧洲西南部的经典河谷之一，是由加利西亚上升流自然诱发的有机物高产环境。有机物部分由小河提供，但主要由里亚河沿岸的污水处理厂提供。他们共同贡献了725 t y〜（-1）的POC，其中72％来自人为来源。淡水通量等效于向ria底部供应5 g m〜（-2）yr〜（-1）的异源POC。但是，POC的积累速率主要来自净初级生产的本地材料供应量高出数量级。自19世纪中叶以来，目前有机物的累积速率（49-58 gpoc m〜（-2）yr〜（-1））低于根据沉积记录估算的ria的平均供应量（> 60 gpoc m〜（-2）yr〜（-1））。这种差异可能是由于人为活动或上升流模式的变化。沉积物中有机物的组成反映了各种来源（陆地海洋）的相对重要性。虽然陆地木本材料占主导地位，但浮游植物仍占主导地位。岩石评估分析表明内部ria是易燃气体沉积的部位，并推断出石油容易产生的有机物的外部ria。 rias中POC积累的控制措施与受人为活动影响的河口发现的控制措施有很多差异。农业和人口增长。

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