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首页> 外文期刊>Marine ecology progress series >Deep primary production in coastal pelagic systems: importance for ecosystem functioning
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Deep primary production in coastal pelagic systems: importance for ecosystem functioning

机译：沿海中上层系统的深层初级生产：对生态系统功能的重要性

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Monitoring data (1999 to 2012) and data from a 2 wk field study at a seasonally stratified station in the Aarhus Bight near the Danish coast were used to demonstrate that the vertical distribution of photosynthesis influences both water column oxygen conditions and the fate of the organic material produced. The primary production (PP) occurring below the surface layer, i.e. in the pycnocline-bottom layer (PBL), is shown to contribute significantly to total PP. Oxygen concentrations in the PBL are shown to correlate significantly with the deep primary production (DPP) as well as with salinity, phosphate loading, wind and transparency in the surface layer. The phyto-plankton communities detected in the surface layer and PBL during the field study were very different. Large cells, especially Ceratium spp., dominated in the PBL, while small diatoms, mainly Proboscis alata, dominated in surface waters. On the basis of chlorophyll-normalised photo-synthetic parameters and variable fluorescence, it is shown that the 2 populations were physiologically distinct. The population in the PBL was photosynthetically active and adapted/ acclimated to lower light than the population in the surface layer. Sinking rates (based on sediment trap collections) of carbon and nitrogen were highest in the PBL. Lyngsgaard et al. (2014; Limnol Oceanogr 59:1679-1690) have demonstrated that the vertical distribution of PP in this region is influenced by anthropogenic nutrient loading. Thus, the present study indicates that eutrophication effects may include changes in the structure of planktonic food webs and element cycling in the water column, both brought about through an altered vertical distribution of PP.
机译：监测数据（1999年至2012年）和丹麦海岸附近奥胡斯湾季节性分层站点的2周实地研究数据证明，光合作用的垂直分布会影响水柱氧气状况和有机物的命运生产的材料。已显示在表层以下，即在比高辛碱层（PBL）中发生的初级产物（PP）对总PP有显着贡献。研究表明，PBL中的氧气浓度与深层初产（DPP）以及表层的盐度，磷酸盐含量，风和透明性显着相关。在实地研究中，在表层和PBL中检测到的浮游植物群落非常不同。在PBL中，大型细胞，尤其是角藜属（Ceratium spp。）占主导，而在地表水中，小型硅藻，主要是长鼻象藻（Proboscis alata）占主导。根据叶绿素归一化的光合参数和可变的荧光，表明这两个种群在生理上是不同的。 PBL中的种群具有光合作用，并且比表层的种群适应/适应的光照要低。在PBL中，碳和氮的下沉率（基于沉积物陷阱的收集）最高。 Lyngsgaard等。 （2014; Limnol Oceanogr 59：1679-1690）证明，该区域PP的垂直分布受人为营养物负荷的影响。因此，本研究表明富营养化作用可能包括浮游食物网的结构变化和水柱中元素的循环，这都是通过改变PP的垂直分布来实现的。

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