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首页> 外文OA文献 >Tidal exchanges of carbon, nitrogen and phosphorus between a Sarcocornia salt-marsh and the Kariega estuary, and the role of salt-marsh brachyura in this transfer
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Tidal exchanges of carbon, nitrogen and phosphorus between a Sarcocornia salt-marsh and the Kariega estuary, and the role of salt-marsh brachyura in this transfer

机译：sarcocornia盐沼与Kariega河口之间的碳，氮和磷的潮汐交换，以及盐沼沼泽在这种转移中的作用

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摘要

Tidal exchanges of organic carbon, nitrogen and phosphorus between a south temperate Sarcocornia marsh and its associated estuary are examined. Subterranean water flow was small, and the hydraulic exchange between the two systems largely surficial. The dominant tidal signal was semi-diurnal, and the extent of inundation of the marsh varied considerably as a consequence of interactions of semi-lunar tidal cycles with changes in daily mean sea level. Annual net fluxes of organic carbon were directed from the marsh to the estuary, but amounted to less than 2% of marsh aerial net primary productivity. This indicates the incompatibility of E.P. Odum's outwelling hypothesis to this marsh-estuarine system. The direction of net flux of organic carbon switched on a time-scale of days. These directions were largely correlated with mesoscale oceanic events, which materially altered the extent of marsh inundation, and which provided evidence of the mutual exclusivity of outwelling of DOC from the marsh and oceanic upwelling. Laboratory mesocosm experiments using intact marsh blocks of sediment from the marsh were conducted to identify the proximate processes and interactions at the marsh-water interface responsible for the variability of marsh-estuarine exchanges. Patterns of fluxes of organic carbon, total nitrogen and phosphorus were markedly different in the structurally contrasted tidal creek and Sarcocornia Zone regions of the marsh. Both regions exported these components, but the fluxes of organic carbon and total phosphorus were significantly larger from the tidal creek than from the Sarcocornia zone, and the opposite applied to nitrogen. The presence of brachyuran crabs . the most numerous macrofauna on the marsh enhanced the flux of carbon, nitrogen and phosphorus from the marsh biocoenosis, largely as a result of the effect of their bioturbation. Evidence is examined which suggests that differential mobilization of nutrients in the two zones by crabs is responsible for biogeochemical coupling of these two regions , which may account for the elevated productivity of salt- marsh systems
机译：考察了南部温带石炭纪沼泽及其相关河口之间的有机碳，氮和磷的潮汐交换。地下水流量很小，并且两个系统之间的水力交换在很大程度上是表面的。主导的潮汐信号为半日，由于半月潮周期与每日平均海平面变化的相互作用，沼泽的淹没程度差异很大。每年的有机碳净通量是从沼泽引导到河口的，但不到沼泽空中净初级生产力的2％。这表明E.P.奥杜姆对此沼泽-河口系统的普遍假设。有机碳净通量的方向在几天的时间尺度上转换。这些方向很大程度上与中尺度的海洋事件有关，后者从根本上改变了沼泽淹没的程度，并为DOC远离沼泽和海洋上升的相互排斥提供了证据。进行了实验室中观试验，使用了来自沼泽的完整的沼泽沉积物块来确定造成沼泽-河口交换变化的沼泽-水界面附近的过程和相互作用。在结构上形成对比的潮汐小溪和Sarcocornia区的有机碳，总氮和磷的通量模式显着不同。两个地区都出口了这些成分，但是潮汐小溪中有机碳和总磷的通量明显大于Sarcocornia地区，而氮则相反。短臂蟹的存在。沼泽上数量最多的大型动物增加了沼泽生物群落的碳，氮和磷的通量，这在很大程度上是由于其生物扰动的结果。检查的证据表明，蟹在这两个区域中营养的不同动员是这两个区域生物地球化学耦合的原因，这可能解释了盐沼系统生产力的提高

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    Taylor David Ian;

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  • 年度 1988
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  • 原文格式 PDF
  • 正文语种 English
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