Sources and distribution of organic carbon and nitrogen in the Tagliamento River, Italy
Sources and distribution of organic carbon and nitrogen in the Tagliamento River, Italy
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DOI：
10.1007/s00027-003-0683-4
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发表时间：
2004-03
期刊：
影响因子：
2.4
通讯作者：
E. Kaiser;D. Arscott;K. Tockner;B. Sulzberger
中科院分区：
文献类型：
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作者：
E. Kaiser;D. Arscott;K. Tockner;B. Sulzberger
利用元素碳（C）、氮（N）浓度、C：N比值和稳定碳、氮同位素组成（δ 13 C和δ 15 N），确定了河流固相萃取超滤溶解有机物（DOM）和悬浮细颗粒有机物（FPOM）的来源。DOM和FPOM以及潜在的源材料进行了季节性收集下游方向沿着最后一个大的半天然河流排水欧洲阿尔卑斯山，Tagliento河（意大利）。这些调查表明，FPOM和固相萃取和超滤DOM在这条河的主要来源是河流携带的细菌和微藻生物量和土壤来源的有机质的混合物。与DOM分离物相比，FPOM和散装DOM的低C：N比进一步表明FPOM具有高活性，并且其降解释放生物可利用的DOM化合物。下游的丰度和分布的有机C和N也比较无机营养盐的浓度和表明，FPOM矿化是一个主要途径，形成的无机营养盐在Tagenento表面沃茨。
Elemental carbon (C) and nitrogen (N) concentrations, C:N ratios, and stable C and N isotopic compositions (δ13C and δ15N) were used to determine the sources of riverine solid phase extracted and ultrafiltered dissolved organic matter (DOM) and suspended fine particulate organic matter (FPOM). DOM and FPOM as well as potential source materials were seasonally collected in downstream direction along the last large semi-natural river draining the European Alps, the Tagliamento River (Italy). These investigations suggest that the major sources of FPOM and solid phase extracted and ultrafiltered DOM in this river are a mixture of river-borne bacterial and microalgal biomass and soil-derived organic matter. Low C:N ratios of FPOM and bulk DOM, compared to DOM isolates, further indicate that FPOM is highly reactive and that its degradation releases bioavailable DOM compounds. Downstream abundance and distribution of organic C and N were also compared to inorganic nutrient concentrations and indicate that FPOM remineralization is a major pathway for the formation of inorganic nutrients in Tagliamento surface waters.