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首页> 外文期刊>Estuarine Coastal and Shelf Science >Lignin phenols used to infer organic matter sources to Sepetiba Bay - RJ, Brasil
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Lignin phenols used to infer organic matter sources to Sepetiba Bay - RJ, Brasil

机译：木质素酚类物质可用于推断Sepetiba湾的有机物来源-RJ，巴西

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摘要

Lignin phenols were measured in the sediments of Sepitiba Bay, Rio de Janeiro, Brazil and in bedload sediments and suspended sediments of the four major fluvial inputs to the bay; Sao Francisco and Guandu Channels and the Guarda and Cacao Rivers. Fluvial suspended lignin yields (28 3.5-14.6 mgC 10 g dw~(-1)) vary little between the wet and dry seasons and are poorly correlated with fluvial chlorophyll concentrations (0.8-50.2 μgCL~(-1)). Despite current land use practices that favor grassland agriculture or industrial uses, fluvial lignin compositions are dominated by a degraded leaf-sourced material. The exception is the Guarda River, which has a slight influence from grasses. The Lignin Phenol Vegetation Index, coupled with acid/aldehyde and 3.5 Db/V ratios, indicate that degraded leaf-derived phenols are also the primary preserved lignin component in the bay. The presence of fringe Typha sp. and Spartina sp. grass beds surrounding portions of the Bay are not reflected in the lignin signature. Instead, lignin entering the bay appears to reflect the erosion of soils containing a degraded signature from the former Atlantic rain forest that once dominated the watershed, instead of containing a significant signature derived from current agricultural uses. A three-component mixing model using the LPV1, atomic N:C ratios, and stable carbon isotopes (which range between -26.8 and -21.8‰) supports the hypothesis that fluvial inputs to the bay are dominated by planktonic matter (78% of the input), with lignin dominated by leaf (14% of the input) over grass (6%). Sediments are composed of a roughly 50-50 mixture of autochthonous material and terrigenous material, with lignin being primarily sourced from leaf.
机译：在巴西里约热内卢塞皮蒂巴湾的沉积物中以及该海湾的四个主要河流输入的床荷沉积物和悬浮沉积物中测量了木质素酚。圣弗朗西斯科和关渡海峡以及瓜达河和可可河。河流的悬浮木质素产量（28 3.5-14.6 mgC 10 g dw〜（-1））在干燥和潮湿的季节之间变化不大，并且与河流叶绿素浓度的相关性很弱（0.8-50.2μgCL〜（-1））。尽管目前的土地使用习惯有利于草原农业或工业用途，但河流木质素成分仍以降解的叶源物质为主。瓜达河是个例外，它受草的影响很小。木质素苯酚植被指数，再加上酸/醛和3.5 Db / V的比率，表明降解的叶派生酚也是海湾中木质素的主要保存成分。条纹Typha sp。的存在。和Spartina sp。木质部分没有反映海湾周围部分的草床。取而代之的是，进入海湾的木质素似乎反映了土壤的侵蚀，土壤中含有以前曾经统治过分水岭的前大西洋雨林的退化特征，而不是包含来自当前农业用途的重要特征。使用LPV1，原子N：C比和稳定碳同位素（范围在-26.8和-21.8‰之间）的三组分混合模型支持以下假设：到海湾的河流输入主要是浮游物质（占浮游物质的78％）。输入量），其中木质素占叶（输入量的14％）高于草（6％）。沉积物由大约50至50的土生土和土生土的混合物组成，木质素主要来自叶片。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2010年第3期|p.479-486|共8页
  • 作者

    C.E. Rezende; W.C. Pfeiffer; L.A. Martinelli; E. Tsamakis; J.I. Hedges; R.G. Keil;

  • 作者单位

    Universidade Estadual do Norte Fluminense, Centra de Biociencias e Biotecnologia, Laboratorio de Ciencias Ambientais, Av. Alberto Lamego, 2000, Campos dos Goytacazes,Rio de Janeiro, 28.015-620, Brazil Universidade Federal do Rio de Janeiro, Laboratorio de Radioisotopos, Instituto de Biofisica Carlos Chagas Filho, Cidade Universitaria, Rio de Janeiro, 21.949-900, Brazil;

    Universidade Federal do Rio de Janeiro, Laboratorio de Radioisotopos, Instituto de Biofisica Carlos Chagas Filho, Cidade Universitaria, Rio de Janeiro, 21.949-900, Brazil;

    Universidade de Sao Paulo, Centro de Energia Nuclear na Agricultura, Laboratorio de Ecologia Isotopica, Av. Centenario 303, Piradcaba, Sao Paulo, 13.400-961, Brazil;

    University of Washington, School of Oceanography, Box 357940, Seattle, WA 98195 7940, USA;

    University of Washington, School of Oceanography, Box 357940, Seattle, WA 98195 7940, USA;

    University of Washington, School of Oceanography, Box 357940, Seattle, WA 98195 7940, USA;

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  • 正文语种 eng
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  • 关键词

    δ~(13)C; lignin; sediment; suspended paniculate matter; fluvial; land use; marine;

    机译：δ〜（13）C;木质素沉淀;悬浮颗粒物;河流土地利用;海洋的;

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