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首页> 外文期刊>Aquatic Sciences >Fingerprints of upstream catchment land use in suspended particulate organic matter (SPOM) at the river discharge sites in Lake Victoria (Kenya): insights from element, stable isotope and lipid biomarker analysis
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Fingerprints of upstream catchment land use in suspended particulate organic matter (SPOM) at the river discharge sites in Lake Victoria (Kenya): insights from element, stable isotope and lipid biomarker analysis

机译：维多利亚湖（肯尼亚）河流排放点上游悬浮颗粒有机物（SPOM）中上游流域土地利用的指纹：元素，稳定同位素和脂质生物标志物分析的见解

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摘要

Riverine transport and discharge are the primary pathways for terrigenous organic matter (OM) input to lacustrine environment. Understanding the influence of catchment land use on the source, composition and fate of terrigenous particulate OM in a lake is therefore vital. We used C/N, delta C-13, delta N-15 and lipid biomarkers in the suspended particulate OM (SPOM) at the seven river discharge sites in Lake Victoria, in an effort to evaluate the potential of upstream catchment land use on the biogeochemistry of SPOM. The total fatty acids (FAs), alcohols and sterols in SPOM ranged from 4.61 to 7.42 mu g/g, 1.52 to 3.32 mu g/g and 3.01 to 5.81 mu g/g respectively. At sites receiving discharge from industrial effluent the FAs were dominated by short chain FAs (SCFAs), polyunsaturated FAs (PUFAs), monounsaturated FA (MUFAs) and branched FAs (brFAs); the alcohols were dominated by short chain alcohols (SCOHs) and phytol; sterols were dominated by 27 Delta(5), 27 Delta(0), 28 Delta(5,22), 28 Delta(5), which are associated either with phytoplankton or zooplankton. Sites receiving discharge from substantial agricultural activity in the catchment were dominated by long chain FAs (LCFAs), long chain alcohols (LCOHs) and 29 Delta(5,22) and 29 Delta(5) sterols, reflecting vascular plant terrigenous input. There was also evidence of OM from mixed autochthonous and allochthonous sources at the sites regardless of the upstream catchment land use activities. The findings suggest that human land use in upstream watersheds affect the source, composition and distribution of SPOM discharged by rivers, which may not only impact nutrient cycling in the lacustrine environment, but may also change the quality of SPOM.
机译：河流的运输和排放是陆生有机质（OM）输入湖泊环境的主要途径。因此，了解流域土地利用对湖泊中陆源性颗粒物OM的来源，组成和结局的影响至关重要。我们在维多利亚湖七个河流排放点的悬浮颗粒物OM（SPOM）中使用了C / N，δC-13，δN-15和脂质生物标记，以评估上游集水区土地利用的潜力。 SPOM的生物地球化学。 SPOM中的总脂肪酸（FAs），醇和甾醇的范围分别为4.61至7.42微克/克，1.52至3.32微克/克和3.01至5.81微克/克。在接受工业废水排放的场所，FA占主导地位的是短链FA（SCFA），多不饱和FA（PUFA），单不饱和FA（MUFA）和支链FA（brFA）。这些醇主要是短链醇和植物醇。固醇主要由与浮游植物或浮游动物相关的27 Delta（5），27 Delta（0），28 Delta（5,22），28 Delta（5）主导。流域中大量农业活动所排放的地点主要是长链脂肪酸（LCFA），长链醇（LCOH）和29 Delta（5,22）和29 Delta（5）固醇，反映了维管植物的陆源性投入。无论上游上游集水区的土地利用活动如何，也有证据表明该地点来自混合的本地和外来来源。研究结果表明，上游流域的人类土地利用会影响河流排放的SPOM的来源，组成和分布，这不仅会影响湖泊环境中的养分循环，而且还会改变SPOM的质量。

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  • 来源
    《Aquatic Sciences》 |2017年第1期|73-87|共15页
  • 作者

    Ngugi Charles C.; Oyoo-Okoth Elijah; Gichuki John; Gatune Charles; Mwangi-Kinyanjui James;

  • 作者单位

    Kenyatta Univ, Sch Agr & Enterprise Dev, Dept Agr Resource Management, POB 43844-00100, Nairobi, Kenya;

    Karatina Univ, Sch Nat Resources & Environm Studies, Dept Nat Resource, POB 1957-10101, Karatina, Kenya;

    Environm Protect Dept, Big Valley Rancheria Band Pomo Indians, 2726 Mission Rancheria Rd, Lakeport, CA 95453 USA;

    Karatina Univ, Sch Nat Resources & Environm Studies, Dept Nat Resource, POB 1957-10101, Karatina, Kenya;

    Karatina Univ, Sch Nat Resources & Environm Studies, Dept Nat Resource, POB 1957-10101, Karatina, Kenya;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Freshwater lake; Lipid biomarkers; Suspended organic matter; Riverine discharge; Watershed land use;

    机译：淡水湖;脂质生物标志物;悬浮有机物;河水排放;流域土地利用;

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