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首页> 外文期刊>Ecological indicators >Effects of land use on the characteristics and composition of fluvial chromophoric dissolved organic matter (CDOM) in the Yiluo River watershed, China
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Effects of land use on the characteristics and composition of fluvial chromophoric dissolved organic matter (CDOM) in the Yiluo River watershed, China

机译：土地利用对中国伊罗河流域河流发烧溶解有机物（CDOM）的特征和组成的影响

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摘要

Chromophoric dissolved organic matter (CDOM) is a key indicator of water quality, biogeochemical state and nutrient content in freshwaters. Land use affects the concentration, quality, source, and age of CDOM in rivers. To investigate the characteristics and composition of fluvial CDOM and the effects of land use on carbon components, 37 sites were sampled during May 2017 in the Yiluo River watershed, China. In addition, water parameters, absorption and fluorescence spectral parameters of CDOM were measured in situ and in the lab. Some samples showed atypical CDOM absorption curves with an absorption shoulder at 390 nm. CDOM absorption at 440 nm [a(CDOM)(440)] was positively correlated with dissolved organic carbon (DOC) and fluorescence intensity (Fn). Fluorescence excitation-emission spectra indicated the presence of strong humic-like and tryptophan-like fluorophores revealing terrestrial, anthropogenic influence. Low recent autochthonous contribution index (BIX) and humification index (HIX) values indicated that autochthonous production was an important contributor to CDOM levels. Cropland-dominated subwatersheds (SWs) exhibited high a(CDOM)(440), Fn and DOC and forest-dominated SWs showed low CDOM concentration. At the riparian buffer scale, CDOM in the built-up-dominated areas showed the highest CDOM concentration. Moreover, built-up areas greatly influenced the concentrations of DOC and CDOM quantificationally at both the SW and riparian buffer scales; more than 64% of the overall variation in carbon components at the SW scale and 46% of DOC variation at the riparian buffer scale was explained by built-up areas. Overall, the results of our study showed that the properties of fluvial CDOM are dependent on the surrounding land use, further highlighting the importance of land use for CDOM photoreactivity in SWs and riparian buffer zones.
机译：发色团溶解有机物（CDOM）是水质，生物地造理状态和新鲜水域营养含量的关键指标。土地利用影响河流中CDOM的浓度，质量，来源和年龄。为探讨氟虫CDom的特点和组成以及土地利用对碳成分的影响，在2017年5月在中国伊罗河流域中取样了37个遗址。此外，CDOM的水参数，吸收和荧光光谱参数原位和实验室测量。一些样品显示出在390nm的吸收肩部的非典型CDom吸收曲线。在440nm [a（cdom）（440）处的Cdom吸收与溶解的有机碳（doc）和荧光强度（fn）正相关。荧光激发 - 发射光谱表明存在强大的腐殖液和色氨酸样荧光团，揭示陆地，人为影响。最近的最近的自动贡献指数（BIX）和湿度指数（HIX）值表明，自动加载的产量是CDOM水平的重要贡献者。农田占主导地形的副行病（SWS）展现出高A（CDOM）（440），FN和DOC和森林主导的SWS显示出低CDom浓度。在河岸缓冲量表中，内置主导地区的CDOM显示了最高的CDOM浓度。此外，建筑区域大大影响了SW和河岸缓冲尺度的DOC和CDOM的浓度;通过建筑区域解释了SW标准中碳成分的超过64％的碳成分和46％的DOC变异。总体而言，我们的研究结果表明，河流CDOM的性质取决于周围的土地利用，进一步突出了SWS和河流缓冲区中CDOM光致敏度的土地利用的重要性。

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  • 来源
    《Ecological indicators》 |2020年第7期|106332.1-106332.10|共10页
  • 作者

    Shao Tiantian; Wang Tao;

  • 作者单位

    Henan Univ Key Res Inst Yellow River Civilizat & Sustainable Kaifeng 475001 Peoples R China|Henan Univ Collaborat Innovat Ctr Yellow River Civilizat Kaifeng 475001 Peoples R China|Henan Univ Coll Environm & Planning Kaifeng 475001 Peoples R China;

    Henan Univ Key Res Inst Yellow River Civilizat & Sustainable Kaifeng 475001 Peoples R China|Henan Univ Collaborat Innovat Ctr Yellow River Civilizat Kaifeng 475001 Peoples R China|Henan Univ Coll Environm & Planning Kaifeng 475001 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    CDOM; EEMs; FRI; Land use; River;

    机译：CDD;EEMS;自由;土地使用;河流;

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