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Specific absorption and backscattering coefficients of the main water constituents in Poyang Lake, China

机译：Po阳湖主要水成分的比吸收系数和后向散射系数

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摘要

Obtaining and analyzing the specific inherent optical properties (SIOPs) of water bodies is necessary for bio-optical model development and remote sensing-based water quality retrievals and, further, for related ecological studies of aquatic ecosystems. This study aimed to measure and analyze the specific absorption and backscattering coefficients of the main water constituents in Poyang Lake, China. The specific absorption and/or backscattering coefficients of the main water constituents at 85 sampling sites (47 in 2010 and 38 in 2011) were measured and analyzed as follows: (1) the concentrations of chlorophyll a (CCHL), suspended particulate matter (Cspm) (including suspended particulate inorganic matter (Csptm) and suspended particulate organic matter (CSPOm)), and the absorption coefficients of total particulate (ap), phyto-plankton (aph), and non-pigment particulate (ad) were measured in the laboratory; (2) the total backscattering coefficients at six wavelengths of 420, 442, 470, 510, 590, and 700 nm, including the contribution of pure water, were measured in the field with a HydroScat-6 backscattering sensor, and the backscattering coefficients without the contribution of pure water (bb) were then derived by subtracting the backscattering coefficients of pure water from the total backscattering coefficients; (3) the specific absorption coefficients of total particulate (ap*), phytoplankton (aph*), and non-pigment particulate (a*d) were calculated by dividing ap, aph, and ad by CSPM, Cchl, and CSpiM, respectively, while the specific backscattering coefficients of total suspended particulate matter (b*b) were calculated by dividing bb by Cspm; and (4) the aph*, a*d, a*p and b*b of the remaining samples (46 in 2010 and 36 in 2011) were visualized and analyzed, and their relations to Cchl, Cspim or Cspm were studied, respectively. The main results are summarized as follows: (1) the aph values at 440 nm were 0.0367-0.7203 m~2mg~-1 with a mean of 0.1623± 0.1426 m2mg-1 in 2010 and 0.0319-0.7735 m~2mg~-1 with a mean of 0.3145±0.1961 m-2mg~-1 in 2011; there existed significant, negative, and moderate correlations between aph* and CCHl at 400-700 nm in 2010 and 2011 (p<0.05); (2) The ad values at 440 nm were 0.0672-0.2043 m~2g~-1 with a mean of 0.1022± 0.0326 m~2~-1 in 2010 and 0.0559-0.1347 m~2g~-1 with a mean of 0.0953±0.0196 m~2g~-1 in 2011; there existed value (p<0.01), available P (p<0.01), cation exchange capacity (p<0.05), and organic carbon (p<0.05) variables. The DTPA-extractable Cd had significant correlation with OC (p<0.01), pH, and clay content (p<0.05). Therefore, consumption rate of the phosphate fertilizers and crop rotation are important,factors on solubility and hence spatial variability of Cd content in agricultural soils.
机译：获取和分析水体的特定固有光学特性（SIOP）对于生物光学模型开发和基于遥感的水质检索，以及对水生生态系统的相关生态研究都是必不可少的。本研究旨在测量和分析China阳湖主要水成分的比吸收系数和后向散射系数。对85个采样点（2010年为47个，2011年为38个）的主要水成分的比吸收系数和/或后向散射系数的测量和分析如下：（1）叶绿素a（CCHL），悬浮颗粒物（Cspm）的浓度）（包括悬浮颗粒无机物（Csptm）和悬浮颗粒有机物（CSPOm）），并在其中测量了总颗粒（ap），浮游植物（aph）和非色素颗粒（ad）的吸收系数。实验室; （2）使用HydroScat-6反向散射传感器在野外测量了420、442、470、510、590和700 nm六个波长在总波长下的总反向散射系数，包括纯水的贡献，然后，通过从总反向散射系数中减去纯水的反向散射系数，得出纯水的贡献（bb）。 （3）通过分别用ap，aph和ad除以CSPM，Cchl和CSpiM来计算总颗粒（ap *），浮游植物（aph *）和非色素颗粒（a * d）的比吸收系数，而总悬浮颗粒物的特定反向散射系数（b * b）是用bb除以Cspm得出的； （4）对其余样本（2010年为46个，2011年为36个）的aph *，a * d，a * p和b * b进行可视化和分析，并分别研究了它们与Cchl，Cspim或Cspm的关系。 。主要结果概括如下：（1）440 nm处的aph值在2010年为0.0367-0.7203 m〜2mg〜-1，平均值为0.1623±0.1426 m2mg-1，而在2011年为0.0319-0.7735 m〜2mg〜-1。 2011年平均0.3145±0.1961 m-2mg〜-1;在2010年和2011年，在400-700 nm处aph *和CCH1之间存在显着，负和中等相关性（p <0.05）; （2）440 nm处的ad值在2010年为0.0672-0.2043 m〜2g〜-1，平均值为0.1022±0.0326 m〜2〜-1，在2010年为0.0559-0.1347 m〜2g〜-1，平均值为0.0953± 2011年为0.0196 m〜2g〜-1;存在值（p <0.01），有效磷（p <0.01），阳离子交换容量（p <0.05）和有机碳（p <0.05）变量。 DTPA可萃取的Cd与OC（p <0.01），pH和黏土含量（p <0.05）显着相关。因此，磷肥的消耗量和农作物的轮换很重要，是影响土壤中Cd含量的溶解度和空间变异性的因素。

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  • 来源
    《Environmental Monitoring and Assessment》 |2013年第5期|4191-4206|共16页
  • 作者

    Guofeng Wu; Lijuan Cui; Hongtao Duan; Teng Fei; Yaolin Liu;

  • 作者单位

    School of Resource and Environmental Science & Key Laboratory of Geographic Information System of the Ministry of Education, Wuhan University,430079 Wuhan, China;

    Institute of Wetland Research,Chinese Academy of Forestry,100091 Beijing, China;

    State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,210008 Nanjing, China;

    School of Resource and Environmental Science & Key Laboratory of Geographic Information System of the Ministry of Education, Wuhan University,430079 Wuhan, China;

    School of Resource and Environmental Science & Key Laboratory of Geographic Information System of the Ministry of Education, Wuhan University,430079 Wuhan, China;

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

    soil contamination; spatial distribution; phosphate fertilizers; cadmium; wheat;

    机译：土壤污染;空间分布;磷肥;镉;小麦;

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