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夏季闽江CDOM的空间分布与降解特征
摘要点击 298  全文点击 134  投稿时间:2018-06-02  修订日期:2018-07-03
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中文关键词  闽江  有色溶解有机质(CDOM)  三维荧光光谱-平行因子分析  微生物降解  光降解
英文关键词  Minjang River  chromophoric dissolved organic matter (CDOM)  EEMs-PARAFAC  microbial degradation  photodegradation
作者单位E-mail
程琼 福州大学环境与资源学院, 福州 350116 1767456288@qq.com 
庄婉娥 福建农林大学生命科学学院, 福州 350002  
王辉 福州大学环境与资源学院, 福州 350116  
陈苇 福州大学环境与资源学院, 福州 350116  
杨丽阳 福州大学环境与资源学院, 福州 350116 yangly@fzu.edu.cn 
中文摘要
      利用三维荧光光谱-平行因子分析技术(EEMs-PARAFAC)以及微生物和光降解实验等方法,分析夏季闽江下游-河口区有色溶解有机质(CDOM)的组成、分布及其降解特征.结果表明,闽江下游-河口区CDOM存在三类荧光组分:类腐殖质、类酪氨酸和类色氨酸;类腐殖质是河段CDOM的主要荧光组分,在河口区随着盐度增加主要的荧光组分逐渐变为类蛋白质.CDOM的丰度变化呈现出明显的空间分布格局:河段CDOM的吸收系数a(280)较低,进入市区后有所增加,到了郊区呈现下降的趋势,而在河口区迅速下降;保守估计福州市区对闽江CDOM的贡献为8%.河段a(280)易被微生物降解和光降解,降解率分别为(28±8)%和(44±7)%,其生物可利用性和光化学活性远高于受海源CDOM影响的河口区;类腐殖质、类酪氨酸和类色氨酸荧光组分在河段具有较高的光化学活性,降解率分别为(75±0.5)%、(58±21)%和(73±3)%,但不易被微生物降解,而且在28 d微生物培养后出现类腐殖质的累积.
英文摘要
      The composition, distribution, and degradation of chromophoric dissolved organic matter (CDOM) in the lower reach and estuary of the Minjiang River were analyzed using fluorescence excitation-emission matrices-parallel factor analysis (EEMs-PARAFAC) and microbial and photochemical degradation experiments. The results show that there are three types of fluorescence components in the study area:humic-like, tyrosine-like, and tryptophan-like. The humic-like components are the main components in the river zone, while the protein-like components become dominant with increasing salinity in the estuary. The change of the CDOM abundance shows a notable spatial distribution pattern. The absorption coefficient a(280) of CDOM is lower in the river, increases after entering the urban area, shows a decreasing trend in the suburbs, and rapidly declines in the estuary. A conservative estimate of the contribution of the Fuzhou urban area to the CDOM of the Minjiang River is 8%. The a(280) in the river is susceptible to microbial and photochemical degradation and the degradation percentages are (28±8)% and (44±7)%, respectively. The bioavailability and photochemical reactivity of a(280) are much higher in the river than in the estuary. The humic-like, tyrosine-like, and tryptophan-like components show a higher photochemical reactivity in the river, with degradation percentages of (75±0.5)%, (58±21)%, and (73±3)%, respectively. The fluorescent components are not labile with respect to microbial degradation and humic-like components are accumulated after 28 days of microbial culture.

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