文章摘要
温度对浒苔降解过程中溶解有机物释放及其组成的影响
Release Dynamics and Composition of Dissolved Organic Matter from the Macroalgae Ulva prolifera under Different Temperature Regimes
投稿时间:2019-02-21  修订日期:2019-06-04
DOI:
中文关键词: 浒苔  降解  溶解有机物  温度  平行因子分析
英文关键词: Ulva prolifera  decomposition  dissolved organic matter  temperature  parallel factor analysis
基金项目:国家重点研发计划"浒苔绿潮形成机理与综合防控技术研究及应用" (2016YFC1402101-03),国家自然科学基金青年基金(41606092)和国家海洋局海洋生态环境科学与工程重点实验室2016年度开放基金(MESE-2016-02)
作者单位E-mail
耿倩倩 中国海洋大学 17806234510@163.com 
陈 晶 中国科学院青岛生物能源与过程研究所  
李鸿妹 中国科学院青岛生物能源与过程研究所  
杨茹君 中国海洋大学  
张永雨 中国科学院青岛生物能源与过程研究所  
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中文摘要:
      2007-2018年浒苔绿潮在我国南黄海连续12年大规模爆发,每年上百万吨浒苔来不及打捞而沉降至海底。在浒苔绿潮消亡期,大量来不及打捞的浒苔藻体在微生物降解作用下释放丰富的碳、氮等生源要素。本研究探讨了温度对浒苔降解向水体释放溶解有机物(主要包括溶解有机碳和溶解有机氮)及其组成的影响。结果表明,不同温度(15℃、20℃和25℃)对0-7天浒苔降解过程中溶解有机碳(DOC)的释放有显著影响(P<0.05):20℃条件下DOC浓度显著高于15℃和25℃,而7-30天不同温度下水体的DOC浓度没有显著性差异(P>0.05)。对于溶解有机氮(DON)而言,温度对0-7天浒苔释放DON的影响不显著(P>0.05),而7-30天不同温度下DON浓度呈现显著性差异。其中,25℃条件下DON浓度显著低于15℃和20℃(P<0.05),这主要是由于在实验中后期,微生物将浒苔释放的DON部分转化为无机氮形式,而25℃条件下微生物丰度较高,进而导致较多的DON发生转化。另外,利用三维荧光光谱—平行因子分析技术(EEMs-PARAFAC)对浒苔降解过程中有色溶解有机物(CDOM)的组成和荧光特性进行探究,共鉴别出3个荧光组分:类色氨酸组分(C1、C2)和类腐殖质组分(C3)。不同温度下三组分的相对含量表明温度对CDOM的组成并没有显著影响(P>0.05),而对C2、C3组分的荧光强度具有显著性影响(P<0.05),这可能是不同温度下微生物的分解速率不同所导致。
英文摘要:
      Large green tides of Ulva prolifera have become an annual event during 2007-2018 in the southern Yellow Sea and millions of tons of U. prolifera which were not salvaged settle to the bottom every year. And the U. prolifera not be salvaged released a large amount of biogenic elements such as C、N through the degradation of microorganisms during the decline. This study discussed the effect of different temperature regimes on the release and the composition of dissolved organic matter (DOM) during the decomposition of U. prolifera. The results indicated that temperature significantly influenced the release of dissolved organic carbon (DOC) during 0-7 days (P<0.05): the DOC concentration of 20℃ was significantly higher than this of 15℃ and 25℃. There was no significant difference of DOC concentration at different temperatures during 7-30 days (P>0.05). For dissolved organic nitrogen (DON), temperature did not significantly affect the release of DON during the first seven days (P>0.05). There were significant differences in DON concentration at different temperatures after seven days (P<0.05): the concentration of DON was significantly lower at higher temperature (i.e. 25℃). The reason was that some organic nitrogen was converted to inorganic forms of nitrogen by microorganism during 7-30 days and the higher microorganism abundance at 25℃ led to the transformation of more DON. The composition and fluorescence characteristics of chromophoric dissolved organic matter (CDOM) were evaluated by excitation-emission matrix combined with parallel factor analysis (EEMs-PARAFAC). Three distinct dissolved organic matter fluorescent components (i.e. C1, C2 and C3) were identified using parallel factor analysis. C1, C2 and C3 were considered as tryptophan-like substances (also called protein-like substances), tryptophan-like substances and humic-like substances, respectively. The results showed that temperature had no significant impact on the composition of CDOM through comparing the relative contents of three fluorescent components at different temperatures (P>0.05). While the fluorescence intensities of Component 2 (C2) and Component 3 (C3) were larger with the higher temperature (i.e. 25℃). Temperature affecting the fluorescence intensity markedly (P<0.05) may be caused by the quicker microorganism decomposition rate under the higher temperature.
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