Spectral characteristics of dissolved organic matter in sediment pore water from Pearl River Estuary
Spectral characteristics of dissolved organic matter in sediment pore water from Pearl River Estuary
复制标题
珠江口沉积物孔隙水中溶解有机物的光谱特征
DOI：
10.1007/s11430-020-9671-9
复制
发表时间：
2020-10
期刊：
影响因子：
--
通讯作者：
Wang Peng
中科院分区：
文献类型：
--
作者：
Xu Yang;Li Penghui;Zhang Chuanlun;Wang Peng
河口生态系统作为海陆过渡带的重要组成部分，在海洋碳循环过程中发挥着重要作用。河口溶解性有机物（DOM）的来源、降解和保存一直是人们研究的热点。为了研究上述问题，本研究采用三维荧光光谱和紫外-可见吸收光谱技术，对珠江口3个沉积岩样（S1、S2和S3，盐度增加）孔隙水中DOM的空间分布和来源进行了研究。利用平行因子分析（PARAFAC）方法对三维荧光光谱数据进行分析，得到5个荧光组分：3个类腐殖酸组分（C1、C3和C4）和2个类蛋白质组分（C2和C5）。C2与沉积物中微生物脱氧核糖核酸（DNA）浓度呈显著正相关（R2 =0.69，P<0.01），表明类蛋白组分C2可能来源于原位微生物的催化作用。C5与DNA浓度的相关性较弱（R~2=0.40，P<0.05），推测是由于酚类化合物的掺入，其荧光峰与蛋白质样成分的荧光峰非常相似。类腐殖质荧光成分的来源极其复杂。S1站的含量相对较高（1.45-8.83 R.U.），这意味着陆地输入有很大的影响。3种类腐殖质组分在S2和S3的分布相似，荧光强度较低，说明这两个站位的DOM更可能受到藻类和微生物代谢的影响。腐殖化指数（HIX）和类蛋白质组分的荧光强度分别随深度增加和减少。类蛋白质组分的相对含量与光谱斜率比（SR）呈显著正相关，表明DOM由表层沉积物中的低分子量类蛋白质组分向次表层沉积物中的高分子量类腐殖酸组分过渡。本研究为了解河口沉积物中DOM的孔隙水尺寸/反应性（PWSR）模型及其生物化学过程提供了有价值的信息。
As key parts of land-sea transition zones, estuary ecosystems play a very important role in the ocean carbon cycle processes. The sources, degradation, and preservation of dissolved organic matter (DOM) in estuaries have long been the subject of intense study. To examine the aforementioned issues, this study examined three-dimensional fluorescence spectroscopy and ultraviolet-visible absorption spectroscopy to determine the spatial distribution and sources of DOM in the pore water of three sedimentary cores from the Pearl River Estuary (S1, S2 and S3, with increasing salinity). Using the parallel factor analysis (PARAFAC) method to analyze the three-dimensional fluorescence spectrum data, five fluorescent components were obtained- three humic-like components (C1, C3, and C4), and two protein-like components (C2 and C5). C2 exhibited a significant positive correlation with the sediment microbial deoxyribose nucleic acid (DNA) concentration (R~2=0.69, P<0.01), indicating that the protein-like component C2 might be derived from the catabolism of in situ microbes. C5 displayed a relatively weak correlation with DNA concentration (R~2=0.40, P<0.05), presumably due to the incorporation of phenolic compounds, which have a fluorescence peak very similar to that of protein-like components. The source of humic-like fluorescent components is extremely complex. The content at station S1 was relatively high (1.45-8.83 R.U.), which implies that terrestrial inputs had a significant influence. The three humic-like components showed similar distributions at S2 and S3, and the fluorescence intensity was rather low; this result indicates that the DOM at these two stations was more likely affected by the metabolism of algae and microorganisms. The humification index (HIX) and the fluorescence intensity of protein-like components increased and decreased, respectively, with depth. There was a significant positive correlation between the relative content of protein-like components and the spectral slope ratio (SR), which indicates that DOM transitioned from low-molecular-weight protein-like components in the surface sediment to high-molecular-weight humic-like components in the subsurface. This study provides valuable information for understanding the pore water size/reactivity (PWSR) model of DOM and its biochemical processes occurring in estuary sediments.
登录
查看更多内容
北海Helgoland Mud区域的表面和地下沉积物中的微生物群落和有机物组成。
影响因子：
5.2
作者：
Oni OE;Schmidt F;Miyatake T;Kasten S;Witt M;Hinrichs KU;Friedrich MW
通讯作者：
Friedrich MW
影响因子：
12.8
作者：
N. Maie;N. Scully;O. Pisani;R. Jaffé
通讯作者：
N. Maie;N. Scully;O. Pisani;R. Jaffé
影响因子：
8.8
作者：
Ying Wang;Di Zhang;Zhenyao Shen;J. Chen;C. Feng
通讯作者：
Ying Wang;Di Zhang;Zhenyao Shen;J. Chen;C. Feng
影响因子：
12.8
作者：
Chen, Meilian;Kim, Sung-Han;Hur, Jin
通讯作者：
Hur, Jin
影响因子：
12.8
作者：
Liyang Yang;J. Choi;J. Hur
通讯作者：
Liyang Yang;J. Choi;J. Hur