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| Content Provider | Springer Nature Link |
|---|---|
| Author | Li, Yanping Wang, Shengrui Zhang, Li Zhao, Haichao Jiao, Lixin Zhao, Yali He, Xiaosong |
| Copyright Year | 2014 |
| Abstract | The content and composition of dissolved organic matter (DOM) in sediment directly affect nutrient cycling and material exchange in lake ecosystems. This study investigated the content and composition of DOM and its fractions in sediments, as well as the relationship between the different parameters and nitrogen (N) forms in DOM. The main aim of this study was to evaluate the compositional characteristics of DOM, hydrophobic bases (HOB), hydrophobic acids (HOA), hydrophobic neutral fractions (HON), and hydrophilic matter (HIM) in sediments from Erhai Lake, China.Seven surface sediment samples with different environmental characteristics were collected. The DOM in the sediment was fractionated into HOB, HOA, HON, and HIM using XAD-8 resin based on compound hydrophobicity. The contents of DOM and its fractions were measured using a TOC analyzer. The structural characteristics of DOM and its fractions were investigated using fluorescence spectroscopy and UV–Vis absorbance. Correlation analyses were carried out to better understand the relationships between the parameters of the spectral characteristics and the contents of the different N forms in DOM and its fractions.The content, spatial distribution and structure of DOM and its fractions in Erhai Lake sediment were affected by water depth and aquatic plants. The DOM content in sediment ranged from 0.2 to 0.5 g kg$^{−1}$. HON accounted for 41.3 to 85.7 % of DOM, whereas HIM constituted 15.0 to 58.7 % and was significantly negatively correlated with HON (R $^{ 2 }$ = 0.856, P < 0.01). HIM was more dominant than the hydrophobic matter in the southern site, but was less abundant in the north and central sites. Sediment DOM and its fractions comprised protein- and humic-like substances. The HOA and HIM comprised humic-like substances, which were the most abundant in the southern site.(1) Hydrophobic fractions are the major components of DOM in the sediments from the seven sites in Erhai Lake. (2) DOM and its fractions mainly originated from microbial sources. (3) The A $_{253}$/A $_{203}$ ratio is useful for evaluating the contents of N forms. The structure of DOM and its fractions are important in affecting the contents of DON. Nitrate (NO$_{3}$-N) contributes to eutrophication, and thus cannot be ignored from studies of Erhai Lake sediment. |
| Starting Page | 1599 |
| Ending Page | 1611 |
| Page Count | 13 |
| File Format | |
| ISSN | 14390108 |
| Journal | Journal of Soils and Sediments |
| Volume Number | 14 |
| Issue Number | 9 |
| e-ISSN | 16147480 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2014-05-29 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Dissolved organic matter (DOM) Erhai Lake Excitation–emission matrix (EEM) Fractionate Sediment Soil Science & Conservation Environment Environmental Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Stratigraphy Earth-Surface Processes |
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