Towards understanding organic matter fluxes and reactivity in surface waters: Filtering impact on DOC and POC degradation
Towards understanding organic matter fluxes and reactivity in surface waters: Filtering impact on DOC and POC degradation
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了解地表水中的有机物通量和反应性：过滤对 DOC 和 POC 降解的影响
DOI：
10.1002/hyp.14067
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发表时间：
2021
影响因子：
3.2
通讯作者：
Moody C
中科院分区：
文献类型：
--
作者：
Moody C
泥炭地只占地球很小的面积，但在全球范围内储存了大量的碳，并出口了不成比例的河流有机碳，特别是当泥炭地退化或受到干扰时。具有高浓度溶解有机碳和颗粒有机碳（DOC和POC）的泥炭地源头集水区提供了一个机会，可以研究在POC存在的情况下可能导致DOC增加或减少周转的竞争效应的可能性。POC和DOC都可以被光和微生物降解，产生更小的分子并释放co2和ch4到大气中，POC可以通过提供吸附位点和提供微生物与DOC相互作用的表面来抑制光的穿透，稳定DOC。然而，大多数泥炭地河流碳研究都是使用过滤水样进行的，并且只测量DOC浓度，因此颗粒有机物（POM）对流中有机碳处理的影响相对未知。因此，研究可能低估了河流中的碳转化，因为它们没有考虑颗粒物质对溶解浓度的相互作用；损失可能比先前估计的要高，从而增加泥炭地源头对温室气体排放的贡献。在本研究中，我们通过量化POM在控制POM浓度的水中随时间产生的DOC和POC，评估了当前的DOC降解研究方法是否准确地代表了POM对DOC降解的影响。经过过滤和未过滤的水在70小时内都减少了60%的DOC，而添加POM的水只减少了35%。结果表明：过滤对DOC降解率影响不显著；然而，当POC浓度增加一倍时，DOC的降解显著减少，这表明在高POC浓度的水中，仍然需要过滤以获得准确的DOC转化速率。
Peatlands cover a very small area of the Earth, but store globally significant quantities of carbon and export disproportionate quantities of fluvial organic carbon, especially when the peatlands are degraded or disturbed. Peatland headwater catchments with high concentrations of dissolved and particulate organic carbon (DOC and POC) provide an opportunity to investigate the possibility of competing effects that could lead to enhanced or diminished turnover of DOC in the presence of POC. Both POC and DOC can be degraded by light and microbes, producing smaller molecules and releasing CO2and CH4to the atmosphere, and POC can inhibit light penetration, stabilize DOC by providing adsorption sites and providing surfaces for microbes to interact with DOC. However, the majority of peatland fluvial carbon studies are conducted using filtered water samples, and measure only the DOC concentration, so the impact of the particulate organic matter (POM) on in‐stream processing of organic carbon is relatively unknown. It is therefore possible that studies have underestimated carbon transformations in rivers as they have not considered the interaction of the particulate material on the dissolved concentrations; there could be higher losses than previously estimated, increasing the contribution of peatland headwaters to GHG emissions. In this study, we assessed if the current approach of DOC degradation studies accurately represent the impact of POM on DOC degradation, by quantifying DOC production from POM, and therefore POC, over time in water with manipulated POM concentrations. Both filtered and unfiltered water lost 60% of the DOC over 70 hours, whereas the treatment with additional POM lost only 35%. The results showed that filtering does not significantly impact the DOC degradation rates; however, when the POC concentration was doubled, there was a significant reduction in DOC degradation, suggesting that filtering would still be necessary to get accurate rates of DOC transformations in waters with high POC concentrations.
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10 – 地表和地下溶解有机碳
影响因子：
4
作者：
L. Kaplan;J. Newbold
通讯作者：
J. Newbold
影响因子：
4.5
作者：
Eddie von Wachenfeldt;S. Sobek;D. Bastviken;L. Tranvik
通讯作者：
Eddie von Wachenfeldt;S. Sobek;D. Bastviken;L. Tranvik
英国环境变化网络 (ECN) 流水化学数据：1992-2015
影响因子：
5
作者：
S. Rennie;J. Adamson;R. Anderson;C. Andrews;J. Bater;N. Bayfield;K. Beaton;D. Beaumont;S. Benham;V. Bowmaker;C. Britt;R. Brooker;D. Brooks;J. Brunt;G. Common;R. Cooper;S. Corbett;N. Critchley;P. Dennis;J. Dick;B. Dodd;N. Dodd;N. Donovan;J. Easter;M. Flexen;A. Gardiner;D. Hamilton;P. Hargreaves;M. Hatton;M. Howe;J. Kahl;M. Lane;S. Langan;D. Lloyd;B. McCarney;Y. McElarney;C. McKenna;S. McMillan;F. Milne;L. Milne;M. Morecroft;M. Murphy;A. Nelson;H. Nicholson;D. Pallett;D. Parry;I. Pearce;G. Pozsgai;R. Rose;S. Schafer;T. Scott;L. Sherrin;C. Shortall;Pete Smith;R. Smith;R. Tait;C. Taylor;M. Taylor;M. Thurlow;A. Turner;K. Tyson;H. Watson;M. Whittaker;C. Wood
通讯作者：
C. Wood
DOI：
10.1016/j.scitotenv.2007.11.002
发表时间：
2008-10
期刊：
The Science of the total environment
影响因子：
--
作者：
Joanna M. Clark;S. Lane;P. Chapman;J. Adamson
通讯作者：
Joanna M. Clark;S. Lane;P. Chapman;J. Adamson
影响因子：
18.3
作者：
Evans, Chris D.;Futter, Martyn N.;Kothawala, Dolly N.
通讯作者：
Kothawala, Dolly N.