红树林间隙水溶解态陆源有机质的光降解和生物降解行为分析

鲍红艳; 吴莹; 张经

doi:10.3969/j.issn.0253-4193.2013.03.017

红树林间隙水溶解态陆源有机质的光降解和生物降解行为分析

doi: 10.3969/j.issn.0253-4193.2013.03.017

华东师范大学河口海岸学国家重点实验, 上海 200062

基金项目: 基金委创新研究群体项目(41021064);国家自然基金委重点项目(40830850);国家自然基金委项目(41076052);国家自然基金委项目(41276081);华东师范大学海外研修基金。

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出版历程
- 收稿日期: 2012-10-09
- 修回日期: 2013-02-28

Photo-and Bio-degradation of dissolved organic matter in mangrove pore-water

State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

摘要

摘要: 红树林输送的溶解态陆源有机质是海洋中陆源有机质的主要来源之一,对其光降解和生物降解过程的研究有助于进一步了解红树林生态系统输出的有机质在近岸的归宿以及对近岸水体生物地球化学过程的影响,因此于2010年4月在海南省清澜港红树林采集间隙水,并进行了光降解和生物降解培养实验。分析了光培养(光降解)和暗培养过程(生物降解)中溶解态有机碳(DOC)、细菌以及溶解态木质素等的变化。结果显示经历128 d的暗培养后,DOC由初始的2 216 μmol/L下降至718 μmol/L,表明红树林间隙水的生物可利用性约为70%左右;经历11 d的自然光照后,DOC下降至800 μmol/L。木质素在光降解过程中的移除速率(-0.132 d^-1)远高于生物降解过程(-0.008 d^-1)。光培养中,木质素的下降速率高于总体DOC。不同系列溶解态木质素的下降速率不同,随着培养的进行,紫丁香基酚类(S)与香草基酚类(V)的比值(S/V)呈下降趋势,而V系列的酸醛比值((Ad/Al)v)呈上升的趋势。对比光培养和暗培养过程中DOC和木质素的变化可以得出生物消耗是引起红树林间隙水DOC从水体中移除的主要因素;而光照则是陆源有机质从水体中移除的主要因素;光培养和暗培养过程中细菌变化的差异表明光照可以促进细菌对溶解态有机碳的利用。与其他地区比较发现,海南红树林间隙水的光降解速率与热带河流(刚果河)相近,高于温带密西西比河流,降解过程中各参数的变化[S/V和(Ad/Al)v]与其他区域接近。
- 光降解 /
- 生物降解 /
- 溶解态有机质 /
- 木质素 /
- 红树林
Abstract: Terrestrial dissolved organic matter (DOM) exported from mangrove comprises an important fraction of terrestrial DOM in the ocean. The study of photo-and bio-degradation of mangrove DOM can help better understanding the fate of mangrove DOM and the role of mangrove DOM in the coastal biogeochemical cycle. Therefore, mangrove pore-water samples were collected in April 2010 to perform the photo-and bio-degradation of mangrove DOM. Dissolved organic carbon (DOC), density of bacteria and dissolved lignin phenols were measured in light(photo-degradation) and dark incubation (bio-degradation), respectively. The results showed that after 128 d dark incubation, DOC decreased from 2 216 μmol/L to 718 μmol/L, indicating that the bioavailability of mangrove pore-water DOC was approximately 70%; after 11 days exposure to the natural sunlight, DOC decreased from 2216 μmol/L to 800 μmol/L. The degradation rates of lignin phenols were much higher in light incubation(-0.132 d^-1) than dark incubation(-0.008 d^-1).During the light incubation, the degradation rates of lignin phenols were higher than DOC. The rates of photo-degradation of lignin phenols were different among different lignin groups, with the increase of sunlight exposure, the ratio of syringyl (S) phenols to vanillyl (V) phenols decreased and the ratio of vanillic acid to vanillin (Ad/Al)v increased. The comparison of the variations of DOC and lignin phenols during photo-and bio-degradation suggested that microbial consumption was the major factor for the removal of mangrove DOC and photo-degradation was the major factor for the removal of terrestrial DOM in water column. The comparison of the variations of bacteria during photo-and bio-degradation implied that light can improve the utilization of DOC by bacteria. The degradation rate of lignin in mangrove forest was close to Congo River sample, but higher than that of Mississippi River samples. However, the trends of S/V and (Ad/Al)v were similar as other regions.
- photo-degradation /
- bio-degradation /
- dissolved organic matter /
- lignin phenols /
- mangrove

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