Different Responses of Dissolved Black Carbon and Dissolved Lignin to Seasonal Hydrological Changes and an Extreme Rain Event

被引:46
|
作者
Bao, Hongyan [1 ]
Niggemann, Jutta [2 ]
Huang, Dekun [3 ]
Dittmar, Thorsten [2 ]
Kao, Shuh-Ji [1 ]
机构
[1] Xiamen Univ, Coll Ocean & Earth Sci, State Key Lab Marine Environm Sci, Xiamen, Peoples R China
[2] Carl von Ossietzky Univ Oldenburg, ICBM MPI Bridging Grp, Res Grp Marine Geochem, Inst Chem & Biol Marine Environm ICBM, Oldenburg, Germany
[3] SOA, Inst Oceanog 3, Lab Marine Isotop Technol & Environm Risk Assessm, Xiamen, Peoples R China
基金
中国国家自然科学基金;
关键词
extreme rain event; dissolved black carbon; dissolved lignin; dissolved organic matter; ORGANIC-MATTER; MICROBIAL-DEGRADATION; MOLECULAR EVIDENCE; TEMPORAL VARIATION; STORM-EVENT; RIVER; PARTICULATE; FLUX; OXIDATION; CHARCOAL;
D O I
10.1029/2018JG004822
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Hydrology, especially extreme hydrological events, has been recognized as an important driver of the land-to-ocean export of terrigenous dissolved organic matter (tDOM). Nevertheless, how various types of tDOM that differ in source and reactivity respond to changes in hydrology is not known. Seasonal and event exports of dissolved organic carbon (DOC), dissolved black carbon (DBC), and dissolved lignin were studied in a small subtropical river. We found that seasonal variations in DBC concentration were significantly related to hydrology, while DOC and dissolved lignin were not. In contrast, DOC, DBC, and dissolved lignin changed similarly during an extreme rain event. The variation magnitudes of DOC, DBC, and dissolved lignin concentrations were in the lower end compared to other rivers, which may be related to the limited coverage of wetlands and riparian vegetation and poor development of organic-rich soil. Dilution effects were observed when the runoff exceeded 0.4mm/hr, and the fluxes of both DBC and dissolved lignin decreased during the runoff peak, which was caused by surface flow and potentially by removal processes during peak discharge. Our results suggest that the influence of hydrology varies with tDOM source and reactivity and that high enough runoff (e.g., 0.7mm/hr in the Jiulong River) may not enhance the export rate of tDOM. However, our study was carried out in a small watershed with limited wetlands and riparian vegetation, and more studies are needed to verify whether this trend is consistent among global rivers.
引用
收藏
页码:479 / 493
页数:15
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