Overland flow during a storm event strongly affects stream water chemistry and bacterial community structure

Le Huong T.; Pommier Thomas; Ribolzi OlivierSoulileuth BounsamayHuon SylvainSilvera NorbertRochelle-Newall Emma

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Overland flow during a storm event strongly affects stream water chemistry and bacterial community structure

机译：Overland flow during a storm event strongly affects stream water chemistry and bacterial community structure

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As flood events are expected to become more frequent due to climate change, investigating how overland flow exports terrestrial nutrients, carbon and living organisms into aquatic systems is essential for understanding both soil and stream ecosystem status. Here we assessed how dissolved organic carbon (DOC), total suspended sediments (TSS), and stream bacterial diversity responded to stream discharge and overland flow during stormflow in a tropical catchment. A higher humification index and a decreasing ratio of allochthonous to autochthonous DOC indicated that DOC from soils was exported to stream during the flood. The delta C-13 and delta N-15 of particulate matter was indicative of a source in the cultivated areas of the upper catchment and of subsurface soils (stream banks and gullies) in the downstream section. Bacterial richness of particle-attached (PA) and the free-living (FL) fractions increased with the flood progression in the upstream section. Moreover, the community structure of the PA fraction in the stream was more similar to that of overland flow than was the FL fraction. This suggests that the soil PA bacterial community was washed-out with overland flow during the flood recession. The relative contribution of sources and the composition of TSS, rather than hydrological regime, significantly drove the composition of bacterial community. In conclusion, our results emphasize that overland flow during a flood event strongly influences the structure of stream bacterial communities further underlining the biological connectivity between terrestrial runoff and stream flow.

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《Aquatic sciences》 |2022年第1期|7.1-7.16|共16页
作者
Le Huong T.; Pommier Thomas; Ribolzi OlivierSoulileuth BounsamayHuon SylvainSilvera NorbertRochelle-Newall Emma;
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作者单位

Univ Lyon, Univ Claude Bernard Lyon 1, UMR Ecol Microbienne, VetAgro Sup,CNRS,INRAE, F-69622 Villeurbanne, France|Vietnam Acad Sci & Technol, Inst Environm Technol, Hanoi, Vietnam|Sorbonne Univ, Univ Paris Est Creteil, Inst Ecol & Environm Sci Paris iEES;

Univ Lyon, Univ Claude Bernard Lyon 1, UMR Ecol Microbienne, VetAgro Sup,CNRS,INRAE, F-69622 Villeurbanne, France;

Geosci Environm Toulouse GET, UMR CNRS UPS IRD 5563, 14 Ave Edouard Belin, F-31400 Toulouse, FranceSorbonne Univ, Univ Paris Est Creteil, Inst Ecol & Environm Sci Paris iEES Paris, INRAE,IRD,CNRS, 4 Pl Jussieu, F-75005 Paris, FranceIRD, BP 5992, Ban Sisangvone, Vientiane, Laos|Sorbonne Univ, Univ Paris Est Creteil, Inst Ecol & Environm Sci Paris iEES Paris, Ctr IRD Ile France,IRD,CNRS,INRAE, 32 Ave Henri Varagnat, F-93143 Bondy, FranceIRD, BP 5992, Ban Sisangvone, Vientiane, Laos;

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收录信息美国《科学引文索引》(SCI);
原文格式 PDF
正文语种英语
中图分类
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DOC; CDOM; Lao PDR (Laos); Southeast Asia; Land degradation; Sustainability;

Overland flow during a storm event strongly affects stream water chemistry and bacterial community structure

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