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Shi, W., Zhu, L., Van Dam, B., Smyth, A.R., Deng, J., Zhou, J., Pan, G. 
ORCID: 0000-0003-0920-3018, Yi, Q., Yu, J. and Qin, B.,
2022.
Wind induced algal migration manipulates sediment denitrification N-loss patterns in shallow Taihu Lake, China.
Water Research, 209: 117887.
ISSN 0043-1354
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Abstract
Driven by winds, the distribution of algae is often noticeably patchy at kilometer scales in shallow lakes. The decomposition of the settled algal biomass may affect nitrogen (N) biogeochemical cycles and thereby N loss in sediments. In this study, we investigated sediment denitrification N-loss patterns along algal migration pathway in Taihu Lake, a shallow and eutrophic lake in China, and found that wind-induced algal migration in the overlying water manipulated the temporal and spatial patterns of denitrification N-loss in sediments. A N loss hotspot in sediments was created in the algae concentrated zone, where N loss was, however, temporarily inhibited during algal bloom seasons and generally exhibited a negative relationship with algal biomass. In the zone where algae have left, sediment N loss rate was relatively low and positively correlated with algal biomass. The decay of algal biomass generated organic carbon and created anoxia, favoring denitrification, while excessive algal biomass could deplete oxygen and inhibit nitrification, causing nitrate limitation for denitrification. Piecewise linear regression analysis indicated that algal biomass of Chl-a > 73.0 μg/L in the overlying water could inhibit denitrification N-loss in sediments. This study adds to our understanding of N biogeochemical cycles in shallow eutrophic lakes.
| Item Type: | Journal article | ||||||||
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| Publication Title: | Water Research | ||||||||
| Creators: | Shi, W., Zhu, L., Van Dam, B., Smyth, A.R., Deng, J., Zhou, J., Pan, G., Yi, Q., Yu, J. and Qin, B. | ||||||||
| Publisher: | Elsevier | ||||||||
| Date: | 1 February 2022 | ||||||||
| Volume: | 209 | ||||||||
| ISSN: | 0043-1354 | ||||||||
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| Divisions: | Schools > School of Animal, Rural and Environmental Sciences | ||||||||
| Record created by: | Jonathan Gallacher | ||||||||
| Date Added: | 30 Nov 2021 11:27 | ||||||||
| Last Modified: | 21 Nov 2022 03:00 | ||||||||
| URI: | https://irep.ntu.ac.uk/id/eprint/45005 |
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