Wind induced algal migration manipulates sediment denitrification N-loss patterns in shallow Taihu Lake, China

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
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
Identifiers:
NumberType
10.1016/j.watres.2021.117887DOI
S0043135421010812Publisher Item Identifier
1498950Other
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Record created by: Jonathan Gallacher
Date Added: 30 Nov 2021 11:27
Last Modified: 30 Nov 2021 11:27
URI: http://irep.ntu.ac.uk/id/eprint/45005

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