Millimeter-scale vertical distribution of bacterial groups involved in nitrogen, iron and sulfur cycling and its potential influence on the migration and transformation of nitrogen and phosphorus in sediments of Meiliang Bay, Lake Taihu

被引：0

作者：

Fan X. ^{[1
]}

Gao S. ^{[1
,2
]}

Ding S. ^{[1
]}

机构：

[1] State Key Laboratory of Lake and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing

[2] Hunan Institute of Microbiology, Changsha

来源：

Hupo Kexue/Journal of Lake Sciences | 2023年 / 35卷 / 03期

关键词：

bacteria; diffusive gradients in thin films (DOT); high-resolution dialysis (HR-Peeper); Lake Taihu sediments; Millimeter-scale vertical distribution; nitrogen and phosphorus;

D O I：

10.18307/2023.0309

中图分类号：

学科分类号：

摘要：

In this study, sediment cores were collected in Meiliang Bay, Lake Taihu. The surface 50 mm sediment were sliced at 2 mm section using the self-made device to analyze the vertical distribution of bacterial communities in sediment with high-throughput sequencing technology. High-resolution dialysis and diffusive gradients in thin films technology (DOT) with resolution of millimeter were used to analyze the vertical distribution of dissolved and DCT-labiie ammonium nitrogen (NH+4-N), nitrate nitrogen (NO-3-N), Fe and P. Results indicated that the composition of bacterial community, concentrations of dissolved and DCT-labile NH+4-N, NO-3-N, Fe and P changed significantly across the sediment depth. Bacterial nitrate reduction process mainly occurred at the sediment depth from -16 mm to 0 mm, which should cause an obvious decrease in the concentrations of dissolved and DCT-labile NO-3-N in this sediment depth. Bacterial iron reduction process mainly distributed in the sediment depth from -32 mm to -18 mm, while bacterial sulfate reduction process mainly dominated in the sediment depth from -50 mm to -34 mm. Bacterial sulfate reduction was the main cause for the significant increase of dissolved and DGT-labile Fe and P concentrations in the sediment depth from -32 mm. This study has deepened the understanding of the bacterial influence on the vertical migration and transformation of nitrogen and phosphorus in eutrophic lake sediments. © 2023 by Journal of Lake Sciences.

引用

页码：854 / 862

页数：8

共 20 条

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