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eISSN: 2083-5906
ISSN: 1230-1485
ISSN: 1230-1485
ORIGINAL RESEARCH
Sediment DOM Fluorescence Characteristics
in Lake Wetlands: Effects of Vegetation
and Relationships with Bacterial Communities
1
Heilongjiang Province Key Laboratory of Cold Region Wetland Ecology and Environment Research,
Harbin University, Harbin, China
2
Heilongjiang Academy of Black Soil Conservation and Utilization, Harbin, China
3
Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences,
Beijing, China
Submission date: 2026-01-19
Final revision date: 2026-03-26
Acceptance date: 2026-05-08
Online publication date: 2026-08-06
Corresponding author
KEYWORDS
TOPICS
ABSTRACT
To elucidate the fluorescence characteristics of sediment dissolved organic matter (DOM),
the structural and functional features of bacterial communities, and their coupling relationships under
different vegetation coverage levels, sediment samples from distinct water depth zones of Baiyu Lake
in Harbin, China, were analyzed using three–dimensional fluorescence spectroscopy and high–throughput
sequencing. The results showed that sediment DOM had mixed allochthonous and autochthonous
sources. Zones with helophytes and emergent plants exhibited a higher degree of DOM humification,
higher humic–like fluorescence intensity, and elevated bacterial diversity, relative abundance of taxa,
and OTU numbers associated with C, N, and S cycling. The Mantel test revealed significant correlations
between allochthonous humic–like substances and bacterial community diversity, composition, and
functions, whereas protein–like substances showed no such correlations. The variance partitioning
analysis indicated that humic–like and protein–like substances explained 56.90% and 6.95%
of the variance in the bacterial community, respectively. Collectively, vegetation variations driven by
water depth modulate the complex interactions between sediment DOM and bacterial communities
in lake wetlands.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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| eISSN: | 2083-5906 |
| ISSN: | 1230-1485 |
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