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Vertical Profile Characteristics of Dissolved Organic Matter Biochemistry in the Tropical Reservoir Shaped by Hydrodynamic Forces

文献类型： 外文期刊

作者： Liu, Zongyue 1 ; Chen, Miao 1 ; Liu, Huiran 2 ; Wang, Han 1 ; Ning, Ziyu 1 ; Zhang, Wen 1 ; Liu, Yuqin 1 ; Tang, Min 6 ;

作者机构： 1.Hainan Univ, Coll Ecol, Haikou 570228, Peoples R China

2.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Key Lab Low Carbon Green Agr Trop Reg China, Minist Agr & Rural Affairs, Haikou 571101, Peoples R China

3.Hainan Danzhou Trop Agroecosystem Natl Observat &, Danzhou 571737, Peoples R China

4.Hainan Key Lab Trop Ecocircular Agr, Haikou 571101, Peoples R China

5.Natl Long Term Expt Stn Agr Green Dev, Natl Agr Expt Stn Agr Environm, Danzhou 571737, Peoples R China

6.Hainan Univ, Coll Marine Sci & Engn, Haikou 570228, Peoples R China

关键词： hydrodynamic force; tropical reservoir; dissolved organic matter; biochemistry; spatial distribution

期刊名称：WATER （ 影响因子：3.0； 五年影响因子：3.3 ）

ISSN：

年卷期： 2025 年 17 卷 2 期

页码：

收录情况： SCI

摘要： Dissolved organic matter (DOM) exerts a crucial role in biogeochemical processes and ascertaining water quality in reservoirs, where it is vulnerable to the dynamic impacts of surface water inflows. However, understanding how DOM quantity and biochemical features responds to hydrodynamic forces in tropical reservoirs remains limited. To enhance our understanding of the vertical profiles of DOM characteristics under varying hydrodynamic forces (strong, moderate, and weak regions) in the Chitian Reservoir (18 degrees 43 '-18 degrees 42 ' N, 109 degrees 68 '-109 degrees 70 ' E), in December 2023, we investigated the concentrations and biochemical characteristics of water column DOM samples using multispectral techniques, a parallel factor model, and two-dimensional correlation analysis. Our results indicated that DOM concentrations (4.34 +/- 0.36 mg/L) are the highest in the reservoir center, whereas total nitrogen (0.52 +/- 0.04 mg/L), total phosphorus (0.02 +/- 0.03 mg/L), and nitrate nitrogen (1.01 +/- 0.07 mg/L) present their highest values in the inlet region. As hydrodynamic force decreases, microbial activity increases, whereas DOM's humification degree and molecular weight decline. DOM in the Chitian Reservoir comprises humic-like components, including three terrestrial sources (accounting for 85.38%similar to 87.03%) and one microbial source, with dominant characteristics of allochthonous origin. The relative abundance of microbial components decreased from 14.62% to 12.97% with the increasing hydrodynamic force and increased with depth. DOM functional groups in the strong hydrodynamic force region and the reservoir's upper layer show high consistency and uniformity. Phenolic O-H is the most reactive functional group concerning changes in water depth across all hydrodynamic areas, followed by polysaccharide C-O, owing to its high photoactivity. In contrast, aromatic C-H demonstrates the weakest reactivity. DOM's spectral features are closely linked to nutrient form concentrations (N and P).

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