Characteristics of water dissolved organic matter in Zoige alpine wetlands, China

IF 5.2 2区农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY Chemical and Biological Technologies in Agriculture Pub Date : 2024-08-29 DOI:10.1186/s40538-024-00652-3

Jinzhi Wang, Zhengyi Hu, Lijuan Cui, Weishan Yang, Wei Li, Yinru Lei, Jing Li, Xiajie Zhai, Xinsheng Zhao, Rumiao Wang

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Abstract

Background

Dissolved organic matter (DOM) plays a significant role in the biogeochemical cycle of crucial elements in aquatic ecosystem. However, it is still not clear on the spectral characteristics of water DOM in different types of alpine wetlands, which have less anthropogenic influences and intensive ultraviolet radiation. Here, we collected 107 water samples from marsh, lake, and river wetlands in the Zoige plateau, China, and analyzed the chemical characteristics, compositions, and potential sources of chromophoric DOM by combining UV–vis spectroscopy and excitation–emission matrix fluorescence spectroscopy coupled with parallel factor analysis (EEMs-PARAFAC).

Results

UVC and UVA fulvic-like substances were the prevailing fluorescence components in water DOM, which accounted for 23.74–71.59% and 16.76–30.01% of the total fluorescence intensity, respectively. Compared with the lake and river wetlands, fluoresce intensities of UVC and UVA fulvic-like substances in DOM were higher in marsh wetland. Marsh wetlands possessed the highest SUVA₂₅₄, E2/E3, E2/E4, and E4/E6 of DOM, suggesting higher humification degree, higher relative molecular nominal size, and higher aromaticity. And the E2/E4 ratios in most water samples were higher than 12, indicating water DOM was mainly derived from autochthonous sources in alpine wetlands.

Conclusions

Wetland types strongly affected the spectral characteristics of water DOM in Zoige plateau. These findings may be beneficial for sustainable management of alpine wetlands.

Graphical Abstract

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中国卓戈高山湿地水溶有机物的特征

背景溶解有机物（DOM）在水生生态系统关键元素的生物地球化学循环中发挥着重要作用。然而，在人为影响较小、紫外线辐射较强的不同类型的高山湿地中，水体溶解有机物的光谱特征尚不清楚。本文采集了中国卓资高原沼泽、湖泊和河流湿地的107个水样，结合紫外-可见光谱和激发-发射矩阵荧光光谱并行因子分析（EEMs-PARAFAC）方法，分析了水体DOM的化学特征、组成和潜在来源。结果UVC和UVA类富勒烯物质是水体DOM的主要荧光成分，分别占总荧光强度的23.74%-71.59%和16.76%-30.01%。与湖泊和河流湿地相比，沼泽湿地 DOM 中 UVC 和 UVA 类富营养化物质的荧光强度较高。沼泽湿地中 DOM 的 SUVA254、E2/E3、E2/E4 和 E4/E6 值最高，表明其腐殖化程度较高、相对分子标称尺寸较大、芳香度较高。结论湿地类型对卓戈高原水体 DOM 的光谱特征有很大影响。这些发现可能有利于高寒湿地的可持续管理。

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来源期刊

Chemical and Biological Technologies in Agriculture Biochemistry, Genetics and Molecular Biology-Biotechnology

CiteScore

6.80

自引率

3.00%

发文量

审稿时长

15 weeks

期刊介绍： Chemical and Biological Technologies in Agriculture is an international, interdisciplinary, peer-reviewed forum for the advancement and application to all fields of agriculture of modern chemical, biochemical and molecular technologies. The scope of this journal includes chemical and biochemical processes aimed to increase sustainable agricultural and food production, the evaluation of quality and origin of raw primary products and their transformation into foods and chemicals, as well as environmental monitoring and remediation. Of special interest are the effects of chemical and biochemical technologies, also at the nano and supramolecular scale, on the relationships between soil, plants, microorganisms and their environment, with the help of modern bioinformatics. Another special focus is the use of modern bioorganic and biological chemistry to develop new technologies for plant nutrition and bio-stimulation, advancement of biorefineries from biomasses, safe and traceable food products, carbon storage in soil and plants and restoration of contaminated soils to agriculture. This journal presents the first opportunity to bring together researchers from a wide number of disciplines within the agricultural chemical and biological sciences, from both industry and academia. The principle aim of Chemical and Biological Technologies in Agriculture is to allow the exchange of the most advanced chemical and biochemical knowledge to develop technologies which address one of the most pressing challenges of our times - sustaining a growing world population. Chemical and Biological Technologies in Agriculture publishes original research articles, short letters and invited reviews. Articles from scientists in industry, academia as well as private research institutes, non-governmental and environmental organizations are encouraged.