华南中小型闸控入海河流DOM特征及藻源影响

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摘要本研究以华南地区中小型闸控入海河流黄江河、东溪河和练江（三河）为研究对象，于2022年逐月持续监测三河DOM特征，探讨DOM浓度时空分布、来源和藻类大量增殖对其影响.结果表明：黄江河、东溪河和练江溶解有机碳（DOC）占总有机碳（TOC）比例分别为78.6%、81.3%和67.2%， DOC为三河有机碳主要存在形式；三河DOC年均浓度分别为2.6，4.3和5.1mg/L，低于世界河流平均浓度但高于华南地区大型河流.荧光参数结果表明三河DOM具有陆源内源双重特征，内源贡献更明显.利用吸光特征量化藻源DOC贡献，三河藻源DOC浓度分别为1.2， 1.8和2.2mg/L，藻源DOC占比分别为49.6%、42.6%和48.0%，进一步表明藻类内源是三河DOM主要来源.平行因子解析出3种类蛋白组分和2种类腐殖质组分，其中，受藻类异常增殖影响，表征内源类蛋白组分C1和C3总荧光强度枯水期显著高于丰水期，表征来自陆源类腐殖质组分C2和C4总荧光强度呈练江>东溪河>黄江河.因此，藻类大量增殖是三河DOC浓度高于华南地区大型河流、枯水期类蛋白组分C1和C3显著高于丰水期的主要原因之一，外源输入及河流理化参数，包括降雨、温度、盐度和营养盐浓度以及人为干扰（闸控调度）共同影响三河DOM浓度和组分.

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	李丹
	范中亚
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	陈钢
	赵长进
	曾凡棠
	黄露

关键词 ：溶解有机质(DOM), 闸控入海河流, 藻类增殖, 吸光特性, 三维荧光

Abstract：Due to the influence of climate change and human activities, algal blooms frequent occurrences in rivers in South China. Evaluating the concentration, sources and composition of dissolved organic matter (DOM) is of great significance for regional carbon cycle. In this study, we focused on three typical small and medium-sized gate-controlled rivers (Huangjiang River, Dongxi River and Lianjiang River) in South China. From January to December of 2022, the DOM characteristics in these rivers were continuously monitored to investigate the spatial-temporal distribution of DOM concentrations, sources, and the effects of algal blooms. The results show that DOC accounted for 78.6%, 81.3%, and 67.2% of the total organic carbon (TOC) in Huangjiang River, Dongxi River, and Lianjiang River, respectively, being the dominant form of organic carbon. The annual average DOC concentrations in these three rivers were 2.6mg/L, 4.3mg/L, and 5.1mg/L, respectively, which were lower than the average concentration in all world rivers but higher than those in the large rivers in South China. The DOM in the three rivers exhibited characteristics of both terrestrial and endogenous sources, with a more pronounced contribution from endogenous sources. And the algal-derived DOC concentrations in Huangjiang River, Dongxi River, and Lianjiang River were determined to be 1.2mg/L, 1.8mg/L, and 2.2mg/L, or proportionally accounted for 49.6%, 42.6%, and 48.0%, respectively, further indicating that algal blooms were the main contributors to DOM in the three rivers. Fluorescence excitation-emission matrix-parallel factor analysis (EEM-PARAFAC) of DOM in the three rivers revealed three types of protein components and two types of humic substances. Among them, the fluorescence intensity of endogenous protein components C1 and C3 in the dry season was significantly higher than that in the wet season under the influence of algal blooms. The fluorescence intensity of humic substance components C2 and C4, originating from terrigenous humus, showed a pattern of Lianjiang River>Dongxi River>Huangjiang River. Consequently, the massive proliferation of algal was one of the major reasons why the DOC concentration was higher in these three rivers than in larger rivers in South China, and the protein-like components C1and C3were significantly higher in the dry season than those in the wet season. Exogenous inputs and river physical and chemical parameters, including rainfall, temperature, salinity, nutrient concentrations, and anthropogenic interference (e.g., gate control schedules), jointly influenced the concentrations and compositions of DOM in these rivers.

Key words： dissolved organic matter(DOM) gate-controlled seagoing rivers algal blooms absorbence characteristics three-dimensional fluorescence

收稿日期: 2023-06-16

PACS:

X522

基金资助:中央级公益性科研院所基本科研业务专项（PM-zx703-202204-107）；国家重点研发计划项目课题（2022YFC3202203）；广东省重点领域研发计划项目（2020B1111350001）

通讯作者: 黄露,助理研究员,huanglu@scies.org E-mail: huanglu@scies.org

作者简介: 李丹(1990-),女,河南新乡人,工程师,硕士,主要从事水生态环境保护研究.发表论文7篇.lidan@scies.org.

引用本文:

李丹, 范中亚, 罗千里, 贾政博, 陈钢, 赵长进, 曾凡棠, 黄露. 华南中小型闸控入海河流DOM特征及藻源影响[J]. 中国环境科学, 2024, 44(2): 911-922. LI Dan, FAN Zhong-ya, LUO Qian-li, JIA Zheng-bo, CHEN Gang, ZHAO Chang-jin, ZENG Fan-tang, HUANG Lu. Characteristics and algal source effects of dissolved organic matter in small and medium-sized gate-controlled seagoing rivers in South China. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(2): 911-922.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I2/911

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