基于氨基酸指示的典型浅水湖泊（白洋淀）表层沉积物中有机质降解的季节性变化规律研究
Amino acids as indicators of seasonal variations inorganic matter degradation in surface sediments from a shallow lake
Yan Wen, Wenqiang Zhang*, Baoqing Shan*
https://doi.org/10.1016/j.jes.2022.10.043
摘要
湖泊沉积物中有机质（OM）的降解是湖泊营养循环和沉积过程中的关键环节。本研究旨在探究季节性温度变化下浅水湖泊（中国白洋淀）表层沉积物中有机质的降解情况。为此我们采用了基于氨基酸的有机质降解指数（DI）以并分析了沉积物有机质的时空分布特征和来源。沉积于湖泊中的有机质主要来源于淡水水生植物和陆生 C4 植物。本研究中部分采样点的沉积物受到周围农作物的影响。沉积物中有机碳和总氮含量以及总水解氨基酸浓度在夏季最高，冬季最低。春季 DI 值最低，表明春季表层沉积物中的有机碳降解程度高且相对稳定；冬季 DI 值最高，表明冬季沉积物较为新鲜。上覆水水温与有机碳含量（p < 0.01）和总水解氨基酸浓度（p < 0.05）呈正相关。上覆水水温的季节性变化对湖泊沉积物中有机质的降解有很大影响。本研究结果将有助于在气候变暖的情况下管理和修复因内源释放有机质而受损的湖泊沉积物。
亮点
季节性温度变化能够影响浅水湖泊表层沉积物有机质降解程度。
Abstract
Degradation of organic matter (OM) in sediments is a key link in nutrient cycling and sedimentation processes in lakes. The aim of this study was to explore the degradation of OM in surface sediments of a shallow lake (Baiyangdian Lake, China) under seasonal temperature variations. For this, we used the amino acid-based degradation index (DI) and the spatiotemporal distribution characteristics and sources of OM. Sediment OM in the lake mainly originated from freshwater aquatic plants and terrestrial C4 plants. The sediment at some sampling sites was affected by surrounding crops. The organic carbon and total nitrogen contents, and the total hydrolyzed amino acid concentrations in the sediments were highest in summer and lowest in winter. The lowest DI occurred in spring, which indicated that the OM in the surface sediment at this time was highly degraded and relatively stable, and the highest DI occurred in winter, which showed that the sediment was fresh. The water temperature was positively correlated with the organic carbon content (p < 0.01) and total hydrolyzed amino acids concentration (p < 0.05). Seasonal variations in the overlying water temperature had a large effect on OM degradation in the lake sediments. Our results will facilitate the management and restoration of lake sediments that suffer from endogenous release of OM in a warming climate.
作者简介
第一作者
文艳博士于2023年在中科院生态环境研究中心获得工学博士学位。现任华北理工大学建筑工程学院给排水科学与工程系讲师。主要从事流域水环境生态修复与氮的生物地球化学循环过程等相关研究。在环境科学、JES等期刊上发表研究论文3篇。
通讯作者
单保庆，流域水环境专家，理学博士，中国科学院生态环境研究中心研究员，博士生导师，九三学社会员；曾担任国家水专项河流主题组长；国家中青年科技创新领军人才、国家“万人计划”领军人才；河北省生态环境厅暨雄安新区生态环境局“白洋淀水生态修复保护专家组组长”、河北省生态环境厅咨询委员会专家、内蒙古草原英才；主要从事流域水环境治理与水体生态修复工程技术和理论研究。兼任《环境保护科学》杂志副主编、《Environmental Science and Ecotechnology》执行副主编、发表论文200余篇，申请专利10余项目。
张文强博士于2014年在中科院生态环境研究中心获得工学博士学位。现任中科院生态环境研究中心环境水质学国家重点实验室副研究员。在职期间到加拿大Agriculture and Agri-Food Canada交流访问。主要从事流域水污染控制与磷的生物地球化学循环过程及效应等相关研究。在Sci. Total Environ.、Chemosphere、Environ. Res.、ACS EST Water等期刊发表文章50余篇，申请专利技术7项。
原文链接
https://www.sciencedirect.com/science/article/pii/S1001074222005411
引用格式
Yan Wen, Wenqiang Zhang, Baoqing Shan, 2024. Amino acids as indicators of seasonal variations inorganic matter degradation in surface sediments from a shallow lake. J. Environ. Sci. 131, 1-10.
