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Hydrological alteration drives chemistry of dissolved organic matter in the largest freshwater lake of China (Poyang Lake).
Xu, Lei; Hu, Qian; Liu, Zetian; Jian, Minfei; Peng, Yansong; Shen, Ruichang; Liao, Wei; Zhong, Aiwen.
Afiliación
  • Xu L; Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332900, China.
  • Hu Q; Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332900, China.
  • Liu Z; Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332900, China.
  • Jian M; College of Life Science, Jiangxi Provincial Key Laboratory of Protection and Utilization of Subtropical Plant Resources, Jiangxi Normal University, Nanchang, 330022, China.
  • Peng Y; Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332900, China.
  • Shen R; Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity, Center for Watershed Ecology, School of Life Science, Nanchang University, Nanchang 330031, China; Jiangxi Poyang Lake Wetland Conservation and Restoration National Permanent Scientific Research Base, National Ecosystem
  • Liao W; Wetland Research Center, Jiangxi Academy of Forestry, Nanchang, 330032, China. Electronic address: lovy21@163.com.
  • Zhong A; Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332900, China. Electronic address: zhongaw@lsbg.cn.
Water Res ; 251: 121154, 2024 Mar 01.
Article en En | MEDLINE | ID: mdl-38271743
ABSTRACT
As the largest reactive organic carbon pool, dissolved organic matter (DOM) plays an important role in various biogeochemical processes in lake ecosystems. Recently, climate change-induced extreme events (e.g., floods and droughts) have significantly modified the hydrological patterns of lakes worldwide, and regulated the quality and quantity of DOM. However, the responses of DOM chemistry to hydrological alteration in lakes remain poorly understood. Here we investigated the influences of hydrological alteration on sources, composition, and characteristics of DOM in Poyang Lake, the largest freshwater lake in China, using a combination of bulk chemical, optical and Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) techniques. Results show various sources of DOM (autochthonous, allochthonous, and anthropogenic inputs) and significant variations in DOM chemistry across four hydrological periods (the retreating, dry, rising, and flooding periods) in Poyang Lake. During the retreating, rising, and flooding periods, DOM was characterized by higher aromaticity, humification degree, and recalcitrance, and exhibited pronounced allochthonous signatures. In contrast, DOM contained more S-containing molecules and aliphatic compounds during the dry period, displaying relatively stronger autochthonous features. Terrestrial inputs and the lignin-CHOS formation process are likely the primary underlying mechanisms shaping the differences in DOM chemistry in Poyang Lake. Our research demonstrates the significant impacts of hydrological alteration on DOM dynamics, and provides an improved understanding of DOM biogeochemical cycles and carbon cycling in large aquatic systems under global climate change.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Lagos / Materia Orgánica Disuelta País/Región como asunto: Asia Idioma: En Revista: Water Res Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Lagos / Materia Orgánica Disuelta País/Región como asunto: Asia Idioma: En Revista: Water Res Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido