典型高原深湖150年有机碳沉积

IF 12.4 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Water Research Pub Date : 2025-06-01 DOI:10.1016/j.watres.2025.123944

Chungui Yu , Shanmeng Han , Xuetao Guo , Xiaofeng Cao , Gaoqi Duan , Jianfeng Peng , Huijuan Liu , Jiuhui Qu

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引用次数: 0

摘要

湖泊是水体，其有机碳沉积是陆地生态系统中重要的碳库之一。这些碳库的特征、规模和变化与气候问题和人类活动密切相关。以澄海湖为代表，采用同位素、化学生物标志物等方法和24项指标，系统研究了澄海湖OC沉积的分布、性质和来源。结果表明，湖泊沉积物OC沉积分布格局可分为两种类型，即底层（48.8 ~ 38.4 cm）相对稳定阶段，中层（38.4 ~ 16.8 cm）和表层（16.8 ~ 0 cm） OC沉积上升阶段，OC沉积稳定在5.00 g m-2 yr-1以下，从5.00 g m-2 yr-1增加到21.87 g m-2 yr-1。OC沉积的化学组成表明，底层具有较高的芳香性、疏水性和相对分子量。腐植酸、黄腐酸和蛋白质样成分均从湖底向表层上升。植物（47.7 ~ 82.0%）是主要的OC来源。C₃植物主要在底层，而微生物和藻类在中层和表层贡献更多。由于气候变暖和人为活动的干扰，OC沉降波动较大。本研究有望为重建高原湖泊OC沉积提供全面的科学参考，为防治高原湖泊富营养化、评价和减少高原湖泊二氧化碳排放奠定良好的基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Organic carbon deposition of a typical plateau deep lake across 150 years

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Organic carbon deposition of a typical plateau deep lake across 150 years

Lakes are waterbodies, and their organic carbon (OC) depositions are one of the important C pools in the terrestrial ecosystem. The characteristics, size and change of these C pools are closely related to climate issues and human activities. Here Lake Chenghai was chosen as a representative, and the distribution, property and source of OC deposition were systematically investigated using isotopes and chemical biomarkers methods and 24-index indicators. The results showed that distribution pattern of OC deposition could be divided into two types, including a relative stable stage in the bottom layer (48.8–38.4 cm), and an upswing stage in the middle layer (38.4–16.8 cm) and surface layer (16.8–0 cm) of lake sediments, where the OC deposition was stable below 5.00 g m^-2yr^-1, and increased from 5.00 to 21.87 g m^-2yr^-1, respectively. The chemical composition of OC deposition showed that the bottom layer had higher aromaticity, hydrophobicity and the relative molecular weight. The three components, i.e. humic acid, fulvic acid and protein-like component, all rose from the bottom to the surface of lake sediment. Plants (47.7–82.0 %) were the main OC source. C₃ plants dominated the bottom layer, while microorganisms and algae contributed more to the middle and surface layers. The OC deposition fluctuated largely due to the disturbance from warming and anthropogenic activities. This study is expected to provide comprehensive scientific references for reconstructing OC deposition of plateau lake, and lay a good foundation for preventing and controlling plateau lake eutrophication, and evaluating and reducing carbon dioxide emission in plateau lake.

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来源期刊

Water Research 环境科学-工程：环境

CiteScore

20.80

自引率

9.40%

发文量

1307

审稿时长

38 days

期刊介绍： Water Research, along with its open access companion journal Water Research X, serves as a platform for publishing original research papers covering various aspects of the science and technology related to the anthropogenic water cycle, water quality, and its management worldwide. The audience targeted by the journal comprises biologists, chemical engineers, chemists, civil engineers, environmental engineers, limnologists, and microbiologists. The scope of the journal include: •Treatment processes for water and wastewaters (municipal, agricultural, industrial, and on-site treatment), including resource recovery and residuals management; •Urban hydrology including sewer systems, stormwater management, and green infrastructure; •Drinking water treatment and distribution; •Potable and non-potable water reuse; •Sanitation, public health, and risk assessment; •Anaerobic digestion, solid and hazardous waste management, including source characterization and the effects and control of leachates and gaseous emissions; •Contaminants (chemical, microbial, anthropogenic particles such as nanoparticles or microplastics) and related water quality sensing, monitoring, fate, and assessment; •Anthropogenic impacts on inland, tidal, coastal and urban waters, focusing on surface and ground waters, and point and non-point sources of pollution; •Environmental restoration, linked to surface water, groundwater and groundwater remediation; •Analysis of the interfaces between sediments and water, and between water and atmosphere, focusing specifically on anthropogenic impacts; •Mathematical modelling, systems analysis, machine learning, and beneficial use of big data related to the anthropogenic water cycle; •Socio-economic, policy, and regulations studies.