水源地型河流-水库秋冬季水体CO2排放特征

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中文摘要：河流、水库水体是大气CO2的重要排放源。为探究河流-水库连续型水体CO2动态变化特征，文章以中国东南低山丘陵地区水源地型水库——沙河水库及其主要入库河流平桥河为例，于2022年秋季(9月-11月)、冬季(12月-次年2月)进行逐月采样，采用顶空平衡-气相色谱法和漂浮箱-便携式温室气体分析仪法分别对表层水体CO2溶存浓度和水-气界面CO2排放通量进行观测。分析了平桥河、入库口及沙河水库CO2浓度与通量的时空变化及主要影响因素。结果表明:平桥河-沙河水库连续体的CO2浓度和通量的范围分别为0。034～0。415 mmol/L和-7。835～4。481 mmol/(m2·h);CO2浓度及通量在空间上均表现为人库口显著高于平桥河和沙河水库(P＜0。05)，在季节上表现为秋季显著高于冬季(P＜0。05)。平桥河-沙河水库连续体不同区域水体CO2动态的影响因素差异较大，在平桥河主要受DO和pH的影响，在入库口主要受DO、pH和NH4+-N的影响，在沙河水库主要受水温、DO、pH、Chl-a、PO43--P、TP、DOC和DIC的影响。研究表明，河流、入库口和水库CO2排放及影响因素具有较强的时空异质性，全面考虑水源地型河流-水库连续体不同区域水体CO2动态变化特征有利于提升区域碳收支估算的准确性。

外文标题：Characteristics of CO2 Emission from Water Source River and Reservoir in Autumn and Winter

外文摘要：Rivers and reservoirs are important sources of atmospheric CO2 emissions.In order to investigate the dynamics of CO2 in a river-reservoir continuum,we analyzed the spatial and temporal changes in CO2 concentration and flux and its influencing factors of Pingqiao River,the reservoir inlet,and the Shahe Reservoir in the low-mountain hilly area of southeast-em China.Monthly sampling was conducted in the autumn(September-November)and winter(December-February)of 2022,and headspace equilibrium-gas chromatography and floating chamber-portable greenhouse gas analyzer methods were used to observe the dissolved CO2 concentrations in surface water and CO2 emission flux at the water-air interface,re-spectively.The results showed that CO2 concentrations and fluxes in the Pingqiao River-Shahe Reservoir continuum ranged from 0.034 to 0.415 mmol/L and-7.835 to 4.481 mmol/(m2·h),respectively.Spatially,CO2 concentrations and fluxes at the reservoir inlet were significantly higher than those in the Pingqiao River and the Shahe Reservoir(P＜0.05);seasonally,CO2 concentrations and fluxes were significantly higher in autumn than in winter(P＜0.05).The influencing factors of CO2 dynam-ics varied considerably in different regions of the Pingqiao River-Shahe Reservoir continuum:CO2 concentrations and fluxes in the Pingqiao River were mainly affected by DO and pH,in the reservoir inlet were mainly affected by DO,pH and NH4+-N,and in the Shahe Reservoir were mainly affected by water temperature,DO,pH,Chl-a,PO43--P,TP,DOC and DIC.This study demonstrated strong temporal and spatial heterogeneity of CO2 emissions and influencing factors in river,in-let and reservoir.Therefore,comprehensively considering the characteristics of CO2 dynamics in different water regions of the source-type river-reservoir continuum is conducive to improving the accuracy of regional carbon budget.

外文关键词：

drinking water sourcesgreenhouse gasesCO2spatial and temporal variationsimpact factors

作者：

陈曦、程俊翔、徐力刚、丁竹红

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作者单位：

南京工业大学环境科学与工程学院,江苏南京 211816

中国科学院南京地理与湖泊研究所,中国科学院流域地理学重点实验室,江苏南京 210008

江西省生态文明研究院,江西南昌 330036

中国科学院大学南京学院,江苏南京 211135

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关键词：

饮用水源地温室气体 CO2 时空变化影响因子

基金：

江苏省碳达峰碳中和科技创新专项江苏省自然资源发展专项长春市科技发展计划中国科学院南京地理与湖泊研究所科技创新规划项目中国科学院南京地理与湖泊研究所科技创新规划项目

项目编号：

BK20220042JSZRHYKJ20211023SH03NIGLAS2022TJ13NIGLAS2022GS09

出版年：

2024

DOI：

10.19672/j.cnki.1003-6504.2078.23.338

环境科学与技术

湖北省环境科学研究院

环境科学与技术

CSTPCD北大核心

影响因子：0.943

ISSN：1003-6504

年,卷(期)：2024.47(2)

参考文献量68