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中国科学院东北地理所在河流CO2排放通量研究中取得新进展（图）
河流 水体 循环
2024/6/19
河流在全球碳循环中起着至关重要的作用。作为连接着陆地和海洋的动态管道，河流水体的CO2排放及其源汇格局一直是国际研究的热点。如何快速而准确地评估大尺度范围河流水体CO2排放通量的时空变化是目前碳循环领域研究者们所面临得重大挑战。
为揭示岩溶湿地表层水体二氧化碳分压（pCO2）的时空分布规律及其扩散通量，以我国最大的岩溶湿地贵州威宁草海为研究对象，分别于2019年7月（丰水期）和12月（枯水期）通过网格布点法，系统采集草海表层湿地水体，测定水样理化指标和离子组成，利用PHREEQCI软件计算水体pCO2，并基于Cole提出的气体扩散模型估算水-气界面二氧化碳（CO2）的扩散通量.结果表明：草海湿地表层水体丰水期pCO2的变化...
粤东五华河流域的化学风化与CO2吸收
硅酸盐矿物 化学风化 侵蚀介质 五华河
2013/3/29
基于对粤东五华河干流和支流水体的物理、化学组成测试数据，应用质量平衡法和相关分析法探讨湿热山地丘陵地区岩石化学风化过程对大气CO2的吸收.结果表明：五华河水体的总溶解性固体含量（77.11mg/L）接近于世界河流的平均值（65mg/L）；离子组成以Ca2+、Na+和HCO3-为主，可溶性Si次之.五华河流域化学径流组成主要源自硅酸盐矿物化学风化过程的贡献，碳酸盐矿物的贡献较少；大气和土壤CO2是流...
水柱中 CO2分压（ pCO2）的时空分布在一定程度上可反映水中碳的环境地化特征．本研究在夏季分层期间对三峡水库澎溪河（小江）流域高阳回水区段进行了昼夜连续观测发现，恒定的温跃层中 pCO2随水深增加而显著增大，表层 0.5m 处 pCO2均值为 152±71μatm ，而在水深 10.0m 处 pCO2均值为 4568±1089μatm ，同水温、 pH 及 DO 存在明显的负相关关系，进一步分...
An efficient method for measuring CO2 concentration in gassy lakes: Application to Lakes Nyos and Monoun, Cameroon
Lake Nyos Lake Monoun in-situ analysis dissolved CO2 gas self-lifting
2017/8/9
A simple and efficient method for measuring CO2 concentration of deep water of gassy lakes is proposed. This method is based on the gas self-lifting in a plastic hose that is deployed into deep water ...
Parameterization of a coupled CO2 and H2O gas exchange model at the leaf scale of Populus euphratica
Parameterization coupled CO2 and H2O gas exchange model leaf scale Populus euphratica
2010/4/7
The following two models were combined to simultaneously predict CO2 and H2O gas exchange at the leaf scale of Populus euphratica: a Farquhar et al. type biochemical sub-model of photosynthesis (Farqu...
Seasonal and diurnal variations in moisture, heat and CO2 fluxes over a typical steppe prairie in Inner Mongolia, China
moisture CO2 fluxes heat
2009/7/22
In order to examine energy partitioning and CO2 exchange over a steppe prairie in Inner Mongolia, China, fluxes of moisture, heat and CO2 in the surface layer from June 2007 through June 2008 were cal...
Variability of dissolved CO2 in the Pang and Lambourn Chalk rivers
carbon dioxide surface waters Lambourn Chalk rivers
2009/5/6
This paper presents the results of a two-year field campaign to determine the spatial and temporal variability of groundwater interaction with surface waters in two Cretaceous Chalk catchments (the Pa...
CO2 and H2O Fluxes Ratio in Paddy Fields of Thailand and Japan
H2O Fluxes CO2 flux Paddy Fields
2009/4/13
Measurements of CO2 flux (FCO2) and H2O flux (FH2O) were carried out on paddy fields of Thailand and Japan during the 2004, 2005 and 2006 growing seasons using the Bowen ratio technique. The objective...
The sensitivity of stand-scale photosynthesis and transpiration to changes in atmospheric CO2 concentration and climate
atmospheric CO2 transpiration
2009/3/25
The 3-dimensional forest model MAESTRO was used to simulate daily and annual photosynthesis and transpiration fluxes of forest stands and the sensitivity of these fluxes to potential changes in atmosp...
Long-term and seasonal variations in CO2: linkages to catchment alkalinity generation
CO2 alkalinity acidification
2009/3/23
As atmospheric emissions of S have declined in the Northern Hemisphere, there has been an expectation of increased pH and alkalinity in streams believed to have been acidified by excess S and N.
关于全球CO2汇的位置、大小、变化和机制目前仍不确定, 还存有争议. 在理论计算和野外观测数据证明的基础上发现, 可能存在一种由全球水循环产生的重要的CO2汇(以溶解无机碳-DIC的形式). 这个汇达到0.8013 Pg C/a(约占人类活动排放CO2总量的10.1%, 或占所谓的遗漏CO2汇的28.6%), 它是由水对CO2的溶解吸收形成的, 并随着碳酸盐的溶解及水生植物光合作用对CO2的消耗的...
盐生荒漠地表水、热与CO2输送的实验研究
2007/8/24
利用安装在准噶尔盆地南缘多汁盐柴类荒漠上的涡度相关系统与配套的微气象观测系统所得数据，分析了显热、潜热与CO2通量的日过程和季节变化特点及各通量间的相互关系。数据显示了一个明显违背植物水分关系一般规律的现象：当水汽 (潜热) 通量明确显示土壤水分亏缺时，净光合 (CO2通量) 却未受到影响。因此推测当地原生植物的根系在积盐严重的土壤上层没有发育，所以其水分状况与光合能力不受...