CO2 and CH4 flux across water-air interface in summer in the downstream of Jinsha River, Southwest China

被引：2

作者：

Qin Y. ^{[1
]}

Yang B. ^{[1
]}

Li Z. ^{[2
]}

He B. ^{[3
]}

Du H. ^{[2
]}

机构：

[1] Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing

[2] CAS Key Lab of Reservoir Environment, Chongqing Institute of Green and Intelligence Technology, Chinese Academy of Sciences, Chongqing

[3] College of Urban Construction and Environmental Engineering, Chongqing University, Chongqing

来源：

Li, Zhe (lizhe@cigit.ac.cn) | 1600年 / Science Press卷 / 29期

关键词：

CH[!sub]4[!/sub; CO[!sub]2[!/sub; Environmental factors; Headspace equilibrium method; Jinsha River; Thin boundary layer method; Water-air flux;

D O I：

10.18307/2017.0423

中图分类号：

学科分类号：

摘要：

Rivers connect continent and ocean, the two major carbon pools, which play an important role in global carbon cycling. Jinsha River is the upstream of Yangtze River and significantly influences carbon cycle and chemical weathering in the watershed. Water-air CO2 and CH4 fluxes were measured from August 8 to 18, 2015 in the downstream of Jinsha River. The study used the headspace equilibrium method and thin boundary layer method to estimate p(CO2) and p(CH4) in surface water and exchange fluxes between water and air. Results showed that in summer p(CO2) and CO2 fluxes were 2724.84±477.18 μatm and 2.24±0.50 mmol/(m2·h), respectively, the p(CH4) and CH4 fluxes were 59.96±6.74 μatm and 0.000163±0.00009 mmol/(m2·h), and the trend of differential pressure was consistent with flux. p(CO2) has significant positive correlation with dissolved inorganic carbon and total alkalinity. p(CH4) has significant positive correlation with water temperature and chlorophyll-a. Air-water CO2 fluxes was mainly impacted by p(CO2), dissolved inorganic carbon and total alkalinity. CH4 fluxes was significantly impacted by p(CH4) and wind speed. Impacts from other environmental factors such as nutrients were not obvious, and more studies shall be conducted to elucidate the variance of flux and its controlling factors. The air-water CH4 fluxes of Jinsha River was low, and the air-water CO2 fluxes was in medium level, comparing to other major rivers in the world. © 2017 by Journal of Lake Sciences.

引用

页码：991 / 999

页数：8

共 36 条

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