The Regulating Role of Meteorology in the Wetland-Air CO2 Fluxes at the Largest Shallow Grass-Type Lake on the North China Plain

Li, Gang1; Xiao, Kai1; Wang, Qianqian1; Zhang, Yan2; Li, Haitao3; Li, Hailong1

2023

10.3390/w15010139

WATER   Impact Factor & Quartile

2073-4441

Lakes are hot spots of carbon cycles in inland aquatic systems. As a vital factor, meteorology, including air temperature, precipitation, wind speed and evapotranspiration, is profoundly affecting or even regulating the wetland-air CO2 exchanges. Compared with some other similar lakes in China, the largest shallow grass-type Baiyangdian Lake (BYDL) acts as a vital CO2 sink on the North China Plain. The purpose of this study is to reveal the effects of meteorology on the process of CO2 flux variation. Based on the method of the eddy covariance, the daily average wetland-air CO2 flux at the BYDL over the monitoring period from April 2019 to November 2020, reached -0.63 mu mol m(-2) s(-1), and the annual average reached -0.71 mu mol m(-2) s(-1) from 12 April 2019 to 12 April 2020. The CO2 sink fluxes varied with the seasons and reached the maximum in summer. Temperature and evapotranspiration are two major driving factors, whose higher values can positively improve the wetland CO2 sinks. Precipitation generally coincides with the CO2 sinks, but the relatively larger summertime precipitation (0.39 m in 2020, compared with that of 0.17 m in 2019) inhibits the CO2 uptakes on longer timescales. A moderate wind speed in the range of 1.6 similar to 3.3 m s(-1), promoted the CO2 sinks for the shallow grass-type lake. Compared with previous studies at the same or similar wetlands, consistent CO2 sink fluxes are found. Further in this study, the variation trends of CO2 sinks with the changing meteorological factors are revealed for the first time in this type of wetland. Once meteorology is determined under both the anthropogenic and climatic impacts, the evaluation and prediction of the lacustrine carbon cycling could be more precise. Generally, this study will serve as an important data point into the global understanding of lake carbon fluxes.

wetland-air interface CO2 flux meteorology eddy covariance temperature evapotranspiration carbon sink shallow lake reeds

SCI

English

First ; Corresponding

Environmental Sciences & Ecology ; Water Resources

Environmental Sciences ; Water Resources

WOS:000908734300001

MDPI

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, State Environm Protect Key Lab Integrated Surface, Shenzhen 518055, Peoples R China
2.China Univ Geosci Beijing, Sch Water Resources & Environm, MOE Key Lab Groundwater Circulat & Environm Evolut, Beijing 100083, Peoples R China
3.China Inst Geoenvironm Monitoring, Beijing 100081, Peoples R China

Li, Gang,Xiao, Kai,Wang, Qianqian,et al. The Regulating Role of Meteorology in the Wetland-Air CO2 Fluxes at the Largest Shallow Grass-Type Lake on the North China Plain[J]. WATER,2023,15(1).

Li, Gang,Xiao, Kai,Wang, Qianqian,Zhang, Yan,Li, Haitao,&Li, Hailong.(2023).The Regulating Role of Meteorology in the Wetland-Air CO2 Fluxes at the Largest Shallow Grass-Type Lake on the North China Plain.WATER,15(1).

Li, Gang,et al."The Regulating Role of Meteorology in the Wetland-Air CO2 Fluxes at the Largest Shallow Grass-Type Lake on the North China Plain".WATER 15.1(2023).