Annual Cycle of Heat and CO2 Fluxes Over an Artificial Rice Wetland in the Liaohe Delta of China

DOI

10.2991/edep-18.2018.50How to use a DOI?

Keywords

CO2 flux, sensible heat flux, latent heat flux, rice wetland, Liaohe Delta

Abstract

Seasonal variations in sensible heat flux (Hs), latent heat flux (LE), and carbon dioxide flux (Fc) during 2005 over an artificial rice wetland in the Liaohe Delta, Northeast China, were investigated using the eddy covariance (EC) technique. The results show that Hs is relatively larger (>200 W m–2) in spring, whereas LE is relatively larger in summer and autumn (>500 W m–2). Fc depends strongly on the status of the crops and mostly reaches about –2.0 mg CO2 m–2 s–1 at daytime from June to September but varies around zero in the other months. CO2 concentration is in the range of 300–500 ppm and varies similarly with Fc from June to September. The largest negative Fc values usually occur at mid-day, with values of –0.6 mg CO2 m–2 s–1 during the early growth stage (5–8 June), –1.8 mg CO2 m–2 s–1 during the middle growth stage (17–20 July), and approximately –0.2 to 0.3 mg CO2 m–2 s–1 during the late growth stage (19–22 September). The cumulative CO2 flux during 2005 was estimated to be –1570 g CO2 m–2 year–1, which suggests that the rice wetland in Panjin acts as a large CO2 sink.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Xiao-Lan LI
AU  - Qing-Yu JIA
AU  - Jing-Miao LIU
AU  - Rong-Ping LI
AU  - Yan-Bing XIE
AU  - Guo-Fei LIU
PY  - 2018/10
DA  - 2018/10
TI  - Annual Cycle of Heat and CO2 Fluxes Over an Artificial Rice Wetland in the Liaohe Delta of China
BT  - Proceedings of the 2018 International Conference on Energy Development and Environmental Protection (EDEP 2018)
PB  - Atlantis Press
SP  - 316
EP  - 326
SN  - 2352-5401
UR  - https://doi.org/10.2991/edep-18.2018.50
DO  - 10.2991/edep-18.2018.50
ID  - LI2018/10
ER  -