RESEARCH PAPER
Investigating the relationship between temperature and soil CO2 emission according to paddy water condition
1
National Institute of Crop Sciences, Rural Development Administration, Wanju 55365, Republic of Korea
2
Department of Applied Plant Science, Chonnam National University, Gwangju 61186, Republic of Korea
3
BK21 FOUR Center for IT-Bio Convergence System Agriculture, Chonnam National University, Gwangju 61186, Republic of Korea
4
Food Crop Research Center, Jeollanamdo Agricultural Research and Extension Services, Naju 58213, Republic of Korea
5
Satellite Application Division, Korea Aerospace Research Institute, Daejeon 34133, Republic of Korea
6
Department of Earth and Environmental Sciences, Jeonbuk National University, Jeonju 54896, Republic of Korea
Final revision date: 2024-01-27
Acceptance date: 2024-02-27
Publication date: 2024-04-11
Corresponding author
Int. Agrophys. 2024, 38(2): 187-194
HIGHLIGHTS
- The soil CO2 emission in both fallow and drained paddies had an exponential correlation with temperature. However, the drained paddies are more sensitive to temperature than fallow period. The soil CO2 emissions during flooded periods was suppressed, but the water on the paddy soil surface after draining or rainfall event can suppress the CO2 emission, irrespective of the depth of water.
KEYWORDS
TOPICS
ABSTRACT
The soil CO2 emissions from rice paddy fields have a significant influence on net CO2 fluxes throughout the year. Unlike other agroecosystems, rice paddy fields are flooded for most of the growing season. Over the course of this study, soil CO2 emissions in rice paddy fields were observed under fallow, flooded, and drainage conditions using a closed-system portable chamber. It was found that the dried and bare soil in fallow paddy systems emit a significant amount of CO2. On the other hand, the CO2 released from the soil during flooding periods was suppressed by the water layer. In drainage conditions, the exponential curve of the relationship between soil CO2 emissions and soil temperature was particularly evident. These results suggest that soil CO2 emissions during fallow and drainage periods can exceed the level of CO2 emissions that is suppressed under flooded conditions. However, immediately after draining or the occurrence of a rainfall event, the suppression of soil CO2 emission by residual paddy water will provide valuable insights in the interpretation of agricultural carbon cycle models.
FUNDING
This work was supported by Korea Environment Industry and Technology Institute (KEITI) through Project for developing an observation-based GHG emissions geospatial information map, funded by Korea Ministry of Environment (MOE) (Project No. RS-2023-00232066, 2023-2027).
CONFLICT OF INTEREST
The authors declare no conflict of interest.
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