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07:26
Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands
Published on: January 31, 2025
748
Tropical forest soils serve as substantial and persistent methane sinks.
Jun-Fu Zhao1, Shu-Shi Peng2, Meng-Ping Chen1
1School of Ecology and Environment, Hainan University, Haikou, 570228, China.
Scientific Reports
|November 16, 2019
Summary
Tropical forest soils are significant methane sinks, absorbing methane at an average of 2.00 kg CH4-C ha-1 yr-1. Soil moisture strongly controls this methane uptake, particularly during the dry season.
Area of Science:
- Environmental Science
- Soil Science
- Ecology
Background:
- Tropical forest soils play a crucial role in global methane (CH4) cycling.
- However, data on soil methane fluxes in tropical regions, especially Southeast Asia, are limited, creating uncertainty in global methane budget estimations.
Purpose of the Study:
- To quantify soil methane fluxes in a lowland tropical forest in Hainan, China.
- To identify the key environmental factors driving seasonal variations in methane uptake.
Main Methods:
- Conducted continuous two-year measurements of soil methane fluxes from September 2016 to September 2018.
- Analyzed the influence of soil moisture and temperature on methane flux rates.
Main Results:
- The tropical forest soil acted as a significant methane sink, with an average annual uptake of 2.00 kg CH4-C ha-1 yr-1.
- Methane uptake was substantially higher during the dry season (-1.00 nmol m-2 s-1) compared to the wet season (-0.24 nmol m-2 s-1).
- Soil moisture was the primary driver, explaining 94% of the seasonal variation in methane fluxes; soil temperature had a negligible additional effect.
Conclusions:
- Tropical forest soils in this region are confirmed methane sinks.
- Understanding the strong control of soil moisture is vital for accurately modeling regional and global methane budgets.
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