Abstract
The peat bogs on the Tibetan Plateau are an important source of carbon dioxide (CO<sub>2</sub>) and methane (CH<sub>4</sub>) in Chinese atmosphere. In order to study the effects of different micro-topography of peat bogs on CO<sub>2</sub> and CH<sub>4</sub> emission fluxes, the static box-meteorological chromatography method was used to determine the CO<sub>2</sub> and CH<sub>4</sub> emission fluxes of hummocky and hollow in the peat bogs in Arak Lake Basin from May to September in 2020. Our results showed that the peaks of CO<sub>2</sub> and CH<sub>4</sub> emission fluxes from hummocky and hollow all appeared in July, and the lowest values all appeared in May. The maximum CO<sub>2</sub> emission fluxes of hummocky and hollow are 440.44 mg•m<sup>-2</sup>•h<sup>-1</sup> and 198.20 mg•m<sup>-2</sup>•h<sup>-1</sup>, respectively, and the maximum CH<sub>4</sub> emission fluxes are 2.62 mg•m<sup>-2</sup>•h<sup>-1</sup> and 3.21 mg•m<sup>-2</sup>•h<sup>-1</sup>, respectively. The average CO<sub>2</sub> emission flux during the growing season of hummocky (368.79±54.70 mg•m<sup>-2</sup>•h<sup>-1</sup>) was significantly higher than that of hollow (165.96±20.19 mg•m<sup>-2</sup>•h<sup>-1</sup>) (n=5, p=0.001), while the average CH<sub>4</sub> emission flux of hummocky (1.78±0.27 mg•m<sup>-2</sup>•h<sup>-1</sup>) is significantly lower than that of hollow (2.24±0.27 mg•m<sup>-2</sup>•h<sup>-1</sup>) (n=5, p=0.007). The CO<sub>2</sub> emission flux of hummocky and hollow during the growing season is mainly affected by the 5 cm soil temperature, and the CH<sub>4</sub> emission flux is mainly affected by the 5~20 cm soil temperature.
Highlights
The carbon storage of peat bogs is 1/3 of the global soil carbon storage, which is equivalent to 75% of the carbon storage in the atmosphere, and it is an important carbon sink [1]
The results showed that the Q10 of the emission of CO2 and CH4 from hollow was greater than that of the hummocky, and the Q10 of the CH4 emission flux of the hummocky and hollow was greater than the Q10 of CO2 emission flux
During the growing season in 2020, the average CO2 emission flux from peat bogs in the Arak Lake Basin was 368.79±54.70 mg·m-2·h-1, which was significantly higher than the average CO2 emission flux of depressions (165.96±20.19 mg·m-2·h-1) (n=5, p=0.001), the peaks of CO2 emission fluxes in hummocky and hollow all appeared in July, and the lowest values all appeared in May
Summary
The carbon storage of peat bogs is 1/3 of the global soil carbon storage, which is equivalent to 75% of the carbon storage in the atmosphere, and it is an important carbon sink [1]. Along with the respiration of peat bog animals, plants and microorganisms and the anaerobic biochemical reaction caused by the hypoxic environment, the peat bog will release a large amount of carbon dioxide (CO2) and methane (CH4), which is an important carbon source for the atmosphere [2]. CO2 and CH4 are the main greenhouse gases. The increase in temperature causes the permafrost to degrade, and the exchange flux of greenhouse gases with the atmosphere of the peat bogs, which is associated with permafrost [5], will inevitably change
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