Soil greenhouse gases fluxes and the affecting factors of natural secondary forest from seriou-sly burned area in Greater Khingan Mountains, China

doi:10.13287/j.1001-9332.201903.018

Abstract

Abstract: To learn the intensity of greenhouse gases (GHG) fluxes source/sink from soil and the influence factors of a natural secondary forest from seriously burned area in Greater Khingan Mountains, we used static chamber-GC technique to measure soil GHG (CO₂, N₂O, CH₄) in situ during the growing season (from June to September). The results showed that: 1) The soil of natural secondary forest was atmospheric CO₂ and N₂O source and CH₄sink. The mean fluxes of soil GHG (CO₂, N₂O, CH₄) during the growing season were 575.81 mg·m^-2·h^-1, 17.81 μg·m^-2·h^-1 and -68.69 μg·m^-2·h^-1, respectively. The CO₂ and CH₄ fluxes showed an obvious double-peak trend and the change of N₂O fluxes was a single-peak pattern during the growing season, with all maximum fluxes occurred in August. 2) Soil temperature was the predominant factor controlling the soil GHG fluxes. The correlation of soil/atmospheric humidity and soil GHG fluxes was complicated and differed between diurnal scale and seasonal scale. 3) The soil GHG fluxes measured at 9:00-12:00 am could represent the diurnal average fluxes on the same day after proper correction in this area. The findings supplemented the soil GHG fluxes data of fired forest ecosystem in Greater Khingan Mountains, which could provide a basis for related research of soil GHG source/sink in this area.

Key words: soil, greenhouse gases, burned area, Greater Khingan Mountains, natural secondary forest

LIANG Dong-zhe, ZHAO Yu-sen, XIN Ying. Soil greenhouse gases fluxes and the affecting factors of natural secondary forest from seriou-sly burned area in Greater Khingan Mountains, China[J]. Chinese Journal of Applied Ecology, 2019, 30(3): 777-784.

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