Carbon emission flux and storage in the degraded peatlands of the Zoige alpine area in the Qinghai–Tibetan Plateau

Abstract

AbstractThe Zoige alpine peatlands cover approximately 4,605 km2 of the Qinghai–Tibetan Plateau and are considered to constitute the largest plateau peatland on the Eurasian continent. However, the Zoige alpine peatlands are undergoing major degradation because of human activities and climate change, which would cause uncertainty in the budget of greenhouse gases (CH4 and CO2) and carbon (C) storage in global peatlands. This study simultaneously investigates the CH4 and CO2 emission fluxes and C storage at three typical sites with respect to the peatland degradation gradient: peatland, wet meadow and dry meadow. Results show that peatland degradation would increase the CO2 emission and decrease the CH4 emission. Moreover, the average C emission fluxes were 66.05, 165.78 and 326.56 mg C m−2 hr−1 for the peatland, wet meadow and dry meadow, respectively. The C storage of the vegetation does not considerably differ among the three sampling sites. However, when compared with the peatland (1,088.17 t C ha−1), the soil organic C storage decreases by 420 and 570 t C ha−1 in case of wet and dry meadows, respectively. Although the C storage in the degraded peatlands decreases considerably, it can still represent a large capacity of C sink. Therefore, the degraded peatlands in the Zoige alpine area must be protected and restored to mitigate regional climate change.