Assessing seasonal variation of diffusive nitrous oxide emission from freshwater wetland in Keibul Lamjao National Park, Manipur Northeast India

Atmospheric Environment: X

Suraj S. Chingangbam¹  R.S. Khoiyangbam² 

[1]Department of Forestry and Environmental Science, Manipur University, Canchipur, Imphal, 795003, India

[2]Corresponding author.

关键词: Greenhouse gas;    Freshwater wetland;    Nitrification;    Nitrous oxide;    Seasonal;   

DOI  :  

来源: DOAJ

【 摘 要 】

Nitrous oxide (N2O) is an important atmospheric trace gas that contributes to the present global warning and is responsible for the destruction of stratospheric ozone. The emission of N2O from the natural freshwater wetland to the atmosphere is poorly understood. We investigated N2O flux using the static chamber method and their controlling factor in the freshwater wetland of Keibul Lamjao National Park (KLNP), Manipur. The overall mean N2O flux from the park was 0.10 ± 0.04 μg m−2 d−1. Nitrous oxide emission showed evident seasonal changes, the highest flux occurring in the summer (with a mean value of 0.14 ± 0.02 μg m−2 d−1), while the lowest flux appeared in the winter (0.05 ± 0.01 μg m−2 d−1). There were significant seasonal variations of N2O emission. The NH4+ – N and NO3− – N have a significantly positive correlation with N2O flux (p < 0.001). By comparing the slopes of the regression equations obtained between the emission of nitrous oxide and the content of NO3− – N and NH4+ – N in water, we found that N2O flux were predominantly by NH4+ – N. The results imply that nitrification played a crucial role in N2O emissions from the wetland park. Additionally, the decay of submerged macrophytes in the lake contributes to N2O flux, particularly during the summer.

【 授权许可】

Unknown