Greenhouse gases emissions from riparian wetlands: an example from the Inner Mongolia grassland region in China.

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Date: Sept. 1, 2021
From: Biogeosciences(Vol. 18, Issue 17)
Publisher: Copernicus GmbH
Document Type: Brief article
Length: 335 words

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Abstract :

Gradual riparian wetland drying is increasingly sensitive to global warming and contributes to climate change. Riparian wetlands play a significant role in regulating carbon and nitrogen cycles. In this study, we analyzed the emissions of carbon dioxide (CO.sub.2 ), methane (CH.sub.4 ), and nitrous oxide (N.sub.2 O) from riparian wetlands in the Xilin River basin to understand the role of these ecosystems in greenhouse gas (GHG) emissions. Moreover, the impact of the catchment hydrology and soil property variations on GHG emissions over time and space was evaluated. Our results demonstrate that riparian wetlands emit larger amounts of CO.sub.2 (335-2790 mgm-2h-1 in the wet season and 72-387 mgm-2h-1 in the dry season) than CH.sub.4 and N.sub.2 O to the atmosphere due to high plant and soil respiration. The results also reveal clear seasonal variations and spatial patterns along the transects in the longitudinal direction. N.sub.2 O emissions showed a spatiotemporal pattern similar to that of CO.sub.2 emissions. Near-stream sites were the only sources of CH.sub.4 emissions, while the other sites served as sinks for these emissions. Soil moisture content and soil temperature were the essential factors controlling GHG emissions, and abundant aboveground biomass promoted the CO.sub.2, CH.sub.4, and N.sub.2 O emissions. Moreover, compared to different types of grasslands, riparian wetlands were the potential hotspots of GHG emissions in the Inner Mongolian region. Degradation of downstream wetlands has reduced the soil carbon pool by approximately 60 %, decreased CO.sub.2 emissions by approximately 35 %, and converted the wetland from a CH.sub.4 and N.sub.2 O source to a sink. Our study showed that anthropogenic activities have extensively changed the hydrological characteristics of the riparian wetlands and might accelerate carbon loss, which could further affect GHG emissions.

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Gale Document Number: GALE|A673948848