Nitrous oxide emission from a flooded tropical wetland across a vegetation and land use gradient

Autor: David Were, Thomas Hein, Frank Kansiime
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Journal of Water and Climate Change, Vol 14, Iss 2, Pp 387-400 (2023)
Druh dokumentu: article
ISSN: 2040-2244
2408-9354
DOI: 10.2166/wcc.2023.274
Popis: This study investigated, using the closed chamber method, the impact of (1) vegetation community type (Typha latifolia, Cyperus papyrus and Phragmites mauritianus) in a natural tropical freshwater marsh wetland (marsh) and (2) conversion of a natural tropical freshwater marsh into a rice paddy wetland (rice paddy), on nitrous oxide (N2O) emission. Both the marsh and the rice paddy were continuously flooded, while the rice paddy was unfertilized. Average N2O emission from the marsh did not vary significantly (p > 0.05) among the vegetation communities, ranging from 0.5 to 0.6 μg m−2 h−1. Similarly, these N2O emission rates were not significantly different (p > 0.05) from those recorded in the rice paddy (0.7 ± 2.8 [SE] μg m−2 h−1). There was no significant correlation (p > 0.05) between environmental parameters and N2O emission. We concluded that vegetation community type does not affect N2O emission from natural tropical freshwater marshes under continuous flooding. Further, converting natural tropical freshwater marshes into continuously flooded and unfertilized rice paddies does not affect N2O emission but instead enhances carbon emission, as was depicted by the significantly lower (p > 0.05) soil organic carbon content in the rice paddy. In view of climate change mitigation, therefore, wetland management should give priority to the conservation/protection of natural wetlands. HIGHLIGHTS Vegetation community type does not affect N2O emission from continuously flooded natural tropical wetlands.; Continuously flooded and unfertilized rice paddies are not N2O emission hotspots but are significant carbon sources.; N2O emission from continuously flooded tropical wetlands is not affected by seasonal changes.; Conserving natural wetlands, rather than converting them into rice paddies, enhances climate change mitigation.;
Databáze: Directory of Open Access Journals
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