title: Nitrous oxide emissions from Phragmites australis-dominated zones in a shallow lake.
abstract: Nitrous oxide (N(2)O) emissions from Phragmites australis (reed)--dominated zones in Baiyangdian Lake, the largest shallow lake of Northern China, were investigated under different hydrological conditions with mesocosm experiments during the growing season of reeds. The daily and monthly N(2)O emissions were positively correlated with air temperature and the variation of aboveground biomass of reeds (p < 0.05), respectively. The N(2)O emissions from reeds were about 45.8-52.8% of that from the sediments. In terms of the effect of hydrological conditions, N(2)O emissions from the aquatic-terrestrial ecotone were 9.4-26.1% higher than the submerged zone, inferring that the variation of water level would increase N(2)O emissions. The annual N(2)O emission from Baiyangdian Lake was estimated to be about 114.2 t. This study suggested that N(2)O emissions from shallow lakes might be accelerated by the climate change as it has increased air temperature and changed precipitation, causing the variation of water level.
authors.affiliation: State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China. zfyang@bnu.edu.cn
authors.forename: Zhifeng
authors.initials: Z
authors.lastname: Yang
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhao
authors.forename: Xinghui
authors.initials: X
authors.lastname: Xia
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000378:metabolism; D000397:Air Pollution / Q000706:statistics & numerical data; D057231:Climate Change; D004784:Environmental Monitoring; D060106:Lakes / Q000737:chemistry; D009609:Nitrous Oxide / Q000032:analysis* / Q000378:metabolism; D006109:Poaceae / Q000378:metabolism*; D012621:Seasons; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000378:metabolism
chemical_list: D000393:Air Pollutants; D014874:Water Pollutants, Chemical; D009609:Nitrous Oxide