Journal of Food, Agriculture and Environment

Effects of plants on N₂O emission in freshwater marsh ecosystem

Author(s):

Yan Lu ^1-3*, Hong-wen Xu ¹, Chang-chun Song ²

Recieved Date: 2011-11-18, Accepted Date: 2012-01-03

Abstract:

N₂O fluxes in field of Calamagrostis angustifoli meadow and Carex lasiocarpa marsh were measured using the technique of closed opaque chamber and gas chromatography system during 2003~2005 growing seasons. The experiment was carried out at the Sanjiang Mire Wetland Experimental Station in Northeast China. The results showed that wetland was weak N₂O emission sources in growing seasons. The influence of wetland plants on N₂O emission of wetland ecosystem was not the same in different growing stages. N₂O emission flux reached peak value at heading, flowering and fructicative stage from Calamagrostis angustifoli meadow. And this was related to rise in temperature and vigorous metabolism. N₂O emission flux reached maximum at seedling stages from Carex lasiocarpa marsh. Frozen soil freezing and thawing was the main reason. With the plants participation, the N₂O emissions ability was enhanced greatly. N₂O fluxes from soil-plant system were 1.6, 2.11, 2.33 times as high as that from soil in Calamagrostis angustifoli meadow during three growing seasons, while 1.81, 1.5, 1.36 times in Carex lasiocarpa marsh. The N₂O fluxes of Calamagrostis angustifoli meadow was higher than that of Carex lasiocarpa marsh during three growing seasons. The differences of soil physical and chemical characteristics and hydrology situations between the two wetlands could explain this phenomenon.

Keywords:

N₂O fluxes, Calamagrostis angustifoli meadow, Carex lasiocarpa marsh, wetland plants, the Sanjiang plain

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 1
Category: Environment
Pages: 662-666

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