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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 4 - HYDRO-ENVIRONMENT : The Stimulation of High Nutrients Input to CH4 Emission in the Reed-dominated Wetlands
The Stimulation of High Nutrients Input to CH4 Emission in the Reed-dominated Wetlands
Author : Liang Wang , Huaidong Zhou, Chang Liu, Dongsheng Cheng and Jiapeng Wu
Methane (CH ) fluxes were monthly measured in a reed-dominated eutrophic wetland with 4 static chamber method for one year. Results showed that there were significant spatial variations of CH 4 emissions with pollution gradients in Baiyangidan wetland. Firstly, the severely polluted place (Station R) had about 20.0 % higher CH emissions than the slighted polluted place (Q). From Station R to Station Q, 4 2 2 the average CH emission value decreased from 1.153.20 mg\(m h) to 0.962.97 mg\(m h) and the 4 highest soil TP value was found in Station R. Results indicated that increased nutrient contents would affect the decomposition rate of soil organic matter and the CH emission. In the longer term that would 4 change the distribution of the soil carbon content. Secondly, water area was the source of CH and land 4 area was the sink of CH . From water area to land area, the CH emission gradually decreased. The 4 4 downtrend of CH emissions was found in both stations. The highest value was found in water area R2 4 2 2 (14.00 mg\(m h)) and Q1 (10.73 mg\(m h)) and the lowest value was found in land area R4 (-3.87 2 2 mg\(m h)) and Q3 (-7.68 mg\(m h)). CH fluxes in the land\water ecotones also displayed a strong 4 temporal variation and the freeze?thaw period was the important time for methane emission. The result showed that high nutrients input will stimulate the emission of CH in the reed-dominated wetlands, and 4 the soil C content would be a limiting factor for CH emission in the Baiyangdian wetland. 4
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Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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