CH4 and N2O emission from a winter-time flooded paddy field in a hilly area of Southwest China

Abstract

Abstract: By the method of static opaque chamber/ modified gas chromatography,a one year field experiment was conducted to measure in situ the CH₄ and N₂O emission from a winter time flooded paddy field in a hilly area of Southwest China.Gas samples were taken simultaneously from rice involved and rice uninvolved plots.The results showed that during rice growth period,the CH₄ emission from the winter time flooded paddy field was higher than that from other paddy fields,but largely lower than many previous reports for the similar regions in Southwest China.The average flux of CH₄ emission from rice involved plots was 22.76±2.76 mg CH₄·m^-2 ·h^-1 during rice growth period,9.64±1.17 mg CH₄·m^-2 ·h^-1 per year,and 1.43±0.20 mg CH₄·m^-2 ·h^-1 during non rice growth season; while that from rice uninvolved plots was only 2.03±0.18 mg CH₄·m^-2 ·h^-1 per year,markedly lower than those from rice involved plots.During rice growth season,the mean emission rate of CH₄ and N₂O was 4.53±0.38 mg CH₄·m^-2 ·h^-1 and 32.01±5.02 μg N₂O·m^-2 ·h^-1 from rice uninvolved plots,but reached to 22.76±2.76 mg CH₄·m^-2 ·h^-1 and 73.04±5.03 μg N₂O·m^-2 ·h^-1 from rice involved plots,respectively.Rice involvement resulted in 302% increment of CH₄ and 128% increment of N₂O emission.There was a clear trade off between CH₄ and N₂O emission in paddy fields.Even with a span of 500 years,our calculation showed that in this winter time flooded paddy field,the GWP contributed by N₂O production was 7.9% of the CH₄ contribution,and thus,the greenhouse effect of N₂O production from this field was very small.

Key words: Winter-time flooded paddy field, CH₄ and N₂O, Emission rate

CLC Number:

S153
X511

JIANG Changsheng, WANG Yuesi, ZHENG Xunhua, LI Jing, HUANG Yao, HAN Guangxuan, ZHANG Zhongjie, ZHU Bo . CH₄ and N₂O emission from a winter-time flooded paddy field in a hilly area of Southwest China[J]. Chinese Journal of Applied Ecology, 2005, 16(3): 539-544.

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CH₄ and N₂O emission from a winter-time flooded paddy field in a hilly area of Southwest China

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