Nitrous oxide and methane emissions from different agricultural fields during freezing and thawing periods in the lower reaches of Liaohe Plain

Abstract

Abstract: Flux of nitrous oxide and methane were measured in the lower reaches of Liaohe Plain by using static chamber-gas chromatographic techniques in thawing period.The plots included maize,soybean and paddy fields.The results showed that the flux of nitrous oxide in the three plots were high in the period indicating important N₂O-releasing sources.The flux of methane in these plots was quite low in the period which inducated that the fields are important CH₄-absorbing sinks.In thawing periods,temperature has no significant relationship with flux of nitrous oxide in the three plots.It is maybe a special phenomenon in contrast to that in the growing period.

Key words: Grapery, Management level, Arthropod community, Insect pest, Natural enemies of insect

CLC Number:

ZHENG Jing, WANG Chongyang, WANG Yinghong, LU Caiyan, SHI Yi, CHEN Xin. Nitrous oxide and methane emissions from different agricultural fields during freezing and thawing periods in the lower reaches of Liaohe Plain[J]. cje, 2005, (9): 999-1003.

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