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首页> 外文期刊>土壤圈（英文版） >Nitrous Oxide and Methane Emissions as Affected by Water, Soil and Nitrogen
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Nitrous Oxide and Methane Emissions as Affected by Water, Soil and Nitrogen

机译：水，土壤和氮对一氧化二氮和甲烷排放的影响

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Specific management of water regimes,soil and N in China might play an important role in regulating N2O and CH4 emissions in rice fields.Nitrous oxide and methane emissions from alternate non-flooded/flooded paddies were monitored simultaneously during a 516-day incubation with lysimeter experiments.Two N sources (15N-(NH4)2SO4 and 15N-labeled milk vetch)were applied to two contrasting paddies:one derived from Xiashu loess(Loess)and one from Quaternary red clay(Clay).Both N2O and CH4 emissions were significantly higher in soil Clay than in soil Loess during the flooded period.For both soil,N2O emissions peaked at the transition periods shortly after the beginning of the flooded and non-flooded seasons.Soil type affected N2O emission patterns.In soil Clay,the emission peak during the transition period from non-flooded to flooded conditions was much higher than the peak during the transition period from flooded to non-flooded conditions.In soil Loess,the emission peak during the transition period from flooded to non-flooded conditions was obviously higher than the peak during the transition period from non-flooded to flooded conditions except for milk vetch treatment.Soil type also had a significant effect on CH4 emissions during the flooded season,over which the weighted average flux was 111 mg C m-2 h-1 and 2.2 mg C m-2 h-1 from Clay and Loess,respectively.Results indicated that it was the transition in the water regime that dominated N2O emissions while it was the soil type that dominated CH4 emissions during the flooded season.Anaerobic oxidation of methane possibly existed in soil Loess during the flooded season.
机译：中国水情，土壤和氮素的特殊管理可能在调节稻田中N2O和CH4的排放中起着重要作用。在516天的溶菌仪孵育过程中，同时监测了非水淹/水淹稻田中的一氧化二氮和甲烷排放将两种氮源（15N-（NH4）2SO4和15N标记的紫v菜）分别施用于两种对比稻田：一种来自下蜀黄土（Loess），一种来自第四纪红黏土（Clay）.N2O和CH4的排放量分别为在淹水期，土壤黏土的含量显着高于黄土。在淹水季节和非淹水季节开始后不久的过渡期，土壤中的N2O排放均达到峰值。土壤类型影响N2O的排放方式。从非淹水到淹水过渡期的排放峰值远高于从淹水到非淹水过渡期的排放峰值。从淹没到淹没状态的过渡期明显高于从淹没到淹没状态过渡时期的峰值，除了紫etch菜处理。土壤类型对淹水季节的CH4排放也有显着影响。粘土和黄土的加权平均通量分别为111 mg C m-2 h-1和2.2 mg C m-2 h-1。结果表明，土壤中N2O排放占主导的是水态过渡黄土在淹水季节土壤中可能存在甲烷的厌氧氧化。

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