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首页> 外文期刊>Soil Biology & Biochemistry >Diurnal, seasonal, and inter-annual variations of N sub(2)O fluxes from native semi-arid grassland soils of inner Mongolia
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Diurnal, seasonal, and inter-annual variations of N sub(2)O fluxes from native semi-arid grassland soils of inner Mongolia

机译：内蒙古天然半干旱草原土壤N sub（2）O通量的日，季节和年际变化

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摘要

In order to investigate the diurnal, seasonal, and inter-annual variations of nitrous oxide (N sub(2)O) flux and associated microbiological mechanisms, in situ measurements of N sub(2)O Flux from unfertilized, ungrazed, and unirrigated semi-arid grassland soils in Inner Mongolia, northeast China were undertaken using a closed chamber technique from 1995 to 2003. In addition, laboratory experiments were carried out using the acetylene inhibition method (AIM) in 1998 and 2001. The results showed no significant linear relationship between soil moisture and diurnal N sub(2)O flux, or between N sub(2)O flux and temperature (i.e., temperature at 0-15 cm depth, temperature of surface soil, and temperature of inner chamber air). However, the results showed a significant influence of growing season on diurnal variations of N sub(2)O flux. N sub(2)O efflux was usually high in spring or summer, and low in winter. The mean total annual N sub(2)O fluxes was 0.73+/-0.52 kg N sub(2)O-N ha super(-1) yr super(-1), with a coefficient of variation of annual N sub(2)O flux of 71.6%. Based on our estimates from 5 yr of data, the total N sub(2)O emission from all of the temperate grassland soils of China was approximately 0.21 Tg N sub(2)O-N yr super(-1), which was about 21% of the total global flux from temperate grassland soils. It was the distribution of effective rainfall, rather than precipitation intensity, that influenced seasonal and inter-annual variations of N sub(2)O flux. Our laboratory incubation study revealed that heterotrophic nitrification was the principal source of N sub(2)O in the studied soils.
机译：为了研究一氧化二氮（N sub（2）O）通量的日变化，季节变化和年际变化以及相关的微生物机制，对未受精，未湿润和未灌溉半水中N sub（2）O通量的原位测量1995年至2003年在中国东北的内蒙古干旱草地土壤上进行了试验。此外，在1998年和2001年使用乙炔抑制法（AIM）进行了室内试验。结果表明，线性关系不显着介于土壤湿度和昼夜Nsub（2）O通量之间，或介于Nsub（2）O通量与温度之间（即0-15厘米深度处的温度，表层土壤的温度和室内空气的温度）。但是，结果表明生长期对N sub（2）O通量的日变化有重大影响。 N sub（2）O外排通常在春季或夏季高，而在冬季低。平均每年N sub（2）O的总通量为0.73 +/- 0.52 kg N sub（2）ON ha super（-1）yr super（-1），具有每年N sub（2）O的变异系数通量为71.6％。根据我们对5年数据的估计，中国所有温带草原土壤的Nsub（2）O排放总量约为0.21 Tg Nsub（2）ON yr super（-1），约为21％温带草原土壤的全球总通量的变化。影响N sub（2）O通量的季节和年际变化的是有效降雨的分配，而不是降水强度。我们的实验室孵化研究表明，异养硝化作用是研究土壤中N sub（2）O的主要来源。

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