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首页> 外文期刊>農業気象 >Nitrous oxide emissions from an Andosol upland field cropped to wheat and soybean with different tillage systems and organic matter applications
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Nitrous oxide emissions from an Andosol upland field cropped to wheat and soybean with different tillage systems and organic matter applications

机译：不同耕作制度和有机物质应用对小麦和大豆种植的安多索尔旱地的一氧化二氮排放量

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摘要

To elucidate effects of tillage systems and organic-matter applications on N2O emissions, we assessed seasonal patterns and magnitudes of N2O emissions from Andosol upland soil growing wheat and soybeans using different tillage systems (conventional tillage and no-tillage) and organic-matter applications (crop-residue, crop-residue and cattle manure, and none). Mean N2O emissions during June 2008-October 2010 were 41-134 mgN m(-2) yr(-1). The N2O emissions were observed immediately after manure application, fertilizer application, and during the later growing season in soybean-cropped soil. ANOVA revealed that the kind of crop and the organic-matter applications affect N2O emissions, unlike tillage systems. Greater N2O emissions in soil with residues and manure suggest that NO3--N determines N2O production by denitrification. Additionally, N2O emissions are greater in soybean-cropped soil, probably because of denitrification. The presence of fresh organic matter such as shed roots and degraded root nodules, NO3--N, or NO2--N under wet soil conditions is necessary for N2O production by denitrification. The water-filled pore space (WFPS) in no-tilled soil is consistently greater than that in conventionally tilled soil, but it does not affect N2O emissions, suggesting that soil wetness changes arc the cause: tillage is not the sole limiting factor for N2O production in well-aerated soil. Greater N2O emissions during warm, wet periods of the growing season imply that emissions are related to climatic conditions that affect the soil environment and the resultant microbial activity. Nevertheless, N2O emissions from the study site with light-colored Andosol resembled those from Andosol, but were less than those from the other soil types such as those of Brown Forest soil, Brown Lowland soil, Grey Lowland soil, Wet Andosol, and Peat soil. Light-colored Andosol of this study site has lower background emissions.
机译：为了阐明耕作制度和有机物施用对N2O排放的影响，我们使用不同的耕作制度（常规耕作和免耕）和有机物施用评估了Andosol旱地土壤生长的小麦和大豆的N2O排放的季节性模式和量值（作物残渣，作物残渣和牛粪肥，无）。 2008年6月至2010年10月的平均N2O排放量为41-134 mgN m（-2）yr（-1）。在施肥，施肥之后以及在大豆种植的土壤中，在生长季的后期都立即观察到N2O排放。方差分析表明，与耕作系统不同，农作物的种类和有机物的使用会影响一氧化二氮的排放。带有残留物和肥料的土壤中N2O排放量较大，表明NO3--N通过反硝化作用决定N2O的产生。此外，可能是由于反硝化作用，大豆作物土壤中的N2O排放量更大。对于通过反硝化生产N2O而言，在潮湿的土壤条件下必须存在新鲜的有机物质，例如生根和退化的根瘤，NO3--N或NO2--N。免耕土壤中的充水孔隙空间（WFPS）始终大于常规耕种土壤，但它不会影响N2O排放，这表明土壤湿度的变化是原因：耕作不是N2O的唯一限制因素在通风良好的土壤中生产。在生长季节的温暖湿润时期，N2O排放量增加，这意味着排放量与影响土壤环境和微生物活动的气候条件有关。但是，研究地点使用浅色的Andosol排放的N2O类似于Andosol的排放，但比其他土壤类型（例如，布朗森林土壤，布朗低地土壤，灰色低地土壤，湿Andosol和泥炭土壤的排放）少。 。该研究地点的浅色Andosol具有较低的背景辐射。

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