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首页> 外文期刊>Soil Science and Plant Nutrition >Relationship between N2O and NO emission potentials and soil properties in Japanese forest soils
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Relationship between N2O and NO emission potentials and soil properties in Japanese forest soils

机译：日本森林土壤中N2O，NO排放势与土壤性质的关系

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摘要

To determine the relationship between nitrous oxide (N2O) and nitric oxide (NO) emission rates and soil properties in forest soils, N2O and NO emission rates in soils were measured in incubation experiments under standardized temperature and water conditions (water content at a water-holding capacity of 60%) using soils packed into a cylindrical core, and variations in the soil properties were also determined. The N2O emission rates from nitrification and from denitrification were determined separately using a nitrification inhibitor (10 Pa acetylene). Soil samples were taken from 25 forest stands in a central temperate area of Japan. The N2O and NO emission rates were highly variable, even under the standardized temperature and water-holding capacity (60%) conditions. According to a partial least squared regression model analysis, the C:N ratio and pH strongly affected the N2O emission rate, whereas NO3, water-soluble Al and the C:N ratio strongly affected the NO emission rate. The C:N ratio negatively affected the emission rate of both N oxide gases, suggesting that N mineralization is an important factor in the rates of N oxide gas emission. The acetylene inhibition experiment showed that N2O emission from denitrification was positively affected by pH, water-filled pore space and filling density, and negatively affected by the C:N ratio, total carbon and total nitrogen.
机译：为了确定森林土壤中一氧化二氮（N2O）和一氧化氮（NO）排放速率与土壤性质之间的关系，在孵化实验中，在标准温度和水条件（水保持能力为60％），使用装在圆柱状芯中的土壤，并确定了土壤特性的变化。使用硝化抑制剂（10 Pa乙炔）分别确定硝化和反硝化过程中的N2O排放速率。土壤样品取自日本中部温带地区的25个林分。即使在标准温度和持水量（60％）条件下，N2O和NO的排放速率也存在很大差异。根据偏最小二乘回归模型分析，C：N比和pH强烈影响N2O排放速率，而NO3，水溶性Al和C：N比强烈影响NO排放速率。 C：N比对两种N氧化物气体的排放速率均产生负面影响，这表明N矿化是N氧化物气体排放速率的重要因素。乙炔抑制实验表明，反硝化过程中的N2O排放受到pH，充水孔隙空间和填充密度的正影响，而受C：N比，总碳和总氮的负面影响。

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