This isotopic trend has been explained by the growing importance of agricultural soils as a source of N2O and its relatively depleted isotopic signature (Perez et al. 2001).

• 这同位素的趋势已经解释的重要性日益增加农业土壤中的一个来源N2O和其相对枯竭的同位素签名（佩雷斯等人。2001年） 。