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首页> 外文期刊>日本土壤肥料学雑誌 >Effect of external NH4+ on nitrification of A horizon soils in various forests.
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Effect of external NH4+ on nitrification of A horizon soils in various forests.

机译：外部NH4 +对不同森林A层土壤硝化的影响。

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摘要

To evaluate the difference of the H+ via nitrification among soil types or vegetation types when external NH4+ was added to forest soils and to investigate the soil factors that control nitrification, leaching incubation experiments were conducted adding 3 concentrations of NH4+ nutrient solutions (0, 5.3, 15.9 mg Nthinlitre-1) weekly for 6 weeks. Fourteen A horizon samples differed in parent materials and vegetation (deciduous or coniferous). The results showed: (1) nitrification was restrained without NH4+ addition, whereas it was promoted with NH4+ addition after 6 weeks of incubation. The nitrate product with high-NH4+ addition was one to two times higher than that with low-NH4+ addition; (2) in four samples (coniferous 3, deciduous 1) with <10% Ca saturation, nitrification did not occur even with NH4+ addition; (3) nitrate products were generally higher in the samples from the deciduous forests than the coniferous forests. Samples with shale and serpentinite parent materials had lower nitrification potentials; (4) the properties of nitrification potential from the release of H+ indicated two pathways of nitrification; one had NH4+ as the substrate and the other had organic nitrogen as the substrate; and (5) results of multiple regression analyses suggested that pHKCl and exchangeable Ca2+ contributed to nitrification and the release of H+ via nitrification.
机译：为了评估在森林土壤中添加外部NH4 +时土壤类型或植被类型中通过硝化作用产生的H +的差异，并研究控制硝化作用的土壤因素，进行了3​​种浓度的NH4 +营养液的淋洗培养实验（0、5.3，每周15.9 mg Nthinlitre-1），持续6周。 14个地平线样品在母本材料和植被（落叶或针叶树）上有所不同。结果表明：（1）孵育6周后，不添加NH4 +抑制硝化作用，而添加NH4 +促进硝化作用。高NH4 +添加量的硝酸盐产物比低NH4 +添加量高一到两倍。 （2）在钙饱和度小于10％的四个样品（针叶3，落叶1）中，即使添加NH4 +，也不会发生硝化作用; （3）落叶林样本中的硝酸盐产品通常高于针叶林。页岩和蛇纹石母体材料的样品具有较低的硝化潜能。 （4）H +释放引起的硝化电位特性表明了硝化的两个途径。一个以NH4 +为底物，另一个以有机氮为底物。 （5）多元回归分析的结果表明，pHKCl和可交换的Ca2 +促进硝化作用，并通过硝化作用释放H +。

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