Nitrification in coniferous forest soils
Nitrification in coniferous forest soils
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DOI：
10.1007/bf00009394
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发表时间：
1990-10
期刊：
影响因子：
4.9
通讯作者：
K. Killham
中科院分区：
文献类型：
--
作者：
K. Killham
苏格兰东北部许多针叶林的森林地面净硝化率往往很低或可以忽略不计。最有可能的过程控制是基质的可用性，pH值，化感作用，水势，营养状况和温度。这些都是讨论有关的净硝化率和潜在速率的实地和实验室研究。真菌构成了迄今为止最大的一部分硝化菌群落在针叶林地面。目前对这些系统中自养生物的分布和活性知之甚少，但可以肯定的是，在针叶林土壤中，由于硝化真菌代谢的多样性，可能存在多种有机和无机硝化途径。自由基可能参与了针叶林土壤的真菌硝化作用。针叶林土壤硝化作用的完整认识只能通过野外氮通量的表征，如通过使用15 N。这必须与所涉及的生物体的生理生态特征相结合，以解决针叶林土壤硝化作用的复杂性。
Net nitrification rates tend to be low or negligible in the forest floor of many coniferous forests of North-East Scotland. The most likely process controls are substrate availability, pH, allelopathy, water potential, nutrient status and temperature. These are discussed in relation to field and laboratory studies of net and potential rates of nitrification.Fungi make up by far the largest part of the nitrifier community in the coniferous forest floor. Very little is known about the distribution and activity of autotrophs in these systems, although it is certain thatin vitroevidence suggesting autotrophs cannot nitrify at pH levels characteristic of coniferous forest soils is unrealistic.Because of the metabolic diversity of nitrifying fungi, a variety of organic and inorganic nitrification pathways may exist in coniferous forests. The possible involvement of free radicles in fungal nitrification in coniferous forest soils is also suggested.A complete understanding of nitrification in coniferous forest soils can only result from field characterisation of N flux such as through the use of15N. This must be combined with ecophysiological characterisation of the organisms involved in order that the complexity of nitrification in coniferous forest soils can be resolved.