Abstract
The temporal and spatial distribution of the nitrite-oxidizing community of a non-fertilized, semi-natural grassland soil was studied to obtain more insight into the possible variation in nitrate production in this soil throughout the year. Data describing the size, potential nitrite-oxidizing activity and serotype composition of the nitrite-oxidizing community are reported. In addition, several abiotic soil parameters potentially related to the activity of this community were measured. Whereas numbers and potential activities largely varied with time and place, the specific affinity for nitrite oxidation, defined as the ratio V max/ K m, was relatively constant. The serotypes Nitrobacter agilis, N. winogradskyi and N. hamburgensis were all present in the top 5-cm soil in every 500-g sample examined, showing that these species co-exist in this soil.
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