Temperature dependence of nitrification,denitrification, and turnover of nitric oxide in different soils |
| |
Authors: | Omar A. L. O. Saad Ralf Conrad |
| |
Affiliation: | (1) Fakultät für Biologie, Universität Konstanz, W-7750 Konstanz, Germany;(2) Max-Planck-Institut für Terrestrische Mikrobiologie, Karl-von-Frisch-Strasse, W-3550 Marburg, Federal Republic of Germany |
| |
Abstract: | Summary The temperature dependence of the NO production rate and the NO consumption rate constant was measured in an Egyptian soil, a soil from the Bavarian Forest, and a soil from the Donau valley, together with the temperature dependence of the potential rates of ammonium oxidation, nitrite oxidation, and denitrification, and the temperature dependence of the growth of NHinf4sup+-oxidizing, NOinf2sup--oxidizing, and NOinf3sup--reducing bacteria in most probable number assays. In the acidic Bavarian Forest soil, NO production was only stimulated by the addition of NOinf3sup-but not NHinf4sup+. However, NO production showed no temperature optimum, indicating that it was due to chemical processes. Most probable numbers and potential activities of nitrifiers were very low. NO consumption, in contrast, showed a temperature optimum at 25°C, demonstrating that consumption and production of NO were regulated individually by the soil temperature. In the neutral, subtropical Egyptian soil, NO production was stimulated only by the addition of NHinf4sup+but not NOinf3sup-. All activities and most probable numbers showed a temperature optimum at 25° or 30°C and exhibited apparent activation energies between 61 and 202 kJ mol-1. However, a few nitrifiers and denitrifiers were also able to grow at 8° or 50°C. Similar temperature characteristics were observed in the Donau valley soil, although it originated from a temperate region. In this soil NO production was stimulated by the addition of NHinf4sup+or of NOinf3sup-. Both NO production and consumption were stimulated by drying and rewetting. |
| |
Keywords: | NO production NO consumption Chemodenitrification Nitrification Denitrification Activation energy Temperature optimum |
本文献已被 SpringerLink 等数据库收录! |
|