| Autor: |
D.J. Nixon, J.C. Ryden, J.H. Skinner |
| Rok vydání: |
1987 |
| Předmět: |
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| Zdroj: |
Soil Biology and Biochemistry. 19:753-757 |
| ISSN: |
0038-0717 |
| DOI: |
10.1016/0038-0717(87)90059-9 |
| Popis: |
Two systems for determining rates of denitrification, both based on the acetylene-inhibition technique, have been compared. One system involved in situ treatment of soil with C2H2 using an enclosure (500 × 150mm) placed over the soil surface followed by measurement of nitrous oxide (N2O) emission. The other involved incubation, in the field, of soil cores with 5% (v/v) C2H2 in modified fruit preserving jars. Agreement between the two systems of measurement was close for well-drained soils over a wide range of rates of denitrification (0.005–1.27 kg N ha−1 day−1). Results obtained with poorly-drained soils having low air-filled porosities indicated that the incubation system with soil cores overcame the problems associated with applying the enclosure technique to soils of this type. Denitrification in the incubation system could be terminated by the addition of chloroform after an appropriate period (usually 24 h). The N2O concentration in the air space of the jars then remained essentially constant for 14 days. This provided a second advantage in allowing the system to be used at sites remote from analytical facilities. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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