Three soil tillage systems, representing three levels of soil disturbance, were tested for their effect on CO2 emission from the soil. For these studies, large (10 cm high, 10 cm in diameter) undisturbed soil columns were incubated in a climate chamber, thus combining the advantages of laboratory and field methods, as it was possible to record the CO 2 emission from soils with undisturbed structure under controlled temperature and moisture conditions. A further aim was to optimise a newly elaborated measuring technique, with special regard to the determination of optimum incubation time. The data were evaluated and the timing of sample taking was optimised accordingly. No statistical difference was found between the emission values measured after 3 and 6 hours of incubation, so the time was set to 3 hours. A comparison of the emission values recorded for samples originating from the three soil tillage methods [ploughing (SZ), direct drilling (DV), disking combined with deep loosening (L+T)] indicated that the highest CO 2 emissions arose from the direct drilling treatment and the lowest from the ploughing treatment. This could be attributed to the higher available organic C content in the less disturbed treatment. In the soil moisture content range tested, CO 2 emissions were found to rise with an increase in soil moisture content at the beginning of the experiment, but in the fourth week a decrease was observed in the value of CO 2 emission at soil moisture contents around the field water capacity. In all the treatments the emissions gradually declined as the substrates were exhausted. The results confirm that, due to the rapidity and complexity of processes taking place in the soil, it is necessary and important for mutually complementary field and laboratory measurements to be evaluated together.
|Translated title of the contribution||Effect of tillage on soil carbon dioxide emission I. Testing a laboratory method on undisturbed soil columns|
|Number of pages||12|
|Journal||Agrokemia es Talajtan|
|Publication status||Published - Dec 1 2009|
ASJC Scopus subject areas
- Agronomy and Crop Science
- Soil Science