 |
| Titel |
Nitrous oxide emissions from soils in southern Poland under various tillage conditions. |
| VerfasserIn |
Michal Galkowski, Damian Zięba, Klaudia Ciaciek, Jaroslaw Necki, Kazimierz Różański |
| Konferenz |
EGU General Assembly 2015
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250107800
|
| Publikation (Nr.) |
 EGU/EGU2015-7514.pdf |
|
|
|
|
|
| Zusammenfassung |
| Due to close ties of nitrogen cycle with the production of food, appropriate mitigation
policies need to be considered in order to reduce the impact of reactive N compounds on both
human health and the environment. These policies strongly rely on quantitative information
with respect to fluxes of reactive nitrogen compounds to the atmosphere and mechanisms
controlling those fluxes on a various time and space scales. One of these compounds is
nitrous oxide - currently the most important human-emitted ozone depleting substance and
one of the most important greenhouse gases.
In this study, which is a part of broader, regional (Southern Poland) analysis of nitrous
oxide circulation, we present the results of field measurements performed at the Institute of
Plant Acclimatization and Husbandry (ZDHAR) in Grodkowice (Malopolska). Several
representative sites have been selected for measurements of N2O emissions during two
campaigns – in spring (March) and autumn (October) 2014. The investigated crops were
chosen to represent the regional agriculture and included wheat, canola and maize under
various tillage conditions (with and without tilling), as well as an uncultivated grassland as a
control site.
The static chamber method was chosen to quantify soil-atmosphere N2O fluxes. Chamber
enclosures have been performed every 3-5 days, depending on the conditions prevailing at the
sites during the intermediate periods (e.g. rainfall or fertilization events). From each
enclosure, five 50-ml air samples have been collected for subsequent analysis of nitrous oxide
concentrations. Well-established gas chromatography methods, with a precision
of a single N2O measurement better than 0.5 ppb were employed. The measured
concentrations were then used in a linear emission model to calculate N2O fluxes. Other
trace gases (CH4, CO2, SF6) were also measured in each sample for quality control
purposes.
Result for both campaigns show large variability of N2O emissions, with maximum
fluxes in the order of 40 kg N-N2O ha-1 yr-1, driven mainly by availability of nitrogen in
soil (fertilization events) and water (measurements of soil water content were performed and
analysed). For fertilized sites, largest emissions value were observed several days after the
rainfall events, while the control site remained stable throughout the campaign period and not
exceeding 0.5 kg N-N2O ha-1 yr-1. |
|
|
|
|
|
|