0105406 - UPB-H 20043011 RIV GB eng J - Článek v odborném periodiku
Šimek, Miloslav - Elhottová, Dana - Klimeš, F. - Hopkins, D. W.
Emissions of N2O and CO2, denitrification measurements and soil properties in red clover and ryegrass stands.
[Emise N2O a CO2, charakteristiky denitrifikace a půdní vlastnosti v porostu jetele červeného a jílku.]
Soil Biology and Biochemistry. Roč. 36, - (2004), s. 9-21. ISSN 0038-0717. E-ISSN 1879-3428
Grant ostatní: NATO(XX) CRG 97/1331; Evropská unie(XE) EVK2-CT-2000-00096
Výzkumný záměr: CEZ:AV0Z6066911; CEZ:MSM 122200003
Klíčová slova: emission * denitrification * denitrifying enzyme activity
Kód oboru RIV: EH - Ekologie - společenstva
Impakt faktor: 2.234, rok: 2004

The relationship between the fluxes of nitrous oxide (N2O) and carbon dioxide (CO2), and their concentrations in the soil air, three different measures of potential denitrification, soil moisture, soil temperature and precipitation were investigated in soils from beneath ryegrass (Lolium multiflorum Lam.), red clover (Trifolium pratense L.) and mixture of ryegrass-red clover stands on a gleic cambisol. Investigations were carried out in order to test the hypothesis that the measure(s) of potential denitrification are good predictor(s) of N2O fluxes and thus may be used in empirical models of N2O emission. Potential denitrification characteristics used in this study involved (i) short-term denitrifying enzyme activity (DEA), (ii) long-term denitrification potential (DP), both determined in soils amended with nitrate and glucose, and (iii) denitrification rate (DR) measured using intact soil cores. Flux measurements were made using cylindrical chambers (internal diameter 31 cm, volume 0,015 m3). The fluxed of N2O and CO2 and many other characteristics showed large spatial and temporal variability. Emissions of N2O from the grass plots were closely related to N2O concentrations in the soil atmosphere at 22,5 cm depth. Most soil properties did not correlate with N2O fluxes. It was concluded that DP was not a good predictor for N2O flux. DEA did not show significant relationship with N2O flux, but it suggested that if determined in representative, large soil samples, DEA could be a predictor of N2O fluxes; this assumption needs, however, verification. The only potential denitrification characteristic which was significantly related to N2O emission both in grass and clover treatments was DR, which was determined in soil cores

Práce byla zaměřena na ověření hypotézy, že charakteristiky potenciální denitrifikace je možné využít pro odhady produkce oxidu dusného v půdě a jeho emisí. Studované charakteristiky zahrnovaly: krátkodobou aktivitu denitrifikačních enzymů (DEA), denitrifikační potenciál (DP) a denitrifikaci z neporušených půdních monolitů (DR). Ukázalo se, že DP nemá žádný vztah k emisím oxidu dusného. Vztah DEA a emisí nebyl zcela jednoznačný ale pokud by se pro měření DEA využívaly větší (dostatečně reprezentativní) vzorky půd, mohl by tento vztah být těsnější. Denitrifikace měřená u intaktních monolitů (DR) byla v těsném vztahu s emisemi stanovenými v terénu
Trvalý link: http://hdl.handle.net/11104/0012649