Soil surface carbon dioxide exchange rate as affected by soil texture, different long-term tillage application and weather
Journal Title: ŽEMDIRBYSTĖ-AGRICULTURE - Year 2010, Vol 97, Issue 3
Abstract
The current study was carried out at the Lithuanian Institute of Agriculture in Dotnuva on an Endocalcari-Epihypogleyic Cambisol (CMg-p-w-can). It was aimed to investigate the effect of air and soil temperature, air humidity and gravimetric water content (GWC) on soil CO2 exchange rate (NCER) under conventional (CT), reduced (RT) and no-tillage (NT) management on loam and sandy clay loam soils. Application of NT on both loam and sandy loam soils increased soil GWC and decreased soil air temperature compared to CT and RT both under dry and wet weather conditions. NCER under dry weather conditions, on loam soil under NT was higher by 0.024–0.033 g CO2-C m-2 h-1 than under RT or CT, while on sandy loam soil NCER was lower by 0.011 g CO2-C m-2 h-1 than under CT application. No significant differences were registered when comparing NT with RT management. NCER under wet weather conditions, on the loam soil under NT was lower by 0.043 g CO2-C m-2 h-1 compared to CT, and insignificantly differed from RT; whereas on sandy loam NCER under wet weather conditions was lower by 0.069–0.087 g CO2-C m-2 h-1 than under RT and CT. Relatively hot air waves during summer resulted in sharp soil temperatures increase and soil GWC reduction. Dry and hot weather situation under moderate climatic conditions of the Baltic region could be attributed to NCER potential limiting condition either on loam or sandy loam soil and affecting all three tillage management practices investigated. Even small rainfall (to 13.5 mm event) essentially enhanced CO2 flux under dry weather conditions. It was noticed that warm weather conditions and higher than normal rainfall inhibited soil CO2 exchange rate. Soil NCER responded to changes of weather and soil state more sensitively in NT than in RT and CT application both under dry and wet environmental conditions.
Authors and Affiliations
Dalia Feizienė, Virginijus Feiza, Asta Vaidelienė, Virmantas Povilaitis, Šarūnas Antanaitis
Keywords
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