Comparison of soil CO2 emissions from three different tillage methods on chernozem soil

Márton Dencső,Zsófia Bakacsi,Ágota Horel,Eszter Tóth

doi:10.5194/egusphere-egu21-14675

Abstract

&lt;p&gt;Tillage practices influence soil CO&lt;sub&gt;2&lt;/sub&gt; emissions, hence many research investigate the long-term effects of conservation and conventional tillage methods e.g. ploughing and no-tillage on soil greenhouse gas emission.&lt;/p&gt;&lt;p&gt;The experiment site is an 18-years-old long-term tillage trial established on chernozem soil. During 2020, we took weekly CO&lt;sub&gt;2 &lt;/sub&gt;emission measurements in the mouldboard ploughing (MP), no-tillage (NT), and shallow cultivation (SC) treatments Tillage depth was 26-30 cm, 12-16 cm and 0 cm in the cases of MP, SC and NT respectively. The experiment was under wither oat cultivation.&lt;/p&gt;&lt;p&gt;We investigated the similarity in the CO&lt;sub&gt;2&lt;/sub&gt; emission trends of SC to MP or NT treatments. Besides CO&lt;sub&gt;2&lt;/sub&gt; emission measurements, we also monitored environmental parameters such as soil temperature (Ts) and soil water content (SWC) in each treatment.&lt;/p&gt;&lt;p&gt;During the investigated year (2020 January - December) SC had higher annual mean CO&lt;sub&gt;2&lt;/sub&gt; emission (0.115&amp;#177;0.083 mg m&lt;sup&gt;-2&lt;/sup&gt; s&lt;sup&gt;-1&lt;/sup&gt;) compared to MP (0.099&amp;#177;0.089 mg m&lt;sup&gt;-2&lt;/sup&gt; s&lt;sup&gt;-1&lt;/sup&gt;) and lower compared to NT (0.119&amp;#177;0.100 mg m&lt;sup&gt;-2&lt;/sup&gt; s&lt;sup&gt;-1&lt;/sup&gt;). The difference of the CO&lt;sub&gt;2&lt;/sub&gt; emissions was significant between SC and MP (p&lt;0.05); however, it was not significant between SC and NT (p&gt;0.05) treatments. The Ts dependency of CO&lt;sub&gt;2&lt;/sub&gt; emission was moderate in all treatments. CO&lt;sub&gt;2&lt;/sub&gt; emissions were moderately depended on SWC in MP and SC, and there was no correlation between these parameters in NT.&lt;/p&gt;&lt;p&gt;The annual mean CO&lt;sub&gt;2&lt;/sub&gt; emission of the SC treatment was more similar to the NT, than to the MP treatment.&lt;/p&gt;

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