Effect of soil temperature and moisture on O2 evolution rate of cultivated Phaeozem: analyses of a long-term field experiment
Lopes de Gerenyu, V.O.(RAS, Pushchino (Russian Federation). Inst. of Physicochemical and Biological Problems of Soil Science) | Kurganova, I.N.E-mail:[email protected] | Rozanova, L.N. | Kudeyarov, V.N.
The CO2 evolution rate from cultivated clay Phaeozem (Moscow region, Russia) were studied under field conditions from November 1997 to October 2002. The daily mean CO2 evolution rate varied widely - from 0.9 to 246 mg C/square m/h. The total annual CO2 flux from cultivated Phaeozem averaged 352+/-148 g C/square m/yr, the interannual variability amounted to 42%. Exponential equations were used to describe the relationship between CO2 emission and soil temperature. The temperature coefficient Q10, which was 2.3 for the whole data set was essentially higher (3.2-3.6) during the spring and autumn. The correlation between CO2 evolution rate and soil moisture was insignificant for the whole period, winter, spring and autumn seasons as well. On the contrary, this correlation was positive during the summer (R=0.74, P less than 0.001).
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