Plant Soil Environ., 2005, 51(5):213-219 | DOI: 10.17221/3576-PSE

Effect of temperature and moisture on O2 evolution rate of cultivated Phaeozem: analyses of a long-term field experiment

V.O. Lopes De Gerenyu, I.N. Kurganova, L.N. Rozanova, V.N. Kudeyarov
Institute of Physicochemical and Biological Problems of Soil Science, RAS, Pushchino, Moscow Region, Russia

Soil temperature and moisture are the main ecological factors regulating the processes of production and emission of CO2 from soil surface. The CO2 evolution rate from cultivated clay Phaeozem (Russia, Moscow region; 54°50'N, 37°35'E) 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/m2/h. The total annual CO2 flux from cultivated Phaeozem averaged 352 ± 148 g C/m2/yr, the interannual variability amounted to 42%. We found significant linear trends (R = 0.46-0.55, P < 0.001) reflecting the relationship between CO2 emission and soil temperature through the whole observation period and during spring and autumn seasons as well. The exponential equations described these relationships for the same periods more adequately than the simple linear equations (R = 0.62-0.68, P < 0.01). The temperature coefficient Q10 comprised 2.3 (for the whole data set) and 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. During the summer, correlation between CO2 evolution rate and soil moisture was positive and very close (R = 0.74, P < 0.001), indicating that the soil moisture content was a main factor limitative the rate of CO2 emission from soil for this period.

Keywords: CO2 evolution rate; annual and seasonal CO2 flux; cultivated Phaeozem; temperature dependence; Q10; effect of soil moisture

Published: May 31, 2005  Show citation

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De Gerenyu VOL, Kurganova IN, Rozanova LN, Kudeyarov VN. Effect of temperature and moisture on O2 evolution rate of cultivated Phaeozem: analyses of a long-term field experiment. Plant Soil Environ. 2005;51(5):213-219. doi: 10.17221/3576-PSE.
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