engleski

Temporal variation of soil respiration under energy and arable crops

Crop type and meteorological parameters play an important role in the temporal variation of soil respiration, which varies significantly among plant biomass and climate conditions. The influence of growing an energy crop (Giant Miscanthus) and arable crops (winter wheat, maize), as well as meteorological parameters on soil respiration is represented in this paper. Soil respiration and meteorological parameters were studied from April 2013 until October 2013 in the continental part of Croatia (Bistra, Daruvar, Potok). Soil CO2 concentrations were measured by the in situ closed static chamber method. Soil respiration had different seasonal patterns within crops with average monthly soil respiration rates ranging from 22.7-32.1 kg C- CO2 ha-1day-1 for Giant Miscanthus, 25.6-41.8 g C-CO2 ha-1day-1 for wheat and 8.0-22.1 kg C- CO2 ha-1day-1 for maize, respectively. Average amount of carbon emitted to the atmosphere by soil respiration in one year is significantly lower under maize (5.95 t ha-1), compared to wheat (11.32 t ha-1) and Giant Miscanthus (10.51 t ha-1). Depending on the crop type, 4- 19% of soil respiration depends on air temperature and 2-53% on relative air humidity. Further research on other controlling factors of soil respiration is recommended.

soil CO2 emissions, Giant Miscanthus, winter wheat, maize, Croatia

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