Specifically, it was tested whether the presence
of O2 in the headspace modified the sequence and preference of
electron acceptor use under hypoxic conditions after prolonged
drought in arable soils. This laboratory study was conducted
in order to examine the use of electron acceptors: oxygen (O2),
nitrate (NO3¯) and nitrous oxide (N2O), during aerobic and
anaerobic respiration (denitrification). Agricultural soils (Typic
Dystrudepts) classified as sandy, silty and loamy soils from arable
top soils (0-30 cm) were used in the study. The change of oxidation
states of different chemical species in the soil affected the
use of electron acceptors during denitrification. The use of O2,
NO3¯ and net N2O use was gradual and differed greatly among
the soils. Furthermore, microorganisms were shown to be able to
use all three investigated electron acceptors simultaneously, but
with clearly visible preferences. The rate of electron acceptor use
per day differentiated the investigated soils into a few different
groups. Overall, the results of this study indicated that N2O was
a more preferable electron acceptor than NO3¯ when O2 was present
in the headspace for the most investigated soils. Moreover,
a correlation existed between the final electron acceptor use and
particle-size distribution and the native organic C content (Corg).
The rate of electron acceptor use per day calculated for O2, NO3¯
and N2O may provide very important information for distinguishing
the preference of electron acceptor use during aerobic and
nitrate respiration in agroecosystems under hypoxic conditions
after prolonged drought for different kinds of electron acceptor.
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