Bacterial growth has been observed to be uncoupled from the
respiration pulse via two patterns. (i) Growth starts immediately
after rewetting, and increases linearly from low values to the levels
found in a constantly moist soil (Iovieno and Bååth, 2008). This
pattern for bacterial growth coincided with a soil respiration rate
thatwas highest within an hour after rewetting and then decreased
exponentially over time (the most frequently reported respiration
pattern, see above). (ii) Bacterial growth only starts after a clear lag
period, after which it increases exponentially to rates higher than in
a constantly moist soil (Göransson et al., 2013). This pattern coincided
with soil respiration rates that were elevated immediately
upon rewetting, remained elevated for hours, and then increased
further in an exponentialway (the less frequently reported pattern;
see above). One explanation for the difference in bacterial growth
and respiration responses connected with the two patterns may be
related to the length of drying prior to rewetting, ranging from a
few days (Iovieno and Bååth, 2008) to two months (Göransson
et al., 2013). Consequently, it needs to be resolved whether anextended drought period can change the bacterial growth responses
from pattern (i) to pattern (ii) within the same soil.
Bacterial growth has been observed to be uncoupled from the
respiration pulse via two patterns. (i) Growth starts immediately
after rewetting, and increases linearly from low values to the levels
found in a constantly moist soil (Iovieno and Bååth, 2008). This
pattern for bacterial growth coincided with a soil respiration rate
thatwas highest within an hour after rewetting and then decreased
exponentially over time (the most frequently reported respiration
pattern, see above). (ii) Bacterial growth only starts after a clear lag
period, after which it increases exponentially to rates higher than in
a constantly moist soil (Göransson et al., 2013). This pattern coincided
with soil respiration rates that were elevated immediately
upon rewetting, remained elevated for hours, and then increased
further in an exponentialway (the less frequently reported pattern;
see above). One explanation for the difference in bacterial growth
and respiration responses connected with the two patterns may be
related to the length of drying prior to rewetting, ranging from a
few days (Iovieno and Bååth, 2008) to two months (Göransson
et al., 2013). Consequently, it needs to be resolved whether anextended drought period can change the bacterial growth responses
from pattern (i) to pattern (ii) within the same soil.
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