Temporal N2O evolution patterns of both soils by
different DWC are depicted in Fig.3. With regard to
arable and grassland soils against different
wt
, the
flows started rising after the 38
th day of incubation.
Such an increase was negligible in the control (0-10
µg/kg/hr) treatments of arable soils, but continued to
rise up to 24.09 µg/kg/hr in grassland soils. During
periods of background emission, SDWC treatment
induced a N2O-N peak of 30.78 µg /kg/hr and 24.81
µg/kg/hr grassland and arable soils, respectively, and
only appeared on the fifty day of incubation when the
treatment returned to the actual moisture content of
32%
wt
(Fig.3).
The flows were within the range of 0.4-1.8 µg /kg/
hr during the first month of all treatments (Fig.2).
MDWC and LDWC yielded two higher peaks(16. and
14.11µg/kg/hr, respectively)in arable soils within the
second month of incubation (Fig.3). In MDWC of
grassland soils, the flow also rose to 13.08 µg /kg/hr
when brought back to 15%
wt
.
Based on the cumulative flow