Starting from July 2013, the SFH technique was applied at six
sampling dates, in order to obtain Kfs measurements for a period of
about three months. These sampling dates were planned so as to
take into account two different initial soil water content values (ui).
To be more precise, as the Kfs measurements may be affected by
the ui value, three samples were taken on dates when the initial
soil water content was lower than the permanent wilting point
(ui< PWP). The same procedure was repeated for soil water
content within the range between PWP and
field capacity
(PWP < ui< FC). Depending on the specific ui value (on average,
this ranged from 0.14 to 0.30 cm3cm3) (Fig. 1), a pre-established
volume of water (ranging from 3500 to 1200 cm3) was poured in
the soil cylinder in few seconds, with an initial depth of ponding for
the SFH runs equal to 2–7 cm. Eq. (15) of Bagarello et al. (2004) was
used to calculate Kfs using the measured time elapsed during the
infiltration process, ta, which ranged between 1.5 and 39 min.
According to Elrick and Reynolds (1992) and regardless of
treatment, a value of the so-called a* parameter equal to
0.012 cm1 was used to calculate Kfs, as suggested for most
structured soils. A specific discussion about the choice of the a*
parameter was provided by Bagarello et al. (2014b, p. 496)Bagarello
et al. (2014b, p. 496). When preferential
flow along the edge
of the cylinders was observed, the corresponding measurements
were excluded. After the last Kfs measurements had been taken the
soil cylinders were placed indoors until optimal water conditions
for soil sampling were reached (i.e., about one month from the last
Kfs measurement).
Starting from July 2013, the SFH technique was applied at sixsampling dates, in order to obtain Kfs measurements for a period ofabout three months. These sampling dates were planned so as totake into account two different initial soil water content values (ui).To be more precise, as the Kfs measurements may be affected bythe ui value, three samples were taken on dates when the initialsoil water content was lower than the permanent wilting point(ui< PWP). The same procedure was repeated for soil watercontent within the range between PWP andfield capacity(PWP < ui< FC). Depending on the specific ui value (on average,this ranged from 0.14 to 0.30 cm3cm3) (Fig. 1), a pre-establishedvolume of water (ranging from 3500 to 1200 cm3) was poured inthe soil cylinder in few seconds, with an initial depth of ponding forthe SFH runs equal to 2–7 cm. Eq. (15) of Bagarello et al. (2004) wasused to calculate Kfs using the measured time elapsed during theinfiltration process, ta, which ranged between 1.5 and 39 min.According to Elrick and Reynolds (1992) and regardless oftreatment, a value of the so-called a* parameter equal to0.012 cm1 was used to calculate Kfs, as suggested for moststructured soils. A specific discussion about the choice of the a*parameter was provided by Bagarello et al. (2014b, p. 496)Bagarelloet al. (2014b, p. 496). When preferentialflow along the edgeof the cylinders was observed, the corresponding measurementsถูกแยกออก หลังจากล่าสุด Kfs วัดมีการดำเนินการภาชนะบรรจุดินถูกวางในร่มจนถึงสภาพน้ำที่เหมาะสมในดิน ได้ถึงสุ่มตัวอย่าง (เช่น ประมาณหนึ่งเดือนจากล่าสุดKfs วัด)
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