Abstrakt
This study examined the number, distribution, and connectivity of
biopores (>1 mm) in a sandy loam till with tile drains located at
1.2-m depth. Two areas (6.5 by 1 m, 10 m apart) were irrigated within 6
to 8 h with 50 mm of water containing the dye Brilliant Blue (2.2 g L−1)
using a field sprayer. Groundwater was initially below drain depth. The
distribution of stained and unstained biopores was examined in 15- and
30-cm-wide horizontal terraces in 0.5-m-long sections along the 6.5-m
irrigated transect at up to eight depths (15–175 cm), for a total
investigated area of 14 m2 This extensive data set showed
that the number of biopores were of similar magnitude at both study
sites in and outside the drain trench, ranging from 0 to 1114 m−2 in the 14-m2 examined section. The number of stained biopores (0–833 m−2)
was unevenly distributed in the horizontal direction and seemed
unaffected by distance to the drain trench (0–5.5 m), while in vertical
sections with numerous dyed biopores at 150-cm depth, staining continued
farther down in fractures. Staining in the drain trench was associated
with biopores, voids, fractures, and the soil along the pipe, which may
indicate that the tile drain took over the role of fractures in the
till. Consequently, the connectivity of biopores with fractures or
drains may have an important impact on staining patterns and on
preferential flow phenomena.
Originalsprog | Engelsk |
---|---|
Sider (fra-til) | 1073-1079 |
Antal sider | 7 |
Tidsskrift | Vadose Zone Journal |
Vol/bind | 9 |
Udgave nummer | 4 |
DOI | |
Status | Udgivet - nov. 2010 |
Programområde
- Programområde 2: Vandressourcer