Geoscience Reference
In-Depth Information
Fig. 18.11 Polyacrylamide (PAM) effects on runoff and soil loss cumulative runoff versus
a cumulative rainfall and b sediment yield, for a natural rainfall study. Bars for final points
indicate P \ 0.05 confidence; C and P are untreated and treated sites, respectively (modified after
Flanagan
et
al.
2002
)
Originally
published
as
Fig. 1
in
Transactions
of
the
ASAE
45
(5):1339-1351.
Reprinted
with
permission
of
the
American
Society
of
Agricultural
and
Biological Engineers, St. Joseph Michigan
treatment significantly reduced cumulative runoff and soil loss (Fig.
18.11
), per-
sisting over about 60 days.
General trends suggest that medium- and high-charge density anionic and
neutral PAMs produce the greatest increases in infiltration, compared with con-
trols. Lentz et al. (
2000
) noted that compared to control and low molecular weight
treatments, the medium- and high-molecular weight PAM seals contained a greater
number of fluid-conducting pores. Despite the fact that PAM impacts on furrow
soils were temporary, the effect on soil morphology due to changes in sediment
erosion patterns was irreversible.
