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Fig. 4.5.2.
DOC concentrations in drainage water and composite surface-topsoil discharge from
two replicate HND plots (a and b). DOC concentrations in runoff from HNU plots are also shown for
comparison (n= 2). See Table 4.5.1 for notation.
Rainfall intensity
A comparison of the temporal measurements of DOC concentration in the
waters leaving the plots with daily levels of rainfall (Fig. 4.5.3) shows that
rainfall intensity and hence the rate of passage of water either through or
over the soil strongly influences the amount of DOC exported. In general,
for both the drained and undrained plots, higher concentrations of DOC
occurred at times of high rainfall. However, regressing DOC concentration
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