Abstract
A rainfall simulator was used to investigate the relationship between canopy storage, C, and drainage rate, D s, of bracken litter. Measured maximum storage, C max, for the litter was 4.84 mm kg −1 m −2, and litter storage capacity, C min, 1.67 mm kg −1 m −2. Drainage rate D s and C were found to be related by the function: D s= e K(C−C min ) −1 Optimisation of this function for K accounted for 96% of the variation between D s and C. Comparison of the values of K and C min with those reported previously ∗ ∗ Pitman, 1989. showed that K was a simple function of C min for both bracken litter and bracken fronds: lnK=1.268(±0.024)−0.664(±0.023) lnC min R 2=0.991, n=9 Because K is predictable from values of C min, determined from the leaf area index or biomass (kg m −2), eqn. (1) has wide applicability to both bracken litter and bracken frond drainage rates. The importance of litter storage capacity is also discussed.
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