Movement Of Basidiomycete Litter Mats

There was a trend (though not significant, R2 — 0.5019, P — 0.18) of movement of mats proportional to slope, over the 18-month study at Bisley and Icacos, mats on shallow slopes more frequently moving downslope while those on steeper slopes more frequently moving uphill (Figure 5). Two factors probably contributed to this pattern. First, as noted above, many of the shallower slopes in Bisley were in valleys subjected to overland flow during torrential storms (Weaver et al., 1987). Thus, litter and soil organic matter that has been exported from slopes is probably exported in streams during high rainfall events (Weaver et al., 1986; Lodge and Asbury, 1988), resulting in the highest soil organic matter contents being located on ridges and slopes (Weaver et al., 1986) rather than in bottomlands, as occurs in the Appalachian Mountains of the USA (Orndorff and Lang, 1984). Mortality and damage to basidiomycete mycelia from overland flow was higher in valleys than on slopes in the Bisley plots during this study. Second, litter mats acted as terrestrial debris dams, and the basidiomycetes then grew into litter that had tumbled downslopes and accumulated on their upslope side.

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