ENVIRONMENTAL CONSEQUENCES in rocky mountain coniferous ...

Control Chipped Picked up Broadcast Piled and Pilsd and
and and Burned Burned Burned
Spread Removed (in roml (between row1
LOGGING RESIDUE DISPOSAL TREATMENTS
Figure 2.--Bulk density of the surface 2-inches of so.i.2 associated with various
residue treatments on ZodgepoZe pine clearcuts .
TOTAL POROSITY
The effects of the residue treatments on total porosity of the surface 2-
inches of soil are shown in figure 2. In 1973 the lowest (poorest) soil porosity
occurred on blocks where the residue was chipped and respread. These, of course,
were the sites having the highest bulk densities. Similarly, the next lowest
soil porosity occurred on sites having the second highest bulk densities, namely,
where the residue was removed by dozer-pi1 ing.
By 1977, soil porosity on those sites where chips had been respread had
improved substantially. On the other hand, the lowest porosity occurred on sites
from which residue had been removed by dozer-piling.
Between 1973 and 1977, no significant changes occurred in the soil porosity on
blocks where the residue had been picked up for chipping but not respread, on
broadcast-burned blocks, or beneath the burned windrows on dozer piled blocks.
By 1977, the highest soil porosity was encountered in the adjacent unlogged
forest areas where the bulk density was lowest.