A 2nd wood stake study in Idaho was established in June 2001 in the LTSP plots in the Payette National Forest (Grand fir habitat type). The experimental design and sampling protocols are similar to the study at Priest River, except that: (1) each LTSP treatment and the uncut control has two replicates, and (2) western hemlock stakes were replaced by Douglas-fir (Pseudotsuga menziesii).

Mineral soil - the same as Priest River. A total of 1500 stakes were installed on this site (25 stakes x 3 species x 5 treatment plots x 2 microplots x 2 replicates). Soil moisture, temperature, and CO₂/O₂ levels are being measured at 10, 20 and 30 cm depths.

Litter layer (forest floor) - fifty wood stakes (2.5 x 2.5 x 15 cm) of each tree species were placed in plots which had no litter layer treatment: 1) no OM removal, no compaction (OM₀C₀), 2) no OM removal, heavy compaction (OM₀C₂), and 3) uncut control stand. Twenty-five stakes were installed at the forest floor/mineral soil interface, and 25 stakes placed on the litter layer surface - a total of 1800 stakes (25 stakes x 3 species x 3 treatment plots x 2 microplots x 2 litter layer locations x 2 replicates). In addition, 600 stakes were placed on the soil surface of plots which had litter layer treatments: 1) heavy OM removal, no compaction (OM₂C₀), and 2) heavy OM removal, heavy compaction (OM₂C₂) - 25 stakes x 3 species x 2 treatment plots x 2 microplots x 1 litter layer location x 2 replicates. Soil temperature is being measured at the litter layer/mineral soil interface in each treatment.

Next Forest - Oregon USA >