. Brigham Young University science bulletin. Biology -- Periodicals. 5 BRIGHAM YOUNG UNIVERSITY SCIENCE BULLETIN. Fig. 3. Aspect of the Wetherill Burn in July 1963. Dead snags of the former pinyon-juniper forest show little weathering. The mountain-brush species, released from competition with the trees, are becoming more dominant. Elevation, 7,650 feet. the observation plots. Gambel oak, for example, was not sampled but was abundant along the edges of the ridge. Bitterbrush (Piirshia tridentata), too, was com- mon in the burn but not in the immediate area. A list- ing of those species occurri
. Brigham Young University science bulletin. Biology -- Periodicals. 5 BRIGHAM YOUNG UNIVERSITY SCIENCE BULLETIN. Fig. 3. Aspect of the Wetherill Burn in July 1963. Dead snags of the former pinyon-juniper forest show little weathering. The mountain-brush species, released from competition with the trees, are becoming more dominant. Elevation, 7,650 feet. the observation plots. Gambel oak, for example, was not sampled but was abundant along the edges of the ridge. Bitterbrush (Piirshia tridentata), too, was com- mon in the burn but not in the immediate area. A list- ing of those species occurring in the macroplot area, however, is given in Table 13. The stand was characterized by serviceberry (Ame- lanchier utahemis). Yucca baccata, Poa fendleriana, and Heterotheca villosa. One pinyon pine sapling occurred in the macroplot and was included in the line intercept. Since the pith date by ring count was 1953, this tree was not part of the earlier planting program. Such a delay in natural establishment of the tree component is consistent with the postfire recov- ery on Mesa Verde. Regardless of the extent of the area burned, 20 to 30 years usually lapse before the pinyon-juniper element begins to return. The few nonvascular plants encountered are, for the most part, the moss Grimmia, found on rocks scattered over the ridge. A small complex of lichens. principally CoUema tenax, covers parts of the soil sur- face. Soil. The soil profile (Fig. 4 and Table 4) was studied at a pit located a short distance down the ridge from the macroplot. According to Parsons (personal communi- cation), the soil representative of this site is tenta- tively identified as Roubideau very fine sandy loam. It has developed primarily from weathered products of the underlying sandstone, although eolian soils have modified it to some extent. Soil depth around the macroplot, however, is shallower. Holes augered at the corners of the sample revealed the following depths to bedrock: southeast corner, 14
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