Treesearch

Advance reproduction of white fir and red fir released by cutting overmature over-story was studied at the Swain Mountain Experimental Forest in northern California, at 6,300 feet elevation. Seedling and sapling height growth before logging was only 0.1-0.2 foot per year. Five years after cutting, seedling and sapling height growth had accelerated to about 0.5 to 0.8 foot annually, with better trees growing 0.9-1.1 foot. Radial growth rate at ground level increased from 70 to 100 rings pet inch to 7 to 12 rings; some trees grew 2 to 4 rings. Damage to advance reproduction was caused by...

This report updates an earlier checklist, published in 1955, of vertebrate fauna found on the San Joaquin Experimental Range, in Madera County, California. Nineteen new species have been recorded since 1955. This report records the occurrences of seven fish, eight amphibians, 19 reptiles, 38 mammals, and 149 buds. References to research on individual species are included.

The boles of 32 recently killed, and 41 living, white fir were examined for embedded fir engraver (Scolytus ventralis) attack scars. Of 287 scars found in annual rings for the years 1934-69, only 2 to 3 percent represented reproductively successful attacks. Trends in scar abundance were directly correlated with trends in white fir killed by S. ventralis on 15 plots from 1939 to 1954. Influence of weather, host tree growth, and logging on yearly abundance of scars was examined by multivariate regression analysis. Years with increased scar abundance were preceded by at least 1 year of...

The visual impacts of alterations to the landscape can be studied by setting up Landscape Control Points–a network of permanently established observation sites. Such observations enable the forest manager to anticipate visual impacts of management decision, select from a choice of alternative solutions, cover an area for comprehensive viewing, and establish a method to integrate visual analysis with multiple-use planning. The visible landscape can be plotted by direct field observations, by laying out a series of sections as rays from a single LCP, or by a computerized mapping technique....

Density of embedded scars resulting from old fir engraver (Scolytus ventralis Lec.) attacks was assessed in 3,430 bole cross sections cut from 603 white firs growing in both cutover and in virgin old-growth stands in northern California. Mean scar density was directly related to percentage of mature stand removed by logging and was higher in suppressed and intermediate, compared to dominant, fir. Inverse relationships were found between scar density and site quality, tree diameter, height, age, volume, and mean growth rate. A risk rating system based on tree and stand characteristics...

About a mile north of Gasquet there is a very small flat drainage which flows toward the south with a slope of about 25 percent. Extensive stands of Darlingtonia can be found in the minute creek in an area extending about 1/3 mile in length and 10 to 50 yards in width. Growing amongst the Darlingtonia are scattered Pinguicula.

Drosera anglica abound, growing in all moist areas where water at this time of the year was less than tout two inches deep and continuing up to perhaps one inch above the water line, forming a reddish-green carpet. Many Drosera thus were submerged by two inches but thriving nevertheless