Treesearch

Very little information exists concerning growth and yield of giant sequoia (Sequoiadendron giganteum [Lindl.] Buchholz). For old-growth trees, diameter growth is the single factor adding increment since maximum height has been obtained. Diameter growth averages 0.04 inches per year in normal old-growth trees but will fluctuate with changes in the surrounding environment. Growth plots in natural California young-growth stands indicate stand yields of 629 board feet per acre mean annual increment at age 86. Planted European stands 76 to 122 years old have shown yields of between 285 and 601...

Logging roads are an important source of forestry-related erosion. The amount of erosion on a forest road is determined by the interaction between how the road is constructed and maintained and the environment in which it is built. The roads in this study were constructed with large bulldozers, and most excavated material was sidecast. The roads studied were constructed primarily for trucks transporting logs. They averaged 11.5 years old. Available running surface averaged 5 m wide, ranging from 3 m to 9 m. About 68% of the roads were surfaced with crushed rock, 15% were unsurfaced, and...

Giant sequoias (Sequoiadendron giganteum [Lindl.] Buchholz) are susceptible to a number of diseases and insects at each state of development from seeds to overmature trees. We presently have little more than a catalog of occurrences. The impacts and the management implications of disease and insect losses have scarcely been investigated or evaluated, and much study is needed to provide data for sound management and protection of giant sequoia stands.

Ancient ancestors of the giant sequoia (Sequoiadendron giganteum [Lindl.] Buchholz) were widespread throughout much of the Northern Hemisphere during the late Mesozoic Period. Climatic conditions changed, forcing the more recent ancestors of present giant sequoia into the southwestern United States. The native range is now restricted to the west slope of the Sierra Nevada. Although seen in 1833 the effective date of discovery by the Europeans was 1852. Soon after that specimen trees were cut, and then extensive logging removed about a third of the big trees. Preservation of groves started...

The critical path method (CPM) of network analysis (a) depicts precedence among the many activities in a project by a network diagram; (b) identifies critical activities by calculating their starting, finishing, and float times; and (c) displays possible schedules by constructing time charts. CPM was applied to the development of the Forest Service's Fire Economics Evaluation System (FEES)--a simulation model for evaluating fire program options. A computerized CPM package analyzed 47 activities, and produced basic schedules and labor required for each. One program in the package was used...

A computer simulation approach (DYNAST) was used to evaluate effects of three timber-management alternatives on wildlife in a 2700-ha (6700-acre) study area located in the Sierra Nevada, California. Wildlife species selected to evaluate the effects of these alternatives were band-tailed pigeon (Columba fusciutu), pileated woodpecker (Dryocopus pileatus), and mule deer (Odocoileus hemionus). Pileated woodpeckers responded most positively to the long-rotation alternative. Responses by band-tailed pigeons and mule deer indicated that either the mixed-rotation or optimal-timber alternative...

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