Treesearch

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...

In Japanese

The Vegetation Classification System for California is an unbiased system of defining and naming units of vegetation. The concept was devised by an interagency, interdisciplinary team (Paysen and others 1980, 1982). The system derives its uniqueness from its impartiality to any particular agency or resource discipline, thus providing a long-needed link between diverse classification methodologies. The user must meet only three system rules: to identify accurately (preferably by species) the herbs, shrubs, and trees of the classification site; to understand the concept of a plant community...