Treesearch

The three-dimensional structure of the Santa Ana was investigated in two case studies. Incorporated into a descriptive model of the Santa Ana were: (a) a bispectral gravity wave flow with a lee trough, produced by conservation of potential vorticity having a wave length of the order of 300 km. and short waves 6 to 10 km. long; (b) intensity of the foehn related to the Montgomery stream function on an isentropic surface in the upper portion of the planetary boundary layer; and (c) foehn islands and foehn surfacing related to the long and short waves, respectively.

Hawaii has no native pines, but many species have been introduced as ornamental or potential timber trees. These species have been planted in environments that differ greatly from their natural habitat. This paper describes how the coordinated seasonal cycle of growth and flowering has been influenced by the climatic conditions these pines have encountered in Hawaii.

Describes the climatic, edaphic, physiographic, and biotic habitat conditions of the natural range of redwood (Sequoia sempervirens [D. Don] Endl.) and how this tree reproduces, grows, and dies.

Military support activities in Hawaii use between 50 and 150 thousand board feet of lumber annually for which locally grown and produced hardwood lumber might be used. In addition, the "other Pacific" market uses about 2 million board feet of hard-wood lumber annually. The Pacific Basin can be an important market for the Hawaii timber products industry because of the locational advantage it has compared with producers in the United States mainland.

In 1961, the cooperative watershed management research program in the Lower Conifer Zone of California was started. Research in the Lower Conifer Zone was designed to obtain information and develop principles to give greater insight into the effect of land management in the Zone upon water quality, floods and sedimentation, water timing, and water yield. The research was conducted by the Pacific Southwest Forest and Range Experiment Station of the U. S. Forest Service with the cooperation of the State of California, Department of Water Resources, and the Division of Forestry. In 1964, the...

A preliminary progress report of the research on the stream ecology of Caspar Creek by Humboldt State College was submitted by Dr. John DeWitt in December,1965, (DeWitt 1965). Further analyses of data collected during the summer of 1965 allows a more complete report to be made at this time. Although the contract was for the period July 1, 1965 to June 30, 1966, field work was started in June, 1965, and this work is included in this report. The 1965-1966 study program was designed to identify and to obtain preliminary measures of the more important variables which should be monitored in...

Five principal processes by which intercepted snow in trees is removed during snow storms are described and evaluated as far as data permit: vapor flux from melt water, vapor flux from bodies of snow, stem flow and dripping of melt water, sliding of bodies of intercepted snow from branches, and wind erosion and transport of intercepted snow. Further research is suggested to evaluate each mass-transport process and to determine how it is affected by atmospheric and forest conditions.

Studies of natural reproduction following logging under unit area control started in 1948 at the Stanislaus-Tuolumne Experimental Forest in California. Results from 119 permanent and 468 temporary quadrats show that when logging preceded a good seedfall, 67 percent of the total reproduction established in the first year remained after 12 years. With rodent control, 4 percent of the 1948 seedfall gave rise to new seedlings. Bare soil or light litter in semishade made good seedheds, but tolerance to sun and litter depth differed among species. Incense-cedar and white fir were the most common...