Treesearch

The watershed of the 'Indian Triangle' is formed by the flow of two mighty rivers which emanate from the Himalaya. The Ganges and teh Brahmaputra embrace the lands and the peoples of Nepal*, India* and Bangladesh* before emptying in the Bay of Bengal. A recent monsoon submerged two thirds of the low-lying Bangladesh rendering 23 million people homeless. can the future of these people be secured by lowering the water levels downstream? Are there alternative structural propositions and are they economically and politically feasible? What effect will the excessive removal of natural barriers...

In 1989 the Western International Forest Disease Work Conference and the Western Forest Insect Work Conference met jointly in Bend, Oregon, during the week of September 11-15, 1989. One of the 90-minute, concurrent workshops scheduled during this period was a discussion of the biology and present and future control strategies of wood-destroying organisms. This subject area has not traditionally been of concern to these two organizations, either as it might relate to protection of wood in use or to the degradation of wood in a forest environment. It was felt that many of the professionals...

Forest vegetation, especially tree roots, helps stabilize hillslopes by reinforcing soil shear strength. To evaluate the effect of tree roots on slope stability, information about the amount of roots and their strength should be known. A simulation model for the root distribution of Cryptomeria japonica was proposed where the number of roots in each 0.5-cm diameter class can be calculated at arbitrary depths. The pull-out strength of roots was used to analyze the stability of four different types of forested slopes. Root reinforcement is important on slopes where roots can extend into...

Some possible factors causing enhanced litter decomposition in high-pollution sites in the San Bernardino Mountains of southern California were investigated. Nitrogen concentration of soil, as well as foliage and litter of ponderosa pine (Pinus ponderosa Laws.) and Jeffrey pine (Pinus jeffreyi Grev. & Balf.) were greater in high-pollution plots than in moderate- or low-pollution plots. Nitrogen concentration of soil, foliage, and litter of ponderosa pine (ozone-sensitive), and of the ozone-tolerant species, sugar pine (Pinus lambertiana Dougl.) and incense cedar (Calocedms decurrens...

The proceedings contains 11 the 17 papers presented at the technical session on geometric hazards in managed forests at the XIX World Congress, International Union of Forestry Research Organizations, August 5-11, 1990, Montreal, Canada, plus one paper not presented orally. Two papers report research on torrents, two are about snow, three concern landslides, and five discuss watershed management problems.