Treesearch

This is an assessment of the social and economic conditions in the Chugach National Forest area for use as background information for forest planning. Current regional conditions and recent trends are compared and contrasted with state and national conditions and recent trends. Regional employment and income trends in industries that use forest-related resources are detailed with a focus on their relation to forest management. Tourism and recreation is the industry likely to be most influenced by forest management policies. The social and economic conditions in 14 communities, chosen...

The magnitude and direction of water transport by the roots of eight dominant Brazilian savanna (Cerrado) allowed bidirectional measurements of sap flow. The patterns of sap flow observed during the dry season in species with dimorphic roots systems were consistent with the occurrence of hydraulic redistribution of soil water, the movement of water from moist to drier regions of the soil profile via plants roots. In these species, shallow roots exhibited positive sap flow (from the soil into the plant) during the day and negative sap flow (from the plant into the soil) during the night....

This bibliography focuses on the links between social system well-being and ecosystem health. It is intended for public land managers and scientists and students of social and natural sciences. Multidisciplinary science that addresses the interconnections between the social system and the ecosystem is presented. Some of the themes and strategies presented are policy and management processes, ecosystem management, conceptual approaches, sociocultural processes, ethics, economic perspectives and analysis, methods and indicators for assessment, and environment-human interactions. This...

Plant genomes vary over several orders of magnitude in size, even among closely related species, yet the origin, genesis and significance of this variation are not clear. Because DNA content varies over a sevenfold range among diploid species in the cotton genus (Gossypium) and its allies, this group offers opportunities for exploring patterns and mechanisms of genome size evolution. For example, the question has been raised whether plant genomes have a ‘one-way ticket to genomic obesity’, as a consequence of retroelement accumulation. Few empirical studies directly address this possibility...

Previous molecular phylogenetic studies have failed to resolve the branching order among the major cotton (Gossypium) lineages, and it has been unclear whether this reflects actual history (rapid radiation) or sampling properties of the genes evaluated. In this paper, we reconsider the phylogenetic relationships of diploid cotton genome groups using DNA sequences from 11 single-copy nuclear loci (10 293 base pairs [bp]), nuclear ribosomal DNA (695 bp), and four chloroplast loci (7370 bp). Results from individual loci and combined nuclear and chloroplast DNA partitions reveal that the...

This study projects the effects of tariff elimination on the world sector. Projections were done for two scenarios: (1) progressive tariff elimination according to the schedule agreed to under the current General Agreement on Tariff or Trade (GATT) and (2) complete elimination of tariff on wood products as proposed within the Asia-Pacific Economic Cooperation (APEC) Accelerated Tariff Liberalization (ATL) initiative. Projections were made by using the global forest products model, which provides equilibrium projections of prices and quantities produced, consumed, and traded for 14 commodity...

Three studies were analyzed this year that examined genetic aspects of Swiss needle cast (SNC) tolerance . Families sampled across the Siuslaw National forest showed differences in foliage health traits, but very little of the variation could be explained by environmental or climatic conditions at the parent tree location. Five test sites of the Nehalem series of progeny trials were measured for DBH. The best families were continuing to have reasonable basal area increments, implying that genetic improvement can produce stock that could offset the 30% volume growth reduction predicted in...

Animal locations estimated from radiotelemetry have traditionally been treated as error-free when analyzed in relation to habitat variables. Location error lowers the power of statistical tests of habitat selection. We describe a method that incorporates the error surrounding point estimates into measures of environmental variables determined from a geographic information system. We estimated a bivariate ellipsoidal probability density for errors surrounding radio collars placed at 20 random sites. This probability density of errors was used to construct probability-weighted estimates of...

Devices releasing antiaggregation pheromones, such as MCH (3-methyl-2-cyclohexen-1-one) and verbenone (4-methylene-6,6-dimethylbicyclo(3.1.1)hept-2-ene), are used experimentally to manipulate destructive populations of bark beetles. Two slow release devices, bubble caps attached to boles of trees and granular beads placed on the ground, were tested in forests of California, Oregon, and Alaska to determine their release rates. The hypothesis was that ambient air and soil temperatures were major determinants in the release rates of the releaser devices. Release rates of both bubble caps and...

This study provides a comprehensive and inclusive description and inventory of the vegetation within the Stikine area of southeast Alaska. Private and other public lands were included as well as Tongass National Forest lands contained in the Petersburg and Wrangell Ranger Districts. Previous inventories have concentrated almost exclusively on tree species within forest lands. There has been recent recognition, however, that forest management plans must incorporate detailed information on other vegetation and resources. During an information needs assessment, prior to the inventory, Tongass...