Optimal sustainable harvest models for a Nigerian tropical rain forest

Article Abstract:

A tree population growth matrix provides models of sustainable harvest for a Nigerian rain forest. Between 50 and 80% of the marketable trees will be retained with a cutting cycle of 36 and 54 years. This indicates that the present over-exploitation of the wood resource of the rain forest is 20% to 50%. Non-selective logging causes a reduction in diameter limits and increase in quantities of trees for logging. The logging costs are more and damage of the trees is less in selective logging but it is vice versa in non-selective logging.

Nigeria, Sustainable development, Rain forests, Harvesting

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The failure of existing plans to protect salmon habitat in the Clearwater National Forest in Idaho

Article Abstract:

The analysis of the habitat condition of four salmon watersheds in the Clearwater National Forest indicate similar patterns of timber development and associated impacts to salmon habitat. Existing management plans for the watersheds failed mainly because more emphasis was given to selecting a method for developing any site than to the overall impact to the entire watershed and stream systems. Suggested management actions and strategies necessary to protect the salmon habitat are presented.

Analysis, Road construction, Sedimentation analysis, Watershed management

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Environmentally sensitive plot-scale timber harvesting: impacts on suspended sediment, bedload and bank erosion dynamics

Article Abstract:

Research on the environmental impacts of logging in a catchment area show significant increases in bank erosion rates, which comprise as much as 80% of total suspended sediment. Little change, however, was found for bedload yields. Research was conducted on the Afon Tanllwyth catchment in Plynlimon, United Kingdom. Implications for policy making are also discussed.

United Kingdom, Statistical Data Included, Forest management, Environmental policy research, Erosion, Sediment, Suspended, Suspended sediment

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