Emergy Evaluation of Reforestation Alternatives in Puerto Rico
All alternatives generated net public benefit (emdollar yield ratios 4.2 to 24.3). The emdollar value of a closed canopy developed in 10 to 20 yr ranged from 20,000 to 48,000 em$ /ha, whereas the economic costs were $1200 to $9700. For complex forest development in 25 to 60 yr, values ranged from 63,000 to 118,000 em$ /ha, much higher than economic costs of $4000 to $12,000/ha. Highest public benefit per dollar cost came from succession (24.7 em$/$) and exotic colonization (19.1 em$/$). Highest potential monetary returns were from exotic spread (15.1 $/$) and plantations (17.9 and 14.5 $/$). Stand quality after 60 yr, as measured by the transformity (emergy/energy), was largest in mahogany plantation (6.4 × 10 4 sej/J) and succession forest (3.9 × 104 sej/J). FOR. SCI. 46(4):521–530.
Document Type: Miscellaneous
Affiliations: 1: Assistant Professor Centre for Sustainable Agriculture (CUL), Swedish University of Agricultural Science (SLU), Box 7047, SE-750 07 Uppsala Sweden, Phone: 4618671493 [email protected] 2: Research Hydrologist International Institute of Tropical Forestry, USDA Forest Service, P. O. Box 25000 Rio Piedras, Puerto Rico, 00928-5000, Phone: (787) 766-5335 [email protected] 3: 2208 Meadow Lane Dr., Easton, PA, 18040, [email protected]
Publication date: 2000-11-01
- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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