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- Plantations of multi-purpose tree species can play an important role in restoring productivity, ecosyste~ 2n stability, and biological diversity to degraded tropical lands. The present study, conducted at a degraded coastal pasture site in Puerto Rico, compares 4.5-year-old Aibizia lebbek (L.) Benth. plantation stands and adjacent control areas with respect to biomass production, understorey species diversity and nutrient storage patterns within vegetation, forest floor organic matter, and mineral soil compartments. Mineral soil (0-20 cm depth) organic carbon (OC) and total nitrogen (TN)...SourceAgriculture, Ecosystems and Environment, 41 I :15-133Year1992
- We investigate the relationship between immigration and internal labor movements in the US. Wedding the literatures on immigration and internal migration, we develop a mobility model linking these various flows on the basis of occupational status of worker, producction and institutional relations in the economy, and economic restructuring.AuthorsR. Walker, M. Ellis, R. BarffKeywordsSourceEconomic Geography. ; 68(3):234-248.Year1992
- AuthorsAriel LugoSourceWali, Mohan K., editor. Ecosystem rehabilitation: ecosystem analysis and synthesis. Hague, The Netherlands: SPB Academic Publishing; pp. 247-255Year1992
- AuthorsA. E. LugoSourceNew Orleans, LA: USDA Forest Service, Southern Forest Experiment Station, Institute of Tropical Forestry;. 86 p.Year1992
- KeywordsSourceNew Orleans, LA: USDA Forest Service, Southern Forest Experiment Station, Institute of Tropical Forestry; . 8 p. (SO-ITF-SM; 52).Year1992
- AuthorsJohn K. FrancisKeywordsSourceUSDA Forest Service, Southern Forest Experiment Station, Institute of Tropical Forestry;. 4 p. (SO-ITF-SM; 51).Year1992