The Effects of Forest Conversion on Annual Crops and Pastures: Estimates of Carbon Emissions and Plant Species Loss in a Brazilian Amazon Colony.

TitleThe Effects of Forest Conversion on Annual Crops and Pastures: Estimates of Carbon Emissions and Plant Species Loss in a Brazilian Amazon Colony.
Publication TypeJournal Article
Year of Publication1998
AuthorsFujisaka S, Castilla C, Escobar G, Rodrigues V, Veneklass EJ, Thomas R, Fisher M
ContactAuthorasb@cgiar.org
JournalAgriculture, Ecosystems and Environment
Volume69
Issue1
Pagination17-26
ISSN01678809
Keywordscalcium, Carbon Emissions, composition effects, doping (additives), high temperature superconductors, hole doping routes, lattice constants, oxide superconductors, oxygen, plant biodiversity, Slash-and-burn agriculture, superconducting transition temperature, superconductivity, synthesis (chemical), tropical deforestation
AbstractThe municipality of Theobroma in Rond nia, Brazil, covers 2165 km, of which 43% was deforested by 1993. Between 1973 and 1993, the national government continued to improve highway BR364 connecting the area to Brazil's south-central region and established a colony in Theobroma. During this period, 98% of the deforestation occurred. Some 1800 settler families continue to convert forest into pasture in a system based on slash-and-burn agriculture and dual-purpose cattle production. Trends in carbon emissions and plant species losses during the 20-year history of Theobroma were analysed by combining observed shifts in land use with estimates of the carbon stocks and plant species richness of each land use type. Carbon stocks declined from about 200 t ha-1 in the forest to 28 t ha-1 in the pasture and of 326 plant species encountered in the forest, only 20 remained in pastures (along with 66 species not found in forests). The effects of converting more than 93 000 ha of forest into other uses over 20 years include approximate losses of 14 million t of C to the atmosphere and substantial losses of plant species. Land use alternatives that would store more C include agroforestry and, given the strong incentives for settlers to convert lands into pasture, improving pasture management or developing silvopastoral systems.
URLhttp://www.sciencedirect.com/science/article/pii/S0167880998000917
DOI10.1016/S0167-8809(98)00091-7