Colombia
Carbon Sequestration in Pastures, Silvo-Pastoral Systems and Forests in Four Regions of the Latin American Tropicsbackground77% of agricultural land in the tropical Americas is used for pasture (including silvo-pasture and Argo-silvo-pasture), making carbon stocks in this land type an important consideration. This paper presents three-year research results on the evaluation of soil carbon stocks (SCS) in long-established pasture and silvo-pastoral systems (10-16 years under commercial production), native forests and degraded land in four regions of tropical Americas. Available with subscription or purchase |
Ecosystem Decay of Amazonian Forest Fragments: A 22-year InvestigationbackgroundThe authors discuss results from the Biological Dynamics of Forest Fragments Project, a long-term study on rainforest fragmentation in Amazonia. The project, which was originally intended to assess the influence of fragmented areas on Amazonia biota, took place in Menus, Brazil. This report surveyed 340 publications and theses that were produced over the 22 years of the project. Open access copy available |
Land Cover Change in Colombia: Surprising Forest Recovery Trends between 2001 and 2010backgroundThis study mapped annual land-use and land-cover from 2001 to 2010 in Colombia using MODIS (250 m) products coupled with reference data from high spatial resolution imagery (QuickBird) in Google Earth. Research Goals & MethodsThe authors evaluated land cover change at four spatial scales: country, biome, ecoregion, and municipality. Open access copy available |
Forest Cover and Deforestation Patterns in the Northern Andes (Lake Maracaibo Basin): A Synoptic Assessment using MODIS and Landsat ImageryBackgroundSouth America has the highest deforestation rates in the tropics. Yet, the science is often questioned when determining these rates. For example, Venezuela, which has the second highest rate in the region, produces government reports on deforestation that are continually questioned by third parties. This paper stresses the need for more accurate and consistent data on forest cover and greenhouse gase emissions from deforestation. Available with subscription or purchase |
Intensive Silvopastoral Systems: Improving Sustainability and Efficiency in Cattle Ranching LandscapesBackgroundThe article summarizes productivity benefits from implementation of intensive silvo-pastoral systems (ISPS) in Colombia, Mexico and Brazil, including benefits for the well-being of cattle, heightened biodiversity, and decreased area needed for production (allowing for greater quantities of forest area). The authors also summarize challenges inhibting greater adoption of intensive silvo-pastoral systems, and potential policy solutions for overcoming these challenges. Open access copy available |
Identifying Hotspots of Deforestation and Reforestation in Colombia (2001–2010): Implications for Protected AreasbackgroundThis article uses satellite imagery, MODIS MOD13Q1 Vegetation Indices 250 , the Virtual Interpretation of EarthWeb-Interface Tool (VIEW-IT) to conduct a land-use analysis of Colombia, mapping trends and "hotspot" areas of deforestation and of reforestation from 2001 to 2010. Research Goals & MethodsThe authors identify four hotspots of deforestation (clustered particularly in lowlands in the north of the country) and four of reforestation, mainly in the Andes highlands. Open access copy available |
The Savannization of Moist Forests in the Sierra Nevada de Santa Marta, ColombiaBackgroundThis study in the Sierra Nevada de Santa Marta seeks to determine if savannas are natural or caused by anthropogenic factors. The authors use climate data from the past and present, the location of vegetation, and land use history to test their hypothesis. Available with subscription or purchase |
The Role of Silvopastoral Systems in the Rehabilitation of Andean Stream HabitatsbackgroundThis article discusses the prevalence and impact of cattle grazing in the Andean region of Colombia. It asserts that ranching drastically alters the oxygen demand of and pH of streams, increases algae growth, and reduces light penetration. Ranching also damages stream flow and riverbanks, leading to higher erosion and run-off. Grasslands on previously forested areas have led to compaction of soil so that there is less infiltration leading to more run-off, floods due to increased speeds and volume, and less water in the streams during the dry season. Open access copy available |
Neotropical Secondary Forest Succession: Changes in Structural and Functional CharacteristicsBackgroundThis paper reiviews the main biotic and abiotic factors that influence patterns of secondary forest succession in the Neotropics after complete forest clearance due to human activities. Research Goals & MethodsThe authors look at patterns of species replacement and various processes that occur during succession and suggest that the sequence of processes may be predictable even if species composition is not. Open access copy available |
Rio Bogota - Fundacion al verde vivoThis project attempts to restore riparian forest along the headwaters of the Rio Bogota, upstream of the city of Bogota. Since 2003, the Fundacion al verde vivo has worked with volunteers to plant trees along the riparian corridor. Many areas along the riverbanks were previously used for cattle pasture, leather tanneries, or other small constructions. Local laws require that certain distances of riparian buffer are maintained as forest, but these regulations are rarely enforced. Plantings are conducted in rows with 1-2 meter spacing. Alnus plantings from 2005 form a canopy, and mid-successional species of oak, Spanish cedar, and other highland Andean trees are planted in gaps and in the understory. Full resource not available online |
