Puerto Rico - United States
Patterns and controls on island-wide aboveground biomass accumulation in second-growth forests of Puerto RicoBackgroundSecondary or second-growth forests after land abandonment are a valuable contribution to global carbon sinks. Approximately 70% of the world’s tropical forests are secondary growth, so understanding the carbon sequestration rates on a large scale is important. Sequestration rates are controlled by both abiotic and biotic factors in each region. Open access copy available |
Aboveground carbon responses to experimental and natural hurricane impacts in a subtropical wet forest in Puerto RicoBackgroundCarbon sequestration is a major climate mitigating process. Tropical forests in particular sequester high amounts of carbon, however disturbance events such as storms can alter the ability of forests to sequester more carbon. Hurricanes create forest gaps and increase ground debris which both provide resources that may promote plant recruitment and growth. Open access copy available |
Restoration of Degraded Tropical Forest LandscapesBACKGROUNDForest loss and degradation negatively affect rural communities whose livelihoods are dependent on forests for ecological goods and services. To address the challenge, three solutions have been proposed, expanding networks of protected areas, improving agricultural productivity on abandoned lands and reforestation. Of the three, new approaches to restoration have shown to have the potential to address forest degradation and rural poverty. Available with subscription or purchase |
Factors Affecting Mortality and Resistance to Damage Following Hurricanes in a Rehabilitated Subtropical Moist ForestBackgroundThis study was conducted in the Luquillo Experimental Forest (LEF), which was previously abandoned pastureland reforested through mixed planting and natural regeneration. Available with subscription or purchase |
Shade-grown coffee in Puerto Rico: Opportunities to preserve biodiversity while reinvigorating a struggling agricultural commodityBackgroundCoffee has been a traditional crop in Puerto Rico since the mid-1700s. As the global market became more competitive in the 20th century, the Puerto Rican government provided subsidies and policies to protect the sector as well as promoted the transition to shade grown coffee for higher yields in the 1980s. The researchers surveyed 100 farms and 5 agronomists to determine attitudes about this transition. Open access copy available |
Using artificial canopy gaps to restore Puerto Rican Parrot (Amazona vittata) habitat in tropical timber plantationsBackgroundThis study tests whether or not man-made canopy gaps can restore native tree diversity as food sources for the endagered Puerto Rican Parrot (Amazona vittata). The site is located within a non-native blue mahoe (Hibiscus elatus) plantation in the Río Abajo forest in central Puerto Rico, where the researchers planted native species in assisted natural regeneration. The gaps were created in 20m x 20m plots by girdling and applying herbicide on non-native trees and by clearing leaf litter and vegetation, creating space for planted and naturally established advance regeneration seedlings. Available with subscription or purchase |
The role of species mixtures in plantation forestryBackgroundForest plantations are increasingly being established around the world, yet many are often monocultures. While the paper recognizes that all plantations are beneficial in terms of restoration, it specifically seeks to explore the advantages of mixed-species plantations. Available with subscription or purchase |
Bird Perches Increase Forest Seeds on Puerto Rican LandslidesBackgroundForest regeneration is typically difficult after landslides due to loss of above- and below-ground vegetative structure, the soil seed bank, soil nutrients, and soil structure. Landslides are a common occurrence in Puerto Rico due to its steep topography and heavy rainfall periods and often transform into grass- or fern-dominated terrain. Insufficient seed rain is thought to be one contributing factor. 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 |
Vegetation Structure, Species Diversity, and Ecosystem Processes as Measures of Restoration SuccessBackgroundThis article provides an example of how to evaluate forest restoration using integrative methods, including measures of vegetation structure, species diversity, and ecosystem processes. Specifically discussed are four measures of vegetation structure, four measures of species diversity, and six measures of ecosystem processes. Available with subscription or purchase |
