Soil Health and Management
Deep Soil Moisture Storage and Transpiration in Forests and Pastures of Seasonally-Dry AmazoniabackgroundThis study, conducted in the seasonal rainforest of Northern Brazil (Para), compares re-growth of pasture, mature forest, and natural forest (capoeira). Goals & MethodsThe study assessed the impacts of land-use change on plant-available water (PAW) and evapotranspiration (ET). To do so, they measured volumetric water content (VWC) at 8 m below three nearby ecosystems over four years, including a mature evergreen forests, an adjacenet pasture, and a second-growth forest on abandoned pasture land. Available with subscription or purchase |
Soil carbon differences among forest, agriculture, and secondary vegetation in lower montane EcuadorBackgroundChanges in land use and land cover may affect soil properties and processes. Conversion of forest to cultivation is assumed to result in a decrease in soil nutrients. In the lower montane region of Ecuador, shifting cultivation patterns mean that forest clearing is occurring simultaneously with recolonization of secondary vegetation on abandoned agricultural lands. Open access copy available |
Amelioration of degraded rain forest soils by plantations of native treesbackgroundWhile much has been studied about the ability of tree growth to improve degraded soils in temperate zones, less is known about the impacts of tree growth on degraded soils in tropical zones. research goals & methodsThis study looks at the effects of trees planted in abandoned pasture land in northeastern Costa Rica, 25 years after that land had been cleared of rainforest. The soil was sampled before tree planting and 4 years after the trees became established. Available with subscription or purchase |
Nitrogen Dynamics of Actinorhizal Casuarina Forest Stands and its Comparison with Alnus and Leucaena ForestsBackgroundNitrogen plays a key role in soil fertility and plant productivity. Therefore, in regions in which deforestation has increasingly led to savannization and desertification, afforestation by fast-growing, n-fixing tree species is preferable. This study examines the characteristics of nitrogen fixing trees. Research Goals & MethodsThe nitrogen retention rates of three dry tropical forest tree species were measured, by examining rates of N cycling through vegetation, litter and soil pools. Available with subscription or purchase |
Effects of forest clearing and succession on the carbon and nitrogen content of soils in Puerto Rico and US Virgin IslandsBackgroundConversion of tropical forest lands to agriculture or pasture affects soil organic matter, moisture, and nutrients. This study examines the effects on soil carbon, nitrogen, and moisture at depths up to 100 cm of conversion from forest to agriculture and pasture. Available with subscription or purchase |
Soil macrofauna and litter nutrients in three tropical tree plantations on a disturbed site in Puerto RicoBackgroundTree plantations are increasingly common in tropical landscapes due to their multiple uses. Plantations vary in structure and composition, and these variations may alter soil fauna communities. Recent studies have demonstrated the important role of soil fauna in the regulation of plant litter decomposition in the tropics. However, little is known about how plantation species affect soil fauna populations, which may in turn affect the biogeochemistry of the plantation system. Open access copy available |
Tree species effects on soil properties in experimental plantations in tropical moist forestBackgroundForest soil properties are influenced by the complex interactions of vegetation, soil type, geology, management, and climactic patterns. Tree species can differ in their long-term effects on soils. This study resamples one of the earliest replicated experimental sites at La Selva Biological Station, Costa Rica, used to examine the effects of native tropical tree species on soil properties, to examine longer term effects on soil properties. Open access copy available |
Manual de recuperação de matas ciliares para produtores rurais (Manual of riparian forests recovery for rural producers)This technical manual targets farmers and “all those that perceive that the life of people is connected to the life of the forests, the animals, the earth and the rivers”. The guide contemplates many themes related to recovery of degraded areas, such as: the importance of riparian forests and other types of natural vegetation, technical aspects of the development and implementation of forest restoration activities, and useful tips for the implantation and maintenance of planted riparian areas. Open access copy available |
Vegetation recovery on earthquake-triggered landslide sites in the Ecuadorian AndesBackgroundIn this study, researchers surveyed vegetation in a landslide on the Quijos river in Ecuador and inventoried species distribution at distances along the landslide. Conclusions & TakeawaysThe authors found that species composition at the upper limit of the landslide is most similar to the plant composition of the forest, indicating that the forest is an important pool of colonizers. The authors suggest that earthquake landslides are common and an important contributor to floristic diversity Available with subscription or purchase |
Seed inputs to microsite patch recovery on two tropandean landslides in EcuadorBackgroundRegeneration of landslides is typically initiated by seed rain. This study reports on seed rain, seed pool, and plant cover on two Ecuadorian landslides. Open access copy available |
