Items 11-20 of 611
Comparison of conventional eight-point crown projections with LIDAR-based virtual crown projections in a temperate old-growth forest
Sight-based field measurements of tree crown projection area and canopy height are common praxis in forest science but difficult to validate. We quantified their measurement errors based on the virtual representation of ...
Impacts of Land Abandonment on Vegetation: Successional Pathways in European Habitats
(Springer Netherlands, 2011)
Changes in traditional agricultural systems in Europe in recent decades have led to widespread abandonment and colonization of various habitats by shrubs and trees. We combined several vegetation databases to test whether ...
Atmospheric deposition, CO2, and change in the land carbon sink
Concentrations of atmospheric carbon dioxide (CO2) have continued to increase whereas atmospheric deposition of sulphur and nitrogen has declined in Europe and the USA during recent decades. Using time series of flux ...
Response of soil organic matter dynamics to conversion from tropical forest to grassland as determined by long-term incubation
Understanding soil organic carbon (SOC) responses to land-use changes requires knowledge of the sizes and mean residence times (MRT) of specific identifiable SOC pools over a range of decomposability. We examined pool sizes ...
Effectiveness of exclosures to control soil erosion and local community perception on soil erosion in Tigray, Ethiopia
The study investigated how effective exclosures are in the fight against soil erosion and how they are perceived as a means to control soil erosion by the local community (farmers and local experts). The universal soil ...
The Analysis of Association Between Traits When Differences Between Trait States Matter
(Springer Netherlands, 2011)
Because of their elementary significance in almost all fields of science, measures of association between two variables or traits are abundant and multiform. One aspect of association that is of considerable interest, ...
Stabilization of recent soil carbon in the humid tropics following land use changes: evidence from aggregate fractionation and stable isotope analyses
Keywords: Carbon sequestration - Ecuador - Mean residence time - Pasture - Secondary forest - Soil type - Texture - Water-stable aggregates
Evidence for hybridization and introgression within a species-rich oak (Quercus spp.) community
Background: Analysis of interspecific gene flow is crucial for the understanding of speciation processes and maintenance of species integrity. Oaks (genus Quercus, Fagaceae) are among the model species for the study of ...
Triangulation based inclusion probabilities: a design-unbiased sampling approach
(Springer US, 2011)
A probabilistic sampling approach for design-unbiased estimation of area-related quantitative characteristics of spatially dispersed population units is proposed. The developed field protocol includes a fixed number of 3 ...