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Displaying 921 - 925 of 1605assessment of nonindustrial private forest landowner willingness to harvest woody biomass in support of bioenergy production in Mississippi: A contingent rating approach
The economic feasibility of utilizing woody biomass to produce biofuel lies in the willingness to harvest by non-industrial private forest (NIPF) landowners, who control 71% of forestland in the southern United States. A mail survey was distributed to NIPF landowners throughout Mississippi to elicit their preferences concerning the utilization of logging residues from harvesting operations to produce bioenergy.
Protected areas do not fulfil the wintering habitat needs of the trans-Saharan migratory Montagu’s harrier
Populations of migratory birds can be affected by events happening at both breeding and wintering grounds. The Sahel is a vast region holding a large number of wintering trans-Saharan migratory European birds, and current land-use changes there may represent a threat for these species. We used satellite tracking data from the migratory Montagu’s harrier to evaluate habitat use of the species during the wintering season, and whether the current network of protected areas is effective to provide their habitat needs during that season.
Can active restoration of tropical rainforest rescue biodiversity? A case with bird community indicators
There is vigorous debate about the potential for reforestation to offset losses in biodiversity associated with tropical deforestation, but a scarcity of good data. We quantified developmental trajectories following active restoration (replanting) of deforested pasture land to tropical Australian rainforest, using 20 different bird community indicators within chronosequences of multiple sites. Bird species composition in restored sites (1–24years old) was intermediate between that of reference sites in pasture and primary rainforest.
β-Glucosidase kinetic parameters as indicators of soil quality under conventional and organic cropping systems applying two analytical approaches
Soil enzymes are widely used as indicators of soil quality because they are sensitive to various land management practices. In particular, enzyme kinetic behaviour and the derived kinetic parameters (Vₘₐₓ and Kₘ) can be indirectly influenced by changes of soil structure, organic matter quantity and quality due to the addition of organic amendments to the soil. When measuring enzyme kinetics, the calculation of the specificity constant (Kₐ), i.e.: the ratio Vₘₐₓ to Kₘ, is advisable to obtain additional information on the whole catalytic process.
Objective classification of air quality monitoring sites over Europe
The observation sites that make up air quality monitoring networks can have very different characteristics (topography, climatology, distance to emission sources, etc), which are partially described in the meta-information provided with data sets. At the scale of Europe, the description of the sites depends on the institute(s) in charge of the air quality monitoring in each country, and is based on specific criteria that can be sometimes rather subjective.