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Displaying 691 - 695 of 1605What controls the spatial patterns of the riverine carbonate system? — A case study for North America
In this study we analyzed the large scale spatial patterns of river pH, alkalinity, and CO₂ partial pressure (PCO₂) in North America and their relation to river catchment properties. The goal was to set up empirical equations which can predict these hydrochemical properties for non-monitored river stretches from geodata of e.g. terrain attributes, lithology, soils, land cover and climate. For an extensive dataset of 1120 river water sampling locations average values of river water pH, alkalinity and PCO₂ were calculated.
Evaluating the relative impact of climate and economic changes on forest and agricultural ecosystem services in mountain regions
Provisioning of ecosystem services (ES) in mountainous regions is predicted to be influenced by i) the direct biophysical impacts of climate change, ii) climate mediated land use change, and iii) socioeconomic driven changes in land use. The relative importance and the spatial distribution of these factors on forest and agricultural derived ES, however, is unclear, making the implementation of ES management schemes difficult.
influence of litter quality and micro-habitat on litter decomposition and soil properties in a silvopasture system
Studies to understand litter processes and soil properties are useful for maintaining pastureland productivity as animal husbandry is the dominant occupation in the hot arid region. We aimed to quantify how micro-habitats and combinations of litters of the introduced leguminous tree Colophospermum mopane with the grasses Cenchrus ciliaris or Lasiurus sindicus influence decomposition rate and soil nutrient changes in a hot desert silvopasture system.
Simulated effects of reduced spring flow from the Edwards Aquifer on population size of the fountain darter (Etheostoma fonticola)
The Edwards Aquifer in south-central Texas, U.S.A. is recognized worldwide for its aquatic species of flora and fauna, many of which are endangered or threatened, and also is the sole water source supporting the industrial, agricultural, municipal, and recreational needs of nearly 2 million people. Because it is generally the first species affected by low spring flows, the endangered fountain darter (Etheostoma fonticola) has been a focal point for controversies involving the endangered species act, state of Texas groundwater law, and private property rights.
evaluation of the effectiveness of a direct payment for biodiversity conservation: The Bird Nest Protection Program in the Northern Plains of Cambodia
Direct payments for the protection of biodiversity (a type of payment for environmental services) have been proposed as an effective tool for delivering conservation outcomes, in a way that also delivers development benefits to local people. Using an impact evaluation framework, this paper analyses the effectiveness of a direct payment program that was established for nine globally threatened bird species in the Northern Plains of Cambodia.