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Displaying 586 - 590 of 1605Assessment of groundwater vulnerability to nonpoint source pollution in a Mediterranean coastal zone (Mersin, Turkey) under conflicting land use practices
Groundwater resources of the Tarsus coastal plain (Mersin, Turkey) are being exploited heavily for a variety of purposes and they are under a serious threat from nonpoint source pollution from the conflicting land use practices and saltwater intrusion due to overpumping. In this study, vulnerability of groundwater to nonpoint source pollution was assessed using GIS techniques and employing both Generic and Pesticide DRASTIC models. Calculated vulnerability indices ranged between 68–206 and 69–236 for Generic and Pesticide DRASTIC, respectively.
Recreational boaters' perceptions of scenic value in Rhode Island coastal waters
Scenic value has long been recognized as an important feature in land use planning and management. In the US, several states have included scenic value provisions in their coastal zone legislation and required that reviews of project proposals consider scenic or aesthetic effects. In Rhode Island, all permitting decisions must take into account the effect of a proposed activity in the coastal zone, such as a new dock or expanded aquaculture facility, on scenic or aesthetic value. However, there is limited guidance for how the terms scenic value or aesthetic value should be interpreted.
Mapping global land system archetypes
Land use is a key driver of global environmental change. Unless major shifts in consumptive behaviours occur, land-based production will have to increase drastically to meet future demands for food and other commodities. One approach to better understand the drivers and impacts of agricultural intensification is the identification of global, archetypical patterns of land systems. Current approaches focus on broad-scale representations of dominant land cover with limited consideration of land-use intensity.
Assessing the differences in net primary productivity between pre- and post-urban land development in China
Urban land development substantially alters the terrestrial carbon cycle, particularly the net primary productivity (NPP), from local to global scales. However, limited attempts have been undertaken to elucidate the differences in NPP between pre- and post-urban land development in China. In this paper, the terrestrial NPP after urbanization in China was assessed by using the Carnegie-Ames-Stanford approach (CASA), toward which a calibration was conducted for adapting this model on the fine-scale application.
Using algal metrics and biomass to evaluate multiple ways of defining concentration-based nutrient criteria in streams and their ecological relevance
We examined the utility of nutrient criteria derived solely from total phosphorus (TP) concentrations in streams (regression models and percentile distributions) and evaluated their ecological relevance to diatom and algal biomass responses. We used a variety of statistics to characterize ecological responses and to develop concentration-based nutrient criteria (derived from ecological effects) for streams in Connecticut, USA, where urbanization is the primary cause of watershed alteration.