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Displaying 486 - 490 of 1605Developing a complementary framework for urban ecology
Cities are characterized by dynamic interactions between socio-economic and biophysical forces. Currently more than half of the global population reside in cities which influence the global biogeochemical cycles and climate change, substantially exacerbating pressures on urban pollution, water quality and food security, as well as operating costs for infrastructure development. Goods and services such as aesthetic values, water purification, nutrient recycling, and biological diversity, that urban ecosystems generate for the society, are critical to sustain.
Runoff water quality from dryland cropping on Vertisols in Central Queensland, Australia
The effects of agricultural practices on runoff water quality are a major concern worldwide, particularly where there is the potential to cause harm to aquatic ecosystems receiving the runoff. Cropping land has been identified as a major source of pollutants in the Fitzroy Basin, the largest catchment discharging into the Great Barrier Reef (GBR) lagoon. However, knowledge of pollutant generation rates in runoff from the dryland cropping (grains) industry's best management practices (BMPs) on Vertisol soils is limited, partly due to the scarce distribution of these soils worldwide.
future of bioenergy and rural development policies in Africa and Asia
This special issue has presented some of the specific findings of the RE-Impact Project which was commissioned and funded by the EuropeAid Cooperation Office from 2007 until its conclusion in 2010. The project aimed to provide impact assessment frameworks and influence relevant policies through direct involvement in bioenergy projects and policy analysis in South Africa, Uganda, India and China. The papers summarised here have covered issues related to Jatropha curcas and forest-based bioenergy in these countries.
Factors influencing the use of alternative land cultivation technologies in Swaziland: Implications for smallholder farming on customary Swazi Nation Land
Poor land preparation and late planting are among the factors responsible for the decline in food production on customary Swazi Nation Land (SNL). While efforts are being made to develop an improved national land cultivation programme, this process can be helped by identifying factors that influence farmers to use alternative technologies for land cultivation. Using cross-section data collected in 2009 from a random sample of 210 farmers in Komati, three land cultivation technologies were identified; (i) use of tractors; (ii) use of draught animals; and (iii) use of hand hoes.
Soil water repellency in rangelands of Extremadura (Spain) and its relationship with land management
Soil water repellency reduces infiltration capacity, enhancing overland flow and even runoff production, and may produce patchiness in water infiltration at the hillslope scale. Knowledge about hydrophobicity in rangelands of Mediterranean type climate and its relation with vegetation cover and land management is sparse. The objectives of the present work are to determine the degree and spatial occurrence of soil water repellency and to define its relationship with site characteristics, such as soil, vegetation and land management in rangelands of SW Spain.