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Displaying 1046 - 1050 of 1195

Changing land use/cover patterns and implications for sustainable environmental management in the Irangi Hills, central Tanzania

Journal Articles & Books
Dezembro, 2010
Tanzania

This article examines the changes in land-use/cover types in the Irangi Hills, central Tanzania during the last 45 years and how such changes have influenced environmental and agricultural sustainability in the area. The spatial and temporal changes of land-use/cover were analysed through aerial photographs interpretation. Local perceptions and experiences of changes were addressed through household interviews and field observations.

multi-modeling approach to evaluating climate and land use change impacts in a Great Lakes River Basin

Journal Articles & Books
Dezembro, 2010

River ecosystems are driven by linked physical, chemical, and biological subsystems, which operate over different temporal and spatial domains. This complexity increases uncertainty in ecological forecasts, and impedes preparation for the ecological consequences of climate change. We describe a recently developed “multi-modeling” system for ecological forecasting in a 7600 km² watershed in the North American Great Lakes Basin.

Planned fires and invertebrate conservation in south east Australia

Journal Articles & Books
Dezembro, 2010
Austrália

Unusually intense wildfires in south east Australia in early February 2009 led to the deaths of 173 people in Victoria and massive loss of property, with several towns essentially obliterated. More than 450,000 ha were burned. The severity of those fires has led to calls for massively increased planned burning for fuel reduction, with a Government Enquiry (a Royal Commission) currently considering all aspects of the fires and future policy, to help safeguard life and property.

Effect of farmer management strategies on spatial variability of soil fertility and crop nutrient uptake in contrasting agro-ecological zones in Zimbabwe

Journal Articles & Books
Dezembro, 2010
Zimbabwe
África

Variability of soil fertility within, and across farms, poses a major challenge for increasing crop productivity in smallholder systems of sub-Saharan Africa. This study assessed the effect of farmers' resource endowment and nutrient management strategies on variability in soil fertility and plant nutrient uptake between different fields in Gokwe South (ave. rainfall ~650 mm year⁻¹; 16.3 persons km⁻²) and Murewa (ave. rainfall ~850 mm year⁻¹; 44.1 persons km⁻²) districts, Zimbabwe.

Will Limited Land, Water, and Energy Control Human Population Numbers in the Future

Journal Articles & Books
Dezembro, 2010

Nearly 60% of the world's human population is malnourished and the numbers are growing. Shortages of basic foods related to decreases in per capita cropland, water, and fossil energy resources contribute to spreading malnutrition and other diseases. The suggestion is that in the future only a smaller number of people will have access to adequate nourishment.