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Displaying 591 - 595 of 661Further down the road to sustainable environmental flows: funding, management activities and governance for six western US states
This article examines the voluntary approach to environmental flow management in six western states of the United States. These states use the legal system for water allocation known as prior appropriation which allows market transfers of water rights or leases to beneficial uses, here for instream flows. Funding sources are required to provide for market transfers to e-flows (environmental flows), and the present study indicates the inadequacy of support.
Gravel, Soil Organic Matter, and Texture in Fallowed Alfisols, Entisols and Ultisols: Implications for Root and Tuber Crops
Southwestern Nigeria is replete with soils that have high gravel contents within the subsoils. Most of these soils are being opened up for cultivation as other land uses (roads and housing) are competing for agricultural lands. It is imperative that these soils be properly studied and managed to prevent serious land degradation, which may over the long term militate against food production in most rural communities.
system dynamics model for evaluating collaborative forest management: a case study in Indonesia
This article presents a system dynamics (SD) method to examine the problem of forest degradation. The model developed takes a system-oriented view of forest management, embracing both social and biophysical factors affecting deforestation. Social factors examined are socio-economic variables or elements that influence behaviour and decision-making choices at the household level. Biophysical factors are four sub-components that are considered major land uses namely, the paddy field component, rattan plantations, coffee plantations and forest stands.
Water shortages and countermeasures for sustainable utilisation in the context of climate change in the Yellow River Delta region, China
With an increasing population and rapid development of the economy and society of the Yellow River Basin region, the Yellow River is at crisis point. The discrepancy between supply and demand of water resources is a key issue. In 2000–2006, the mean annual discharge of the Yellow River entering the delta was 13.2 billion m³, a reduction of 18.6 billion m³ compared with the 1980s, and 9 billion m³ less than in the 1990s. The water requirements of various sectors are increasing. Large amounts of water essential to maintain the health of the delta ecosystem have been diverted for other users.
integrated approach to assessing multiple stressors for coastal Lake Superior
Biological indicators can be used both to estimate ecological condition and to suggest plausible causes of ecosystem degradation across the U.S. Great Lakes coastal region. Here we use data on breeding bird, diatom, fish, invertebrate, and wetland plant communities to develop robust indicators of ecological condition of the U.S. Lake Superior coastal zone. Sites were selected as part of a larger, stratified random design for the entire U.S. Great Lakes coastal region, covering gradients of anthropogenic stress defined by over 200 stressor variables (e.g.