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Displaying 946 - 950 of 1605Microbial enzyme stoichiometry and nutrient limitation in US streams and rivers
We analyzed water and sediment chemistry, catchment land cover, and microbial dehydrogenase (DHA) and extracellular enzymes activities (EEA) related to microbial C, N, P, and S acquisition in more than 2100 1st–10th order streams. The streams and their catchments represented gradients in water and sediment chemistry (C, N, P, S) and land cover (% forest, % wetland, % row crop agriculture) against which to compare biofilm and sediment DHA and EEA, and to estimate the extent of nutrient limitation in US streams and rivers.
Land use scenario development as a tool for watershed management within the Rio Mannu Basin
The Rio Mannu River Basin (Sardinia, Italy) is undergoing a process of agricultural intensification. Like many Mediterranean areas, this basin is characterized by water shortages and diffuse pollution from agricultural sources. Hence the objective of this study was to develop possible land use and land management scenarios that could constitute an alternative to the current watershed management.
Land, landlords and sustainable livelihoods: The impact of agrarian reform on a coconut hacienda in the Philippines
Agrarian reform has been a key theme on the development agenda of many countries in the Global South for decades. Whilst such interventions are often pursued for political goals and in the interests of empowerment, there is often a mismatch between these goals and the actual outcomes achieved. Within this context, this study investigates the impacts of agrarian reform in Del Rosario, a former coconut hacienda in the Philippines.
Monitoring desertification in a Savannah region in Sudan using Landsat images and spectral mixture analysis
Two Landsat images, acquired in 1987 and 2008, were analyzed to evaluate desertification processes in central North Kurdufan State (Sudan). Spectral Mixture Analysis (SMA) and multitemporal comparison techniques (change vector analysis) were applied to estimate the long-term desertification/re-growing of vegetation cover over time and in space. Site-specific interactions between natural processes and human activity played a pivotal role in desertification. Over the last 21 years, desertification significantly prevailed over vegetation re-growth, particularly in areas around rural villages.
Eliciting expert knowledge to inform landscape modeling of conservation scenarios
Conservation and land management organizations such as The Nature Conservancy are developing strategies to distribute conservation efforts over larger areas. Relative to fee-simple protection efforts, strategies that allow ecologically sustainable timber harvest and recreation activities, such as working forest conservation easements, should yield greater socioeconomic benefits (ecosystem services) with less investment per area without significantly compromising the conservation of biodiversity (ecological targets).