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Displaying 616 - 620 of 1605Mercury in European agricultural and grazing land soils
Agricultural (Ap, Aₚ-horizon, 0–20cm) and grazing land soil samples (Gr, 0–10cm) were collected from a large part of Europe (33 countries, 5.6million km²) at an average density of 1sample site/2500km². The resulting more than 2×2000 soil samples were air dried, sieved to
Integration of groundwater information into decision making for regional planning: A portrait for North America
Groundwater is widely used as a source of drinking water in North America. However, it can be contaminated by microbial or chemical agents potentially hazardous to human health. In recent decades, governments have developed better knowledge of groundwater and established measures to protect and preserve the resource. Several studies have shown that relevant information on groundwater might prove very useful for regional planning purposes.
Expansion to abandoned agricultural land forms an integral part of silver fir dynamics
Silver fir (Abies alba Mill.) is a tree species distributed mainly in central Europe. It once was a dominant tree species within some forests of this region. The causes for its rapid decline in the past two centuries have not yet been sufficiently explained. It is argued that human activities have been largely responsible for expansions and contractions of silver fir populations. On the basis of the current distribution of silver fir, historical maps and palaeoecological data, we describe the expansion of silver fir forests.
Incentives, land use, and ecosystem services: Synthesizing complex linkages
Incentive schemes are increasingly used to motivate the supply of ecosystem services from agro-ecosystems through changes in land use and management. Here, I synthesize the complex effects of incentives on ecosystem services through their influence on land use and management. Linkages between incentives and land use change, and between land use change and ecosystem services can be one-to-many, many-to-one, and many-to-many. Change in land use and management can affect multiple ecosystem services, with both co-benefits and trade-offs.
Assessing the role of policies on land use change and agricultural development since 1960s in northern Ethiopia
Policy has long been considered as one of the major driving forces for land use change and agricultural development. However, a designated and in-depth study on its interaction with land use change and agricultural development is still very limited. The authors, therefore, attempted to address this issue by using five villages representing three agro-ecologies (highland, midland and lowland) for the period between 1965 and 2007. The study indicated that land policies of the imperial and communist regimes contributed largely to the increase of arable land while a decrease in vegetated land.