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Displaying 1501 - 1505 of 1605

modified climate diagram displaying net water requirements of wetlands in arid and semi-arid regions

Journal Articles & Books
Dezembro, 2009
China

Flooding regimes in arid and semi-arid regions are heavily influenced by climate change and water shortage, water regulations, and increased water demands. Wetlands managed as part of regulated water systems in agricultural landscapes often require external water supplies to sustain or support desired properties or services. Therefore, water resource managers must weigh water requirements necessary to support wetland functions alongside other water demands.

Economic assessment of shade-cloth covers for agricultural irrigation reservoirs in a semi-arid climate

Journal Articles & Books
Dezembro, 2009
Espanha

We assess the economics of investing in suspended shade-cloth covers (SSCCs) in agricultural water reservoirs (AWRs) to reduce evaporation losses and save water for irrigation in arid and semi-arid areas. In particular, we examine the use of SSCCs in the Segura River Basin (southeastern Spain). The decision to install a cover depends on the potential evaporation losses, reservoir characteristics, cover effectiveness, the value of water, filtration requirements, water salinity, government subsidies and the installation, operation and maintenance costs.

Accountability of experts in the Danish national park process

Journal Articles & Books
Dezembro, 2009
Dinamarca

In 2002 the Danish Minister of Environment initiated a process to investigate the possibilities of establishing national parks in Denmark. For this purpose experts were mobilised to investigate the status and potentials of the areas in question. The national park process was extensive in scope and complex, and in theory such complexity is assumed to make it difficult for non-experts to understand all the relevant aspects of policy. This exclusion of non-experts may lead to scientification of politics.

Balancing the economic, social and environmental dimensions of agro-ecosystems: An integrated modeling approach

Journal Articles & Books
Dezembro, 2009

There is an increasing need to view agro-ecosystems and to identify remedial management practices in a holistic way. An integrated model based on the driving force-pressure-state-impact-response approach was developed as a tool to assess the effects of policies for improving decision making for the sustainability of agro-ecosystems. An economic model was linked to a process-based biophysical model by a meta-model. Then, a holistic indicator-based impact assessment system was linked to the integrated model to assess policy instruments.

Local knowledge and management of simpukng (forest gardens) among the Dayak people in East Kalimantan, Indonesia

Journal Articles & Books
Dezembro, 2009
Indonésia

Among the Dayak people in East Kalimantan, simpukng (“forest gardens”) are an important component of their traditional farming systems. Simpukng is managed secondary forests in which selected species of fruits, rattan, bamboo, timber and other plants are planted. While most are owned by families and passed down from one generation to the next, some are managed on a communal basis. Complex customary Dayak rules exist that control the use and inheritance of these forests that help to avoid over-exploitation of resources.