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Displaying 1296 - 1300 of 1605

How do butterflies define ecosystems? A comparison of ecological regionalization schemes

Journal Articles & Books
December, 2011

Ecological regionalizations, such as ecoregions or environmental clusters, are often used as coarse filters for conservation. To be effective biodiversity surrogates, regionalizations should contain distinct species assemblages. This condition is not frequently evaluated and regionalizations are rarely assessed comparatively.

Reducing contention amongst organisations dealing with commercially valuable but invasive plants: The case of buffel grass

Journal Articles & Books
December, 2011
Australia

Policy development can fail when organisations tasked with managing contentious species for different outcomes are at odds. Buffel grass (Cenchrus ciliaris L. syn. Pennisetum ciliare L. Link) has been planted worldwide and is a valuable pasture grass but it is contentious because of its environmental impacts. Due to this contention, government agencies in Australia have been reticent about developing policy for sustainable management of buffel grass.

Spatial fields' dispersion as a farmer strategy to reduce agro-climatic risk at the household level in pearl millet-based systems in the Sahel: A modeling perspective

Journal Articles & Books
December, 2011

The rainfall pattern in the Sahel is very erratic with a high spatial variability. We tested the often reported hypothesis that the dispersion of farmers' fields around the village territory helps mitigate agro-climatic risk by increasing yield stability from year to year. We also wished to evaluate whether this strategy had an effect on the yield disparity among households in a village. Based on a network of approximately 60 rain gauges spread over 500km² in the Fakara region (Southwest Niger), daily rainfall was interpolated at 300m×300m resolution over a 12-year period.

Impacts of land use and plant characteristics on dried soil layers in different climatic regions on the Loess Plateau of China

Journal Articles & Books
December, 2011
China

A dried soil layer (DSL) formed in the soil profile is a typical indication of soil drought caused by climate change and/or poor land management. The responses of a soil to drought conditions in water-limited systems and the impacts of plant characteristics on these processes are seldom known due to the lack of comparative data on soil water content (SWC) in the soil profile. The occurrence of DSLs can interfere in the water cycle in soil–plant–atmosphere systems by preventing water interchanges between upper soil layers and groundwater.

typology of graziers to inform a more targeted approach for developing natural resource management policies and agricultural extension programs

Journal Articles & Books
December, 2011
Australia

The use of landholder typologies to assist in the development of natural resource management (NRM) policies and agricultural extension programs has increased considerably in the past decade. In this paper we explore the potential of developing a typology of graziers to more effectively tailor policies and programs with the aim of improving land management outcomes.