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Displaying 1336 - 1340 of 1605Effects of litigation under the Endangered Species Act on forest firm values
The Endangered Species Act (ESA) has been a source of litigation and subject to court interpretation during the past several decades. In this study, event analysis was employed to examine the impact of six court decisions related to the ESA on the financial performance of U.S. forest products firms. The finding of abnormal returns revealed that all six events generated the expected positive or negative returns, and among them, four were statistically significant. Changes in systematic risk reflected the reaction of the stock market to the verdict announcements.
Irrigation evaluation based on performance analysis and water accounting at the Bear River Irrigation Project (U.S.A.)
The purpose of this work is to contribute to the development of a combined approach to evaluate irrigated areas based on: (1) irrigation performance analysis intended to assess the productive impacts of irrigation practices and infrastructures, and (2) water accounting focused on the hydrological impacts of water use. Ador-Simulation, a combined model that simulates irrigation, water delivery, and crop growth and production was applied in a surface irrigated area (1213ha) located in the Bear River Irrigation Project, Utah, U.S.A..
Effects of land cover on runoff coefficient
Land cover is considered to have significant influence on the hydrologic response of a river basin. In this study, we assessed how changes in land cover over time affected flood behaviour from 1988 to 2005, in the Upper Ping River Basin, northern Thailand. We correlated the types of land cover with rainfall–runoff behaviour for smaller and larger flood events taking place during this period. To quantify land cover, nine Landsat 5 TM images taken during the dry season (January or February) were obtained and processed to examine inter-annual land cover changes.
Agricultural management affects earthworm and termite diversity across humid to semi-arid tropical zones
Earthworm and termite diversity were studied in 12 long-term agricultural field trials across the sub-humid to semi-arid tropical zones of Eastern and Western Africa. In each trial, treatments with high and low soil organic C were chosen to represent contrasts in long-term soil management effects, including tillage intensity, organic matter and nutrient management and crop rotations. For each trial, a fallow representing a relatively undisturbed reference was also sampled.
Environmental impacts from herbicide tolerant canola production in Western Canada
The commercial production of herbicide tolerant (HT) canola began in Western Canada in 1997. With more than a decade of use, the actual farm-level environmental impact of HT canola can be evaluated. This article reports on a spring 2007 survey of nearly 600 canola farmers in the three prairie provinces of Western Canada. Producers were asked about their crop production experiences for 2005 and 2006 and expected crop planting for 2007.