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Articles 1 - 5 of 5
Full-Text Articles in Life Sciences
Econometric Estimation Of Groundwater Depth Change For The High Plains Aquifer, Jonathan R. Sims
Econometric Estimation Of Groundwater Depth Change For The High Plains Aquifer, Jonathan R. Sims
Department of Agricultural Economics: Dissertations, Theses, and Student Research
This article presents a new method for estimating changes in depth to groundwater at a yearly, county level and incorporates these estimates as the dependent variable of econometric models for the High Plains aquifer. The High Plains (Ogallala) aquifer underlies eight states in the central United States and is the primary source of irrigation water for this large food producing region. The stock of groundwater is a finite, non-renewable resource with minimal recharge in most areas. Many fields of study, including hydrology and agricultural economics, are interested in depth to groundwater changes because they serve as a proxy for estimating …
Methodologies For Simulating Impacts Of Climate Change On Crop Production, Jeffrey W. White, Gerrit Hoogenboom, Bruce A. Kimball, Gerard W. Wall
Methodologies For Simulating Impacts Of Climate Change On Crop Production, Jeffrey W. White, Gerrit Hoogenboom, Bruce A. Kimball, Gerard W. Wall
United States Department of Agriculture-Agricultural Research Service / University of Nebraska-Lincoln: Faculty Publications
Ecophysiological models are widely used to forecast potential impacts of climate change on future agricultural productivity and to examine options for adaptation by local stakeholders and policy makers. However, protocols followed in such assessments vary to such an extent that they constrain cross-study syntheses and increase the potential for bias in projected impacts. We reviewed 221 peer-reviewed papers that used crop simulation models to examine diverse aspects of how climate change might affect agricultural systems. Six subject areas were examined: target crops and regions; the crop model(s) used and their characteristics; sources and application of data on [CO2] …
Time, Temperature And Species Interactions In A Duckweed-Herbivore Mesocosm, Ian Waterman
Time, Temperature And Species Interactions In A Duckweed-Herbivore Mesocosm, Ian Waterman
School of Biological Sciences: Dissertations, Theses, and Student Research
Species interactions within a community are impacted by a variety of abiotic factors. Temperature is known to alter population dynamics such that direct and indirect interactions between populations within a community are affected. Here I investigate the effect of temperature change on species interactions within a duckweed-herbivore mesocosm. Multiple communities were constructed, from a single population of duckweed, to two populations of duckweed consumed by aphids. In the one-predator two-prey web we predicted mutually positive indirect effects between duckweed populations during the first generation of growth. As aphid populations respond numerically to more abundant prey, mutually negative and asymmetric indirect …
G02-1451 Climate Change And Winter Wheat: What Can We Expect In The Future?, Albert Weiss, Cynthia J. Hays
G02-1451 Climate Change And Winter Wheat: What Can We Expect In The Future?, Albert Weiss, Cynthia J. Hays
University of Nebraska-Lincoln Extension: Historical Materials
This NebGuide will explain how climate changes at the end of this century will affect winter wheat production. Although it doesn't make daily headlines, global warming that results from climate changes will present challenges for current and future generations. While scientists may disagree about what causes current climate change, there is general agreement that a change is happening now and will continue for some time. As humans, it doesn't matter much whether the air temperature is 92 degrees or 97 degrees - either way we tend to be uncomfortable. However, a 5 degree temperature change can have dramatic implications for …
Nf98-382 Dealing With Change: Emotional Overload, Herbert G. Lingren
Nf98-382 Dealing With Change: Emotional Overload, Herbert G. Lingren
University of Nebraska-Lincoln Extension: Historical Materials
This NebFact discusses ways to cope with extreme stress and change.