Search Results - "Polley, H.W"

Climate Impacts on Agriculture: Implications for Forage and Rangeland Production by Izaurralde, R.C, Thomson, A.M, Morgan, J.A, Fay, P.A, Polley, H.W, Hatfield, J.L

“…Projections of temperature and precipitation patterns across the United States during the next 50 yr anticipate a 1.5 to 2°C warming and a slight increase in…”
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Water relations in grassland and desert ecosystems exposed to elevated atmospheric CO2 by Morgan, J.A, Pataki, D.E, Korner, C, Clark, H, Del Grosso, S.J, Grunzweig, J.M, Knapp, A.K, Mosier, A.R, Newton, P.C.D, Niklaus, P.A, Nippert, J.B, Nowak, R.S, Parton, W.J, Polley, H.W, Shaw, M.R

“…Atmospheric CO2 enrichment may stimulate plant growth directly through (1) enhanced photosynthesis or indirectly, through (2) reduced plant water consumption…”
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Patterns of Plant Species Diversity in Remnant and Restored Tallgrass Prairies by Polley, H.W, Derner, J.D, Wilsey, B.J

“…To restore diversity of native vegetation, we must understand factors responsible for diversity in targeted communities. These factors operate at different…”
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Realistically low species evenness does not alter grassland species-richness-productivity relationships by Wilsey, Brian J., Polley, H. Wayne

“…Biodiversity is declining worldwide from reductions in both species richness and evenness. Field experiments have shown that primary productivity is often…”
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Initial response of evapotranspiration from tallgrass prairie vegetation to CO₂ at subambient to elevated concentrations by Polley, H. W., Johnson, H. B., Fay, P. A., Sanabria, J.

“…1. Effects of CO₂ enrichment on leaf transpiration are well-documented, but our understanding of how CO₂ interacts with other variables to regulate…”
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Do species evenness and plant density influence the magnitude of selection and complementarity effects in annual plant species mixtures? by Polley, H.W, Wilsey, B.J, Derner, J.D

“…Plant species richness influences primary productivity via mechanisms that (1) favour species with particular traits (selection effect) and (2) promote niche…”
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Woody invasion of grasslands: evidence that CO2 enrichment indirectly promotes establishment of Prosopis glandulosa by Polley, H.W, Johnson, H.B, Tischler, C.R

“…Grasslands worldwide have been invaded by woody species during the last 200 years. Atmospheric CO2 enrichment may indirectly have facilitated invasion by…”
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Viewpoint: atmospheric CO₂, soil water, and shrub/grass ratios on rangelands by Polley, H.W, Mayeux, H.S, Johnson, H.B, Tischler, C.R

“…The abundance of woody plants on grasslands and savannas often is controlled by the availability of water and its location in soil. Water availability to…”
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Increase in C3 plant water-use efficiency and biomass over Glacial to present CO₂ concentrations by Polley, H.W, Johnson, H.B, Marino, B.D, Mayeux, H.S

“…Atmospheric CO₂ concentration was 160 to 200 micromole mol-1 during the Last Glacial Maximum (LGM; about 18,000 years ago), rose to about 275 micromole mol-1…”
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C₃-C₄ composition and prior carbon dioxide treatment regulate the response of grassland carbon and water fluxes to carbon dioxide by POLLEY, H.W, DUGAS, W.A, MIELNICK, P.C, JOHNSON, H.B

“…Plants usually respond to carbon dioxide (CO2) enrichment by increasing photosynthesis and reducing transpiration, but these initial responses to CO2 may not…”
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Potential nitrogen constraints on soil carbon sequestration under low and elevated atmospheric CO by Gill, R.A, Anderson, L.J, Polley, H.W, Johnson, H.B, Jackson, R.B

“…The interaction between nitrogen cycling and carbon sequestration is critical in predicting the consequences of anthropogenic increases in atmospheric CO2…”
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Increasing CO2: comparative responses of the C4 grass Schizachyrium and grassland invader Prosopis by Polley, H. Wayne, Johnson, Hyrum B., Mayeux, Herman S.

“…The woody C"3 Prosopis glandulosa (honey mesquite) and C"4 perennial grass Schizachyrium scoparium (little bluestem) were grown along a gradient of daytime…”
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Growth, water relations, and survival of drought-exposed seedlings from six maternal families of honey mesquite (Prosopis glandulosa): responses to CO₂ enrichment by Polley, H.W, Tischler, C.R, Johnson, H.B, Pennington, R.E

“…Low water availability is a leading contributor to mortality of woody seedlings on grasslands, including those of the invasive shrub Prosopis. Increasing…”
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Seedling Growth of Two Honey Mesquite Varieties Under CO2 Enrichment by Derner, Justin D., Tischler, Charles R., Polley, H. Wayne, Johnson, Hyrum B.

“…Seedlings of 2 varieties of honey mesquite (Prosopis glandulosa var. glandulosa and P. glandulosa var. torreyana) were exposed to 2 concentrations of…”
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Root system response of C₄ grass seedlings to CO₂ and soil water by Derner, J.D., Polley, H.W., Johnson, H.B., Tischler, C.R.

“…Aboveground growth of C₄plants responds more strongly to atmospheric CO₂ concentration when soil water is limiting rather than abundant. Whether the same is…”
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Genetic variation for carbon isotope composition in honey mesquite (Prosopis glandulosa) by Pennington, R.E, Tischler, C.R, Johnson, H.B, Polley, H.W

“…Carbon isotope composition (delta(13)C) is a useful surrogate for integrated, plant water-use efficiency (WUE) when measured on plants grown in a common…”
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Leaf physiology, production, water use, and nitrogen dynamics of the grassland invader Acacia smallii at elevated CO2 concentrations by Polley, H.W, Johnson, H.B, Mayeux, H.S

“…Invasion by woody legumes can alter hydrology, nutrient accumulation and cycling, and carbon sequestration on grasslands. The rate and magnitude of these…”
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Stomatal density and aperture length in four plant species grown across a subambient CO2 gradient by Malone, S.R, Mayeux, H.S, Johnson, H.B, Polley, H.W

“…Stomatal density, stomatal aperture length, area/leaf, and number of stomata/leaf were measured after the annual C3 agronomic grasses oats (Avena sativa) and…”
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Links between transpiration and plant nitrogen: variation with atmospheric CO₂ concentration and nitrogen availability by Polley, H.W, Johnson, H.B, Tischler, C.R, Torbert, H.A

“…Transpiration is closely linked to plant nitrogen (N) content, indicating that global or other changes that alter plant N accumulation or the relative…”
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Carbon dioxide enrichment improves growth, water relations and survival of droughted honey mesquite (Prosopis glandulosa) seedlings by Polley, H.W, Johnson, H.B, Mayeux, H.S, Tischler, C.R, Brown, D.A

“…Low water availability reduces the establishment of the invasive shrub Prosopis on some grasslands. Water deficit survival and traits that may contribute to…”
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