Výsledky vyhledávání - "Graham J. Hymus"

NITROGEN CYCLING DURING SEVEN YEARS OF ATMOSPHERIC CO2ENRICHMENT IN A SCRUB OAK WOODLAND

Autor: Peter Stiling, Alisha L. Pagel, Bruce A. Hungate, Paul Dijkstra, Dale W. Johnson, Frank P. Day, J. Patrick Megonigal, Jiahong Li, Graham J. Hymus, C. Ross Hinkle, Jaina L. Moan, Bert G. Drake

Publikováno v: Ecology. 87:26-40

Experimentally increasing atmospheric CO2 often stimulates plant growth and ecosystem carbon (C) uptake. Biogeochemical theory predicts that these initial responses will immobilize nitrogen (N) in plant biomass and soil organic matter, causing N avai

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::219b9cedd738a02f7882170d1479a933
https://doi.org/10.1890/04-1732

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Differential effects of elevated CO2 on acorn density, weight, germination, and predation among three oak species in a scrub-oak forest

Autor: Bert G. Drake, Peter Stiling, Daniel C. Moon, Graham J. Hymus

Publikováno v: Global Change Biology. 10:228-232

Much research on the effects of elevated CO2 on forest trees has focused on quantitative changes in photosynthesis, secondary chemistry, and plant biomass. However, plant fitness responses to rising CO2 should also include quantitative measures of re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2f71f3ffa148a265fece703cd3b482b5
https://doi.org/10.1111/j.1365-2486.2004.00728.x

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Respiratory Oxygen Uptake Is Not Decreased by an Instantaneous Elevation of [CO2], But Is Increased with Long-Term Growth in the Field at Elevated [CO2]

Autor: Evan H. DeLucia, Bert G. Drake, David F. Karnosky, Stephen Hunt, Stephen P. Long, Graham J. Hymus, Phillip A. Davey

Publikováno v: Plant Physiology. 134:520-527

Averaged across many previous investigations, doubling the CO2 concentration ([CO2]) has frequently been reported to cause an instantaneous reduction of leaf dark respiration measured as CO2 efflux. No known mechanism accounts for this effect, and fo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c5266af9c16c7ef5ac391ee4cafeed61
https://doi.org/10.1104/pp.103.030569

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Effects of elevated atmospheric CO2 on net ecosystem CO2 exchange of a scrub-oak ecosystem

Autor: C. Ross Hinkle, Graham J. Hymus, Bert G. Drake, Sabina Dore, David P. Johnson, Hans P. Anderson

Publikováno v: Global Change Biology. 9:1802-1812

We report the results of a 2-year study of effects of the elevated (current ambient plus 350 μmol CO2 mol−1) atmospheric CO2 concentration (Ca) on net ecosystem CO2 exchange (NEE) of a scrub–oak ecosystem. The measurements were made in open-top

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d2c8144ce9f1c8895d9bdd7bdd1773c4
https://doi.org/10.1111/j.1365-2486.2003.00675.x

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THE EFFECTS OF ELEVATED CO2ON NUTRIENT DISTRIBUTION IN A FIRE-ADAPTED SCRUB OAK FOREST

Autor: Paul Dijkstra, C. R. Hinkle, Bert G. Drake, Graham J. Hymus, Bruce A. Hungate, Peter Stiling, Dale W. Johnson

Publikováno v: Ecological Applications. 13:1388-1399

Elevated carbon dioxide (CO2) caused greater accumulation of carbon (C) and nutrients in both vegetation and O horizons over a 5-yr sampling period in a scrub oak ecosystem in Florida. Elevated CO2 had no effect on any measured soil property except e

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::67ee8674e9f369031e0f0fe21250839c
https://doi.org/10.1890/02-5139

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Is stimulation of leaf photosynthesis by elevated carbon dioxide concentration maintained in the long term? A test with Lolium perenne grown for 10 years at two nitrogen fertilization levels under F ree A ir C O2 E nrichment (FACE)

Autor: P. A. Davey, Josef Nösberger, Stephen P. Long, Graham J. Hymus, Colin P. Osborne, Herbert Blum, Elizabeth A. Ainsworth, Alistair Rogers

Publikováno v: Plant, Cell & Environment. 26:705-714

Photosynthesis is commonly stimulated in grasslands with experimental increases in atmospheric CO 2 concentration ([CO 2 ]), a physiological response that could significantly alter the future carbon cycle if it persists in the long term. Yet an accli

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c97a251717f228aba47625084f6438f8
https://doi.org/10.1046/j.1365-3040.2003.01007.x

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Estimation of leaf area index using ground-based remote sensed NDVI measurements: validation and comparison with two indirect techniques

Autor: Jean-Yves Pontailler, Bert G. Drake, Graham J. Hymus

Publikováno v: Canadian Journal of Remote Sensing. 29:381-387

This study took place in an evergreen scrub oak ecosystem in Florida. Vegetation reflectance was measured in situ with a laboratory-made sensor in the red (640-665 nm) and near-infrared (750-950 nm) bands to calculate the normalized difference vegeta

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::72c39283adbbd720e1119e130dd9b389
https://doi.org/10.5589/m03-009

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Elevated CO 2 lowers relative and absolute herbivore density across all species of a scrub-oak forest

Autor: Mark D. Hunter, Bert G. Drake, Daniel C. Moon, Graham J. Hymus, Jamie Colson, Anthony M. Rossi, Peter Stiling

Publikováno v: Oecologia. 134:82-87

The unabated increase in global atmospheric CO(2) is expected to induce physiological changes in plants, including reduced foliar nitrogen, which are likely to affect herbivore densities. This study employs a field-based CO(2 )enrichment experiment a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d09ac89e4971c9d19dd938688d4c4bc1
https://doi.org/10.1007/s00442-002-1075-5

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