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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
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Ehleringer, James R. | Fuentes de aqua utilizadas por las plantas desérticas y su importancia en planes de manejo y restauración ecológica | El agua es el factor más importante que afecta a la productividad primaria y la estructura de la vegetación en ecosistemas áridos. Dado que las especies de plantas pueden diferir en sus capacidades de utilizar distintas fuentes de agua, el conocimiento de estos aspectos es fundamental para los ... | Fuentes de agua; Isótopos estables; 8-H; 5 l sO; Zonas áridas; Plantas desérticas; Relaciones hídricas; Restauración ecológica; Desierto de Atacama; Atacama Desert; Stable isotopes; Water sources; Arid regions; Ecological restoration; Water relations; Water supplies | 2000 |
| 2 |
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Ehleringer, James R. | Interspecific competition and resource pulse utilization in a cold desert community | In desert ecosystems a large proportion of water and nitrogen is supplied in rain-induced pulses. It has been suggested that competitive interactions among desert plants would be most intense during these pulse periods of high resource availability. We tested this hypothesis with three cold desert s... | Atriplex confertifolia; Chrysothamnus nauseosus; Colorado Plateau; desert; Gutierrezia sarothrae; Neighbor removal; Plant competition; Resource pulses; Pulse utilization; Stable isotopes; Water uptake | 2002 |
| 3 |
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Ehleringer, James R. | Sourcing drugs with stable isotopes | Carbon (δ13C) and nitrogen (δ15N) isotope ratios at natural abundance levels are useful tools in determining the region-of-origin for both cocaine and heroin. Here we show that cocaine originating from different geographic regions of South America exhibited pronounced differences in their δ13C a... | Stable isotopes; Drug sourcing; Region-of-origin signature; Isotope ratio analysis | 2001 |
| 4 |
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Ehleringer, James R. | Tracing changes in ecosystem function under elevated carbon dioxide conditions | Responses of ecosystems to elevated levels of atmospheric carbon dioxide (CO2) remain a critical uncertainty in global change research. Two key unknown factors are the fate of carbon newly incorporated by photosynthesis into various pools within the ecosystem and the extent to which elevated CO2 is... | Elevated carbon dioxide; Stable isotopes; Radiocarbon; Global change; Terrestrial ecosystems | 2003 |
| 5 |
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Ehleringer, James R. | Water and nitrogen uptake patterns following moisture pulses in a cold desert community | Variation in the ability to utilize pulses of both water and nitrogen (N) is one possible mechanism allowing the coexistence of species in the cold desert community on the Colorado Plateau. We simulated 25-mm precipitation events and used stable isotope tracers (2H and 15N) to follow water and N upt... | Colorado Plateau; Desert perennials; Nitrogen uptake patterns; Pulse utilization; Resource partitioning; Stable isotopes; Water uptake patterns | 2000 |
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