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Carbon and Oxygen Isotope Analysis of Leaf Biomass Reveals Contrasting Photosynthetic Responses to Elevated Co2 Near Geologic Vents in Yellowstone National Park
Author(s):Sharma, S.; Williams, David G.; Sharma, S.; Williams, David G.
In this study we explore the use of natural CO2 emissions in Yellowstone National Park (YNP) in Wyoming, USA to study responses of natural vegetation to elevated CO2 levels. Radiocarbon (14C) analysis of leaf biomass from ...
Daily to Decadal Patterns of Precipitation, Humidity, and Photosynthetic Physiology Recorded in the Spines of the Columnar Cactus, Carnegiea Gigantea
Author(s):English, N. B.; Dettman, D. L.; Sandquist, D. R.; Williams, David G.; English, N. B.; Dettman, D. L.; Sandquist, D. R.; Williams, David G.
Isotopic analyses of cactus spines grown serially from the apex of long-lived columnar cactuses may be useful for climatological and ecological studies if time series can be reliably determined from spines. To characterize ...
Shrub Encroachment Alters Sensitivity of Soil Respiration to Temperature and Moisture
Author(s):Cable, J. M.; Barron-Gafford, G. A.; Ogle, K.; Pavao-Zuckerman, M.; Scott, R. L.; Williams, David G.; Huxman, T. E.; Cable, J. M.; Barron-Gafford, G. A.; Ogle, K.; Pavao-Zuckerman, M.; Scott, R. L.; Williams, David G.; Huxman, T. E.
A greater abundance of shrubs in semiarid grasslands affects the spatial patterns of soil temperature, moisture, and litter, resulting in fertile islands with potentially enhanced soil metabolic activity. The goal of this ...