Annual Variation of Carbon Stable Isotope Ratio in Tree Rings of Riparian Cottonwood Over the Last 225 Years.

Jonathan M Friedman, US Geological Survey, Fort Collins Science Center, Fort Collins, United States, Craig A Stricker, USGS, Baltimore, MD, United States, Adam Z Csank, University of Nevada Reno, Department of Geography, Reno, United States and Honghua Zhou, Xinjiang institute of Ecology and Geography, Chinese Avademy of Sciences, Urumqi, China