Stable isotopes of carbon in cottonwood tree rings
![Stable isotopes of carbon in cottonwood tree rings provide a record of past drought stress](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/StableIsotopesCottonwood.jpg?itok=-0i-MQ68)
Detailed Description
Stable isotopes of carbon in cottonwood tree rings provide a record of past drought stress. This figure shows the strong negative correlation between annual September-August precipitation and the 13C/12C ratio of cottonwood rings averaged across seven trees from the flood plain of the Little Missouri River in Theodore Roosevelt National Park, ND (r = -0.60).