Carbon and oxygen stable isotope ratios of ponderosa pine, Big Cottonwood Canyon, Utah, USA.

Stable isotope ratios of carbon and oxygen, and mass percentage data of various components of ponderosa pine individuals in Big Cottonwood Canyon, Utah to accompany a manuscript published in Oecologia. <br><br>Two or three branches from five ponderosa pine individuals in Big Cottonwood Canyon, Utah were sampled in February, June, July, and September of 2019. Samples were processed to get mass percentages of sugars, starch, and cellulose in the branch and in needle segments. Needle values are presented in segments, with values for the bottom, middle, and top thirds of the needle. Carbon and oxygen stable isotope ratios were determined from ground bulk samples, as well as the sugar and cellulose fractions. Carbon isotope ratios are presented with respect to VPDB standard while oxygen isotope ratios are presented with respect to the VSMOW standard.