From roots to shoots: the previously untapped carbon dioxide transport system | Forerunner Research

Forests represent the majority of terrestrial primary productivity, and therefore play an important role in global carbon budgets, however not much is known about internal CO2 efflux, from the tree roots through the xylem to the foliage. Researchers in Georgia (US) studied an experimental Populus deltoides plantation to determine how much carbon dioxide is transported from the roots, into the xylem and up into the leaves, compared to the efflux of carbon dioxide into the atmosphere from the soil.

Source: From roots to shoots: the previously untapped carbon dioxide transport system | Forerunner Research