Unexpectedly deep roots in plants unearth new questions about soil carbon storage

A continental scale analysis reveals widespread root bimodality

An improved understanding of root vertical distribution is crucial for assessing plant-soil-atmosphere interactions and their influence on the land carbon sink. Here, we analyze a continental-scale dataset of fine roots reaching 2 meters depth, spanning from Alaskan tundra to Puerto Rican forests. Contrary to the expectation that fine root abundance decays exponentially with depth, we found root bimodality at ~20% of 44 sites, with secondary bio…

Unexpectedly deep roots in plants unearth new questions about soil carbon storage

Plants and trees extend their roots into the earth in order to draw nutrients and water from the soil—however, these roots are thought to decline as they move deeper underground. But a new study by a multi-institutional team of scientists shows that many plants develop a second, deeper layer of roots—often more than three feet underground—to access additional nourishment.