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Significance Decomposition of plant roots and associated fungal mutualists is a dominant process in ecosystem carbon cycles, yet is woefully understudied compared with decomposition of leaf litter, particularly for the finest order roots that have the highest turnover. In a field experiment, we compared decomposition of the finest, most distal roots and leaf litter among 35 cooccurring temperate forest species over 6 years. We found that decomposition rates of root tips were considerably lower than those of leaf litter and were controlled by nonlignin carbon compounds in contrast to lignin:nitrogen ratio control over leaf litter decomposition. Our study suggests that models of terrestrial carbon cycling based on aboveground patterns are inadequate to describe decomposition of the finest plant roots.

Contrasting dynamics and trait controls in first-order root compared with leaf litter decomposition