AI Article Synopsis
- Roots help build up carbon in the soil, but we don't know much about how this happens.
- We thought that trees with different types of fungi on their roots would store carbon differently, so we tested this in six forests.
- We found that trees with one type of fungus stored more carbon in the soil than those with another type, meaning the type of fungus on a tree's roots plays an important role in how much carbon gets stored in the ground!
Article Abstract
Roots promote the formation of slow-cycling soil carbon (C), yet we have a limited understanding of the magnitude and controls on this flux. We hypothesised arbuscular mycorrhizal (AM)- and ectomycorrhizal (ECM)-associated trees would exhibit differences in root-derived C accumulation in the soil, and that much of this C would be transferred into mineral-associated pools. We installed δ C-enriched ingrowth cores across mycorrhizal gradients in six Eastern U.S. forests (n = 54 plots). Overall, root-derived C was 54% greater in AM versus ECM-dominated plots. This resulted in nearly twice as much root-derived C in putatively slow-cycling mineral-associated pools in AM compared to ECM plots. Given that our estimates of root-derived inputs were often equal to or greater than leaf litter inputs, our results suggest that variation in root-derived soil C accumulation due to tree mycorrhizal dominance may be a key control of soil C dynamics in forests.
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| http://dx.doi.org/10.1111/ele.13651 | DOI Listing |
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