期刊
ECOLOGY LETTERS
卷 24, 期 4, 页码 626-635出版社
WILEY
DOI: 10.1111/ele.13651
关键词
Belowground carbon allocation; mycorrhizal association; rhizodeposition; root exudation
类别
资金
- U.S. Department of Energy Office of Biological and Environmental Research, Terrestrial Ecosystem Science Program [DESC0016188]
- Center for Tropical Forest Science - ForestGEO
- United States Department of Agriculture, National Institute of Food and Agriculture [2019-67011-29507]
- U.S. Department of Energy [DE-AC05-00O R2 2725]
In the study of six Eastern U.S. forests, it was found that root-derived carbon accumulation was 54% greater in arbuscular mycorrhizal trees compared to ectomycorrhizal trees; as a result, nearly twice as much root-derived carbon was present in putatively slow-cycling mineral-associated pools in arbuscular mycorrhizal trees compared to ectomycorrhizal trees. The study suggests that variations in root-derived soil carbon accumulation due to tree mycorrhizal dominance may play a key role in controlling soil carbon dynamics in forests.
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 delta C-13-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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