Root-derived inputs are major contributors to soil carbon in temperate forests, but vary by mycorrhizal type

Keller Adrienne B.; Brzostek Edward R.; Craig Matthew E.; Fisher Joshua B.; Phillips Richard P.

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Root-derived inputs are major contributors to soil carbon in temperate forests, but vary by mycorrhizal type

机译：根源的投入是温带森林中土壤碳的主要贡献者，但因菌根类型而异

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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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来源
《Ecology letters》 |2021年第4期|共10页
作者
Keller Adrienne B.; Brzostek Edward R.; Craig Matthew E.; Fisher Joshua B.; Phillips Richard P.;
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作者单位

Indiana Univ Dept Biol Bloomington IN 47405 USA;

West Virginia Univ Dept Biol Morgantown WV 26506 USA;

Oak Ridge Natl Lab Div Environm Sci POB 2008 Oak Ridge TN 37831 USA;

Univ Calif Los Angeles Jet Prop Lab Calif Inst Technol Joint Inst Reg Earth Syst Sci Los Angeles CA USA;

Indiana Univ Dept Biol Bloomington IN 47405 USA;

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原文格式 PDF
正文语种 eng
中图分类普通生物学;
关键词
Belowground carbon allocation; mycorrhizal association; rhizodeposition; root exudation;

机译：地下碳分配;菌根协会;无根状沉积;根出渗出;

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Root-derived inputs are major contributors to soil carbon in temperate forests, but vary by mycorrhizal type

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