Global ecological predictors of the soil priming effect

TitleGlobal ecological predictors of the soil priming effect
Publication TypeJournal Article
Year of Publication2019
AuthorsBastida F., Bastidal F., Garcia C., Fierer N., Eldridge D.J, Bowker M.A, Abades S., Alfaro F.D, Berhe A.A, Cutler N.A, Gallardo A., Garcia-Velazquez L., Hart S.C, Hayese P.E, Hernandez T., Hseu Z.Y, Jehmlich N., Kirchmair M., Lambers H., Neuhauser S., Pena-Ramirez V.M, Perez C.A, Reed S.C, Santos F., Siebe C., Sullivan B.W, Trivedi P., Vera A., Williams M.A, Moreno J.L, Delgado-Baquerizo M.
JournalNature Communications
Date PublishedAug
Type of ArticleArticle
ISBN Number2041-1723
Accession NumberWOS:000478576500013
Keywordscarbon use efficiency, climate, community, decomposition, ecosystem multifunctionality, labile carbon, microbial diversity drives, nitrogen, organic-matter, phosphorus, Science & Technology - Other Topics

Identifying the global drivers of soil priming is essential to understanding C cycling in terrestrial ecosystems. We conducted a survey of soils across 86 globally-distributed locations, spanning a wide range of climates, biotic communities, and soil conditions, and evaluated the apparent soil priming effect using C-13-glucose labeling. Here we show that the magnitude of the positive apparent priming effect (increase in CO2 release through accelerated microbial biomass turnover) was negatively associated with SOC content and microbial respiration rates. Our statistical modeling suggests that apparent priming effects tend to be negative in more mesic sites associated with higher SOC contents. In contrast, a single-input of labile C causes positive apparent priming effects in more arid locations with low SOC contents. Our results provide solid evidence that SOC content plays a critical role in regulating apparent priming effects, with important implications for the improvement of C cycling models under global change scenarios.

Short TitleNat. Commun.Nat. Commun.
Alternate JournalNat. Commun.