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Early- and later-stage priming effects induced by spruce root fractions are regulated by substrate availability, stoichiometry and C input
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SYSNO ASEP 0573916 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Early- and later-stage priming effects induced by spruce root fractions are regulated by substrate availability, stoichiometry and C input Tvůrce(i) Yang, Songyu (BC-A) RID, ORCID
Angst, Gerrit (BC-A) RID, ORCID
Jandová, Kateřina (UJF-V)
Kukla, J. (CZ)
Meador, Travis Blake (BC-A) ORCID, RID
Paterson, E. (GB)
Jílková, Veronika (BC-A) RID, ORCIDČíslo článku 116610 Zdroj.dok. Geoderma. - : Elsevier - ISSN 0016-7061
Roč. 437, September (2023)Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova carbon use efficiency ; K-strategist ; N-mining ; pool substitution ; r-strategist ; stoichiometric decomposition Vědní obor RIV DF - Pedologie Obor OECD Soil science Vědní obor RIV – spolupráce Ústav jaderné fyziky - Fyzikální chemie a teoretická chemie CEP EF18_053/0016982 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy GA22-02550S GA ČR - Grantová agentura ČR EF16_019/0000728 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Open access Institucionální podpora BC-A - RVO:60077344 ; UJF-V - RVO:61389005 UT WOS 001044027000001 EID SCOPUS 85164987748 DOI 10.1016/j.geoderma.2023.116610 Anotace The priming effect (PE), referring to the change in the soil organic carbon (SOC) turnover induced by fresh C input, is crucial to the SOC budget. Temperate coniferous forests store a large SOC pool that can be influenced by litter C input. Root litter is a major source of belowground C input but much less studied than leaf litter. Nowadays, it is not clear how PEs are controlled by root litter input of different availability and stoichiometry in coniferous forests and what the underlying mechanisms are. We prepared soluble fraction (SF) and insoluble fraction (IF) from 13C-depleted spruce roots using hot-water extraction and incubated these fractions with spruce forest soils (Cambisols) to measure the PE. Labile and slow C pools were simulated using a first-order parallel model, whereas soils were harvested during and after the incubation to estimate microbial utilization of substrate-C and C use efficiency (CUE). The SF had higher substrate availability, greater C:N ratio, and smaller C quantity than the IF. The PE ranged from −0.71 ± 0.44 to 3.34 ± 1.31 mg C/g SOC. The addition of SF induced an immediate and short-lasting positive PE, whereas that of IF caused a gradual and long-lasting positive PE. The immediate PE was associated with abundant, substrate-derived labile C. This indicates that the early-stage PE was controlled by substrate availability. The long-lasting PE was accompanied by an accelerated decomposition of the slow C pool, reflecting that substrate stoichiometry (C:N ratio) and total C input control the later-stage PE by regulating the decomposition of the slow C pool. This can be further explained by a shift between stoichiometric decomposition and N-mining mechanisms of the PE due to changes in CUE, microbial utilization of substrate-C, and K- vs. r-strategists with substrate C:N ratios. Regarding net C budget, a smaller C accumulation induced by the SF addition corresponded to the higher substrate availability and C:N ratio due to the greater early-stage PE and lower CUE, respectively. We propose that in our studied soils: (1) substrate availability determines the early-stage PE through substrate-derived labile C, (2) substrate stoichiometry and total C input regulate the later-stage PE through microbial utilization of substrates, and (3) both substrate availability and stoichiometry control net C budget. Our study highlighted that the shift in PEs with incubation time was regulated by substrate availability, stoichiometry, and C input at the level of the C input in natural spruce forests. Pracoviště Biologické centrum (od r. 2006) Kontakt Dana Hypšová, eje@eje.cz, Tel.: 387 775 214 Rok sběru 2024 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S0016706123002872?via%3Dihub
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