2017
DOI: 10.1016/j.apsoil.2016.10.002
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Labile carbon input determines the direction and magnitude of the priming effect

Abstract: Labile carbon (C) input to soil can accelerate or slow the decomposition of soil organic matter, a phenomenon called priming. However, priming is difficult to predict, making its relationship with C input elusive. To assess this relationship, we added 13 C-glucose at five levels (8 to 1606 μg C g-1 soil week-1) to the soil from four different ecosystems for seven weeks. We observed a positive linear relationship between C input and priming in all soils: priming increased from negative or no priming at low C in… Show more

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Cited by 123 publications
(70 citation statements)
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“…The increased positive PE caused by the residue inputs was in the range reported in other studies by various LOM inputs (Chen et al., ; Dimassi et al., ). Furthermore, the positive PE was almost three times higher in the presence of a relatively high‐ vs. low‐residue input level, which is supported by previous reports about a positive relationship between the magnitude of positive PE and LOM input level (Liu et al., ; Paterson & Sim, ).…”
Section: Discussionsupporting
confidence: 87%
See 1 more Smart Citation
“…The increased positive PE caused by the residue inputs was in the range reported in other studies by various LOM inputs (Chen et al., ; Dimassi et al., ). Furthermore, the positive PE was almost three times higher in the presence of a relatively high‐ vs. low‐residue input level, which is supported by previous reports about a positive relationship between the magnitude of positive PE and LOM input level (Liu et al., ; Paterson & Sim, ).…”
Section: Discussionsupporting
confidence: 87%
“…Accelerated microbial activity with the input of labile organic matter (LOM), such as glucose and crop residues, may enhance SOC mineralization as a result of “co‐metabolism” and higher enzyme production (Blagodatskaya & Kuzyakov, ). The PE could be positively, if not linearly, related to the amount of LOM added to soil (Liu et al., ; Paterson & Sim, ). There could also be changes in the direction and magnitude of the PE on SOC mineralization by the input of residue‐derived LOM over time, for example, switching from a negative to a positive PE rate on native SOC, and increased (Wang et al., ) or decreased magnitude of positive PE rate (Nottingham, Turner, Chamberlain, Stott, & Tanner, ).…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, this unshielded hemicellulose may have provided microbial communities with an easily accessible C source and thereby stimulated the soil PE in the early stage of decomposition, until the unshielded portions were exhausted. In contrast, the concentration of tannins was negatively associated with the PE in the early decomposition stage, possibly resulting from the inhibitory effect of tannins on soil enzyme activity, thus impeding SOC mineralization (Chomel et al, ; Liu et al, ), before tannin compounds were further degraded by soil microbial communities in the later stage of decomposition (Joanisse, Bradley, Preston, & Munson, ; Makkonen et al, ; Ushio, Balser, & Kitayama, ).…”
Section: Discussionmentioning
confidence: 99%
“…Glucose and alanine are typical components of root exudates and fresh residue inputs that are easily utilized and lead to increased CO 2 production (Blagodatskaya et al, ; Kuzyakov & Cheng, ; Liu et al, ). In our study, the addition 0.4 mg C g −1 soil of glucose and alanine increased CO 2 production in all aggregate treatments.…”
Section: Discussionmentioning
confidence: 99%