The priming effect generated by stoichiometric decomposition and nutrient mining in cultivated tropical soils: Actors and drivers

Razanamalala, Kanto; Fanomezana, Rota Andrea; Razafimbelo, Tantely; Chevallier, Tiphaine; Trap, Jean; Blanchart, Éric; Bernard, Lætitia

doi:10.1016/j.apsoil.2018.02.008

Cited by 36 publications

(34 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When simple sugars or fresh litter are added to soil under N limitation, positive priming appears to be due to a stimulation of slow-growing K-strategists who can decompose older existing organic matter with low C:N ratios for nutrients, resulting in microbial nutrient mining [136]. In contrast, when accompanied by N additions or when N is not limiting, fast-growing r-strategists drive the increase in decomposition of younger existing organic matter with higher C:N ratios, such as plant litter and cellulose, in a process known as stoichiometric decomposition [149]. Thus, in soils where microbial activity is not energy-limited, positive priming is driven by K-strategists when the C: N ratios of substrates do not match microbial needs, while positive priming is driven by r-strategists when the C:N ratio of new inputs is similar to that of existing organic matter and nutrients are not limiting.…”

Section: Primingmentioning

confidence: 99%

What do we know about soil carbon destabilization?

Bailey

Pries

Lajtha

2019

Environ. Res. Lett.

159

106

View full text Add to dashboard Cite

Most empirical and modeling research on soil carbon (C) dynamics has focused on those processes that control and promote C stabilization. However, we lack a strong, generalizable understanding of the mechanisms through which soil organic carbon (SOC) is destabilized in soils. Yet a clear understanding of C destabilization processes in soil is needed to quantify the feedbacks of the soil C cycle to the Earth system. Destabilization includes processes that occur along a spectrum through which SOC shifts from a ‘protected’ state to an ‘available’ state to microbial cells where it can be mineralized to gaseous forms or to soluble forms that are then lost from the soil system. These processes fall into three general categories: (1) release from physical occlusion through processes such as tillage, bioturbation, or freeze-thaw and wetting-drying cycles; (2) C desorption from soil solids and colloids; and (3) increased C metabolism. Many processes that stabilize soil C can also destabilize C, and C gain or loss depends on the balance between competing reactions. For example, earthworms may both destabilize C through aggregate destruction, but may also create new aggregates and redistribute C into mineral horizon. Similarly, mycorrhizae and roots form new soil C but may also destabilize old soil C through priming and promoting microbial mining; labile C inputs cause C stabilization through increased carbon use efficiency or may fuel priming. Changes to the soil environment that affect the solubility of minerals or change the relative surfaces charges of minerals can destabilize SOC, including increased pH or in the reductive dissolution of Fe-bearing minerals. By considering these different physical, chemical, and biological controls as processes that contribute to soil C destabilization, we can develop thoughtful new hypotheses about the persistence and vulnerability of C in soils and make more accurate and robust predictions of soil C cycling in a changing environment.

show abstract

Section: Primingmentioning

confidence: 99%

What do we know about soil carbon destabilization?

Bailey

Pries

Lajtha

2019

Environ. Res. Lett.

159

106

View full text Add to dashboard Cite

show abstract

“…Microorganisms (including archaea, bacteria, and fungi) play crucial roles in driving PE‐generation processes (Fontaine et al, 2011; Morrissey et al, 2017). It is generally accepted that positive PEs can be generated through two distinct microbial processes: stoichiometric decomposition and nutrient mining (Chen et al, 2014; Fontaine et al, 2004; Razanamalala et al, 2018). In the stoichiometric decomposition process, organic carbon mineralization is increased by collateral damage of redundant extracellular enzymes released by microbial decomposers in response to OM input, whereas in the nutrient mining process, organic carbon mineralization is enhanced by co‐metabolisms of two types of co‐occurring microbial populations (Blagodatskaya & Kuzyakov, 2008; Fontaine et al, 2003; Razanamalala et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…It is generally accepted that positive PEs can be generated through two distinct microbial processes: stoichiometric decomposition and nutrient mining (Chen et al, 2014; Fontaine et al, 2004; Razanamalala et al, 2018). In the stoichiometric decomposition process, organic carbon mineralization is increased by collateral damage of redundant extracellular enzymes released by microbial decomposers in response to OM input, whereas in the nutrient mining process, organic carbon mineralization is enhanced by co‐metabolisms of two types of co‐occurring microbial populations (Blagodatskaya & Kuzyakov, 2008; Fontaine et al, 2003; Razanamalala et al, 2018). Two co‐metabolism types are proposed to drive positive PEs: (1) in the presence of fresh OM, one microbial population can degrade extant recalcitrant OM resulting in intermediate products that are not usable for themselves but mineralizable for another microbial population; and (2) one microbial population utilizes fresh OM, resulting in catabolites that stimulate the growth of another microbial population capable of mining native OM as nutrients (e.g., nitrogen) (Guenet et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, microbial mechanisms for PEs have been intensively investigated in numerous studies, and a broad range of microbial populations were shown to drive positive PEs. For instance, several previous studies indicated that various bacterial (e.g., Proteobacteria ) and fungal (e.g., Ascomycota ) groups were potentially involved in positive PEs (Fan et al, 2019; Fang et al, 2018; Fontaine et al, 2011; Morrissey et al, 2017; Pascault et al, 2013; Razanamalala et al, 2018). However, it is poorly known which microbial populations engage in co‐metabolism and drive positive PEs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Deciphering Linkages Between Microbial Communities and Priming Effects in Lake Sediments With Different Salinity

et al. 2020

View full text Add to dashboard Cite

Priming effects (PEs) and their associated microbial drivers are not well studied in lake sediments. Here, we investigated PEs and underlying potential microbial drivers in the sediments of lakes on the Qinghai‐Tibetan Plateau (QTP). Sediments were collected from three QTP lakes with different salinity, followed by microcosm construction and subsequent incubation at in situ temperature. The sediment microcosms were amended with 13C‐labeled glucose, on which PE intensities were evaluated in the incubations on Days 7 and 42. Positive PEs were observed in all the studied lake sediment microcosms. PE intensities exhibited significantly (p < 0.05) linear correlations with most of the measured physicochemical factors (e.g., salinity, sediment total nitrogen/phosphorus, and ratios of carbon:nitrogen), and such linear correlations were inverse for the early (i.e., on Day 7) and late (i.e., on Day 42) PEs. Prokaryotic and fungal community compositions significantly changed owing to glucose addition in the studied lake microcosms, suggesting that both prokaryotes and fungi may contribute to the observed PEs. Network analysis showed that the numbers of positive correlations between fungal taxa and other microorganisms increased with the enhancement of the late PE intensity, suggesting that fungi and associated co‐metabolisms may play key roles in late PEs in this study. Collectively, this study gives new insights into PE intensity and underlying microbial drivers of PE in lake sediments, and such knowledge is of great importance to understanding organic matter mineralization in lake ecosystems.

show abstract

“…Most studies conducted up to now have investigated PEs with a single addition into soils of different labile trigger substrates, like glucose, malic acid, glycine or cellulose (e.g., Chowdhury et al, 2014;Fontaine et al, 2011;Liu et al, 2018;Whitaker et al, 2014) or have investigated the effect of incorporation of plant residues (e.g., Li et al, 2018;Razanamalala et al, 2018;Sauvadet et al, 2018). In addition, effects of mixtures of labile C and crop residues on PEs have been examined (Shahbaz et al, 2018).…”

mentioning

confidence: 99%

The microbial side of soil priming effects

Lonardo

View full text Add to dashboard Cite

The priming effect generated by stoichiometric decomposition and nutrient mining in cultivated tropical soils: Actors and drivers

Cited by 36 publications

References 38 publications

What do we know about soil carbon destabilization?

What do we know about soil carbon destabilization?

Deciphering Linkages Between Microbial Communities and Priming Effects in Lake Sediments With Different Salinity

The microbial side of soil priming effects

Contact Info

Product

Resources

About