The priming effect of organic matter: a question of microbial competition?

Fontaine, Sébastien; Mariotti, André; Abbadie, Luc

doi:10.1016/s0038-0717(03)00123-8

Cited by 1,441 publications

(974 citation statements)

References 54 publications

Supporting

Mentioning

897

Contrasting

Unclassified

Order By: Relevance

“…However, whether changes in litter decomposition will ultimately impact downstream soil-C dynamics is uncertain (Kemmitt et al, 2008;Schimel and Schaeffer, 2012;Cleveland et al, 2014). Priming, the increased loss of soil-C due to the addition of labile substrates, has also been related to changes in microbial community structure (Fontaine et al, 2003;De Graaff et al, 2010;Blagodatskaya et al, 2014), and provides a link between the quantity or quality of more thermodynamically labile inputs and the potential destabilization of soil carbon (Guenet et al, 2012;Wild et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…We hypothesized that the addition of both litters would result in a greater release of soil-C relative to the no litter control (positive priming), but that the more thermodynamically stable litter would produce a stronger priming effect due to its greater chemical similarity to the soil (e.g. Fontaine et al, 2003). Finally, we hypothesized that differing microbial communities degrading the same source of soil-derived C would alter the response of soil-C mineralization (and assimilation) to temperature due to observed impacts of microbial community structure upon the response to warming (e.g.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microbial community structure mediates response of soil C decomposition to litter addition and warming

Creamer

Menezes

Krull

et al. 2015

Soil Biology and Biochemistry

205

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microbial community structure mediates response of soil C decomposition to litter addition and warming

Creamer

Menezes

Krull

et al. 2015

Soil Biology and Biochemistry

205

View full text Add to dashboard Cite

“…This accounts for the priming effect, i.e. the stimulation of soil organic matter mineralization after organic matter input to soil (Fontaine et al, 2003).…”

Section: Impact Of Atrazine and Earthworms On Microbial Respirationmentioning

confidence: 99%

Lumbricid macrofauna alter atrazine mineralization and sorption in a silt loam soil

Binet

Kersanté

Munier-Lamy

et al. 2006

Soil Biology and Biochemistry

View full text Add to dashboard Cite

Atrazine is a widely used herbicide and is often a contaminant in terrestrial and freshwater ecosystems. It is uncertain, however, how the activity of soil macrofauna affects atrazine fate and transport. Therefore, we investigated whether earthworms enhance atrazine biodegradation by stimulating herbicide degrading soil microflora, or if they increase atrazine persistence by facilitating herbicide sorption. Short (43 d) and medium term (86 d) effects of the earthworms Lumbricus terrestris and Aporrectodea caliginosa on mineralization, distribution, and sorption of Uring-14 C atrazine and on soil C mineralization was quantified in packed-soil microcosms using silt loam soil. A priming effect (stimulation of soil C mineralization) caused by atrazine supply was shown that likely lowered the earthworm net effect on soil C mineralization in atrazine-treated soil microcosms. Although earthworms significantly increased soil microbial activity, they reduced atrazine mineralization to 14 CO 2 -C from15.2 to 11.7% at 86 d. Earthworms facilitated formation of non-extractable atrazine residues within C-rich soil microsites that they created by burrowing and ingesting soil and organic matter. Atrazine sorption was highest in their gut contents and higher in casts than in burrow linings. Also, gut contents exhibited the highest formation of bound atrazine residues (non-extractable atrazine). Earthworms also promoted a deeper and patchier distribution of atrazine in the soil. This contributed to greater leaching losses of atrazine in microcosms amended with earthworms (3%) than in earthworm-free microcosms (0.003%), although these differences were not significant due to high variability in transport from earthwormamended microcosms. Our results indicated that earthworms, mainly by casting activity, facilitated atrazine sorption, which increased atrazine persistence. As a consequence, this effect overrode any increase in atrazine biodegradation due to stimulation of microbial activity by earthworms. It is concluded that the affect of earthworms of atrazine mineralization is time-dependent, mineralization being slightly enhanced in the short term and subsequently reduced in the medium term.

show abstract

“…A forte relação inversa entre os teores de COAM e os de COP (Tabela 5) indica que o aporte de matéria orgânica lábil ao solo pode promover a degradação de parte da matéria orgânica já estabilizada, em razão do efeito "priming" (Dalenberg & Jager, 1989;Fontaine et al, 2003). Esse fenômeno de degradação de matéria orgânica estável, quando do aporte de matéria orgânica fresca, já foi relatado em vários estudos (Bell et al, 2003;Fontaine et al, 2007).…”

Section: Resultsunclassified

“…Entretanto, as causas para a ocorrência do efeito são diversas (Kuzyakov et al, 2000;Fontaine et al, 2003). Cabe ressaltar, entretanto, que o SPD de hortaliças resultou em forte incremento do C orgânico no solo, conforme mostrado anteriormente, e que solos com cultivo de hortaliças recebem forte aporte de adubos nitrogenados, o que também pode ser uma explicação para a ocorrência do efeito "priming".…”

Section: Resultsunclassified

Compartimentos de carbono orgânico em Latossolo cultivado com hortaliças sob diferentes manejos

Lima

Fontenelle

Madeira

et al. 2016

Pesq. agropec. bras.

View full text Add to dashboard Cite

Resumo -O objetivo deste trabalho foi avaliar os teores de carbono orgânico total (COT) e das frações granulométricas da matéria orgânica de um Latossolo Vermelho cultivado com hortaliças, sob diferentes sistemas de manejo e de cultivo de plantas de cobertura. O experimento foi realizado por seis anos, em delineamento de blocos ao caso, em arranjo fatorial 3x2, com três sistemas de manejo do solo -plantio direto (SPD), preparo reduzido (PPR) e preparo convencional (SPC) -e dois cultivos de cobertura, um de milho solteiro e outro de milho consorciado com mucuna-cinza (Stizolobium niveum) (MM), com quatro repetições. Os teores de COT, estimados para a camada 0,00-0,30 m, foram maiores em SPD e PPR. Independentemente da profundidade avaliada, o consórcio MM promoveu os maiores teores de carbono orgânico particulado (COP), que foram fortemente influenciados pela incorporação da palhada. Em todas as camadas, observaramse correlações negativas entre os teores de COP e os de carbono orgânico associado a minerais (COAM), indício de ocorrência do efeito "priming". Os teores de COT correlacionaram-se positivamente aos de COAM, o que destaca a importância de mecanismos de estabilização da matéria orgânica no incremento dos teores de COT no solo.Termos para indexação: carbono associado a minerais, carbono orgânico particulado, carbono orgânico total, efeito "priming", plantio direto de hortaliças, sequestro de carbono. Organic carbon pools in an Oxisol cultivated with vegetables under different managementsAbstract -The objective of this work was to evaluate the contents of total organic carbon (COT) and of the organic matter fractions in an Oxisol cultivated with vegetables under different soil management systems and with different cover crops. The experiment was carried out for six years in a randomized block design, in a 3x2 factorial arrangement with three soil management systems -no-tillage (SPD), minimum tillage (PPR), and conventional system (SPC) -, and two cover crops, one of maize and the other of maize intercropped with Stizolobium niveum (MM), with four replicates. COT levels, estimated for 0.00-0.30-m, soil depth were higher in SPD and PPR. Regardless of the evaluated soil depth, MM intercropped system promoted higher contents of particulate organic carbon (COP), which were strongly affected by straw incorporation. In all soil depths, negative correlations were observed between the contents of COP and those of carbon associated to minerals (COAM), which indicate the occurrence of priming effect. COT contents were positively correlated to those of COAM, stressing the importance of soil organic matter stabilization mechanisms for improving COT contents in the soil.Index terms: carbon associated to minerals, particulate organic carbon, total organic carbon, priming effect, no-tillage for vegetables, carbon sequestration. IntroduçãoPara que ocorra sequestro de carbono, os sistemas de manejo devem adicionar elevadas quantidades de biomassa ao solo, causar o mínimo distúrbio em sua estrutura, além de promover a conser...

show abstract

The priming effect of organic matter: a question of microbial competition?

Cited by 1,441 publications

References 54 publications

Microbial community structure mediates response of soil C decomposition to litter addition and warming

Microbial community structure mediates response of soil C decomposition to litter addition and warming

Lumbricid macrofauna alter atrazine mineralization and sorption in a silt loam soil

Compartimentos de carbono orgânico em Latossolo cultivado com hortaliças sob diferentes manejos

Contact Info

Product

Resources

About