Priming effects: Interactions between living and dead organic matter

Kuzyakov, Yakov

doi:10.1016/j.soilbio.2010.04.003

Cited by 1,591 publications

(995 citation statements)

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“…Andrews DIRT site (Oregon, USA) soil C concentrations were not increased (Crow et al, 2009), and even after two decades of doubled litter inputs, the Harvard Forest and Bousson sites did not display increases in soil C. At all of these sites, soil CO 2 production is elevated in response to litter additions (Bowden et al, 1993;Sulzman et al, 2005; unpublished data) thus reducing the amount of organic matter that might enter the soil C pool. A priming effect (Kuzyakov, 2010) was observed at the at the H.J. Andrews DIRT site (Sulzman et al, 2005;Crow et al, 2009) and may have reduced SOC early in the experiment; priming in concert with elevated rates of soil respiration would explain the lack of SOC increase with long-term doubled litter inputs.…”

Section: Changes In Soil Total Carbon Concentrationmentioning

confidence: 91%

Alterations in forest detritus inputs influence soil carbon concentration and soil respiration in a Central-European deciduous forest

Fekete

Kotroczó

Varga

et al. 2014

Soil Biology and Biochemistry

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In a Quercetum petraeae-cerris forest in northeastern Hungary, we examined effects of litter input alterations on the quantity and quality soil carbon stocks and soil CO 2 emissions. Treatments at the Síkfőkút DIRT (Detritus Input and Removal Treatments) experimental site include adding (by doubling) of either leaf litter (DL) or wood (DW) (including branches, twigs, bark), and removing all aboveground litter (NL), all root inputs by trenching (NR), or removing all litter inputs (NI). Within 4 years we saw a significant decrease in soil carbon (C) concentrations in the upper 15 cm for root exclusion plots. Decreases in C for the litter exclusion treatments appeared later, and were smaller than declines in root exclusion plots, highlighting the role of root detritus in the formation of soil organic matter in this forest. By year 8 of the experiment, surface soil C concentrations were lower than Control plots by 32% in NI, 23% in NR and 19% in NL. Increases in soil C in litter addition treatments were less than C losses from litter exclusion treatments, with surface C increasing by 12% in DL and 6% in DW. Detritus additions and removals had significant effects on soil microclimate, with decreases in seasonal variations in soil temperature (between summer and winter) in Double Litter plots but enhanced seasonal variation in detritus exclusion plots. Carbon dioxide (CO 2 ) emissions were most influenced by detritus input quantity and soil organic matter concentration when soils were warm and moist. Clearly changes in detritus inputs from altered forest productivity, as well as altered litter impacts on soil microclimate, must be included in models of soil carbon fluxes and pools with expected future changes in climate.

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Section: Changes In Soil Total Carbon Concentrationmentioning

confidence: 91%

Alterations in forest detritus inputs influence soil carbon concentration and soil respiration in a Central-European deciduous forest

Fekete

Kotroczó

Varga

et al. 2014

Soil Biology and Biochemistry

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“…change in SOM decomposition between bulk soil and rhizosphere soil under the same temperature and moisture conditions, Kuzyakov, 2002;Cheng and Kuzyakov, 2005). Given that previous studies on rhizosphere priming are often conducted on well-watered soils to maintain the same moisture as in the unplanted control treatment (Kuzyakov, 2010), and that most soils are naturally exposed to dryingewetting cycles induced by evapotranspiration and precipitation/irrigation, comparing SOM decomposition in a planted, varying-moisture treatment with that in an unplanted, constantmoisture treatment provides useful information on soil C/N dynamics.…”

Section: Do Dryingewetting Cycles Affect Rhizosphere Priming Effect?mentioning

confidence: 99%

“…rhizodeposition) can increase SOM decomposition up to 3-fold (Cheng et al, 2003;Zhu and Cheng, 2011a), a similar magnitude of soil temperature and moisture effects on SOM decomposition. Although the mechanisms for this rhizosphere priming effect (defined as a change in SOM decomposition by rootderived carbon input) are not completely understood (Kuzyakov, 2002;Cheng and Kuzyakov, 2005;Kuzyakov, 2010), plant biomass and rhizodeposit quantity (Dijkstra et al, 2006;Dijkstra and Cheng, 2007a) have been shown to control the magnitude of rhizosphere priming effect. Increased soil moisture increases the rhizosphere priming effect (Niklaus and Falloon, 2006;Dijkstra and Cheng, 2007b), but the effect of dryingewetting cycles on rhizosphere priming has not been studied.…”

Section: Introductionmentioning

confidence: 99%

Impacts of drying–wetting cycles on rhizosphere respiration and soil organic matter decomposition

Zhu

Cheng

2013

Soil Biology and Biochemistry

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a b s t r a c tDryingewetting cycles influence both soil organic matter (SOM) decomposition and rhizosphere processes. Rhizosphere processes also affect SOM decomposition through rhizosphere priming. However, little is known about how dryingewetting cycles regulate SOM decomposition with rhizosphere priming, because most previous studies incubated root-free soils and omitted the rhizosphere effect. To investigate the effect of dryingewetting cycles on SOM decomposition in the presence of plants, we grew sunflower (Helianthus annuus) and soybean (Glycine max) in a sandy loam soil under the treatments of either constant moisture or 12 dryingewetting cycles, and used a continuous 13 C-labeling method to partition soil respiration into rhizosphere respiration and SOM decomposition. We found that compared to the constantly-moist treatment, the severe dryingewetting cycles in soils planted with sunflower significantly reduced shoot biomass (32%), root biomass (52%), rhizosphere respiration (29%), and SOM decomposition (22%), while the moderate dryingewetting cycles in soils planted with soybean did not significantly affect these variables. Moreover, SOM decomposition rates in the planted treatment subjected to constantly-moist or dryingewetting conditions were significantly higher compared with the constantly-moist unplanted treatment, indicating a positive rhizosphere priming effect under both soil moisture regimes. However, dryingewetting reduced the rhizosphere priming of sunflower (69% versus 33%) likely due to lower plant biomass and rhizodeposition, but produced similar rhizosphere priming of soybean (82% versus 85%). Overall, dryingewetting cycles significantly modulated rhizosphere respiration and SOM decomposition, with the magnitude depending on soil drying intensity and plant growth performance.Published by Elsevier Ltd.

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“…Uma das mais comuns explicações para a ocorrência do efeito "priming", após a adição de substratos com elevada relação C/N, é que os microrganismos buscam N na MOS (C/N relativamente baixa) e isso aumenta sua decomposição e a evolução de CO 2 (Kuzyakov, 2010). Entretanto, as causas para a ocorrência do efeito são diversas (Kuzyakov et al, 2000;Fontaine et al, 2003).…”

Section: Resultsunclassified

“…O maior teor de COT na camada superficial, em SPD, indica que, embora o efeito "priming" possa ter ocorrido (correlação negativa entre COP e COAM), a intensidade dele não foi suficiente para que o sistema perdesse sua capacidade de acumular C no solo. Além disso Kuzyakov (2010) sugere que a ocorrência do efeito "priming" não diminui, necessariamente, os estoques de C no solo, uma vez que a maioria dos estudos mostra incremento líquido dos estoques de C mesmo quando o fenômeno ocorre, no caso de acréscimo em COP mais significativo do que o decréscimo em COAM.…”

Section: Resultsunclassified

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

Lima

Fontenelle

Madeira

et al. 2016

Pesq. agropec. bras.

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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...

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Priming effects: Interactions between living and dead organic matter

Cited by 1,591 publications

References 113 publications

Alterations in forest detritus inputs influence soil carbon concentration and soil respiration in a Central-European deciduous forest

Alterations in forest detritus inputs influence soil carbon concentration and soil respiration in a Central-European deciduous forest

Impacts of drying–wetting cycles on rhizosphere respiration and soil organic matter decomposition

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

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