The effect of aggregate disruption on the activity of microorganisms in the soil

Rovira, A. D.; Greacen, EL

doi:10.1071/ar9570659

Cited by 255 publications

(86 citation statements)

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“…Surface soils and estuarine sediments have relatively high nutrient fluxes and biomass. Mixing material in these systems results in a very rapid (hours to few days) flush of microbial activity [7,12,32]. Respiration decreases in soil that has been mixed and stored for up to several months [29,30,31,36,37,38,39].…”

Section: Discussionmentioning

confidence: 99%

Post-Sampling Changes in Microbial Community Composition and Activity in a Subsurface Paleosol

Brockman

Fredrickson

et al. 1998

Microbial Ecology

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A B S T R A C TLaboratory storage of deep vadose zone sediments has previously resulted in an increase in the abundance of cultured microorganisms by as much as 10,000-fold, without concomitant increases in total microscopic counts. In the present study, factors contributing to the time-dependent stimulation of various microbiological parameters were examined during a 224 d post-sampling period, using a factorial-design experiment that partitioned the effects of storage time, sediment condition (intact blocks or homogenized) during storage, and O 2 concentration (0.5, 4.5, and 21%) during storage at 15°C. Stored samples were analyzed at selected intervals, to determine direct microscopic counts, viable biomass, lipid biomarker profiles, cultured aerobic heterotrophic microorganisms, and microbial activity. Time of storage prior to analysis of the samples was the most important factor affecting the microbiological response. Sediment condition influenced the stimu-

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Section: Discussionmentioning

confidence: 99%

Post-Sampling Changes in Microbial Community Composition and Activity in a Subsurface Paleosol

Brockman

Fredrickson

et al. 1998

Microbial Ecology

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“…Conventional tillage is generally detrimental to soil structure by continually exposing new soil to wet-dry and freeze-thaw cycles at the surface [35,217], thereby increasing the disruption of aggregates. Converting from CT to NT generally increases aggregation (Fig.…”

Section: Mechanisms Of C Sequestration Under No-tillagementioning

confidence: 99%

Soil organic matter, biota and aggregation in temperate and tropical soils - Effects of no-tillage

Feller²,

et al. 2002

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-The long-term stabilization of soil organic matter (SOM) in tropical and temperate regions is mediated by soil biota (e.g. fungi, bacteria, roots and earthworms), soil structure (e.g. aggregation) and their interactions. On average, soil C turnover was twice as fast in tropical compared with temperate regions, but no major differences were observed in SOM quality between the two regions. Probably due to the soil mineralogy dominated by 1:1 clay minerals and oxides in tropical regions, we found a higher aggregate stability, but a lower correlation between C contents and aggregate stability in tropical soils. In addition, a smaller amount of C associated with clay and silt particles was observed in tropical versus temperate soils. In both tropical and temperate soils, a general increase in C levels (≈ 325 ± 113 kg C·ha -1 ·yr -1 ) was observed under no-tillage compared with conventional tillage. On average, in temperate soils under no-tillage, compared with conventional tillage, CH 4 uptake (≈ 0.42 ± 0.10 kg C-CH 4 ·ha -1 ·yr -1 ) increased and N 2 O emissions increased (≈ 1.95 ± 0.45 kg N-N 2 O·ha -1 ·yr -1 ). These increased N 2 O emissions lead to a negative global warming potential when expressed on a CO 2 equivalent basis. La stabilisation à long terme de la matière organique du sol (MOS) dans les régions tempérées et intertropicales est sous la dépendance de l'activité biologique (champignons, bactéries, macrofaune et racines), de la structure du sol (agrégation) et de leurs interactions. En moyenne, si le turnover du carbone du sol (C) est environ deux fois plus rapide en régions intertropicales qu'en régions tempérées, peu de différences apparaissent toutefois quant à la qualité de la MOS sous ces climats différents. La stabilité de l'agrégation est plus élevée pour les sols des régions intertropicales, ceci étant probablement dû à leur minéralogie dominée par des argiles de type 1:1 associés à des oxihydroxides métalliques. Toutefois, pour les sols tropicaux, la corrélation entre teneur en C et stabilité de l'agrégation est plus faible et de moindres quantités de C sont associées avec les éléments fins (argile+limon). Aussi bien sous climats tempéré que tropical et subtropical, une augmentation générale des stocks de C du sol (≈ 325 ± 113 kg C·ha -1 ·an -1 ) est observée avec les pratiques de non labour. Pour les sols des régions tempérées, si une fixation de CH 4 (≈ 0.42 ± 0.10 kg C-CH 4 ·ha -1 ·an -1 ) est mesurée sous non-labour, parallèlement une émission de N 2 O est observée (≈ 1.95 ± 0.45 kg N-N 2 O·ha -1 ·an -1 ), conduisant finalement à un bilan négatif en terme de réchauffement global exprimé en équivalents de flux de C-CO 2 .carbone du sol / agrégation / émissions N 2 O / non-labour / régions tempérées et intertropicales INTRODUCTIONThe conservation of sufficient soil organic matter (SOM) levels is crucial for the biological, chemical and physical soil functioning in both temperate and tropical ecosystems. Appropriate levels of SOM ensure soil fertility and minimize agricultural impac...

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“…It has been conferred that tillage may expose previously protected organic matter that may serve as a substrate for microbial growth (Rovira and Greacen, 1957). Soil quality is strongly influenced by microbe-mediated processes (Powlson et al, 2001) and microbial-based indicators of soil quality such as microbial biomass are believed to be more dynamic than those based on physical and chemical properties (Karlen et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Physical, chemical and microbiological properties of an Andisol as related to land use and tillage practice

Rahman

Okubo

Sugiyama

et al. 2008

Soil and Tillage Research

141

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The effect of aggregate disruption on the activity of microorganisms in the soil

Cited by 255 publications

References 0 publications

Post-Sampling Changes in Microbial Community Composition and Activity in a Subsurface Paleosol

Post-Sampling Changes in Microbial Community Composition and Activity in a Subsurface Paleosol

Soil organic matter, biota and aggregation in temperate and tropical soils - Effects of no-tillage

Physical, chemical and microbiological properties of an Andisol as related to land use and tillage practice

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