Microbial biomass response to a rapid increase in water potential when dry soil is wetted

Kieft, Thomas L.; soroker, Edith; Firestone, Mary K.

doi:10.1016/0038-0717(87)90070-8

Cited by 747 publications

(402 citation statements)

References 25 publications

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“…3) is in agreement with many previous studies (Kieft et al, 1987;Fierer and Schimel, 2002;Xiang et al, 2008;Butterly et al, 2009) and can be explained by the release of easily decomposable organic compounds upon rewetting and their depletion. The stabilisation of the respiration rates after about 8 days after rewetting is also in accordance with previous studies (Butterly et al, 2010).…”

Section: Discussionsupporting

confidence: 92%

Effects of Rewetting of Air-Dry Soil and Adaptation to Low Matric and Osmotic Potential

Chowdhury¹

2015

International J. of Soil Science

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When conducting incubation experiments to measure soil respiration in response to a given treatment in soils of different texture, it is important to have baseline information about the soils and to ensure that the effect of the storage or pre-incubation conditions on the results are minimized. Three experiments were conducted with up to seven soils (3 non-saline, 4 saline) to investigate (1) The relationship between soil water content or water potential and soil respiration, (2) The time required until soil respiration is stabilized after rewetting of air-dry soil and (3) If pre-incubation at a given matric or osmotic potential changes the response of soil respiration to matric or osmotic potential. The texture of the soils varied from sand to sandy loam. Cumulative respiration showed an optimum curve in response to differential soil water content in all 7 soils, but the maximal cumulative respiration was reached at different water content in the soil, being 45 g kgG 1 for the non-saline sand and 200 g kgG 1 for the non-saline sandy loam. However, when expressed against water potential, maximal cumulative respiration was achieved between 0 and -1 MPa in all soils. Rewetting of air-dry soil induced a flush of respiration in the first 1-2 days, but respiration rates stabilized 7-8 days after rewetting in all soils. Pre-incubation at low matric or osmotic potential for two weeks did not significantly affect soil respiration at low matric or osmotic potential in the following two weeks compared to soils which had been pre-incubated at optimal matric potential and high osmotic potential. In conclusion, when comparing the response of respiration to water availability among soils of different texture it is important to consider water potential and not water content. Furthermore, an adaptation period of 2 weeks does not seem to increase the tolerance of soil respiration to low osmotic or matric potential compared to non-adapted soils.

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Section: Discussionsupporting

confidence: 92%

Effects of Rewetting of Air-Dry Soil and Adaptation to Low Matric and Osmotic Potential

Chowdhury¹

2015

International J. of Soil Science

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“…3). It has been reported that rapid rehydration can kill between 17 and 58% of soil microbes through osmotic shock and cell rupture [56] and the contribution of microbial lysis has been subsequently confirmed by direct bacterial cell counting in rewetted Australian pasture soils [57].…”

Section: Soilsmentioning

confidence: 90%

Sampling, sample treatment and quality assurance issues for the determination of phosphorus species in natural waters and soils

Worsfold

Gimbert

Mankasingh

et al. 2005

Talanta

162

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“…As a whole, the bacterial community appears to tolerate the rapid upshock in water potential (influx of water), which is known to cause lysis (plasmoptysis) in many bacterial cells that have adjusted to low water potential conditions (Kieft et al, 1987;Halverson et al, 2000). On the basis of the rapid (within 2 h) increase in rRNA in bacteria, archaea and fungi, the members of these soil communities appear to be poised for immediate response to rewetting (Placella et al, 2012); this is consistent with the large pulses of CO 2 that result from wetting of dry soil (Borken and Matzner, 2009;Inglima et al, 2009).…”

Section: Bacterial and Fungal Community-level Responsementioning

confidence: 99%

Responses of soil bacterial and fungal communities to extreme desiccation and rewetting

2013

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The microbial response to summer desiccation reflects adaptation strategies, setting the stage for a large rainfall-induced soil CO 2 pulse upon rewetting, an important component of the ecosystem carbon budget. In three California annual grasslands, the present (DNA-based) and potentially active (RNA-based) soil bacterial and fungal communities were tracked over a summer season and in response to controlled rewetting of intact soil cores. Phylogenetic marker genes for bacterial (16S) and fungal (28S) RNA and DNA were sequenced, and the abundances of these genes and transcripts were measured. Although bacterial community composition differed among sites, all sites shared a similar response pattern of the present and potentially active bacterial community to dry-down and wet-up. In contrast, the fungal community was not detectably different among sites, and was largely unaffected by dry-down, showing marked resistance to dessication. The potentially active bacterial community changed significantly as summer dry-down progressed, then returned to pre-dry-down composition within several hours of rewetting, displaying spectacular resilience. Upon rewetting, transcript copies of bacterial rpoB genes increased consistently, reflecting rapid activity resumption. Acidobacteria and Actinobacteria were the most abundant phyla present and potentially active, and showed the largest changes in relative abundance. The relative increase (Actinobacteria) and decrease (Acidobacteria) with dry-down, and the reverse responses to rewetting reflected a differential response, which was conserved at the phylum level and consistent across sites. These contrasting desiccation-related bacterial life-strategies suggest that predicted changes in precipitation patterns may affect soil nutrient and carbon cycling by differentially impacting activity patterns of microbial communities.

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Microbial biomass response to a rapid increase in water potential when dry soil is wetted

Cited by 747 publications

References 25 publications

Effects of Rewetting of Air-Dry Soil and Adaptation to Low Matric and Osmotic Potential

Effects of Rewetting of Air-Dry Soil and Adaptation to Low Matric and Osmotic Potential

Sampling, sample treatment and quality assurance issues for the determination of phosphorus species in natural waters and soils

Responses of soil bacterial and fungal communities to extreme desiccation and rewetting

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