Prolonged drought changes the bacterial growth response to rewetting

Meisner, Annelein; Rousk, Johannes; Bååth, Erland

doi:10.1016/j.soilbio.2015.06.002

Cited by 125 publications

(102 citation statements)

References 68 publications

(78 reference statements)

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“…The pulse effect may also be influenced by the measurement interval. Previous studies used measurement intervals of several hours or days (Casals et al, 2009;Fierer and Schimel, 2003;Meisner et al, 2015). Hence, when comparing different studies, we should consider differences in precipitation intensity, previous soil water condition and measurement interval.…”

Section: Rapid and Strong Pulse Effects Of Precipitationmentioning

confidence: 99%

“…This hypothesis parallels our study but is different from that of Meisner et al (2013) who have shown that microbial growth is uncoupled from the initial respiration pulse, and that growth responses and microbial C-use efficiency can be affected by prolonged drying. The fact that this microbial effect has not yet reached a consensus may be attributed to prolonged drought or perhaps variance in soil conditions before air drying or rewetting (Meisner et al, 2015).…”

Section: Influence Of Forest Type On the Pulse Effects Of Precipitationmentioning

confidence: 99%

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Strong pulse effects of precipitation events on soil microbial respiration in temperate forests

Wang

Liu

et al. 2016

Geoderma

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Precipitation is a critical factor triggering soil biogeochemical processes in arid and semi-arid regions. In this study, we selected soils from two temperate forests-a mature natural forest and a degraded secondary forest-in a semi-arid region. We investigated the pulse effects of simulated precipitation (to reach 55% soil water-holding capacity) on the soil microbial respiration rate (R S ). We performed high-intensity measurements (at 5-min intervals for 48 h) to determine the maximum value of R S (R S-max ), the time to reach R S-max (T R S-max ), and the duration of the pulse effect (from the start to the end of ½R S-max ). The responses of R S to simulated precipitation were rapid and strong. R S-max was significantly higher in degraded secondary forest (18.69 μg C g soil) than in mature natural forest (7.94 μg C g soil). In contrast, the duration of the pulse effect and T R S-max were significantly lower in degraded secondary forest than in mature natural forest. Furthermore, the accumulative microbial respiration per gram of soil (A R S-soil ) did not differ significantly between degraded secondary forest and mature natural forest, but the accumulative microbial respiration per gram of soil organic C (A R S-soc ) was significantly higher in degraded secondary forest than in mature natural forest. Soil microbial biomass, soil nutrient, and litter nitrogen content were strongly correlated with the duration of the pulse effect and T R S-max . Soil physical structure, pH, and litter nitrogen content were strongly correlated with R S-max and A R S-soc . Our results indicate that the responses of soil microbial respiration to simulated precipitation are rapid and strong and that microbial respiration rate per gram C can be used to precisely determine the precipitation pulse of different soil samples as well as the effects of changing precipitation patterns on soil C content under various scenarios of global climate change.

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Section: Rapid and Strong Pulse Effects Of Precipitationmentioning

confidence: 99%

Section: Influence Of Forest Type On the Pulse Effects Of Precipitationmentioning

confidence: 99%

Strong pulse effects of precipitation events on soil microbial respiration in temperate forests

Wang

Liu

et al. 2016

Geoderma

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“…There is a known uncoupling of rates of CO 2 efflux and detectable microbial growth rates after a DRW cycle (Iovieno and Bååth, 2008, Meisner et al., 2015) and microbial populations in such circumstances show little change in their net size (Fierer and Schimel, 2002). However, recent work by Blazewicz et al.…”

mentioning

confidence: 99%

“…This is likely because the 3-day drying period resulted in different amounts of moisture loss between treatments; those exposed to the prescribed DRW cycle lost 34% of their mass on average over the 3 days of drying, however, the moist controls lost only 16% of their mass on average. This shows that soil dried to a greater extent will give a larger flush of CO 2 on rewetting than a sample of the same soil dried less severely (Kieft et al., 1987, Fierer and Schimel, 2002, Unger et al., 2010, Meisner et al., 2015). Those samples treated with 15% TCA and 1% AgNO 3 dried to a greater extent over 3 days than the moist controls (21 and 28% mass loss respectively) and those that were autoclaved lost 45% of their mass on average.…”

mentioning

confidence: 99%

On the origin of carbon dioxide released from rewetted soils

Fråser

Corstanje

Deeks

et al. 2016

Soil Biology and Biochemistry

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When dry soils are rewetted a pulse of CO2 is invariably released, and whilst this phenomenon has been studied for decades, the precise origins of this CO2 remain obscure. We postulate that it could be of chemical (i.e. via abiotic pathways), biochemical (via free enzymes) or biological (via intact cells) origin. To elucidate the relative contributions of the pathways, dry soils were either sterilised (double autoclaving) or treated with solutions of inhibitors (15% trichloroacetic acid or 1% silver nitrate) targeting the different modes. The rapidity of CO2 release from the soils after the drying:rewetting (DRW) cycle was remarkable, with maximal rates of evolution within 6 min, and 41% of the total efflux over 96 h released within the first 24 h. The complete cessation of CO2 eflux following sterilisation showed there was no abiotic (dissolution of carbonates) contribution to the CO2 release on rewetting, and clear evidence for an organismal or biochemical basis to the flush. Rehydration in the presence of inhibitors indicated that there were approximately equal contributions from biochemical (outside membranes) and organismal (inside membranes) sources within the first 24 h after rewetting. This suggests that some of the flux was derived from microbial respiration, whilst the remainder was a consequence of enzyme activity, possibly through remnant respiratory pathways in the debris of dead cells.

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“…Gram positive bacteria could be survive in drought environment by spore. Drought periode could be promote of presence of spore forming bacteria (Meisner et al 2015).…”

Section: Discussionmentioning

confidence: 99%