Impact of air-drying and rewetting on PLFA profiles of soil microbial communities

2007 ◽  
Vol 170 (2) ◽  
pp. 259-264 ◽  
Author(s):  
Ute Hamer ◽  
Manuela Unger ◽  
Franz Makeschin
Keyword(s):  
Microbial Communities ◽  
Soil Microbial Communities ◽  
Air Drying ◽  
Soil Microbial ◽  
Drying And Rewetting

Effects of land use, short-term drought and warming on microbial responses to drying and rewetting

2021 ◽  
Author(s):  
Ainara Leizeaga ◽  
Lettice Hicks ◽  
Albert Brangarí ◽  
Carla Cruz-Paredes ◽  
Menale Wondie ◽  
...  
Keyword(s):  
Land Use ◽  
Microbial Communities ◽  
Soil Microbial Communities ◽  
High Temporal Resolution ◽  
Northern Ethiopia ◽  
Land Uses ◽  
Soil Microbial ◽  
Drying And Rewetting ◽  
Microbial Responses ◽  
Simulated Drought

<p>Climate change predicts an increase in temperature and an intensification of the hydrological cycles resulting in more extreme drought and rainfall events. When dry soils experience a rainfall event, there is a big CO<sub>2</sub> release from soil to the atmosphere which is regulated by soil microorganisms. In the present study, we set out to investigate how drought and warming affects the soil microbial responses to drying and rewetting (DRW); and how those responses are affected by differences in land use. Previous work has shown that exposure DRW cycles in the laboratory and in the field can induce faster recovery (more ‘resilient’) of the microbial responses after a DRW cycle. In addition, a history of drought has been suggested to result in microbial communities with higher carbon use efficiency (CUE) during DRW in a wet heathland in Northern Europe and in semi-arid grasslands in Texas. We wanted to extend these observations to subtropical environments.</p><p> </p><p>With the aim of simulating drought and warming, rain shelters and open top chambers (OTC) were installed in Northern Ethiopia in 2 contrasting land-uses (a degraded cropland and a pristine forest) for 1.5 years. Soils were then sampled and exposed to a DRW cycle in the laboratory. Microbial growth and respiration responses were followed with high temporal resolution over 3 weeks, as well as, changes in microbial community structure.  </p><p> </p><p>Microbial functions universally showed a resilient response after a DRW cycle, with bacterial growth and fungal growth increasing immediately upon rewetting linked with the expected respiration response. The field treatments and land-use differences, therefore, did not have an effect on the resilience of soil microbial communities to DRW cycles. There were differences between the two main decomposer groups: fungi were more resilient than bacteria, as they showed a faster recovery rate. Microbial CUE upon rewetting responded differently in the different field treatments and land-uses. CUE was generally higher in croplands than in forests. Besides, while simulated drought reduced CUE, simulated drought increased CUE. These differences might be explained by either (i) the selection or more efficient microbial communities due to a higher exposure to DRW events or (ii) differences in resource availability (i.e. plant input).  </p>

scholarly journals Response of Microbial Communities and Their Metabolic Functions to Drying–Rewetting Stress in a Temperate Forest Soil

2019 ◽  
Vol 7 (5) ◽  
pp. 129 ◽  
Author(s):  
Dong Liu ◽  
Katharina M. Keiblinger ◽  
Sonja Leitner ◽  
Uwe Wegner ◽  
Michael Zimmermann ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Global Climate ◽  
Soil Microbial Communities ◽  
Biogeochemical Cycles ◽  
Functional Responses ◽  
Soil Microbial ◽  
Metabolic Functions ◽  
Drying And Rewetting ◽  
Different Levels ◽  
Simultaneous Variation

Global climate change is predicted to alter drought–precipitation patterns, which will likely affect soil microbial communities and their functions, ultimately shifting microbially-mediated biogeochemical cycles. The present study aims to investigate the simultaneous variation of microbial community compositions and functions in response to drought and following rewetting events, using a soil metaproteomics approach. For this, an established field experiment located in an Austrian forest with two levels (moderate and severe stress) of precipitation manipulation was evaluated. The results showed that fungi were more strongly influenced by drying and rewetting (DRW) than bacteria, and that there was a drastic shift in the fungal community towards a more Ascomycota-dominated community. In terms of functional responses, a larger number of proteins and a higher functional diversity were observed in both moderate and severe DRW treatments compared to the control. Furthermore, in both DRW treatments a rise in proteins assigned to “translation, ribosomal structure, and biogenesis” and “protein synthesis” suggests a boost in microbial cell growth after rewetting. We also found that the changes within intracellular functions were associated to specific phyla, indicating that responses of microbial communities to DRW primarily shifted microbial functions. Microbial communities seem to respond to different levels of DRW stress by changing their functional potential, which may feed back to biogeochemical cycles.

Alkaline soil pH affects bulk soil, rhizosphere and root endosphere microbiomes of plants growing in a Sandhills ecosystem

2021 ◽  
Vol 97 (4) ◽  
Author(s):  
Lucas Dantas Lopes ◽  
Jingjie Hao ◽  
Daniel P Schachtman
Keyword(s):  
Microbial Communities ◽  
Plant Species ◽  
Soil Ph ◽  
Soil Microbial Communities ◽  
Bulk Soil ◽  
Strong Impact ◽  
Alkaline Soil ◽  
Alkaline Soils ◽  
Soil Microbial ◽  
Soil Rhizosphere

ABSTRACT Soil pH is a major factor shaping bulk soil microbial communities. However, it is unclear whether the belowground microbial habitats shaped by plants (e.g. rhizosphere and root endosphere) are also affected by soil pH. We investigated this question by comparing the microbial communities associated with plants growing in neutral and strongly alkaline soils in the Sandhills, which is the largest sand dune complex in the northern hemisphere. Bulk soil, rhizosphere and root endosphere DNA were extracted from multiple plant species and analyzed using 16S rRNA amplicon sequencing. Results showed that rhizosphere, root endosphere and bulk soil microbiomes were different in the contrasting soil pH ranges. The strongest impact of plant species on the belowground microbiomes was in alkaline soils, suggesting a greater selective effect under alkali stress. Evaluation of soil chemical components showed that in addition to soil pH, cation exchange capacity also had a strong impact on shaping bulk soil microbial communities. This study extends our knowledge regarding the importance of pH to microbial ecology showing that root endosphere and rhizosphere microbial communities were also influenced by this soil component, and highlights the important role that plants play particularly in shaping the belowground microbiomes in alkaline soils.

LDPE microplastics affect soil microbial communities and nitrogen cycling

2021 ◽  
Vol 773 ◽  
pp. 145640
Author(s):  
Lili Rong ◽  
Longfei Zhao ◽  
Leicheng Zhao ◽  
Zhipeng Cheng ◽  
Yiming Yao ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Nitrogen Cycling ◽  
Soil Microbial Communities ◽  
Soil Microbial

Azorella Cushion Plants and Aridity are Important Drivers of Soil Microbial Communities in Andean Ecosystems

Ecosystems ◽  
2021 ◽  
Author(s):  
Susana Rodríguez-Echeverría ◽  
Manuel Delgado-Baquerizo ◽  
José A. Morillo ◽  
Aurora Gaxiola ◽  
Marlene Manzano ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Soil Microbial Communities ◽  
Soil Microbial ◽  
Cushion Plants
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