scholarly journals Responses of Soil Organic Carbon Sequestration Potential and Bacterial Community Structure in Moso Bamboo Plantations to Different Management Strategies in Subtropical China

Forests ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 657 ◽  
Author(s):  
Chuanbao Yang ◽  
Zheke Zhong ◽  
Xiaoping Zhang ◽  
Fangyuan Bian ◽  
Xuhua Du
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Management Strategies ◽  
Moso Bamboo ◽  
Mineralization Rate ◽  
Bamboo Forest ◽  
C Mineralization ◽  
Sequestration Potential ◽  
The Impact

Moso bamboo is one of the fastest-growing plants in the world. The objective of this study was to investigate the impact of converting secondary broadleaf evergreen forests (CK) to Moso bamboo plantations, and the impact of different management strategies, including no disturbance (M0), extensive management (M1), and intensive management (M2), on the soil organic carbon (SOC) sequestration potential, and relevant characteristics of the soil bacterial community. Our results showed that, in comparison with CK, M0 and M1 had significantly higher SOC and recalcitrant organic materials (aliphatic and aromatic compounds), and a lower C mineralization rate, whereas M2 had the opposite effects. The conversion from CK to Moso bamboo plantation significantly decreased the relative abundance of Acidobacteria in both the topsoil and subsoil soil layers. Compared with CK, M0 led to the enrichment of bacteria such as Alphaproteobacteria, Chloroflexi, and Bacteroidetes, which are involved in the decomposition of organic matter and the formation of humus and are, therefore, potentially beneficial for increasing the SOC. Furthermore, the ratio of the microbial biomass C (MBC) to total organic C (TOC), C mineralization rate, and bacterial diversity increased from M0 to M2, i.e., with an increase in the disturbance intensity. These findings indicate that the conversion of secondary broadleaf forest to bamboo forest alter the soil bacterial community structure. Reducing disturbance in bamboo forest management strategies should be actively taken up to improve the SOC, and maintain sustainable development in the forest industry.

Tu1716 Evaluation of the Impact of Different Commercially Available DNA Extraction Kits and Laboratories for Assessing Bacterial Community Structure in Fecal Samples - Implications for IBD Research

2013 ◽  
Vol 144 (5) ◽  
pp. S-829
Author(s):  
Nicholas A. Kennedy ◽  
Alan Walker ◽  
UK IBD Microbiota Consortia ◽  
UK IBD Genetics Consortia ◽  
Susan H. Berry ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Dna Extraction ◽  
Bacterial Community Structure ◽  
Fecal Samples ◽  
The Impact

scholarly journals The impact of host rock geochemistry on bacterial community structure in oligotrophic cave environments

2007 ◽  
Vol 36 (2) ◽  
pp. 93-104 ◽  
Author(s):  
Hazel Barton ◽  
Nicholas Taylor ◽  
Michael Kreate ◽  
Austin Springer ◽  
Stuart Oehrle ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Host Rock ◽  
Bacterial Community Structure ◽  
The Impact

scholarly journals Corexit 9500 Enhances Oil Biodegradation and Changes Active Bacterial Community Structure of Oil-Enriched Microcosms

2017 ◽  
Vol 83 (10) ◽  
Author(s):  
Stephen M. Techtmann ◽  
Mobing Zhuang ◽  
Pablo Campo ◽  
Edith Holder ◽  
Michael Elk ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Microbial Communities ◽  
Bacterial Community Structure ◽  
Oil Spills ◽  
Content Type ◽  
Corexit 9500 ◽  
Oil Biodegradation ◽  
Degrading Bacteria ◽  
The Impact

ABSTRACT To better understand the impacts of Corexit 9500 on the structure and activity levels of hydrocarbon-degrading microbial communities, we analyzed next-generation 16S rRNA gene sequencing libraries of hydrocarbon enrichments grown at 5 and 25°C using both DNA and RNA extracts as the sequencing templates. Oil biodegradation patterns in both 5 and 25°C enrichments were consistent with those reported in the literature (i.e., aliphatics were degraded faster than aromatics). Slight increases in biodegradation were observed in the presence of Corexit at both temperatures. Differences in community structure were observed between treatment conditions in the DNA-based libraries. The 25°C consortia were dominated by Vibrio, Idiomarina, Marinobacter, Alcanivorax, and Thalassospira species, while the 5°C consortia were dominated by several species of the genera Flavobacterium, Alcanivorax, and Oleispira. Most of these genera have been linked to hydrocarbon degradation and have been observed after oil spills. Colwellia and Cycloclasticus, known aromatic degraders, were also found in these enrichments. The addition of Corexit did not have an effect on the active bacterial community structure of the 5°C consortia, while at 25°C, a decrease in the relative abundance of Marinobacter was observed. At 25°C, Thalassospira, Marinobacter, and Idiomarina were present at higher relative abundances in the RNA than DNA libraries, suggesting that they were active in degradation. Similarly, Oleispira was greatly stimulated by the addition of oil at 5°C. IMPORTANCE While dispersants such as Corexit 9500 can be used to treat oil spills, there is still debate on the effectiveness on enhancing oil biodegradation and its potential toxic effect on oil-degrading microbial communities. The results of this study provide some insights on the microbial dynamics of hydrocarbon-degrading bacterial populations in the presence of Corexit 9500. Operational taxonomic unit (OTU) analyses indicated that several OTUs were inhibited by the addition of Corexit. Conversely, a number of OTUs were stimulated by the addition of the dispersant, many of which were identified as known hydrocarbon-degrading bacteria. The results highlight the value of using RNA-based methods to further understand the impact of dispersant on the overall activity of different hydrocarbon-degrading bacterial groups.

scholarly journals Shift of anammox bacterial community structure along the Pearl Estuary and the impact of environmental factors

2015 ◽  
Vol 120 (4) ◽  
pp. 2869-2883 ◽  
Author(s):  
Bingbing Fu ◽  
Jiwen Liu ◽  
Hongmei Yang ◽  
Ting Chang Hsu ◽  
Biyan He ◽  
...  
Keyword(s):  
Community Structure ◽  
Environmental Factors ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
The Impact

scholarly journals Influence of hydrological factors on bacterial community structure in a tropical monsoonal estuary in India

2021 ◽  
Author(s):  
Parvathi Ammini ◽  
Michela R Catena ◽  
Jasna Vijayan ◽  
Nikhil Phadke ◽  
Nikhita Gogate
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Communities ◽  
Bacterial Community Structure ◽  
Salinity Gradient ◽  
Pearson Correlation ◽  
Temporal Variations ◽  
Spatial And Temporal Variation ◽  
Physico Chemical ◽  
The Impact

Abstract In the present study, we analysed variations in bacterial community structure along a salinity gradient in a tropical monsoonal estuary (Cochin estuary, CE), on the southwest coast of India, using Illumina next-generation sequencing (NGS). Water samples were collected from eight different locations thrice a year, to assess the variability in the bacterial community structure and to determine the physico-chemical factors influencing the bacterial diversity. Proteobacteria was the most dominant phyla in the estuary followed by Bacteroidetes, Cyanobacteria, Actinobacteria, and Firmicutes. Statistical analysis indicated significant variations in bacterial communities between freshwater, mesohaline and euryhaline regions, as well as between the monsoon (wet) and non-monsoon (dry) periods. Non-metric multidimensional scaling (NMDS) analysis demonstrated that the bacterial communities cluster according to different salinity regimes of the estuary. Canonical Correspondence analysis (CCA) showed a clear spatial and temporal variation in the distribution of bacterial communities in the CE. Abundance of Betaproteobacteria was high in the freshwater regions, while Gammaproteobacteria, Alphaproteobacteria and Epsilonproteobactera were more abundant in mesohaline and euryhaline regions of the estuary. Correlagram based on Pearson correlation analysis demonstrated the impact of different physico-chemical variables on the distribution of dominant phyla, class and genera. Spatial and temporal variations in bacterial community structure could be due to regional variations in environmental conditions imparted by allochthonous inputs, monsoonal rainfall, and tidal influence.

Impact of an urban effluent on the bacterial community structure in the Arga River (Spain), with special reference to culturable Gram-negative rods

1999 ◽  
Vol 45 (10) ◽  
pp. 826-832 ◽  
Author(s):  
Marisol Goñi-Urriza ◽  
Michèle Capdepuy ◽  
Nathalie Raymond ◽  
Claudine Quentin ◽  
Pierre Caumette
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Heterotrophic Bacteria ◽  
Sampling Station ◽  
Gram Negative ◽  
Structure Changes ◽  
Sampling Zone ◽  
The Impact ◽  
Urban Effluent

The Arga River is an interesting system in which to study the impact of urban effluent pollution because it receives a single effluent in the form of wastewater discharge from the city of Pamplona. To analyze the extent of this discharge, total bacteria, culturable heterotrophic bacteria, and Gram-negative heterotrophic bacteria were enumerated and 409 isolates of the latter were identified. One sampling station was located upstream from the inflow, while five were located up to 30 km downstream. Bacterial counts increased drastically downstream from the wastewater inflow. Total bacterial numbers decreased along the 30 km downstream, the last station attaining similar values to those recorded upstream from the discharge. However, culturable heterotrophic and Gram-negative heterotrophic bacteria levels generally remained significantly higher within the 30 km zone investigated. Among the 409 isolates identified, Aeromonas spp. were the most frequent both upstream and downstream from the discharge. In contrast, although strains belonging to different genera of Enterobacteriaceae were found in all stations, their occurrence was significantly higher just downstream from the polluted discharge. Acinetobacter spp., which were never found upstream, were detected in all stations below the discharge. Our results clearly show that the bacterial community structure changes definitively downstream from the discharge and that Aeromonas were common throughout the sampling zone. Thus they cannot be considered good indicators of pollution in this setting compared to some genera of Enterobacteriaceae or some species ofAcinetobacter, the distribution of which correlated better with the distance from the wastewater discharge.Key words: Aeromonas, Enterobacteriaceae, sewage, freshwater.

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