scholarly journals Mitigation of Eutrophication in a Shallow Lake: The Influences of Submerged Macrophytes on Phosphorus and Bacterial Community Structure in Sediments

2021 ◽  
Vol 13 (17) ◽  
pp. 9833
Author(s):  
Juanjuan Wang ◽  
Siwen Zhang ◽  
Tianyang Que ◽  
Anna H. Kaksonen ◽  
Xiaoqing Qian ◽  
...  
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Bacterial Community ◽  
Shallow Lake ◽  
Bacterial Community Structure ◽  
Α Diversity ◽  
P Immobilization ◽  
One Year ◽  
Vigorous Plant ◽  
And Control

Remediating water eutrophication is critical for maintaining healthy and sustainable development of lakes. The aim of this study was to explore the seasonal variation in phosphorus (P) speciation and bacterial community structure in sediments of Qin Lake (Taizhou, Jiangsu Province, China) associated with the growth of submerged macrophyte Vallisneria natans. The differences in sediment bacterial diversity and community structure between V. natans growing and control areas were analyzed over a period of one year. The results showed that V. natans growth reduced the total P and organic matter contents of the sediments and increased the bioavailable iron (Fe) and Fe-bound P contents. The α-diversity of sediment bacteria was significantly higher in the presence of V. natans than in the controls during the vigorous plant growth stage. In the presence of V. natans, there was a higher relative abundance of Proteobacteria and lower relative abundances of Chloroflexi and Acidobacteria. The Fe(II) content in the sediment had a larger influence on the spatial distribution of bacterial communities than sediment Fe-bound P, organic matter, and Fe(II) contents. V. natans growth could reshape sediment bacterial community structure in the shallow lake, which, in turn, enhanced P immobilization in the sediments and thereby improved the water quality.

scholarly journals Effects of enrichmemt planting with native tree species on bacterial community structure and potential impact on Eucalyptus plantations in southern China

2022 ◽  
Author(s):  
Yuxing Xu ◽  
Chao Li ◽  
Wankuan Zhu ◽  
Zhichao Wang ◽  
Lichao Wu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Third Generation ◽  
The Third ◽  
Α Diversity ◽  
Native Tree ◽  
Native Tree Species ◽  
Mixed Systems

AbstractMulti-generational planting of Eucalyptus species degrades soil quality but the introduction of legumes can improve soil fertility and microbial diversity. However, the effects of introducing non-legume native tree species on soil nutrients and bacterial community structure remain poorly understood. This study investigated the impacts of the conversion of third generation monoculture Eucalyptus plantations to mixed systems including Eucalyptus urograndis with Cinnamomum camphora (EC) and E. urograndis with Castanopsis hystrix (EH), on soil chemical and biochemical properties and bacterial community structure, diversity and functions. First generation E. urophylla plantations were the control. Results show that planting the third generation Eucalyptus led to a significant decrease in pH, organic matter, nutrient content, enzyme activities (invertin, acid phosphataes, and urease), and bacterial α-diversity compare to the controls. However, the mixed planting showed significant improvement in soil chemical and biochemical attributes and bacterial α-diversity, although the E. urograndis and C. hystrix planting had no improvement. Chloroflexi (oligotrophic bacteria) were significantly enriched in third generation Eucalyptus and Eucalyptus + C. hystrix, while proteobacteria increased significantly in the E. urograndis with C. camphora plantings. The relative abundance of multiple metabolic pathways increased significantly in the third generation Eucalyptus plantations whereas membrane transport-related genes were enriched in soils of the mixed systems. The changes in bacterial community structures in the two mixed systems were driven by diversity, organic matter and acid phosphatase, while bacterial functions were affected by invertase, $${\mathrm{NO}}_{3}^{-}$$ NO 3 - -N, diversity and urease. These results suggest that the transformation of successive monoculture Eucalyptus plantations into mixed plantations reduces the depletion of soil nutrients and enhances the ecological function of soil microorganisms.

Relationships between Soil Organic Matter, Nutrients, Bacterial Community Structure, And the Performance of Microbial Fuel Cells

2012 ◽  
Vol 46 (3) ◽  
pp. 1914-1922 ◽  
Author(s):  
Sara J. Dunaj ◽  
Joseph J. Vallino ◽  
Mark E. Hines ◽  
Marcus Gay ◽  
Christine Kobyljanec ◽  
...  
Keyword(s):  
Organic Matter ◽  
Fuel Cells ◽  
Community Structure ◽  
Soil Organic Matter ◽  
Bacterial Community ◽  
Microbial Fuel Cells ◽  
Bacterial Community Structure

scholarly journals Application of Broccoli Residues to Soil can Suppress Verticillium Wilt of Cotton by Regulating the Bacterial Community Structure of the Rhizosphere

2021 ◽  
Author(s):  
Weisong Zhao ◽  
Qinggang Guo ◽  
Shezeng Li ◽  
Xiuyun Lu ◽  
Peipei Wang ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Community ◽  
High Throughput ◽  
Verticillium Wilt ◽  
Bacterial Community Structure ◽  
High Throughput Sequencing ◽  
Field Experiments ◽  
Cotton Seeds ◽  
Relative Abundances ◽  
And Control

Abstract [Aims] Verticillium wilt (VW) of cotton was effectively controlled by application of broccoli residues (BR) to soil. Information regarding the variation in bacterial communities in rhizosphere of cotton cultivars with different VW resistance levels under BR treatment is still lacking and finally to provide guidance for screening effective biocontrol bacteria. [Methods] Real-time fluorescence quantitative PCR was used to determine the population of Verticillium dahliae, the effects of BR on the bacterial community structure in rhizosphere were determined by high-throughput sequencing technology. [Results] Results showed that control effects for susceptible cultivar (cv. EJ-1) and resistant cultivar (cv. J863) on VW after BR treatment were 51.76% and 86.15%, the population of V. dahliae decreased by 18.88% and 30.27%, respectively. High-throughput sequencing showed that ACE and Chao1 indices were increased by application of BR. Actinobacteria, Proteobacteria, Bacteroidetes, Gemmatimonadetes, Acidobacteria, and Firmicutes were the most dominant phyla, and relative abundances of these bacterial taxa significantly differed between cultivars. Additionally, Bacillus stably increased in rhizosphere following BR treatment. Redundancy analysis (RDA) showed that relative abundances of Bacillus, Lysobacter, Streptomyces, Rubrobacter, Gemmatimonas, Bryobacter and Nocardioides were correlated with occurrence of VW. Field experiments demonstrated that dressing cotton seeds with Bacillus subtilis NCD-2 could successfully reduce occurrence of VW, and control effects for EJ-1 and J863 were 35.26% and 31.02%, respectively. [Conclusions] The application of BR changed the bacterial community structure in cotton rhizosphere, decreased the population of V. dahliae in soil, and increased the abundance of beneficial microorganisms, thus significantly reducing the occurrence of VW.

Nutrient availability and organic matter quality shape bacterial community structure in a lake biofilm

2020 ◽  
Vol 85 ◽  
pp. 1-18
Author(s):  
RC Seballos ◽  
KH Wyatt ◽  
RJ Bernot ◽  
SP Brown ◽  
S Chandra ◽  
...  
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Heterotrophic Bacteria ◽  
Interspecific Interactions ◽  
Molecular Techniques ◽  
Nitrogen And Phosphorus ◽  
Microbial Composition ◽  
Organic Matter Quality

Heterotrophic bacteria play a key role in ecosystem processes, but little is known about the factors that shape bacterial community structure in aquatic biofilms, especially in lakes. We used molecular techniques (16S rRNA) to evaluate resource controls on biofilm bacterial community structure in an oligotrophic subalpine lake. We manipulated nutrients (nitrogen and phosphorus; NP) and glucose (G) on inorganic (rock) and organic (wood) substrates under light and dark conditions (i.e. with and without autotrophy, respectively) in a full factorial design using nutrient diffusing substrates in situ for 20 d. Distinct patterns of separation in community structure between treatments with nutrients (NP, NP+G) and without nutrients (control, G-only) indicated that community structure was more strongly influenced by nutrients than organic matter irrespective of substrate type or light availability. Further separation in community structure between treatments with nutrients only (NP) and nutrients with glucose (NP+G) on both organic and inorganic substrates indicated that once nutrient limitation was alleviated, organic matter quality played an important role in shaping community structure. Differences in the relative abundance of 6 phyla, 3 classes, and 19 genera among treatments revealed (1) contrasting taxa-specific resource requirements, (2) the influence of interspecific interactions on composition, and (3) the potential for individual taxa to participate in the decomposition of recalcitrant organic matter. Our findings provide insight into the role that nutrients and organic matter quality play in shaping bacterial community structure, which is a critical step in bridging the knowledge gap between microbial composition and ecosystem function within aquatic environments.

scholarly journals Bacterial community structure in the Bohai Strait provides insights into organic matter niche partitioning

2018 ◽  
Vol 169 ◽  
pp. 46-54 ◽  
Author(s):  
Yibo Wang ◽  
Bin Wang ◽  
Lisa M. Dann ◽  
James G. Mitchell ◽  
Xiaoke Hu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Niche Partitioning ◽  
Bohai Strait
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