scholarly journals Effects of Biogas Slurry Combined With Chemical Fertilizer on Soil Bacterial and Fungal Community Composition in a Paddy Field

2021 ◽  
Vol 12 ◽  
Author(s):  
Hanlin Zhang ◽  
Shuangxi Li ◽  
Xianqing Zheng ◽  
Juanqin Zhang ◽  
Naling Bai ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Bacterial Community ◽  
Fungal Community ◽  
Chemical Fertilizer ◽  
Community Diversity ◽  
Available Phosphorus ◽  
Biogas Slurry ◽  
Fungal Community Composition ◽  
Available Nitrogen ◽  
Bacterial Community Diversity

The application of biogas slurry and chemical fertilizer in paddy fields can be a practical method to reduce the environmental risk and utilize the nutrients of biogas slurry. The responses of bacterial and fungal communities to the application of biogas slurry and chemical fertilizer are important reflections of the quality of the ecological environment. In this study, based on a 3-year field experiment with different ratios of biogas slurry and chemical fertilizer (applying the same pure nitrogen amount), the Illumina MiSeq platform was used to investigate the bacterial and fungal community diversity and composition in paddy soil. Our results revealed that compared with the observations under regular chemical fertilization, on the basis of stable paddy yield, the application of biogas slurry combined with chemical fertilizer significantly enhanced the soil nutrient availability and bacterial community diversity and reduced the fungal community diversity. Dissolved organic carbon (DOC), DOC/SOC (soil organic carbon), available nitrogen (AN) and available phosphorus (AP) were positively correlated with the bacterial community diversity, but no soil property was significantly associated with the fungal community. The bacterial community was primarily driven by the application of biogas slurry combined with chemical fertilizer (40.78%), while the fungal community was almost equally affected by the addition of pure biogas slurry, chemical fertilizer and biogas slurry combined with chemical fertilizer (25.65–28.72%). Biogas slurry combined with chemical fertilizer significantly enriched Proteobacteria, Acidobacteria, Planctomycetes, Rokubacteria, and Ascomycota and depleted Chloroflexi, Bacteroidetes, Crenarchaeota, Basidiomycota, and Glomeromycota. The observation of the alteration of some bacteria- and fungus-specific taxa provides insights for the proper application of biogas slurry combined with chemical fertilizer, which has the potential to promote crop growth and inhibit pathogens.

scholarly journals Distribution diversity of fungi and bacteria communities in the pure plantation of Larix gmelinii and Fraxinus mandshurica

2020 ◽  
Author(s):  
Qing Yu Wei ◽  
Wei Li ◽  
Yulong Zhang ◽  
Xing Wei
Keyword(s):  
Bacterial Community ◽  
Relative Abundance ◽  
Fungal Community ◽  
Tree Species ◽  
Bacterial Communities ◽  
Rhizosphere Soil ◽  
Larch Forest ◽  
Community Diversity ◽  
Fraxinus Mandshurica ◽  
Bacterial Community Diversity

Abstract BackgroundLarix gmelinii （larch）and Fraxinus mandshurica （ash）are two important tree species in northeast China and are infected by Ectomycorrhizal fungi and arbuscular mycorrhizal fungi, respectively.MethodUsing the high-throughput sequencing method, we analyzed the composition of Fungi and bacterial communities in the roots, Rhizosphere, and Non-rhizosphere soil of 21-year-old larch and ash pure plantations. Furthermore, we also analyzed the impact of soil environmental factors on the Fungi and bacterial community diversity according to soil nutrition. ResultsThere were differences in the fungal community diversity between larch and ash. Ascomycota increased gradually from the larch root to non-rhizosphere soil, whereas Streplophyta decreased sharply from the larch root to non-rhizosphere soil. However, the trend of Basidiomycota and Streplophyta under the ash forest was opposite to that of the larch. At the same time, it was found that Larix , Pyronemataceae _Unclassified, Cenococcum , and Ulmus were endemic to larch, whereas Anemone and Monographella were endemic to ash. The bacteria were similar under larch and ash forest. Proteobacteria decreased gradually from rhizosphere to non-rhizosphere soil, and the relative abundance of Acidobacteria , Actinobacteria , Chloroflexi , Rokubacteria , Gemmatimonadetes , Firmicutes, and Nitrospirae were the lowest in the roots of the two species. Pseudomonas , one of the Plant Growth-Promoting Rhizobacteria（PGPR）, had high relative abundance in the roots of the two tree species. The fungal and bacterial communities in the root, rhizosphere soil, and non-rhizosphere soil of the same tree species were different. The distribution diversity of the fungal and bacterial community of larch was non-rhizosphere soil > rhizosphere soil > root. The bacterial community diversity of the ash rhizosphere soil was the highest, whereas the fungal community diversity in the root was the highest. The Larix , the special fungus in the larch, were mainly distributed in the root and decreased sharply outside the root. The Pyronemataceae _Unclassified, Cenococcum, and Ulmus were mainly distributed in the rhizosphere soil. The special fungi of ash were mainly distributed in the rhizosphere. Burkholderiaceae -Unclassified, one of the PGPR, was mainly distributed in the roots of larch, but it was the opposite in the ash. Bacillus and Paenibacillus existed widely in the rhizosphere soil of ash. However, the abundance of Paenibacillus in larch was low, and it gradually increased from the root to the outside. The relative abundance of Streptomycetaceae _Unclassified was slightly high in the larch non-rhizosphere soil and ash rhizosphere soil. There was a correlation between PGPR and some fungi under the two tree species. Among them, Bacillus had a significant synergistic effect with Mortierella and Mucor under larch forest. There was a positive correlation between total nitrogen and bacteria in rhizosphere soil under larch forest, and its content was significantly higher than that of other treatments. There was a positive correlation between total phosphorus and fungi in ash rhizosphere soil, and the content was significantly lower than that in non-rhizosphere soil. However, the relationship between soil fungi and bacteria to soil nutrients was not significant.ConclusionTherefore, compared with the bacterial community, endomycorrhizal tree species have greater differences in the fungal community. The diversity of fungal and bacterial communities in ectomycorrhizal trees increase from rhizosphere soil to non-rhizosphere soil, while the diversity of fungal communities in endomycorrhizal trees is the highest in roots.

Bacterial community diversity of yak milk dreg collected from Nyingchi region of Tibet, China

LWT ◽  
2021 ◽  
pp. 111308
Author(s):  
Fumin Chi ◽  
Zhankun Tan ◽  
Xuedong Gu ◽  
Lin Yang ◽  
Zhang Luo
Keyword(s):  
Bacterial Community ◽  
Community Diversity ◽  
Yak Milk ◽  
Bacterial Community Diversity

scholarly journals Phyllosphere community assembly and response to drought stress on common tropical and temperate forage grasses

2021 ◽  
Author(s):  
Emily K. Bechtold ◽  
Stephanie Ryan ◽  
Sarah E. Moughan ◽  
Ravi Ranjan ◽  
Klaus Nüsslein
Keyword(s):  
Microbial Community ◽  
Drought Stress ◽  
Bacterial Community ◽  
Community Assembly ◽  
Community Diversity ◽  
Grass Species ◽  
Severe Drought ◽  
Hormone Production ◽  
Plant Host ◽  
Bacterial Community Diversity

Grasslands represent a critical ecosystem important for global food production, soil carbon storage, and water regulation. Current intensification and expansion practices add to the degradation of grasslands and dramatically increase greenhouse gas emissions and pollution. Thus, new ways to sustain and improve their productivity are needed. Research efforts focus on the plant-leaf microbiome, or phyllosphere, because its microbial members impact ecosystem function by influencing pathogen resistance, plant hormone production, and nutrient availability through processes including nitrogen fixation. However, little is known about grassland phyllospheres and their response to environmental stress. In this study, globally dominant temperate and tropical forage grass species were grown in a greenhouse under current climate conditions and drought conditions that mimic future climate predictions to understand if (i) plant host taxa influence microbial community assembly, (ii) microbial communities respond to drought stress, and (iii) phyllosphere community changes correlate to changes in plant host traits and stress-response strategies. Community analysis using high resolution sequencing revealed Gammaproteobacteria as the dominant bacterial class, which increased under severe drought stress on both temperate and tropical grasses while overall bacterial community diversity declined. Bacterial community diversity, structure, and response to drought were significantly different between grass species. This community dependence on plant host species correlated with differences in grass species traits, which became more defined under drought stress conditions, suggesting symbiotic evolutionary relationships between plant hosts and their associated microbial community. Further understanding these strategies and the functions microbes provide to plants will help us utilize microbes to promote agricultural and ecosystem productivity in the future.

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