Effect of root exudates of Eucalyptus urophylla and Acacia mearnsii on soil microbes under simulated warming climate conditions

Abstract Background Recent studies demonstrated that warming and elevated carbon dioxide (CO2) indirectly affect the soil microbial community structure via plant root exudates. However, there is no direct evidence for how the root exudates affect soil microbes and how the compositions of root exudates respond to climate change. Results The results showed that warming directly decreased biomass of soil-borne bacteria and fungi for Acacia mearnsii De Willd but it did not impact soil microbial community for Eucalyptus urophylla S.T. Blake. In contrast, elevated CO2 had strong direct effect on increasing soil microbial biomass for both plant species. However, plant roots could significantly increase the secretion of antibacterial chemicals (most probable organic acids), which inhibited the growth of bacteria and fungi in elevated CO2 environment. This inhibitory effect neutralized the facilitation from increasing CO2 concentration on microbial growth. Conclusions We concluded that climate change can directly affect microorganisms, and indirectly affect the soil microbial community structure by changes in composition and content of plant root exudates.

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Assessment of Soil Microbial Community Structure by Use of Taxon-Specific Quantitative PCR Assays

Applied and Environmental Microbiology ◽

10.1128/aem.71.7.4117-4120.2005 ◽

2005 ◽

Vol 71 (7) ◽

pp. 4117-4120 ◽

Cited By ~ 819

Author(s):

Noah Fierer ◽

Jason A. Jackson ◽

Rytas Vilgalys ◽

Robert B. Jackson

Keyword(s):

Community Structure ◽

Microbial Community ◽

Quantitative Pcr ◽

Microbial Community Structure ◽

Soil Microbial Community ◽

Soil Microbial Community Structure ◽

Soil Microbial ◽

Pcr Assays ◽

Bacteria And Fungi ◽

Taxonomic Groups

ABSTRACT Here we describe a quantitative PCR-based approach to estimating the relative abundances of major taxonomic groups of bacteria and fungi in soil. Primers were thoroughly tested for specificity, and the method was applied to three distinct soils. The technique provides a rapid and robust index of microbial community structure.

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Which of soil microbes is in positive correlation to yields of maize (Zea mays L.)?

Plant Soil and Environment ◽

10.17221/590/2017-pse ◽

2017 ◽

Vol 63 (No. 12) ◽

pp. 574-580 ◽

Cited By ~ 3

Author(s):

Ma Zhongyou ◽

Xie Yue ◽

Zhu Lin ◽

Cheng Liang ◽

Xiao Xin ◽

...

Keyword(s):

Community Structure ◽

Microbial Community ◽

Microbial Community Structure ◽

Soil Microbial Community ◽

Soil Microbes ◽

Organic Fertilizer ◽

Soil Microbial Community Structure ◽

Positive Correlation ◽

Soil Microbial ◽

Maize Yields

Soil microorganisms are critical to maintain soil function, enhance plant health and increase crop yields. This study investigated the effects of organic matter on soil microbial community and assessed which of soil microbes were in positive correlation to maize yields. The results showed that different fertilizer treatments shaped specific microbial communities in the same soils. The most abundant beneficial soil microbes were found in treatments with organic fertilizer produced from cattle manure, return of wheat straw and 70% NPK admixture fertilizers treatment. The correlation analysis revealed that maize yields were in no correlation both to the shifts of soil microbial community structure and to the number of sequences or operational taxonomic units (OTUs) in soil microbes. However, maize yields were in positive correlation to microbial community structure shifts at the species level. 35 bacteria OTUs from 19 orders in 14 classes in 9 phyla were in positive correlation to yields of maize, while in fungi only one OTU<sub>25</sub> belonging to Sordariales was in positive correlation. Our results indicate that the long-term application of organic and inorganic amendments could enrich the soil bacterial and fungal community and promote its diversity.

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Alpine soil microbial community structure and diversity are largely influenced by moisture content in the Zoige wetland

International Journal of Environmental Science and Technology ◽

10.1007/s13762-021-03287-1 ◽

2021 ◽

Author(s):

S. Fan ◽

J. Qin ◽

H. Sun ◽

Z. Jia ◽

Y. Chen

Keyword(s):

Community Structure ◽

Microbial Community ◽

Moisture Content ◽

Microbial Community Structure ◽

Soil Microbial Community ◽

Soil Microbial Community Structure ◽

Soil Microbial ◽

Alpine Soil ◽

Zoige Wetland

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Field-scale studies on the change of soil microbial community structure and functions after stabilization at a chromium-contaminated site

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2021.125727 ◽

2021 ◽

Vol 415 ◽

pp. 125727

Author(s):

Danni Li ◽

Guanghe Li ◽

Dayi Zhang

Keyword(s):

Community Structure ◽

Microbial Community ◽

Microbial Community Structure ◽

Soil Microbial Community ◽

Contaminated Site ◽

Field Scale ◽

Soil Microbial Community Structure ◽

Soil Microbial ◽

Structure And Functions

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Changes in Bacterial and Fungal Soil Communities in Long-Term Organic Cropping Systems

Agriculture ◽

10.3390/agriculture11050445 ◽

2021 ◽

Vol 11 (5) ◽

pp. 445

Author(s):

Jessica Cuartero ◽

Onurcan Özbolat ◽

Virginia Sánchez-Navarro ◽

Marcos Egea-Cortines ◽

Raúl Zornoza ◽

...

Keyword(s):

Microbial Community ◽

Crop Yield ◽

Soil Microbial Community ◽

Cropping Systems ◽

Sequencing Analysis ◽

Soil Microbial Community Structure ◽

Soil Microbial ◽

Network Analyses ◽

Organic Cultivation

Long-term organic farming aims to reduce synthetic fertilizer and pesticide use in order to sustainably produce and improve soil quality. To do this, there is a need for more information about the soil microbial community, which plays a key role in a sustainable agriculture. In this paper, we assessed the long-term effects of two organic and one conventional cropping systems on the soil microbial community structure using high-throughput sequencing analysis, as well as the link between these communities and the changes in the soil properties and crop yield. The results showed that the crop yield was similar among the three cropping systems. The microbial community changed according to cropping system. Organic cultivation with manure compost and compost tea (Org_C) showed a change in the bacterial community associated with an improved soil carbon and nutrient content. A linear discriminant analysis effect size showed different bacteria and fungi as key microorganisms for each of the three different cropping systems, for conventional systems (Conv), different microorganisms such as Nesterenkonia, Galbibacter, Gramella, Limnobacter, Pseudoalteromonas, Pantoe, and Sporobolomyces were associated with pesticides, while for Org_C and organic cultivation with manure (Org_M), other types of microorganisms were associated with organic amendments with different functions, which, in some cases, reduce soil borne pathogens. However, further investigations such as functional approaches or network analyses are need to better understand the mechanisms behind this behavior.

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Effects of Short-Term Rice Straw Return on the Soil Microbial Community

Agriculture ◽

10.3390/agriculture11060561 ◽

2021 ◽

Vol 11 (6) ◽

pp. 561

Author(s):

Enze Wang ◽

Xiaolong Lin ◽

Lei Tian ◽

Xinguang Wang ◽

Li Ji ◽

...

Keyword(s):

Microbial Community ◽

Rice Straw ◽

Paddy Soil ◽

Soil Microbial Community ◽

Short Term ◽

Soil Microbial ◽

Microbial Network ◽

Straw Return ◽

Bacteria And Fungi ◽

Main Factor

Rice straw is a byproduct of agricultural production and an important agricultural resource. However, rice straw has not yet been effectively used, and incorrect treatment methods (such as burning in the field) can cause serious damage to the environment. Studies have shown that straw returning is beneficial to soil, but there have been few studies focused on the effect of the amount of short-term straw returned on the soil microbial community. This study evaluates 0%, 50%, 75%, and 100% rice straw returned to the field on whether returning different amounts of straw in the short term would affect the diversity and composition of the soil microbial community and the correlation between bacteria and fungi. The results show that the amount of straw returned to the field is the main factor that triggers the changes in the abundance and composition of the microbial community in the paddy soil. A small amount of added straw (≤ 50% straw added) mainly affects the composition of the bacterial community, while a larger amount of added straw (> 50% straw added) mainly affects the composition of the fungal community. Returning a large amount of straw increases the microbial abundance related to carbon and iron cycles in the paddy soil, thus promoting the carbon and iron cycle processes to a certain extent. In addition, network analysis shows that returning a large amount of straw also increases the complexity of the microbial network, which may encourage more microbes to be niche-sharing and comprehensively improve the ecological environment of paddy soil. This study may provide some useful guidance for rice straw returning in northeast China.

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