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Defining the Soil Texture-Based Microbial Community.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Defining the Soil Texture-Based Microbial Community./
Author:	Xia, Qing.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	188 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-02, Section: B.
Contained By:	Dissertations Abstracts International83-02B.
Subject:	Physiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28552506
ISBN:	9798522940560

Defining the Soil Texture-Based Microbial Community.
Xia, Qing.

Defining the Soil Texture-Based Microbial Community. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 188 p.

Source: Dissertations Abstracts International, Volume: 83-02, Section: B.

Thesis (Ph.D.)--North Carolina State University, 2021.

This item must not be sold to any third party vendors.

Soil texture is an essential component of soil survey for estimating potentials and limitations of land use and management. It has been appreciated as an important predictor for numerous soil processes. However, its connections with the diversity and composition of the soil microbial community at the heart of ecosystem services remain less understood. To help achieve adjustable and directable soil microbial functions via agricultural management, this work aimed to specify soil texture-based diversity, composition, and taxon interactions of the soil microbial community using marker-gene high throughput sequencing approaches. Soils of different textural classes were collected from variously managed turfgrass landscapes and crop fields and further subjected to laboratory manipulations to attain a wide spectrum of soil particle content, pore size distribution, water connectivity, and/or organic substance chemistry. Data supported that coarse-textured soil promoted fungal species richness and yet fine-textured soil boosted more even distribution of bacterial taxa. Filamentous bacteria, e.g., Actinobacteria were more associated with silt and clay fractions, whereas Betaproteobacteria was relatively more abundant in the sand fraction. Fusarium, a large genus of soil fungi with most species as saprophytes and some as pathogens, was preferred in the clay fraction. These texture-based bacterial and fungal distribution patterns were attributed to soil particle-directed locality of organic substance chemistry and pore size-mediated resource (e.g., water) connectivity. In addition, intra- and inter-kingdom associations of microbes appeared to be less in soils with more micropores ( 75 µm). Given that interactions, e.g., synergy and cooperation, are vital for microbes to secrete costly extracellular enzymes in a stoichiometric manner, texture-based soil enzyme activities and organic matter degradation were further elaborated. Results showed that both bacterial and fungal community structure was texturedependent, and the detailed pattern relied on texture-based substrate distribution and reaction conditions. This dissertation provided insights on texture-based microbial community structure and functions and proposed possible mechanisms. So far, predictions on soil microbial diversity and functions are still challenging and require more investigations on microbes in diverse ecosystems.

ISBN: 9798522940560Subjects--Topical Terms:

518431
Physiology.

Defining the Soil Texture-Based Microbial Community.
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506 $a This item must not be sold to any third party vendors.
520 $a Soil texture is an essential component of soil survey for estimating potentials and limitations of land use and management. It has been appreciated as an important predictor for numerous soil processes. However, its connections with the diversity and composition of the soil microbial community at the heart of ecosystem services remain less understood. To help achieve adjustable and directable soil microbial functions via agricultural management, this work aimed to specify soil texture-based diversity, composition, and taxon interactions of the soil microbial community using marker-gene high throughput sequencing approaches. Soils of different textural classes were collected from variously managed turfgrass landscapes and crop fields and further subjected to laboratory manipulations to attain a wide spectrum of soil particle content, pore size distribution, water connectivity, and/or organic substance chemistry. Data supported that coarse-textured soil promoted fungal species richness and yet fine-textured soil boosted more even distribution of bacterial taxa. Filamentous bacteria, e.g., Actinobacteria were more associated with silt and clay fractions, whereas Betaproteobacteria was relatively more abundant in the sand fraction. Fusarium, a large genus of soil fungi with most species as saprophytes and some as pathogens, was preferred in the clay fraction. These texture-based bacterial and fungal distribution patterns were attributed to soil particle-directed locality of organic substance chemistry and pore size-mediated resource (e.g., water) connectivity. In addition, intra- and inter-kingdom associations of microbes appeared to be less in soils with more micropores ( 75 µm). Given that interactions, e.g., synergy and cooperation, are vital for microbes to secrete costly extracellular enzymes in a stoichiometric manner, texture-based soil enzyme activities and organic matter degradation were further elaborated. Results showed that both bacterial and fungal community structure was texturedependent, and the detailed pattern relied on texture-based substrate distribution and reaction conditions. This dissertation provided insights on texture-based microbial community structure and functions and proposed possible mechanisms. So far, predictions on soil microbial diversity and functions are still challenging and require more investigations on microbes in diverse ecosystems.
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650 4 $a Biology. $3 522710
650 4 $a Microbiology. $3 536250
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650 4 $a Agronomy. $3 2122783
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