scholarly journals Soil Microbial Community Composition and Diversity Remained Unchanged in a Semiarid Grassland in Northwestern China After 7 Years of Nitrogen Addition

2021 ◽  
Author(s):  
Qian Guo ◽  
Zhongming Wen ◽  
Hossein Ghanizadeh ◽  
Cheng Zheng ◽  
Yongming Fan ◽  
...  
Keyword(s):  
Microbial Community ◽  
Soil Properties ◽  
Community Composition ◽  
Microbial Community Composition ◽  
N Deposition ◽  
Leaf Nitrogen Content ◽  
N Addition ◽  
Weighted Mean ◽  
Soil Microbial ◽  
Community Weighted Mean

Abstract Aims Nitrogen (N) deposition is a global environmental problem that can alter community compositions and functions, and consequently, the ecosystem services. In this study, we assessed the responses of aboveground vegetation, surface soil properties and microbial communities to N addition, and explored the drivers of microbial community in a semiarid steppe ecosystem in northwest of China. Methods Thirty-six 6×10-m2 plots composed of six N addition levels and six replicates were distributed in six columns and six rows. Nine vegetation characteristics and seven soil properties were measured and calculated. Soil microbial characteristics were analyzed by 16S rRNA high-throughput sequencing. Results N addition positively affected aboveground vegetation traits such as the community weighted-mean of leaf nitrogen content (LNCWM). High N inputs significantly altered the microbial community assembly process from random to deterministic. The microbial community diversity and composition, however, were not sensitive to N addition. A piecewise structural equation model (SEM) further showed that the microbial community composition was affected by both aboveground vegetation and soil properties. The composition of bacterial communities was mainly regulated by the composition of plant communities and soil total N. In contrast, the composition of fungal communities was driven by soil pH and the community weighted-mean of specific leaf area (SLACWM). Microbial diversity and composition remained unchanged because their drivers were not affected by N addition. The results of this research improved our understanding of the response of grassland ecosystems to N deposition, and provided a theoretical basis for grassland utilization and management under N deposition.

Volatile-mediated suppression of plant pathogens is related to soil properties and microbial community composition

2018 ◽  
Vol 117 ◽  
pp. 164-174 ◽  
Author(s):  
Maaike van Agtmaal ◽  
Angela L. Straathof ◽  
Aad Termorshuizen ◽  
Bart Lievens ◽  
Ellis Hoffland ◽  
...  
Keyword(s):  
Microbial Community ◽  
Soil Properties ◽  
Community Composition ◽  
Plant Pathogens ◽  
Microbial Community Composition

scholarly journals New Soil, Old Plants, and Ubiquitous Microbes: Evaluating the Potential of Incipient Basaltic Soil to Support Native Plant Growth and Influence Belowground Soil Microbial Community Composition

2018 ◽  
Author(s):  
Aditi Sengupta ◽  
Priyanka Kushwaha ◽  
Antonia Jim ◽  
Peter A. Troch ◽  
Raina Maier
Keyword(s):  
Microbial Community ◽  
Plant Growth ◽  
Community Composition ◽  
Plant Species ◽  
Soil Microbial Community ◽  
Soil Loss ◽  
Microbial Community Composition ◽  
Parent Material ◽  
Native Plant ◽  
Soil Microbial

The plant-microbe-soil nexus is critical in maintaining biogeochemical balance of the biosphere. However, soil loss and land degradation are occurring at alarmingly high rates, with soil loss exceeding soil formation rates. This necessitates evaluating marginal soils for their capacity to support and sustain plant growth. In a greenhouse study, we evaluated the capacity of marginal incipient basaltic parent material to support native plant growth, and the associated variation in soil microbial community dynamics. Three plant species, native to the Southwestern Arizona-Sonora region were tested with three soil treatments including basaltic parent material, parent material amended with 20% compost, and potting soil. The parent material with and without compost supported germination and growth of all the plant species, though germination was lower than the potting soil. A 16S rRNA amplicon sequencing approach showed Proteobacteria to be the most abundant phyla in both parent material and potting soil, followed by Actinobacteria. Microbial community composition had strong correlations with soil characteristics but not plant attributes within a given soil material. Predictive functional potential capacity of the communities revealed chemoheterotrophy as the most abundant metabolism within the parent material, while photoheterotrophy and anoxygenic photoautotrophy were prevalent in the potting soil. These results show that marginal incipient basaltic soil has the ability to support native plant species growth, and non-linear associations may exist between plant-marginal soil-microbial interactions.

scholarly journals Consistent predictors of microbial community composition across scales in grasslands reveal low context-dependency

2021 ◽  
Author(s):  
Dajana Radujković ◽  
Sara Vicca ◽  
Margaretha van Rooyen ◽  
Peter Wilfahrt ◽  
Leslie Brown ◽  
...  
Keyword(s):  
Microbial Community ◽  
Community Composition ◽  
Spatial Scales ◽  
Regional Scale ◽  
Microbial Community Composition ◽  
Soil Microbial Communities ◽  
Plant Productivity ◽  
Context Dependency ◽  
Fungal Community Composition ◽  
Soil Microbial

Environmental circumstances shaping soil microbial communities have been studied extensively, but due to disparate study designs it has been difficult to resolve whether a globally consistent set of predictors exists, or context-dependency prevails. Here, we used a network of 18 grassland sites (11 sampled across regional plant productivity gradients) to examine i) if the same abiotic or biotic factors predict both large- and regional-scale patterns in bacterial and fungal community composition, and ii) if microbial community composition differs consistently with regional plant productivity (low vs high) across different sites. We found that there is high congruence between predictors of microbial community composition across spatial scales; bacteria were predominantly associated with soil properties and fungi with plant community composition. Moreover, there was a microbial community signal that clearly distinguished high and low productivity soils that was shared across worldwide distributed grasslands suggesting that microbial assemblages vary predictably depending on grassland productivity.

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