Short-term effects of snow cover manipulation on soil bacterial diversity and community composition

2020 ◽  
Vol 741 ◽  
pp. 140454
Author(s):  
Yuzhi Ren ◽  
Li Zhang ◽  
Kaijun Yang ◽  
Zhijie Li ◽  
Rui Yin ◽  
...  
Keyword(s):  
Snow Cover ◽  
Bacterial Diversity ◽  
Community Composition ◽  
Soil Bacterial Diversity ◽  
Short Term ◽  
Soil Bacterial ◽  
Short Term Effects

scholarly journals How Do Soil Bacterial Diversity and Community Composition Respond under Recommended and Conventional Nitrogen Fertilization Regimes?

2020 ◽  
Vol 8 (8) ◽  
pp. 1193
Author(s):  
Sami Ullah ◽  
Ping He ◽  
Chao Ai ◽  
Shicheng Zhao ◽  
Wencheng Ding ◽  
...  
Keyword(s):  
Community Structure ◽  
Bacterial Diversity ◽  
Community Composition ◽  
Crop Yield ◽  
Black Soil ◽  
N Fertilization ◽  
Partial Least Square ◽  
Least Square ◽  
Soil Bacterial Diversity ◽  
Soil Bacterial

Shifts in soil bacterial diversity and community composition are suggested to be induced by elevated input of nitrogen (N) fertilization with implications for soil quality, and consequently production. In this study, we evaluated the impacts of recommended fertilization (RF) and conventional fertilization (CF) on soil chemical properties, crop yield, bacterial diversity, and community composition from two long-term experiments conducted in fluvo-aquic soil and black soil of China. Each site comprised of four treatments, i.e., RF N−, RF N+, CF N−, CF N+. No N fertilization was indicated by N− and N fertilization was indicated by N+. Across both sites, N fertilization significantly increased crop yield compared with no N fertilization and RF successfully enhanced crop yield over CF. Interestingly, the RF maintained bacterial diversity, while CF depressed bacterial diversity in the two soils. Microbial taxa performing important ecological roles such as order Rhodospirillales and Bacillales were significantly enhanced in the RF approach, while Rhizobiales declined under CF. Furthermore, the results of partial least square path modeling revealed that soil available phosphorus (AP) negatively affected bacterial diversity while it positively affected bacterial community structure in fluvo-aquic soils. In contrast, soil pH was positively linked with both bacterial diversity and community structure in black soil. Overall, our study demonstrated that RF is an environmentally friendly approach which not only maintained above ground plant productivity, but also preserved belowground microbial populations and important soil variables regulating bacterial communities varied in different soil types.

scholarly journals Effects of carbon nanotubes and derivatives of graphene oxide on soil bacterial diversity

2019 ◽  
Author(s):  
Christian Forstner ◽  
Thomas G. Orton ◽  
Peng Wang ◽  
Peter M. Kopittke ◽  
Paul G. Dennis
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Bacterial Diversity ◽  
Community Composition ◽  
Bacterial Community Composition ◽  
Alpha Diversity ◽  
High Concentration ◽  
Soil Bacterial Diversity ◽  
Functionalized Graphene Oxide ◽  
Soil Bacterial

AbstractCarbon nanotubes (CNTs), reduced graphene oxide (rGO) and ammonia-functionalized graphene oxide (aGO), are nanomaterials that possess varied and useful properties. However, following their use, their release into the environment is inevitable. While CNTs have been shown to influence soil bacterial diversity, albeit at very high concentration, the effects of rGO have only been examined using pure bacterial cultures, and those of aGO are unknown. Here, we investigated the effects of CNTs, rGO and aGO, at three time points (7, 14 and 30 days), and over a range of concentrations (1 ng, 1 µg and 1 mg kg dry soil-1), on soil bacterial diversity using 16S rRNA amplicon sequencing. Graphite was included to facilitate comparisons with a similar and naturally occurring carbon material, while the inclusion of GO allowed the effects of GO modification to be isolated. Bacterial community composition, but not alpha diversity, was altered by all treatments except the low GO, low rGO and high aGO treatments on day 14 only. In all cases, the nanomaterials led to shifts in community composition that were of similar magnitude to those induced by graphite and GO, albeit with differences in the taxa affected. Our study highlights that nanocarbon materials can induce changes in soil bacterial diversity, even at doses that are environmentally realistic.

scholarly journals The soil microbiomics of intact, degraded and partially-restored semi-arid succulent thicket (Albany Subtropical Thicket)

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12176
Author(s):  
Micaela Schagen ◽  
Jason Bosch ◽  
Jenny Johnson ◽  
Robbert Duker ◽  
Pedro Lebre ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Bacterial Diversity ◽  
Community Composition ◽  
Bacterial Community Composition ◽  
Microbial Community Composition ◽  
Complete Removal ◽  
Sequence Variant ◽  
Soil Bacterial Diversity ◽  
Starting Point ◽  
Soil Bacterial

This study examines the soil bacterial diversity in the Portulacaria afra-dominated succulent thicket vegetation of the Albany Subtropical Thicket biome; this biome is endemic to South Africa. The aim of the study was to compare the soil microbiomes between intact and degraded zones in the succulent thicket and identify environmental factors which could explain the community compositions. Bacterial diversity, using 16S amplicon sequencing, and soil physicochemistry were compared across three zones: intact (undisturbed and vegetated), degraded (near complete removal of vegetation due to browsing) and restored (a previously degraded area which was replanted approximately 11 years before sampling). Amplicon Sequence Variant (ASV) richness was similar across the three zones, however, the bacterial community composition and soil physicochemistry differed across the intact and degraded zones. We identified, via correlation, the potential drivers of microbial community composition as soil density, pH and the ratio of Ca to Mg. The restored zone was intermediate between the intact and degraded zones. The differences in the microbial communities appeared to be driven by the presence of plants, with plant-associated taxa more common in the intact zone. The dominant taxa in the degraded zone were cosmopolitan organisms, that have been reported globally in a wide variety of habitats. This study provides baseline information on the changes of the soil bacterial community of a spatially restricted and threatened biome. It also provides a starting point for further studies on community composition and function concerning the restoration of degraded succulent thicket ecosystems.

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