scholarly journals Relationships between soil physico-chemical properties and total viable bacterial counts in Sunderban mangrove forests, Bangladesh

2012 ◽  
Vol 21 (2) ◽  
pp. 169-175 ◽  
Author(s):  
Mohammad Zabed Hossain ◽  
Chaman Binta Aziz ◽  
Mihir Lal Saha
Keyword(s):  
Nitrogen Content ◽  
Total Nitrogen ◽  
Bacterial Communities ◽  
Chemical Properties ◽  
Total Nitrogen Content ◽  
Mangrove Forests ◽  
Bacterial Colony ◽  
Soil Bacterial Communities ◽  
Physico Chemical ◽  
Soil Bacterial

Although soil bacterial communities are one of the important biotic components that influence decomposition and nutrient mineralization in the terrestrial ecosystems, factors driving this biotic community in the Sunderban mangrove forests are not well studied. The present study examined the importance of soil physico?chemical properties in driving soil bacterial communities in the Sunderban mangrove forests, Bangladesh. Soils were collected from 12 locations under four sites, namely Koromjal, Kotka, Hironpoint, and Dublarchar of Sunderban forests. Results showed a large range of variation in total bacterial colony counts (7.65 × 104 ? 14.5 × 104 cfu/g soil), soil moisture (9.0 ? 27.0%), total nitrogen (0.057 ? 0.158%), available nitrogen (0.504 ? 2.016 ?g/g soil), soil salinity (20.99 ? 34.99 mg chloride/g soil), and organic carbon (0.460 ? 0.885%). Data of the present study revealed that the number of total viable bacterial count was significantly and positively correlated only with total nitrogen content in soil indicating that total nitrogen content is the major driving factor of bacterial communities in the Sunderban mangrove forest soils.DOI: http://dx.doi.org/10.3329/dujbs.v21i2.11515 Dhaka Univ. J. Biol. Sci. 21(2): 169-175, 2012 (July)

scholarly journals Impact of Maize–Mushroom Intercropping on the Soil Bacterial Community Composition in Northeast China

Agronomy ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1526
Author(s):  
Xiaoqin Yang ◽  
Yang Wang ◽  
Luying Sun ◽  
Xiaoning Qi ◽  
Fengbin Song ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Northeast China ◽  
Management Practice ◽  
Bacterial Community Composition ◽  
Soil Microbial Communities ◽  
Chemical Properties ◽  
Crop Productivity ◽  
Rrna Gene ◽  
Soil Bacterial Communities ◽  
Soil Bacterial

Conservative agricultural practices have been adopted to improve soil quality and maintain crop productivity. An efficient intercropping of maize with mushroom has been developed in Northeast China. The objective of this study was to evaluate and compare the effects of planting patterns on the diversity and structure of the soil bacterial communities at a 0–20 cm depth in the black soil zone of Northeast China. The experiment consisted of monoculture of maize and mushroom, and intercropping in a split-plot arrangement. The characteristics of soil microbial communities were performed by 16S rRNA gene amplicom sequencing. The results showed that intercropping increased soil bacterial richness and diversity compared with maize monoculture. The relative abundances of Acidobacteria, Chloroflexi, Saccharibacteria and Planctomycetes were significantly higher, whereas Proteobacteria and Firmicutes were lower in intercropping than maize monoculture. Redundancy analysis suggested that pH, NO3−-N and NH4+-N contents had a notable effect on the structure of the bacterial communities. Moreover, intercropping significantly increased the relative abundance of carbohydrate metabolism pathway functional groups. Overall, these findings demonstrated that intercropping of maize with mushroom strongly impacts the physical and chemical properties of soil as well as the diversity and structure of the soil bacterial communities, suggesting this is a sustainable agricultural management practice in Northeast China.

scholarly journals The effects of afforestation on soil bacterial communities in temperate grassland are modulated by soil chemical properties

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6147 ◽  
Author(s):  
Shu-Hong Wu ◽  
Bing-Hong Huang ◽  
Jian Gao ◽  
Siqi Wang ◽  
Pei-Chun Liao
Keyword(s):  
Bacterial Community ◽  
Bacterial Communities ◽  
Chemical Properties ◽  
Soil Chemical Properties ◽  
Soil Microbiome ◽  
Apparent Lack ◽  
Soil P ◽  
Soil Bacterial Communities ◽  
Abundant Otus ◽  
Soil Bacterial

Grassland afforestation dramatically affects the abiotic, biotic, and ecological function properties of the original ecosystems. Interference from afforestation might disrupt the stasis of soil physicochemical properties and the dynamic balance of microbiota. Some studies have suggested low sensitivity of soil properties and bacterial community to afforestation, but the apparent lack of a significant relationship is probably due to the confounding effects of the generalist habitat and rare bacterial communities. In this study, soil chemical and prokaryotic properties in a 30-year-old Mongolia pine (Pinus sylvestris var. mongolica Litv.) afforested region and adjacent grassland in Inner Mongolia were classified and quantified. Our results indicate that the high richness of rare microbes accounts for the alpha-diversity of the soil microbiome. Few OTUs of generalist (core bacteria) and habitat-specialist bacteria are present. However, the high abundance of this small number of OTUs governs the beta-diversity of the grassland and afforested land bacterial communities. Afforestation has changed the soil chemical properties, thus indirectly affecting the soil bacterial composition rather than richness. The contents of soil P, Ca2+, and Fe3+ account for differentially abundant OTUs such as Planctomycetes and subsequent changes in the ecologically functional potential of soil bacterial communities due to grassland afforestation. We conclude that grassland afforestation has changed the chemical properties and composition of the soil and ecological functions of the soil bacterial community and that these effects of afforestation on the microbiome have been modulated by changes in soil chemical properties.

scholarly journals Land-use changes influence soil bacterial communities in a meadow grassland in Northeast China

Solid Earth ◽  
2017 ◽  
Vol 8 (5) ◽  
pp. 1119-1129 ◽  
Author(s):  
Chengyou Cao ◽  
Ying Zhang ◽  
Wei Qian ◽  
Caiping Liang ◽  
Congmin Wang ◽  
...  
Keyword(s):  
Land Use ◽  
Bacterial Community ◽  
Bacterial Communities ◽  
Land Use Changes ◽  
Chemical Properties ◽  
Soil Bacterial Communities ◽  
Land Use Types ◽  
Soil Bacterial ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract. The conversion of natural grassland into agricultural fields is an intensive anthropogenic perturbation commonly occurring in semiarid regions, and this perturbation strongly affects soil microbiota. In this study, the influences of land-use conversion on the soil properties and bacterial communities in the Horqin Grasslands in Northeast China were assessed. This study aimed to investigate (1) how the abundances of soil bacteria changed across land-use types, (2) how the structure of the soil bacterial community was altered in each land-use type, and (3) how these variations were correlated with soil physical and chemical properties. Variations in the diversities and compositions of bacterial communities and the relative abundances of dominant taxa were detected in four distinct land-use systems, namely, natural meadow grassland, paddy field, upland field, and poplar plantation, through the high-throughput Illumina MiSeq sequencing technique. The results indicated that land-use changes primarily affected the soil physical and chemical properties and bacterial community structure. Soil properties, namely, organic matter, pH, total N, total P, available N and P, and microbial biomass C, N, and P, influenced the bacterial community structure. The dominant phyla and genera were almost the same among the land-use types, but their relative abundances were significantly different. The effects of land-use changes on the structure of soil bacterial communities were more quantitative than qualitative.

scholarly journals Soil bacterial community and functional shifts in response to altered snowpack in moist acidic tundra of northern Alaska

SOIL ◽  
2016 ◽  
Vol 2 (3) ◽  
pp. 459-474 ◽  
Author(s):  
Michael P. Ricketts ◽  
Rachel S. Poretsky ◽  
Jeffrey M. Welker ◽  
Miquel A. Gonzalez-Meler
Keyword(s):  
Climate Change ◽  
Bacterial Community ◽  
Bacterial Communities ◽  
Bacterial Community Structure ◽  
Chemical Properties ◽  
Winter Precipitation ◽  
Snow Accumulation ◽  
Soil Microbial ◽  
Soil Bacterial Communities ◽  
Soil Bacterial

Abstract. Soil microbial communities play a central role in the cycling of carbon (C) in Arctic tundra ecosystems, which contain a large portion of the global C pool. Climate change predictions for Arctic regions include increased temperature and precipitation (i.e. more snow), resulting in increased winter soil insulation, increased soil temperature and moisture, and shifting plant community composition. We utilized an 18-year snow fence study site designed to examine the effects of increased winter precipitation on Arctic tundra soil bacterial communities within the context of expected ecosystem response to climate change. Soil was collected from three pre-established treatment zones representing varying degrees of snow accumulation, where deep snow  ∼ 100 % and intermediate snow  ∼ 50 % increased snowpack relative to the control, and low snow ∼ 25 % decreased snowpack relative to the control. Soil physical properties (temperature, moisture, active layer thaw depth) were measured, and samples were analysed for C concentration, nitrogen (N) concentration, and pH. Soil microbial community DNA was extracted and the 16S rRNA gene was sequenced to reveal phylogenetic community differences between samples and determine how soil bacterial communities might respond (structurally and functionally) to changes in winter precipitation and soil chemistry. We analysed relative abundance changes of the six most abundant phyla (ranging from 82 to 96 % of total detected phyla per sample) and found four (Acidobacteria, Actinobacteria, Verrucomicrobia, and Chloroflexi) responded to deepened snow. All six phyla correlated with at least one of the soil chemical properties (% C, % N, C : N, pH); however, a single predictor was not identified, suggesting that each bacterial phylum responds differently to soil characteristics. Overall, bacterial community structure (beta diversity) was found to be associated with snow accumulation treatment and all soil chemical properties. Bacterial functional potential was inferred using ancestral state reconstruction to approximate functional gene abundance, revealing a decreased abundance of genes required for soil organic matter (SOM) decomposition in the organic layers of the deep snow accumulation zones. These results suggest that predicted climate change scenarios may result in altered soil bacterial community structure and function, and indicate a reduction in decomposition potential, alleviated temperature limitations on extracellular enzymatic efficiency, or both. The fate of stored C in Arctic soils ultimately depends on the balance between these mechanisms.

scholarly journals Land-use changes influence soil bacterial communities in a meadow grassland in Northeast China

2017 ◽  
Author(s):  
Chengyou Cao ◽  
Ying Zhang ◽  
Wei Qian ◽  
Caiping Liang ◽  
Congmin Wang ◽  
...  
Keyword(s):  
Land Use ◽  
Bacterial Community ◽  
Bacterial Communities ◽  
Land Use Changes ◽  
Chemical Properties ◽  
Soil Bacterial Communities ◽  
Land Use Types ◽  
Soil Bacterial ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract. The conversion of natural grassland into agricultural fields is an intensive anthropogenic perturbation commonly occurring in semi-arid regions, and this perturbation strongly affects soil microbiota. In this study, the influences of land-use conversion on the soil properties and bacterial communities in Horqin Grasslands in Northeast China were assessed. This study aimed to investigate (1) how the abundances of soil bacteria changed across land-use types; (2) how the structure of soil bacterial community was altered in each land-use type; and (3) how these variations were correlated with soil physical and chemical properties. The variations in diversities and compositions of bacterial communities and relative abundance of dominant taxa were detected in four distinct land-use systems, namely, natural meadow grassland, paddy field, upland field, and poplar plantation, through high-throughput Illumina MiSeq sequencing technique. Results indicated that land-use changes primarily affected soil physical and chemical properties and bacterial community structure. Soil properties, namely, organic matter, pH, total N, total P, available N and P, and microbial biomass C, N, and P, influenced the bacterial community structure. The dominant phyla and genera were almost the same among the land-use types, but their relative abundances were significantly different. The effects of land-use changes on the structure of soil bacterial communities were more quantitative than qualitative.

scholarly journals Using soil bacterial communities to predict physico-chemical variables and soil quality

Microbiome ◽  
2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Syrie M. Hermans ◽  
Hannah L. Buckley ◽  
Bradley S. Case ◽  
Fiona Curran-Cournane ◽  
Matthew Taylor ◽  
...  
Keyword(s):  
Soil Quality ◽  
Bacterial Communities ◽  
Soil Bacterial Communities ◽  
Physico Chemical ◽  
Soil Bacterial

scholarly journals Soil bacterial community and functional shifts in response to thermal insulation in moist acidic tundra of Northern Alaska

2016 ◽  
Author(s):  
M. P. Ricketts ◽  
R. S. Poretsky ◽  
J. M. Welker ◽  
M. A. Gonzalez-Meler
Keyword(s):  
Climate Change ◽  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Communities ◽  
Bacterial Community Structure ◽  
Chemical Properties ◽  
Winter Precipitation ◽  
Snow Accumulation ◽  
Soil Bacterial Communities ◽  
Soil Bacterial

Abstract. Soil microbial communities play a central role in the cycling of carbon (C) in Arctic tundra ecosystems, which contain a large portion of the global C pool. Climate change predictions for Arctic regions include increased temperature and precipitation (i.e. more or less snow), resulting in increased winter soil insulation, increased soil temperature and moisture, and shifting plant community composition. We utilized an 18-year snowfence study site designed to examine the effects of increased winter precipitation on Arctic tundra soil bacterial communities within the context of ecosystem response to climate change. Soil was collected from three pre-established treatment zones representing varying degrees of snow accumulation (DEEP, INT, LOW), soil physical properties (temperature, moisture, active layer thaw depth) were measured, and samples were analysed for C content, nitrogen (N) content, and pH. DNA was extracted and the 16S rRNA gene was sequenced to reveal phylogenetic community differences between samples and determine how soil bacterial communities might respond (structurally and functionally) to changes in winter precipitation and soil chemistry. We analysed relative abundance changes of the six most abundant phyla and found four (Acidobacteria, Actinobacteria, Verrucomicrobia, and Chloroflexi) responded to deepened snow. All six phyla correlated with at least one of the soil chemical properties (%C, %N, C:N, pH), however a single predictor was not identified suggesting that each bacterial phylum responds differently to soil characteristics. Overall bacterial community structure (beta diversity) was found to be associated with snow accumulation treatment and all soil chemical properties. Bacterial functional potential was inferred using ancestral state reconstruction to approximate functional gene abundance, revealing a decreased abundance of genes required for soil organic matter (SOM) decomposition in the organic horizon of the deep snow accumulation zones. These results suggest that predicted climate change scenarios may result in altered soil bacterial community structure and function, and indicate either a reduction in decomposition potential that may limit C loss from the system, or alleviated temperature limitations on enzymatic efficiency, or both. The fate of stored C in Arctic soils ultimately depends on the balance between these mechanisms.

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