CONTRASTIVE SOIL PROPERTIES, MICROBIAL STRUCTURE AND SOIL ENZYMES IN THE RHIZOSPHERE OF Scirpus triqueter AND BULK SOIL IN PETROLEUM-CONTAMINATED WETLAND

2018 ◽  
Vol 17 (7) ◽  
pp. 1701-1709 ◽  
Author(s):  
Xiaoyan Liu ◽  
Jing Wei ◽  
Chuanhua Wang ◽  
Xueping Chen ◽  
Xia Liang ◽  
...  
Keyword(s):  
Soil Properties ◽  
Soil Enzymes ◽  
Bulk Soil ◽  
Microbial Structure ◽  
Scirpus Triqueter

Vegetation alters how soil properties and climate influence microbial activity and functional diversity in rhizosphere and bulk soil along an elevation gradient

2021 ◽  
pp. 108485
Author(s):  
Daniel Hernández-Cáceres ◽  
Alexia Stokes ◽  
Guillermo Angeles-Alvarez ◽  
Josiane Abadie ◽  
Fabien Anthelme ◽  
...  
Keyword(s):  
Soil Properties ◽  
Microbial Activity ◽  
Functional Diversity ◽  
Elevation Gradient ◽  
Bulk Soil

Relationships between denitrification rate and determinant soil properties under barley

1993 ◽  
Vol 73 (4) ◽  
pp. 567-578 ◽  
Author(s):  
D. W. Bergstrom ◽  
E. G. Beauchamp
Keyword(s):  
Enzyme Activity ◽  
Moisture Content ◽  
Soil Properties ◽  
Respiration Rate ◽  
Denitrification Rate ◽  
Bulk Soil ◽  
Small Scale ◽  
Mean Values ◽  
Acetylene Blockage ◽  
A Site

To better understand environmental regulation of denitrification, we examined relationships between denitrification rate and six determinant soil properties: moisture content, air-filled porosity, NO3− content, respiration rate, mineralizable-C concentration and denitrifying enzyme activity (DEA). Soil cores were collected on 27 sampling dates over a growing season at a site seeded to barley (Hordeum vulgare). Denitrification rate was measured using a static core technique and acetylene blockage. Moisture content and air-filled porosity and, to a lesser extent, mineralizable-C concentration and respiration rate were more strongly related to denitrification rate than was DEA. Denitrification rate was unrelated to NO3− content. On most sampling dates, mean denitrification rate increased substantially only below an air-filled porosity of 0.3. Moreover, the distribution of individual measurements of denitrification rate was less skewed at lower air-filled porosities. Approximately 60% of variation in mean values of denitrification rate for each sampling date could be accounted for by measurements of bulk soil properties, of which moisture content and air-filled porosity were most important. Measurements of bulk soil properties did not account for nil values of denitrification rate at low air-filled porosities or for small-scale spatial variability. Such measurements were better indicators of temporal variation — that is, when denitrification occurred — than of actual rates. Key words: Denitrification, air-filled porosity, denitrifying enzyme activity

scholarly journals Hyperlocal Variation in Soil Iron and Rhizosphere Microbiome Determines Disease Development in Amenity Turfgrass

2020 ◽  
Author(s):  
Ming-Yi Chou ◽  
Smita Shrestha ◽  
Renee Rioux ◽  
Paul Koch
Keyword(s):  
Soil Properties ◽  
Bulk Soil ◽  
Controlled Environment ◽  
Rrna Gene ◽  
Disease Development ◽  
Dollar Spot ◽  
Rhizosphere Microbiome ◽  
Environment Chamber ◽  
Plant Pathosystems ◽  
Important Disease

ABSTRACTDollar spot, caused by the fungal pathogen Clarireedia spp., is an economically important disease of amenity turfgrass in temperate climates worldwide. This disease often occurs in a highly variable manner, even on a local scale with relatively uniform environmental conditions. The objective of this study was to investigate mechanisms behind this local variation, focusing on contributions of the soil and rhizosphere microbiome. Turfgrass, rhizosphere, and bulk soil samples were taken from within a 256 m2 area of healthy turfgrass, transported to a controlled environment chamber, and inoculated with C. jacksonii. Bacterial communities were profiled targeting the 16s rRNA gene, and 16 different soil chemical properties were assessed. Despite their initial uniform appearance, the samples differentiated into highly susceptible and moderately susceptible groups following inoculation in the controlled environment chamber. The highly susceptible samples harbored a unique rhizosphere microbiome with lower relative abundance of antibiotic-producing bacterial taxa and higher predicted abundance of genes associated with xenobiotic biodegradation pathways. In addition, stepwise regression revealed that bulk soil iron content was the only significant soil characteristic that positively regressed with decreased dollar spot susceptibility during the peak disease development stage. These findings suggest that localized variation in soil iron induces the plant to select for a particular rhizosphere microbiome that alters the disease outcome. More broadly, further research in this area may indicate how plot-scale variability in soil properties can drive variable plant disease development through alterations in the rhizosphere microbiome.IMPORTANCEDollar spot is the most economically important disease of amenity turfgrass, and more fungicides are applied targeting dollar spot than any other turfgrass disease. Dollar spot symptoms are small (3-5 cm), circular patches that develop in a highly variable manner within plot-scale even under seemingly uniform conditions. The mechanism behind this variable development is unknown. This study observed that differences in dollar spot development over a 256 m2 area were associated with differences in bulk soil iron concentration and correlated with a particular rhizosphere microbiome. These findings provide important clues for understanding the mechanisms behind the highly variable development of dollar spot, which may offer important clues for innovative control strategies. Additionally, these results also suggest that small changes in soil properties can alter plant activity and hence the plant-associated microbial community which has important implications for a broad array of important agricultural and horticultural plant pathosystems.

scholarly journals Impact of Texture on Sesquioxide Distribution in Southeastern Nigerian Soils

2019 ◽  
Vol 8 (1) ◽  
pp. 43-58
Author(s):  
Bethel Uzoho ◽  
Nnaemeka Okoli ◽  
Ugochi Ekwugha
Keyword(s):  
Particle Size ◽  
Soil Properties ◽  
Flat Surface ◽  
Soil Particle ◽  
Bulk Soil ◽  
Size Fractions ◽  
Particle Size Fractions ◽  
Soil Particle Size ◽  
Soil Particle Size Fractions ◽  
The Impact

Sesquioxides which play significant roles in soil classification and dominant soil properties vary in soils with particle size fractions. Using randomized complete block design, this study was conducted in the month of June 2018 to evaluate the impact of texture on sesquioxide distribution in humid rainforest soils of Southeastern Nigeria.  Four mini-pedons were dug at four landscape positions (upslope, midslope, downslope and flat surface) and triplicate soil samples taken from 0-20, 20-40 and 40-60 cm depths, summing to total of 36 samples. Crystalline and amorphous Al, Fe, Mn and Si oxides were then determined at a depth of 0-20 cm using Dithionate Citrate Bicarbonate (DCB) and ammonium oxalate reagents. Dithionate and oxalate fractions in bulk soil ranged between 9300-11,400 (Fed), 390-1580 (Feox), 4600-6700 (Ald), 660-890 (Alox), 3300-5600 (Mnd), 350-580 (Mnox) and 9600-13,500 (Sid) and 1690-1790 mg kg-1 (Siox), with dithionate superior indicating high crystallinity and low mobility of the sesquioxides. Ratios of bulk soil oxalate/dithionate fractions were low and ranged between 0.04-0.17 (Feox/Fed), 0.11-0.15 (Alox/Ald), 0.10-0.16(Mnox/Mnd) and 0.13-0.18 (Siox/Sid) and confirming their crystallinity. Low Feox/Fed ratios signified that soils were well drained (< 0.35), old (< 0.65) and highly weathered (< 0.50) with the order being a decreasing sequence of upslope > flat surface > down slope > midslope. Sesquioxide contents and reactivity in soil particle size fractions (sand, silt and clay) varied with landscapes. Regression models indicated that particle size fractions accounted for 50% of 2/3rd of the bulk soil sesquioxide concentrations and that averaged over landscapes, sand fraction was more enriched with various sesquioxides than the other soil particle size fractions. Correlations between most bulk soil sesquioxide fractions and sesquioxide fractions with selected soil properties (sand, silt, clay, moisture content, total porosity, organic matter, pH, Ca and ECEC) were significant (P < 0.05). 

Effects of direct drilling and reduced cultivation on soil conditions for root growth

1973 ◽  
Vol 7 (4) ◽  
pp. 184-189 ◽  
Author(s):  
R Q Cannell ◽  
J R Finney
Keyword(s):  
Organic Matter ◽  
Root Growth ◽  
Mechanical Strength ◽  
Soil Properties ◽  
Structural Stability ◽  
Bulk Soil ◽  
Soil Conditions ◽  
Uncultivated Soil ◽  
Direct Drilling ◽  
Indirect Relationship

The two aspects of soil conditions and root growth in reduced cultivation systems are reviewed. Generally, an uncultivated soil is characterized by increased mechanical strength, reduced porosity greater moisture, more organic matter and structural stability at the surface, more earthworms and the development of nutrient gradients. Effects on root growth are much more variable and reflect the indirect relationship that exists between bulk soil properties and root growth.

scholarly journals Composition of Zingiber officinale Roscoe (Ginger), Soil Properties and Soil Enzyme Activities Grown in Different Concentration of Mineral Fertilizers

Horticulturae ◽  
2022 ◽  
Vol 8 (1) ◽  
pp. 43
Author(s):  
Dilfuza Jabborova ◽  
Ravish Choudhary ◽  
Abdulahat Azimov ◽  
Zafarjon Jabbarov ◽  
Samy Selim ◽  
...  
Keyword(s):  
Soil Properties ◽  
Soil Enzymes ◽  
Chemical Properties ◽  
Zingiber Officinale ◽  
Mineral Elements ◽  
Mineral Fertilizers ◽  
Soil Enrichment ◽  
Zingiber Officinale Roscoe ◽  
Ginger Rhizome ◽  
And Control

Ginger is rich in different chemical compounds such as phenolic compounds, terpenes, polysaccharides, lipids, organic acids, minerals, and vitamins. The present study investigated the effect of mineral fertilizers on the content of mineral elements in the rhizomes of Zingiber officinale Roscoe, soil enzymes activity, and soil properties in Surkhandarya Region, Uzbekistan. To the best of our knowledge, the present study is the first in Uzbekistan to investigate the mineral elements of ginger rhizome inhabiting Termez district, Surkhandarya region. A Field experiment was conducted at the Surkhandarya experimental station research Institute. Four treatments have been studied (Control with no fertilizers (T-1), N75P50K50 kg/ha (T-2), N125P100K100 kg/ha (T-3) and N100P75K75 + B3Zn6Fe6 kg/ha (T-4)). Results showed that T-4 treatment significantly increased ginger rhizome K, Ca, P, Mg, Fe, Na, Mn, Zn, Si, Li, and V content as compared to all other treatments and control. T-3 treatment significantly increased Mo, Ga, and Ag content in comparison to other treatments. Soil enzymes showed a significant increase for all treatments against control, while T-4 treatment has recorded the highest enzyme activity in comparison to all other treatments in urease, invertase, and catalase content. Soil chemical properties have significantly changed for all treatments against the non-cultivated soil and the zero fertilizers plantation with variation among different treatments. Results showed that ginger root is rich in minerals and can be used as a great potential for nutritional supplements and soil enrichment. This study suggest that combination of macro-microelements have the potential to increase the content of mineral elements in the rhizomes of ginger in field conditions.

scholarly journals Effects of living cover on the soil microbial communities and ecosystem functions of hazelnut orchard

2020 ◽  
Author(s):  
Wenxu Ma ◽  
Zhen Yang ◽  
Sihao Hou ◽  
Qinghua Ma ◽  
Lisong Liang ◽  
...  
Keyword(s):  
Community Structure ◽  
Soil Properties ◽  
Soil Enzymes ◽  
Soil Depth ◽  
Soil Microbial Communities ◽  
Ecosystem Functions ◽  
Rrna Gene ◽  
Organic Carbon Content ◽  
Microbial Function ◽  
Management Measure

Abstract Background: Living covers are an important management measure for orchards in China, which has a certain influence on soil properties, microorganisms and micro-ecological environment. However, there are few studies on the effects of living covers on the soil changes in hazelnut orchard. In this study, we compared living cover treatment by Vulpia myuros and no cover treatment, and analyzed the changes on the soil properties, microorganisms and microbial function by using high-throughput ITS rDNA and 16S rRNA gene Illumina sequencing. Results: The consequences demonstrated that the total organic carbon content of living cover treatment in the 20-40 cm soils increased by 32.87 % and 14.82 % respectively in May and July compared with no cover treatment, and living cover treatment by Vulpia myuros can also significantly increased the contents of total phosphorus (TP), total nitrogen (TN), available phosphorus (AP) and available potassium (AK) in the soil samples. Moreover, the influence of seasons is not as significant as that of soil depth. The living cover treatment significantly improved the soil enzymes activity levels. Among the four kind of soil enzymes, the soil invertase activity of living cover treatment was 50.94 % greater than that of no cover treatment in 0-20 cm soils and 52.17 % in 20-40 cm soils in May. The consequences demonstrated that Ascomycota, Mortierellomycota and Basidiomycota were the dominant fungal phylum in all samples, while Proteobacteria, Actinobacteria, Acidobacteria, Firmicutes and Chloroflexi were the dominant bacterial phylum, but different treatments impacted the composition of fungal and bacterial communities. Principal component analysis (PCA) showed that living cover with Vulpia myuros significantly changed the soil fungal community structure whereas the bacterial community structure may be more sensitive to seasonal changes. At the microbial functional level, the pathotrophs, saprotrophs and symbiotrophs accounted for approximately 36.69 %, 49.80 % and 2.59 % of no cover treatment fungal OTUs respectively whereas in living cover treatment was 19.76 %, 41.51 % and 6.89 %. Conclusions: According to this study, we believe that the living cover with Vulpia myuros has a favorable regulating influence on soil properties, microbial community and microbial function, and can be considered as a management measure for hazelnut orchards management.

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