scholarly journals Moso Bamboo Invasion Reshapes Community Structure of Denitrifying Bacteria in Rhizosphere of Alsophila spinulosa

2022 ◽  
Vol 10 (1) ◽  
pp. 180
Author(s):  
Youwei Zuo ◽  
Huanhuan Qu ◽  
Changying Xia ◽  
Huan Zhang ◽  
Jiahui Zhang ◽  
...  
Keyword(s):  
Nitrogen Cycling ◽  
Root Biomass ◽  
Natural Habitat ◽  
Denitrifying Bacteria ◽  
Moso Bamboo ◽  
Phyllostachys Pubescens ◽  
Importance Value ◽  
Available Nitrogen ◽  
Growth And Survival ◽  
Abundance And Diversity

The uncontrolled invasion of moso bamboo (Phyllostachys pubescens) dramatically alters soil nitrogen cycling and destroys the natural habitat of Alsophila spinulosa. Nevertheless, no clear evidence points out the role of denitrifying bacteria in the invasion of bamboo into the habitat of A. spinulosa. In the present study, we found that low (importance value 0.0008), moderate (0.6551), and high (0.9326) bamboo invasions dramatically altered the underground root biomass of both P. pubescens and A. spinulosa. The root biomass of A. spinulosa was maximal at moderate invasion, indicating that intermediate disturbance might contribute to the growth and survival of the colonized plant. Successful bamboo invasion significantly increased rhizospheric soil available nitrogen content of A. spinulosa, coupled with elevated denitrifying bacterial abundance and diversity. Shewanella, Chitinophaga, and Achromobacter were the primary genera in the three invasions, whereas high bamboo invasion harbored more denitrifying bacteria and higher abundance than moderate and low invasions. Further correlation analysis found that most soil denitrifying bacteria were positively correlated with soil organic matter and available nitrogen but negatively correlated with pH and water content. In addition, our findings illustrated that two denitrifying bacteria, Chitinophaga and Sorangium, might be essential indicators for evaluating the effects of bamboo invasion on the growth of A. spinulosa. Collectively, this study found that moso bamboo invasion could change the nitrogen cycling of colonized habitats through alterations of denitrifying bacteria and provided valuable perspectives for profound recognizing the invasive impacts and mechanisms of bamboo expansion.

scholarly journals Nitrate Reducing and Denitrifying Bacteria in Oil/Brine Contaminated Soils

2020 ◽  
pp. 699-705
Author(s):  
Samer AbuBakr
Keyword(s):  
Crude Oil ◽  
Nitrogen Cycling ◽  
Contaminated Soils ◽  
Denitrifying Bacteria ◽  
Nitrite Reduction ◽  
Contaminated Sites ◽  
N2o Emissions ◽  
N Fixation ◽  
Soil Ecosystem ◽  
Available Nitrogen

Soil microorganisms are a fundamental part of biogeochemical cycling of nitrogen. Denitrification is an important component of nitrogen cycling, in which some microorganisms (e.g. denitrifying bacteria) use nitrate or nitrite as alternative electron acceptors. In fact, several studies have focused on various aspects of nitrogen cycling. Philippot et al. (2009) linked the distribution of the fraction of bacteria with the genetic capacity to reduce N2O to N2 to areas with low potential N2O emissions in a pasture. In addition, it was shown that a map of denitrification activity across a whole farm was reflected by maps displaying the community size and structure of a specific fraction of the denitrifyers at the site (Enwall et al., 2010). Since denitrification releases mineralized nitrogen in the soil ecosystem to the atmosphere, the balance between denitrification and N-fixation can determine the biologically available nitrogen for soils. Denitrification could be affected by soil ecosystem contaminants such as crude oil and brine as they may alter the abundance and species composition of denitrifying bacteria in predictable ways. For example, γ-Proteobacteria are known to increase in crude-oil contaminated sites and in fact, a wide diversity of γ-Proteobacteria including Pseudomonas and Vibrio species were shown to degrade hydrocarbons under nitrate reducing (NR) conditions (Rockne et al., 2000). Other studies showed that strains for several genera of γ-Proteobacteria have the ability to denitrify. In fact, it was shown that nitrate and nitrite reduction rates were increasingly inhibited at increasing NaCl concentrations when comparing treatment of fishery wastewaters. Bacterial diversity in brine-contaminated sites is expected to be less because of selection for salt-tolerant genera such as Bacillus and Pseudomonas.

scholarly journals The Abundance and Diversity of Grasshopper (Orthoptera) in Batu City, East Java

2021 ◽  
Vol 9 (1) ◽  
pp. 19-26
Author(s):  
Mufti Abrori ◽  
Amin Setyo Leksono ◽  
zulfaidah Penata Gama
Keyword(s):  
Negative Impact ◽  
Diversity Index ◽  
Abiotic Factors ◽  
Natural Habitat ◽  
Ecological Factors ◽  
Importance Value Index ◽  
Importance Value ◽  
Grasshopper Species ◽  
Wiener Diversity Index ◽  
Abundance And Diversity

Grasshoppers belong to the order Orthoptera in the insect class. The Orthoptera order is divided into two major suborders, namely Ensifera and Caelifera. Most grasshopper species play a role as herbivores and are a good source of protein for other animals The abundance and diversity of grasshoppers are more stable in an ecosystem with less disturbance and vice versa. The factors that influence the diversity of grasshoppers include ecological factors such as vegetation structure, atmospheric temperature, relative humidity. This study aims to analyze the abundance and diversity of grasshopper communities (Orthoptera) in Batu City, East Java. There are four research locations, namely Tahura R. Soerjo Cangar, Sumbergondo Village, Coban Talun, Junrejo District. Measurement of biotic and abiotic factors in grasshopper habitat (orthoptera), data analysis using the Shannon Wiener diversity index (H'), Importance Value Index (IVI), and biplot analysis. The results showed that the total number of grasshoppers in the ecosystem found was 754 individuals divided into 11 species, 2 families, and 7 subfamilies from Caelifera. Meanwhile, 201 individuals were found in the type of Ensifera, which were divided into 4 species from 2 families and 2 subfamilies. This study concludes that the species diversity of grasshoppers in several ecosystems in Batu City in the suborder Caelifera with the highest diversity is at the Junrejo location. Whereas in the suborder Ensifera the highest diversity was in the Sumbergondo location. The vegetation area has an influence on the diversity of grasshoppers both from the two suborders. The reduction in natural habitat for grasshoppers due to a large number of land uses by humans also has a negative impact on the sustainability of grasshoppers. Environmental factors affect the abundance and diversity of insects including grasshoppers, the response of each type of grasshopper to environmental characteristics affects their existence in a habitat.

scholarly journals Anti-fungal activity of moso bamboo (Phyllostachys pubescens) leaf extract and its development into a botanical fungicide to control pepper phytophthora blight

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Min Liao ◽  
Xuexiang Ren ◽  
Quan Gao ◽  
Niuniu Liu ◽  
Feng Tang ◽  
...  
Keyword(s):  
Leaf Extract ◽  
Active Component ◽  
Synergistic Effects ◽  
Moso Bamboo ◽  
Phyllostachys Pubescens ◽  
Phytophthora Blight ◽  
Edible Plant ◽  
Fungal Activity ◽  
Anti Fungal ◽  
Pepper Phytophthora Blight

AbstractMoso bamboo (Phyllostachys pubescens, Gramineae) is a well-known medicinal and edible plant found in China with various bioactivities, but few systematic studies address the utilization of its anti-fungal activity. The extract of moso bamboo leaf showed good anti-fungal activity to Phytophthora capsici, Fusarium graminearum, Valsa mali Miyabe et Yamada, Botryosphaeria dothidea, Venturia nashicola, and Botrytis cinerea Pers, with inhibitory rate of 100.00%, 75.12%, 60.66%, 57.24%, 44.62%, and 30.16%, respectively. Anti-fungal activity was different by the difference of samples picking time and location. The extract showed good synergistic effects with carbendazim at the ratios of 9:1 and 15:1 (extract : carbendazim), and the co-toxicity coefficients were 124.4 and 139.95. Compound 2 was isolated and identified as the main active component, with the EC50 value of 11.02 mg L−1. Then, the extract was formulated as a 10% emulsion in water, which was stable and had no acute toxic effects. Moreover, a field trial about this formulation was assayed to control pepper phytophthora blight, with the control effect of 85.60%. These data provided a better understanding of the anti-fungal activity and relevant active component of moso bamboo leaf extract. Taken together, our findings illustrated that bamboo leaf extract could be developed and utilized as a botanical fungicide or fungicide adjuvant.

scholarly journals Water Resistance and Creep Behavior of Heat-Treated Moso Bamboo Determined by the Stepped Isostress Method

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1264
Author(s):  
Teng-Chun Yang ◽  
Tung-Lin Wu ◽  
Chin-Hao Yeh
Keyword(s):  
Heat Treatment ◽  
Water Absorption ◽  
Creep Behavior ◽  
Heat Treatment Temperature ◽  
Water Resistance ◽  
Absorption Efficiency ◽  
Treatment Temperature ◽  
Moso Bamboo ◽  
Phyllostachys Pubescens ◽  
Heat Treated

The influence of heat treatment on the physico-mechanical properties, water resistance, and creep behavior of moso bamboo (Phyllostachys pubescens) was determined in this study. The results revealed that the density, moisture content, and flexural properties showed negative relationships with the heat treatment temperature, while an improvement in the dimensional stability (anti-swelling efficiency and anti-water absorption efficiency) of heat-treated samples was observed during water absorption tests. Additionally, the creep master curves of the untreated and heat-treated samples were successfully constructed using the stepped isostress method (SSM) at a series of elevated stresses. Furthermore, the SSM-predicted creep compliance curves fit well with the 90-day full-scale experimental data. When the heat treatment temperature increased to 180 °C, the degradation ratio of the creep resistance (rd) significantly increased over all periods. However, the rd of the tested bamboo decreased as the heat treatment temperature increased up to 220 °C.

MICROSTRUCTURE ANALYSIS OF MOSO BAMBOO (Phyllostachys pubescens MAZEL) SURFACE AFTER UV RADIATION

2019 ◽  
Vol 27 (01) ◽  
pp. 1950090
Author(s):  
HAIXIA YU ◽  
XIN PAN ◽  
WEIMING YANG ◽  
WENFU ZHANG ◽  
XIAOWEI ZHUANG
Keyword(s):  
Uv Radiation ◽  
Cell Walls ◽  
Uv Light ◽  
Parenchyma Cell ◽  
Moso Bamboo ◽  
Thick Wall ◽  
Phyllostachys Pubescens ◽  
Thin Wall ◽  
Intercellular Spaces ◽  
Parenchyma Cell Walls

Bamboo material is widely used in outdoor applications. However, they are easily degraded when exposed to sunlight, their smooth surface will gradually turn to rough, and small cracks will appear and finally develop to large cracks. The paper presents a first-time investigation on the microstructure changes in the tangential section of Moso bamboo (Phyllostachys pubescens Mazel) radiated by artificial UV light. The results showed that the cracks mainly appeared at intercellular spaces of fibers where lignin content was high, the parenchyma cell walls and neighbor pits where the cell wall was very thin and more vulnerable than the other parts. In addition, the part of raised area and pit cavity tended to absorb more UV light radiation and showed more and larger cracks than the otherwhere. Cracks at the intercellular spaces of fibers were larger and bigger than those on the parenchyma cell walls. The cracks on the pits of the parenchyma cell walls normally appeared at one pit and then extended to the several surrounding pits. Bordered pits cavity showed more and larger cracks than the pits on the thin wall cells. The simple pits on the thick wall cells and the fiber cells were unaffected by UV radiation.

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