scholarly journals Niche analysis of dominant species in alpine desert grassland communities in Qaidam Basin

2021 ◽  
Vol 257 ◽  
pp. 03021
Author(s):  
Jiancai Sun ◽  
Yonghui Li ◽  
Deting Deng ◽  
Sha Yang ◽  
Yukun Wu ◽  
...  
Keyword(s):  
Plant Communities ◽  
Dominant Species ◽  
Qaidam Basin ◽  
Chemical Properties ◽  
Niche Overlap ◽  
Desert Plant ◽  
Desert Grassland ◽  
Qinghai Province ◽  
Physical And Chemical ◽  
The Relationship

Community dominant plants and their ecological niche research is the focus of community ecology research. To explore the niche characteristics of desert dominant plants and the relationship between them and soil factors in Qaidam Basin, and to provide a basis for the construction of desert plant communities and the sustainable management of natural resources in Qaidam Basin. Taking 13 desert plant communities in Qaidam Basin, Qinghai Province as the research objects, this paper analyzed the characteristics of desert plant communities and dominant species based on soil physical and chemical properties, and calculated the niche width and niche overlap of dominant plants. The dominant plants are, Haloxylon ammodendron, Tamarix chinensis, Achnatherum splendens, Poacynum hendersonii, Reaumuria songonica, Phragmites australiss, Sympegma regelii, and Ajania Tenuifolia, Artemisia sphaerocephala, Ceratoides latens, Pearl russianthistle, Scirpustriquter. There were different degree of niche overlap among species in the community. In addition, CCA sequencing showed that different species had different requirements on the environment, and the distribution of dominant species was mainly affected by soil total nitrogen and soil organic matter.

THE INFLUENCE OF SOME PHYSICAL AND CHEMICAL PROPERTIES ON SOIL AGGREGATION AND RESPONSE TO VAMA

1966 ◽  
Vol 46 (2) ◽  
pp. 155-160 ◽  
Author(s):  
G. R. Saini ◽  
A. A. MacLean ◽  
J. J. Doyle
Keyword(s):  
Organic Matter ◽  
Soil Properties ◽  
Chemical Properties ◽  
Correlation Coefficients ◽  
Multiple Correlation Coefficient ◽  
Mean Weight Diameter ◽  
The Mean ◽  
Relationship Of ◽  
Physical And Chemical ◽  
The Relationship

The relationship of the mean weight diameter of water-stable aggregates to certain soil properties (clay, organic matter, free iron, free aluminum, and polysaccharide contents) and the relationship of the increase in aggregation caused by VAMA to the same properties of 24 New Brunswick soils were evaluated by correlation and regression analyses.Simple correlation coefficients relating aggregation to soil properties indicated that organic matter (r = 0.627), polysaccharides (r = 0.602), and aluminum (r = 0.679) were the most important factors. However, when the influence of each factor was separated by partial correlation, the coefficients were not significant. On the other hand, the combined effects of all factors as indicated by the multiple correlation coefficient (r = 0.743) was significant at the 1% level. The effect of the same soil properties on response to VAMA, as shown by increase in mean weight diameter, indicated that clay exerted the greatest influence. The relationship with other factors was nonsignificant.

scholarly journals Soil-Landscape Relationship in the Northern Volcanic Mountain of Leyte, Philippines

2017 ◽  
pp. 87-104
Author(s):  
Roland Rallos ◽  
Victor Asio ◽  
Faustino Villamayor
Keyword(s):  
Sustainable Management ◽  
Crop Production ◽  
Chemical Properties ◽  
Parent Material ◽  
Landscape Position ◽  
Soil Landscape ◽  
Physical And Chemical ◽  
The Relationship ◽  
Unstable Position ◽  
And Chemical Properties

Studies on soil-landscape relationships are necessary to improve our understanding of the spatial distribution and variation of soils for their sustainable management. This study evaluated the relationship between soil properties and landscape position in the northern volcanic mountain of Leyte, Philippines. Five soil profiles located on summit, shoulder, backslope and footslope positions were evaluated. Findings revealed that the degree of soil development as well as the soil morphophysical and chemical properties varied with landscape position. The soil in the most stable position (summit) had thicker solum and slightly more developed soil profile than the soils in other landscape positions. On the other hand, soils in the unstable position (backslope) generally had thinner solum. All the five soils also revealed the influence of the andesitic volcanic parent material on their properties. They all showed some properties typical of Andisols such as low bulk density and high pH in NaF although they were classified as Andic Dystrudept. The soils all possessed physical and chemical constraints for crop production.

scholarly journals Changes of plant cover of the raised peat-bog Baligówka under the influence of human activity

2016 ◽  
Vol 27 (4) ◽  
pp. 7-11
Author(s):  
Magdalena Malec ◽  
Sławomir Klatka ◽  
Marek Ryczek ◽  
Edyta Kruk
Keyword(s):  
Species Composition ◽  
Plant Communities ◽  
Groundwater Level ◽  
Plant Cover ◽  
Chemical Properties ◽  
Peat Bog ◽  
Physical And Chemical Properties ◽  
Peat Formation ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract The main purpose of the work was to determine the scope and degree of the influence of exploitation on changes of plant cover of the raised peat-bog Baligówka, located in the Orawsko- Nowotarska Valley. The analysis was carried out based on 47 phytosociological surveys using the Braun-Blanquet method. Results of investigations allow to state that excessive drying and fires that took place on the examined object caused wastage of many precious species of plants, especially from the Oxycocco- Sphagnetea class. Their place occupied species belonging to other classes, such as Nardo-Callunetea and Molinio-Arrhenatheretea. The basic cause of drying of the peat-bog and, in consequence, dying of peat formation species is intensified exploitation and connected with this drainage, carried out in the half of the 20th century. Unfortunately, local people up to now illegally have harvested the peat on the investigated object. Decrease in groundwater level leads to accelerated decay of peat, changes in physical and chemical properties of a substratum and, in consequence, changes in trophic values of habitat, what causes great changes in species composition of plant communities.

Pronamide Phytotoxicity in Ten Wisconsin Soils

Weed Science ◽  
1980 ◽  
Vol 28 (4) ◽  
pp. 429-432 ◽  
Author(s):  
T. E. Dutt ◽  
R. G. Harvey
Keyword(s):  
Organic Matter ◽  
Chemical Properties ◽  
Clay Content ◽  
Exchange Capacity ◽  
Fresh Weight ◽  
Relationship Of ◽  
Physical And Chemical ◽  
Mg Content ◽  
The Relationship ◽  
And Chemical Properties

Pronamide [3,5-dichloro-(N-1, 1-dimethyl-2-propynyl) benzamide] phytotoxicity was compared in 10 Wisconsin soils and the relationship of activity to soil physical and chemical properties appraised. Twelve soil properties were measured and correlated with pronamide I50(50% fresh weight inhibition) values using oats (Avena sativaL. ‘Portal’) as the indicator plant in bioassays conducted under greenhouse conditions. Organic matter was the soil variable most inversely correlated with pronamide phytotoxicity. Cation exchange capacity, field moisture capacity, and Mg content were also inversely correlated with pronamide phytotoxicity, but probably reflect changes in soil organic matter levels. Clay content did not significantly affect pronamide phytotoxicity.

scholarly journals Moisture, Temperature, and Salinity of a Typical Desert Plant (Haloxylon ammodendron) in an Arid Oasis of Northwest China

2021 ◽  
Vol 13 (4) ◽  
pp. 1908
Author(s):  
Li Zhao ◽  
Wanjing Li ◽  
Guang Yang ◽  
Ke Yan ◽  
Xinlin He ◽  
...  
Keyword(s):  
Soil Water ◽  
Salt Content ◽  
Chemical Properties ◽  
Northwest China ◽  
Water Sources ◽  
Desert Plant ◽  
Haloxylon Ammodendron ◽  
Type Curve ◽  
Ecological Protection ◽  
Physical And Chemical

The physical and chemical characteristics of soil and water sources affect desert plants’ growth, which is essential for the ecological protection in arid areas. The typical patch patterns of Haloxylon ammodendron in the oasis-desert ecotone in the southern margin of the Manas River Basin consists of bare patches (BP) and vegetation patches (VP). The water sources of H. ammodendron were studied using stable isotope technology, and the soil physical and chemical properties were monitored and analyzed. The results showed that the soil moisture presented a reversed “S” type curve, and the total salt content of the soil presented an “S” type curve. A “wet island” and “cold island” were formed in the low salt area with H. ammodendron at the center. NaCl was most abundant in the BP soil, and the milligram equivalent of Cl− was 80–90%, while CaSO4 was most abundant in the VP soil, in which the milligram equivalent of SO42− was 80–100%. Before the rain, H. ammodendron mainly relied on the soil water from a deeper layer (≥60 cm) to maintain its growth. However, after the rain, H. ammodendron mainly relied on shallow soil water (<60 cm) to maintain its growth.

PHOTO-OXIDATION OF CRUDE OILS

1977 ◽  
Vol 1977 (1) ◽  
pp. 617-620 ◽  
Author(s):  
Shinichi Nagata ◽  
Goro Kondo
Keyword(s):  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Photo Oxidation ◽  
Elapsed Time ◽  
Boiling Points ◽  
Ca 50 ◽  
Physical And Chemical ◽  
The Relationship ◽  
Photo Decomposition ◽  
And Chemical Properties

ABSTRACT Changes with elapsed time are presented for five kinds of oils that were studied through the analyses of GLC method, where particularly we made an attempt to examine the relationship among specific gravity, viscosity, and the amount of water in oils. Furthermore, we tried to evaluate a few processes of various kinds of changes on the physical and chemical properties of oils such as evaporation, biodegradation, and photo-decomposition. The evaporation process was found to affect mainly paraffins with smaller boiling points, below the number of C12-C13, for 21 days, while due to the action of marine bacteria, normal paraffins were effectively degraded (ca. 50%) after 15 days except for branched ones. Moreover, it was also found that the aromatic hydrocarbons with anthracene ring and heteroaromatic ones, which were not easily decomposed by the processes mentioned above, were fairly decomposed by photo-irradiation for 10 hours.

scholarly journals NeoCoV Is Closer to MERS-CoV than SARS-CoV

2020 ◽  
Vol 13 ◽  
pp. 117863372093071
Author(s):  
Mohamed M Hassan ◽  
Mohamed A Hussain ◽  
Sumaya Kambal ◽  
Ahmed A Elshikh ◽  
Osama R Gendeel ◽  
...  
Keyword(s):  
Amino Acids ◽  
Maximum Likelihood ◽  
Phylogenetic Trees ◽  
Chemical Properties ◽  
Structural Formula ◽  
Likelihood Method ◽  
Evolutionary Changes ◽  
Whole Genomes ◽  
Physical And Chemical ◽  
The Relationship

Recently, Coronavirus has been given considerable attention from the biomedical community based on the emergence and isolation of a deadly coronavirus infecting human. To understand the behavior of the newly emerging MERS-CoV requires knowledge at different levels (epidemiologic, antigenic, and pathogenic), and this knowledge can be generated from the most related viruses. In this study, we aimed to compare between 3 species of Coronavirus, namely Middle East Respiratory Syndrome (MERS-CoV), Severe Acute Respiratory Syndrome (SARS-CoV), and NeoCoV regarding whole genomes and 6 similar proteins (E, M, N, S, ORF1a, and ORF1ab) using different bioinformatics tools to provide a better understanding of the relationship between the 3 viruses at the nucleotide and amino acids levels. All sequences have been retrieved from National Center for Biotechnology Information (NCBI). Regards to target genomes’ phylogenetic analysis showed that MERS and SARS-CoVs were closer to each other compared with NeoCoV, and the last has the longest relative time. We found that all phylogenetic methods in addition to all parameters (physical and chemical properties of amino acids such as the number of amino acid, molecular weight, atomic composition, theoretical pI, and structural formula) indicated that NeoCoV proteins were the most related to MERS-CoV one. All phylogenetic trees (by both maximum-likelihood and neighbor-joining methods) indicated that NeoCoV proteins have less evolutionary changes except for ORF1a by just maximum-likelihood method. Our results indicated high similarity between viral structural proteins which are responsible for viral infectivity; therefore, we expect that NeoCoV sooner may appear in human-related infection.

Experiment Study on Aviation Kerosene's Flash Point Temperature of Low Pressure Environment

2011 ◽  
Vol 415-417 ◽  
pp. 2160-2165
Author(s):  
Yan Fei Tang ◽  
Lei Yin ◽  
Yi Niu ◽  
Jian Wang
Keyword(s):  
Chemical Properties ◽  
Quadratic Function ◽  
Low Pressure ◽  
Scientific Data ◽  
Flash Point ◽  
Point Temperature ◽  
Oil Pipeline ◽  
Safety Consideration ◽  
Physical And Chemical ◽  
The Relationship

Flash point is one of the major physical and chemical properties used to determine the fire and explosion hazards of liquids; therefore, the prediction of flash point is an important safety consideration. However, the study on flash point and the correlation between flash point and pressure has been inadequate, and needs further investigation. So in this paper, the experimental method is adopted to study the correlation between the closed flash point temperature of RP-5 Aviation Kerosene and low pressure environment. In the experiments, use the BS-1 closed bomb apparatus to measure the oil samples and use the hypobaric chamber to change the environment pressure from 50kPa to 101.3kPa. Through the experiment data, it indicates that the atmospheric pressure is much lower than the normal atmosphere, there is a quadratic function relation between the reciprocal Aviation Kerosene's flash points and logarithm of environment pressure, therefore the relationship between the reciprocal Aviation Kerosene’s flash points and altitude is reciprocal. Compared the experiment results with theoretical results, it finds that the experiment result is closed to reality. The experiment results will provide the scientific data for the safety of aircraft tank, and benefit the fire protection, such as inflammable liquid production, transport, storage et al in oil pipeline management.

Effect of Basicity on Continuous Casting Mold Flux Properties

2012 ◽  
Vol 567 ◽  
pp. 62-65 ◽  
Author(s):  
Xin Hua Zhu ◽  
Li Guang Zhu ◽  
Yu Liu ◽  
Peng Fei Wang
Keyword(s):  
Continuous Casting ◽  
Mold Flux ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Continuous Casting Mold ◽  
Casting Mold ◽  
Flux Function ◽  
Physical And Chemical ◽  
The Relationship ◽  
And Chemical Properties

Basicity is an important parameter which can determine the performance of continuous casting fluxes, and it have different effects on flux of various physical and chemical properties. This paper discusses the relationship and impact between basicity and the physical and chemical properties of flux, Which proved how changes of basicity affect physical and chemical properties of flux, and then how it affects the flux function .

Comparative Analysis of Fungal Diversity and Community Structure of Different Volcanic Soils in Wudalianchi, China

2021 ◽  
Vol 50 (2) ◽  
pp. 327-334
Author(s):  
Fan Yang ◽  
Liqiang Mu ◽  
Qingyang Huang ◽  
Lihong Xie ◽  
Hongjie Cao ◽  
...  
Keyword(s):  
Community Structure ◽  
Environmental Factors ◽  
Fungal Community ◽  
Fungal Diversity ◽  
Chemical Properties ◽  
Fungal Community Structure ◽  
Α Diversity ◽  
Physical And Chemical ◽  
The Relationship ◽  
Soil Environmental Factors

The relationship between the fungal community characteristics and soil environmental factors of volcanic ecosystem in Wudalianchi, China were investigated. The soil fungal community structure and diversity of new, old, and non-erupting volcanos were explored through highthroughput sequencing technology. The result showed that the physical and chemical properties of three plots were significantly different. Through sequencing 578 species, 366 genera, 202 families, 89 orders, 32 classes, and 11 phyla were detected. Among them Ascomycota and Basidiomycota were the dominant fungi phyla. The relative abundance of various flora determined by phylum classification showed significant differences. The Shannon, Simpson, Ace, and Chao1 indices for the soil fungi in the three plots were also significantly different. Redundancy and correlation analyses showed that the α diversity of fungi was significantly correlated with pH, organic matter and total nitrogen in the soil. These results indicate that soil environmental factors influence the fungal diversity in the different volcanic ecosystems in Wudalianchi, China. Bangladesh J. Bot. 50(2): 327-334, 2021 (June)

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