THE DEOXY-SUGARS AND OTHER NEUTRAL MONOSACCHARIDES DERIVED FROM RIVERTON, MANITOBA ORGANIC SOIL PROFILES

1980 ◽  
Vol 60 (2) ◽  
pp. 211-217
Author(s):  
H. MORITA ◽  
M. LEVESQUE ◽  
G. F. MILLS
Keyword(s):  
Organic Soil ◽  
Morphological Properties ◽  
Soil Profiles ◽  
Chemical Markers ◽  
Physical Chemical ◽  
Deoxy Sugars

The distribution of eight neutral monosaccharides in the 19 horizons of three organic soil profiles from the Riverton Peatland, Manitoba has been studied. The amounts of the monosaccharides have been found to be related to several characteristic physical, chemical and morphological properties of the horizons. Some horizons afforded appreciable amounts of deoxy-sugars relative to glucose, the predominant monosaccharide. This finding suggested that monosaccharides other than glucose may be useful chemical markers with which to differentiate peats.

Recycling of Concentration Tailings of Iron Ore for the Production of Concrete Block (Pavers)

2014 ◽  
Vol 775-776 ◽  
pp. 631-634 ◽  
Author(s):  
Fabiane Leocádia da Silva ◽  
Fernando Gabriel S. Araújo ◽  
Camila G. Castro ◽  
Jefferson J. Mendes ◽  
Fernando L. von Krüger
Keyword(s):  
Mechanical Properties ◽  
Iron Ore ◽  
Concrete Block ◽  
Morphological Properties ◽  
Iron Ore Tailings ◽  
Physical Chemical

This paper studies the technological feasibility of using iron ore tailings as additives in cement pavers for the optimization of the mechanical properties and color modulation.Thus, to study the physical, chemical, optical and morphological properties of the tailings, they were characterized for the composition, mineralogy and granulometry. To optimize the procedure of preparing iron ore tailings as additives in the production of new concrete pavers and to determine their effects on the properties of pavers they, were added in ratios of 0% to 50% in substitution of traditional aggregates. The pavers were characterized for hermeticity and mechanical properties.

MONOLITH COLUMNS FOR STUDYING ORGANIC SOIL PROFILES

1986 ◽  
Vol 66 (4) ◽  
pp. 737-742
Author(s):  
J. A. MILLETTE ◽  
R. S. BROUGHTON
Keyword(s):  
Hydraulic Conductivity ◽  
Physical Properties ◽  
Bulk Density ◽  
Organic Soil ◽  
Saturated Hydraulic Conductivity ◽  
Fiber Content ◽  
Organic Soils ◽  
Soil Profiles ◽  
Sampling Procedures ◽  
Monolith Columns

Monolith column construction and sampling procedures were described for organic soil profiles and used to measure the variation with depth of saturated hydraulic conductivity, bulk density and fiber content. The top 0.30 m of the organic soil was more permeable, had a greater bulk density and had a greater fiber content than the soil layer between 0.60 and 0.90 m from the soil surface. These columns can be used for correlations studies between physical properties and studies of the dynamic nature of the physical properties of organic soils. Key words: Saturated hydraulic conductivity, bulk density, fiber content, organic soil, monolith columns

scholarly journals Pedon Characterization in the Caatinga Biome Area in Chapada Apodi, RN, Brazil

2020 ◽  
Vol 12 (9) ◽  
pp. 138 ◽  
Author(s):  
Francisca Elisângela Maniçoba ◽  
Francisco Gonçalo Filho ◽  
Lunara G. da S. Rêgo ◽  
Carolina M. M. Souza ◽  
Ana Carla Rodrigues da Silva ◽  
...  
Keyword(s):  
Classification System ◽  
Rio Grande ◽  
Soil Classification ◽  
Soil Profiles ◽  
Agricultural Activity ◽  
Physical Chemical ◽  
Caatinga Biome

The Apodi Plateau is a Brazilian with important agricultural activity, which is located between the states of Ceará and Rio Grande do Norte, in an area of the Caatinga biome. Therefore, this work was developed to characterize the morphological, physical, chemical and mineralogical attributes of soil profiles of this region. For this purpose, trenches were open in three areas in the Tabuleiro Grande Settlement Project, in the municipality of Apodi, RN, Brazil. The profiles were described in the field and samples of the horizons were collected for physical, chemical and mineralogical analyzes. The profiles were classified up to the fourth categorical level and correlated with Soil Taxonomy.According to the Brazilian Soil Classification System, the soils studied were Vertissolo Háplico Órtico chernossólico (Mollisols), Chernossolo Rêndzico Petrocálcico típico (Mollisols) e Vertissolo Háplico Órtico chernossólico (Vertisols).

Fire-patterned vegetation and the development of organic soils in the lowland vegetation mosaics of south-west Tasmania

2011 ◽  
Vol 59 (2) ◽  
pp. 126 ◽  
Author(s):  
S. W. Wood ◽  
Q. Hua ◽  
D. M. J. S. Bowman
Keyword(s):  
Soil Depth ◽  
Isotope Composition ◽  
Organic Soil ◽  
Fire Frequency ◽  
Organic Soils ◽  
Soil Profiles ◽  
Radiocarbon Age ◽  
South West ◽  
Vegetation Boundary ◽  
Vegetation Mosaics

Two contrasting ecological models have been proposed for the forest–moorland vegetation mosaics of south-west Tasmania that stress different interactions between fire, soils, vegetation and the physical environment to produce either stable or dynamic vegetation patterns. We investigated aspects of these models by sampling organic soil profiles across vegetation mosaics to determine variation in soil depth, organic carbon (C) content, nutrient capital, stable C isotope composition (δ13C) and 14C radiocarbon age in two contrasting landscape settings. 14C basal ages of organic soils ranged from recent (<400 calibrated (cal.) years BP) to mid Holocene (~7200 cal. years BP), with a tendency for older soils to be from poorly drained moorlands and younger soils from the forest. The long-term net rate of C accumulation ranged from 2.7 to 19.2 gC m–2 year–1, which is low compared with northern hemisphere peatland systems. We found that δ13C in organic soil profiles cannot be used to infer Holocene vegetation boundary dynamics in these systems. We found a systematic decrease of phosphorus from rainforest through eucalypt to moorland, but estimated that phosphorus capital in moorland soils was still sufficient for the development of forest vegetation. Our results suggest that the characteristics of organic soils across the landscape are the result of interactions between not only vegetation and fire frequency, but also other factors such as drainage and topography.

Changes in pore structure in a no-till chronosequence of silt loam soils, southern Ontario

1999 ◽  
Vol 79 (1) ◽  
pp. 149-160 ◽  
Author(s):  
A. J. VandenBygaart ◽  
R. Protz ◽  
A. D. Tomlin
Keyword(s):  
Soil Profile ◽  
Soil Structure ◽  
Management Practices ◽  
Crop Yields ◽  
Morphological Properties ◽  
Root Penetration ◽  
Short Term ◽  
Physical Chemical ◽  
No Till ◽  
Pore Properties

Many research studies have dealt with the influences of minimum or no-till soil management practices on the major physical, chemical, biological and morphological properties in the soil profile. However little work has been done on the assessment of the rates of changes in pore properties as management practices are converted from conventional to no-till (NT) methods. Short-term changes in soil micromorphology attributed to conversion to no-till from conventionally tilled management are evaluated in this paper. As the number of years in no-till increased there was a decrease in the number pores of 30- to 100-µm diameter in the no-till soils. However, pores from 100- to 500-µm diameter increased in number only after 4 yr of NT. The pores of this size are important for water storage, transmission and root development. The decline in the number of these pores after no-till initiation followed by the increase after 4 yr may explain why crop yields tend to be lower only after the first few years after implementing no-till. The 100- to 500-µm diameter pores may be crucial for the proper development of roots in wheat and corn. The no-till soils had greater numbers of horizontally oriented elongated macropores in the top 5 to 15 cm of the soil profile due to the lack of tillage and annual freeze-thaw processes. These pores may inhibit proper drainage and root penetration. Rounded macropores increased with the number of years the soil was in no-till as these pores were maintained each year due to the lack of tillage and greater faunal activity in the no-till soils. Key words: Micromorphology, image analysis, earthworms, no-till, soil structure

THE ESTABLISHMENT OF SYNCHRONY BETWEEN SUBSURFACE LAYERS AND ESTIMATION OF OVERALL SUBSIDENCE OF CULTIVATED ORGANIC SOILS BY A PALYNOLOGICAL METHOD

1982 ◽  
Vol 62 (2) ◽  
pp. 427-431 ◽  
Author(s):  
S. P. MATHUR ◽  
M. P. LÉVESQUE ◽  
P. J. H. RICHARD
Keyword(s):  
Bimodal Distribution ◽  
Organic Soil ◽  
Tsuga Canadensis ◽  
Organic Soils ◽  
Soil Profiles ◽  
Subsurface Layers ◽  
Physical Changes ◽  
Cultivated Soils

Pollen profiles of Tsuga canadensis in a virgin and two cultivated areas of a bog revealed the bimodal distribution characterized by easily recognizable minima, thus establishing synchrony between specific layers of the three organic soil profiles. This knowledge allowed estimation of overall subsidence of the cultivated soils, and would facilitate comparisons between subsurface layers now determinable as synchronous. Such comparisons should help determine the extent and depth of temporal biochemical and physical changes in subsurface layers of cultivated organic soils.

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