COMPARISON OF CANADIAN AND AMERICAN CLASSIFICATION SYSTEMS FOR SOME ARCTIC SOILS OF THE UNGAVA-LABRADOR PENINSULA

1985 ◽  
Vol 65 (2) ◽  
pp. 283-291 ◽  
Author(s):  
W. H. HENDERSHOT
Keyword(s):  
Soil Temperature ◽  
Key Words ◽  
Soil Classification ◽  
Fine Sand ◽  
Classification Systems ◽  
Shallow Depth ◽  
American System ◽  
Arctic Soils ◽  
Temperature Regimes ◽  
Definition Of

Thirteen pedons in an arctic environment were classified according to the Canadian and American systems of soil classification. Major differences in groupings result from the contrasting approaches. Although the definition used in Canada to define Cryosols is sometimes difficult to apply in the field, the underlying concept is valid, since soils with permafrost at a shallow depth should be separated at the highest level of classification. The American system virtually ignores the influence of permafrost on pedogenesis. Its reliance on soil temperature regimes at both the great group and subgroup levels is redundant. It is suggested that the definition of Cryosols, in the Canadian system, be changed to include strongly cryoturbated soils with very cold or colder soil temperature regimes. The American system should be altered to provide for pergelic great groups; in addition permafrost and strong cryoturbation should be used to create new subgroups. The requirement that a cambic horizon have a texture finer than loamy fine sand should be waived in soils having cryic or pergelic soil temperature regimes. Key words: Cryosols, cryoturbated soils, permafrost, pergelic soils

Controversies in the Definition of “Iso” Soil Temperature Regimes

2009 ◽  
Vol 73 (3) ◽  
pp. 983-988 ◽  
Author(s):  
M. Tejedor ◽  
C. Jiménez ◽  
M. Rodríguez ◽  
J. Neris
Keyword(s):  
Soil Temperature ◽  
Temperature Regimes ◽  
Definition Of

scholarly journals Soil temperature regimes in Finland

1998 ◽  
Vol 7 (4) ◽  
pp. 507-512 ◽  
Author(s):  
M. YLI-HALLA ◽  
D. MOKMA
Keyword(s):  
Soil Temperature ◽  
Temperature Regime ◽  
Soil Surface ◽  
Soil Classification ◽  
Soil Taxonomy ◽  
The North ◽  
Temperature Regimes ◽  
Soil Temperature Regime ◽  
The Mean ◽  
The Difference

Soil temperature regime substantially influences soil classification in Soil Taxonomy particularly in temperate areas. To facilitate correct classification of soils of Finland, the temperature regimes in soils of the country were determined. The mean annual soil temperature, measured at 50 cm below soil surface, ranged from 6.4°C at the warmest site (Anjala) to 1.9°C at the coldest one (Utsjoki, Kevo), and the mean summer soil temperature from 13.7°C to 6.2°C at the same stations, all being in the range of the cryic temperature regime. The mean annual soil temperature was 2 to 5°C higher than the mean annual air temperature, the difference (Y, °C) depending on the duration of snow coverage (X, days) according to the following equation: Y = 0.0305 X - 2.16, R2 = 0.91, n = 9. Even soils of the warmest areas in southern Finland and the mineral soils of the coldest areas in the north, at least for the most part, have cryic soil temperature regimes. Therefore, most soils of Finland, classified according to Soil Taxonomy, have names where the cryic temperature regime appears on the suborder or great group level.;

INTERPRETATION SHEETS FOR ENGINEERING CLASSIFICATIONS IN SOIL SURVEYS

1983 ◽  
Vol 63 (4) ◽  
pp. 679-689 ◽  
Author(s):  
G. WILSON
Keyword(s):  
Key Words ◽  
Soil Classification ◽  
Classification Systems ◽  
Soil Survey ◽  
Time Element ◽  
Effective Use ◽  
Soil Surveys ◽  
Engineering Soil ◽  
Engineering Classification ◽  
Mapping Units

The UNIFIED and AASHTO systems are used in engineering to classify soils for specific purposes. To facilitate use of the soil surveys by engineers, it has been customary to interpret soil survey mapping units in terms of these engineering classification systems. The procedure, however, is often difficult to follow and normally time-consuming. When used in combination with pedotechnical setting sheets, interpretation sheets reduce this time element and provide for more effective use of the soil survey information. This paper demonstrates development and application of the interpretation sheets. Key words: Engineering soil classification, pedotechnical interpretations, UNIFIED, AASHTO, soil engineering

scholarly journals Chernozem (czarnoziem) – soil of the year 2019 in Poland. Origin, classification and use of chernozems in Poland

2019 ◽  
Vol 70 (3) ◽  
pp. 184-192
Author(s):  
Cezary Kabała
Keyword(s):  
Human Impacts ◽  
Soil Classification ◽  
Classification Systems ◽  
Soil Taxonomy ◽  
Soil Science Society ◽  
Neolithic Agriculture ◽  
Introductory Paper ◽  
Definition Of ◽  
Agriculture Development ◽  
Specific Definition

Abstract The Soil Science Society of Poland has elected chernozem to be the Soil of the Year 2019. Although chernozems cover less than 2% of Poland, they have high importance for agriculture due to their productivity and play a specific scientific role for understanding of soil development and functioning in an environment. Chernozems are also crucial for the reconstruction of Neolithic agriculture development and human impacts on soil and landscape. This introductory paper presents (a) a specific definition of chernozem in Poland, connected with a separate distinction of black earths and colluvial chernozemic soils; (b) a review of the present and former classification schemes for chernozems in Poland and their correlation with international soil classification systems (WRB and Soil Taxonomy); (c) the spatial distribution of chernozems in Poland, their agricultural evaluation and threats for chernozems’ quality and future existence related to intense land use.

scholarly journals A Comparison of some Upland and Valley Soils in the Ungava-Labrador Peninsula

2007 ◽  
Vol 38 (3) ◽  
pp. 243-256 ◽  
Author(s):  
William H. Hendershot
Keyword(s):  
Soil Temperature ◽  
Black Spruce ◽  
Carbon Accumulation ◽  
Shallow Depth ◽  
Soil Profiles ◽  
Tree Line ◽  
Climatic Regions ◽  
Coarse Texture ◽  
Active Mixing ◽  
Extractable Iron

ABSTRACT Thirteen soil profiles from northern Québec and Labrador, Canada, near the northern tree-line, were sampled and analysed. Five of these, located on poorly to imperfectly drained sites, are strongly cryoturbated soils with permafrost at a shallow depth. Below the surface horizon they have very uniform profile distributions of pH, carbon and extractable iron and aluminum due to the active mixing of the horizons. The eight soils from well-drained sites have profiles similar to those of soils in similar settings in more temperate climatic regions. One of these, developed in one of the most northerly valleys having a black spruce-larch forest vegetation, has the characteristics of a podzol (spodosol) except that the podzolic B (spodic) horizon is too thin. The other seven profiles all have color B horizons, although the coarse texture prevents their classification as cambic horizons; these soils all have carbon-rich A horizons varying in thickness from 1.5 to 20 cm. Soil temperature at 50 cm depth closely follows the elevational and latitudinal distribution of the soils; a range of 0 to 10° C was observed. Soil development, measured as depth of solum, organic carbon accumulation or degree of B horizon development, is closely related to soil temperature and site position. The presence of permanently frozen ice layers at shallow depth has a marked influence on soil genesis and the properties of the resultant soils.

ПИТАННЯ МОВЛЕННЄВОЇ КОМПЕТЕНТНОСТІ В НАУКОВІЙ ЛІТЕРАТУРІ

2012 ◽  
Vol 33 ◽  
Author(s):  
В. О. Лапіна
Keyword(s):  
Key Words ◽  
Scientific Literature ◽  
Language Competence ◽  
Points Of View ◽  
Definition Of

У статті здійснено аналіз різних позицій на визначення поняття «мовленнєва компетентність» у науковій літературі з лінгводидактики та психології.Ключові слова: мовленнєва компетентність/компетенція, мовна компетентність/компетенція.  Analysis of different points of view on the definition of `speech competence` in scientific literature on Linguodidactics and Psychology. Key words: speech competence/competency, language competence/competency.

Chinese Intellectuals as Represented in ‘New Era’ Fictional Dialogues

2017 ◽  
Author(s):  
Hui Lai
Keyword(s):  
Key Words ◽  
Stylistic Analysis ◽  
Dual Model ◽  
New Era ◽  
Qualitative Approaches ◽  
Diachronic Change ◽  
The Status ◽  
Diachronic Study ◽  
Chinese Intellectuals ◽  
Definition Of

This book explores the status of Chinese intellectuals from 1980 to 2005 and its diachronic change in this period, as represented by dialogues between intellectuals and their leaders in fiction. June 1989 serves as a historical dividing line on which to base this diachronic study. In order to carry out the study, first, the direct speech of intellectuals and their leaders is extracted and compiled into corpora for a ‘key key-words’ analysis (see section 3.3.2 for a definition of key key-words). Second, a stylistic analysis is undertaken with the aim of conducting a more detailed qualitative investigation of the dialogues. Three dialogues in each of the two periods are selected for the stylistic analysis. The key-words derived from this analysis describe features of the speech of intellectuals, the speech of intellectuals as compared to the speech of leaders and the speech of leaders as compared to that of intellectuals. The study shows that the key key-words indicating topics of the speech and those characterising the style of the speech represent the social identity of intellectuals. A comparison of these key keywords between the two periods uncovers the diachronic change in the status of intellectuals. The corpus approach is complemented by a stylistic analysis, which explores dialogues selected from different years to emphasise the diachronic change. A dual model is formulated to incorporate dialogue analysis into a larger structure of goal development analysis. The study shows how speakers use discursive strategies to manage relationships and have their situational goals achieved in interaction. Negotiation of goals invokes the institutional and social identities of speakers, bringing out their status. The research shows that the corpus approach and the stylistic analysis can be combined to present a more comprehensive description of data. It is hoped that this will shed some light on studies of post-Cultural Revolution Chinese intellectuals and on how quantitative and qualitative approaches merge in the investigation of interaction between superiors and subordinates.

Computerized Cone Penetration Test for Soil Classification

2008 ◽  
Vol 2053 (1) ◽  
pp. 47-64 ◽  
Author(s):  
Murad Y. Abu-Farsakh ◽  
Zhongjie Zhang ◽  
Mehmet Tumay ◽  
Mark Morvant
Keyword(s):  
Classification System ◽  
Soil Classification ◽  
Cone Penetration Test ◽  
Classification Systems ◽  
Fuzzy Classification ◽  
Classification Methods ◽  
Penetration Test ◽  
Cone Penetration ◽  
Cone Tip Resistance ◽  
Tip Resistance

Computerized MS-Windows Visual Basic software of a cone penetration test (CPT) for soil classification was developed as part of an extensive effort to facilitate the implementation of CPT technology in many geotechnical engineering applications. Five CPT soil engineering classification systems were implemented as a handy, user-friendly, software tool for geotechnical engineers. In the probabilistic region estimation and fuzzy classification methods, a conformal transformation is first applied to determine the profile of soil classification index (U) with depth from cone tip resistance (qc) and friction ratio (Rf). A statistical correlation was established in the probabilistic region estimation method between the U index and the compositional soil type given by the Unified Soil Classification System. Conversely, the CPT fuzzy classification emphasizes the certainty of soil behavior. The Schmertmann and Douglas and Olsen methods provide soil classification charts based on cone tip resistance and friction ratio. However, Robertson et al. proposed a three-dimensional classification system that is presented in two charts: one chart uses corrected tip resistance (qt) and friction ratio (Rf); the other chart uses qt and pore pressure parameter (Bq) as input data. Five sites in Louisiana were selected for this study. For each site, CPT tests and the corresponding soil boring results were correlated. The soil classification results obtained using the five different CPT soil classification methods were compared.

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