Numerical classification of soil profiles on the basis of field morphological properties

Soil Research ◽  
1970 ◽  
Vol 8 (1) ◽  
pp. 43 ◽  
Author(s):  
NA Campbell ◽  
MJ Mulcahy ◽  
WM Mcarthur
Keyword(s):  
Numerical Taxonomy ◽  
Morphological Properties ◽  
Soil Profiles ◽  
Numerical Classification ◽  
Classification Schemes ◽  
Texture Profile ◽  
Original Field ◽  
Soil Groups ◽  
Subsequent Identification

The use of numerical taxonomy to classify soils avoids classification schemes based on logical subdivision or keys by the application of objective numerical procedures to assess the similarity, and the subsequent identification, of soil groups. It was found that a combination of a hierarchical sorting strategy and a coordinate strategy avoided distortion of relationships and subjectivity in group recognition. The results of the numerical classification agreed closely with the original field grouping. Examination of the resulting soil groups indicated that texture profile was an important diagnostic property.

SOIL ANALYSIS AND NUMERICAL CLASSIFICATION OF THE LANORAIE DELTA, QUEBEC

1987 ◽  
Vol 67 (3) ◽  
pp. 417-432 ◽  
Author(s):  
L. LAMONTAGNE ◽  
C. CAMIRE
Keyword(s):  
Ecological Study ◽  
Soil Analysis ◽  
Soil Classification ◽  
Numerical Classification ◽  
Soil Water Regime ◽  
Forest Sites ◽  
Soil Distribution ◽  
Genetic Development ◽  
Soil Groups

Analysis and numerical classification of Lanoraie Delta soils were performed as part of an ecological study. After stratification, using detailed soil maps, 84 forest sites were randomly sampled. Eighteen soil descriptors, mainly morphologic, were retained for numerical analysis. Gower's similarity coefficient between profiles was used for the principal coordinate analysis (PCA) which brought out the most probable factors governing soil distribution. The first two axes of the PCA represented 15.5 and 6.2% of the total variance. Soil distribution was along two gradients: soil water regime (Xeric-Hydric) and genetic development (Gleysolic-Podzolic). Cluster analysis by complete linkage created five soil groups which were composed of 23, 9, 17, 25 and 10 soil individuals, respectively. The interpretation of these soil groups utilized the superposition of clusters onto the first two axes of the PCA. Each group was classified into a taxonomic subgroup (Canadian System of Soil Classification) and defined by a typical humus form. Key words: Lanoraie Delta, multivariate analysis, soil classification

Numerical Taxonomy in Marketing Analysis: A Review Article

1968 ◽  
Vol 5 (1) ◽  
pp. 83-94 ◽  
Author(s):  
Ronald E. Frank ◽  
Paul E. Green
Keyword(s):  
Numerical Taxonomy ◽  
Review Article ◽  
Numerical Classification ◽  
Classification Problems ◽  
Recent Developments ◽  
Marketing Analysis

Recent developments in numerical taxonomy appear to show applicability for many classification problems in marketing. This review article describes some of the approaches to numerical classification and presents illustrative marketing applications. Current limitations of the procedures are also discussed.

CLASSIFICATION SYSTEMS FOR ADOLESCENT AND ADULT SCOLIOSIS

Neurosurgery ◽  
2008 ◽  
Vol 63 (suppl_3) ◽  
pp. A16-A24 ◽  
Author(s):  
Justin S. Smith ◽  
Christopher I. Shaffrey ◽  
Charles Kuntz ◽  
Praveen V. Mummaneni
Keyword(s):  
Health Care Providers ◽  
Research Society ◽  
Classification Systems ◽  
Adult Scoliosis ◽  
Care Providers ◽  
Classification Schemes ◽  
Scoliosis Research Society ◽  
Adult Degenerative Scoliosis ◽  
Spinal Abnormality

ABSTRACT OBJECTIVE To review current classification systems for adolescent and adult scoliosis. METHODS The literature was reviewed in reference to scoliosis classification systems for adolescent and adult scoliosis. RESULTS There are multiple classification systems for scoliosis. Classification of scoliosis is dependent on patient age, spinal abnormality, scoliotic curve, and global spinal alignment. To date, classification systems have focused predominantly on adolescent idiopathic scoliosis or adult/degenerative scoliosis; a single classification system evaluating scoliotic deformities of different ages and spinal abnormalities has not been identified. CONCLUSION The importance of scoliosis classification schemes lies in their ability to standardize communication among health care providers. With regard to the classification of adolescent scoliosis, the Lenke system has addressed many of the significant limitations of the King system and is now the standard classification scheme. Classification schemes for adult scoliosis have been reported only recently, and each offers specific advantages (the simple pathogenesis-based system of Aebi, the strong clinical relevance of the Schwab system, and the richly descriptive Scoliosis Research Society system). This article highlights the salient features of currently used scoliosis classification systems.

scholarly journals Definiteness Systems and Dialect Classification

Languages ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 128
Author(s):  
Mike Turner
Keyword(s):  
Binary System ◽  
Recent Work ◽  
Classification Schemes ◽  
Modeling Process ◽  
Arabic Dialects ◽  
Dialect Classification ◽  
Semantic Typology

In this article I explore how typological approaches can be used to construct novel classification schemes for Arabic dialects, taking the example of definiteness as a case study. Definiteness in Arabic has traditionally been envisioned as an essentially binary system, wherein definite substantives are marked with a reflex of the article al- and indefinite ones are not. Recent work has complicated this model, framing definiteness instead as a continuum along which speakers can locate referents using a broader range of morphological and syntactic strategies, including not only the article al-, but also reflexes of the demonstrative series and a diverse set of ‘indefinite-specific’ articles found throughout the spoken dialects. I argue that it is possible to describe these strategies with even more precision by modeling them within cross-linguistic frameworks for semantic typology, among them a model known as the ‘Reference Hierarchy,’ which I adopt here. This modeling process allows for classification of dialects not by the presence of shared forms, but rather by parallel typological configurations, even if the forms within them are disparate.

Numerical classification of French vegetation of Carici caryophylleae – Genistetea lobelii J.-C. Klein 1972

2021 ◽  
Vol 42 ◽  
pp. e68062
Author(s):  
Pauline Delbosc ◽  
Mathieu Le Dez ◽  
Jean-Bernard Bouzillé ◽  
Kevin Cianfaglione ◽  
Frédéric Bioret
Keyword(s):  
Expert System ◽  
Dominant Species ◽  
Numerical Classification ◽  
Distribution Map ◽  
Diagnostic Species ◽  
Plant Associations ◽  
Formal Definitions ◽  
Twinspan Classification ◽  
New Association

Carici-Genistetea lobelii Klein 1972 corresponds to cyrno-sardinian oromediterranean cushion scrub and related grasslands. In France, this class is only present in Corsica and the syntaxonomic scheme is debated among phytosociologists. The aim of this paper is to highlight the main plant associations of Carici-Genistetea lobelii Klein 1972 and to define the diagnostic species for each phytosociological unit. We compiled 519 vegetation plots and we applied EuropeanVegetationChecklist expert system for the classes of European vegetation to retain only vegetation plots belonging to Carici-Genistetea lobelii. We obtained a dataset with 189 vegetation plots and we classified them with Modified TWINSPAN classification. Our analyses recognized 6 plant associations and 3 sub-associations already described in the literature; and to describe a new alliance corresponding to the supra-mediterranean vegetations (Genistion salzmannii), a new association (Brimeuro fastigiatae-Juniperetum nanae) and its sub-association (alnetosum suaveolentis). For each of them, we identified diagnostic, constant and dominant species and produced their distribution map. Formal definitions were then written for each phytosociological unit (from subassociation to class) and grouped in an expert system to automatically classify the vegetations of Carici-Genistetea lobelii.

Numerical Classification of Thermus Isolates from Globally Distributed Hot Springs

1989 ◽  
Vol 11 (3) ◽  
pp. 250-256 ◽  
Author(s):  
J. Andrew Hudson ◽  
Hugh W. Morgan ◽  
Roy M. Daniel
Keyword(s):  
Hot Springs ◽  
Numerical Classification ◽  
Globally Distributed

An evaluation of the taxonomy of Propionibacterium

1968 ◽  
Vol 14 (11) ◽  
pp. 1185-1191 ◽  
Author(s):  
A. C. Malik ◽  
G. W. Reinbold ◽  
E. R. Vedamuthu
Keyword(s):  
Host Range ◽  
Numerical Taxonomy ◽  
Similar Group ◽  
Propionibacterium Shermanii

The object of this study was to reevaluate speciation of Propionibacterium by using numerical taxonomy. Fifty-six cultures representing eight species were studied. Thirty-eight morphological and physiological features were employed in the calculation of matching coefficients which were used to sort the cultures into groups. The results suggest a need for species consolidation; for example, Propionibacterium shermanii could appropriately become P. freudenreichii var. shermanii. Close resemblances were found between P. rubrum, P. peterssonii, and P. jensenii. Propionibacterium arabinosum and P. pentosaceum formed another mutually similar group. Further studies using additional cultural, physiological, serological, genetic, and phage host-range characteristics should be instituted to establish an improved classification of propionibacteria.

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