WorldCat Identities

Le Roux, J. J. (Jacobus Johannes) 1888-1946

Overview
Works: 32 works in 137 publications in 5 languages and 392 library holdings
Genres: History  Sources  Romances  Criticism, interpretation, etc 
Roles: Author, Other
Classifications: PF774, 439.317
Publication Timeline
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Most widely held works by J. J Le Roux
Middelnederlandse grammatika by T. H Le Roux( Book )

30 editions published between 1935 and 1977 in 3 languages and held by 105 WorldCat member libraries worldwide

Handleiding in het Afrikaans voor Nederlanders by J. J Le Roux( Book )

10 editions published in 1921 in 3 languages and held by 49 WorldCat member libraries worldwide

Praatjies oor ons Taal by J. J Le Roux( Book )

12 editions published between 1939 and 1949 in Afrikaans and English and held by 36 WorldCat member libraries worldwide

Oor die Afrikaanse sintaksis by J. J Le Roux( Book )

2 editions published in 1923 in Afrikaans and held by 36 WorldCat member libraries worldwide

Oor die Afrikaanse sintaksis by J. J Le Roux( Book )

11 editions published in 1923 in Afrikaans and Dutch and held by 28 WorldCat member libraries worldwide

Anglisismes by J. J Le Roux( Book )

10 editions published between 1952 and 2014 in Afrikaans and English and held by 25 WorldCat member libraries worldwide

Karel ende Elegast by J.-J Leroux( Book )

8 editions published between 1942 and 1980 in 5 languages and held by 20 WorldCat member libraries worldwide

So sê ons in Afrikaans; taaldril vir Engelse leerlinge en studente by J. J Le Roux( Book )

6 editions published between 1947 and 1956 in Afrikaans and held by 14 WorldCat member libraries worldwide

So se ons in Afrikaans : taaldril vir Engelse leerlinge van die hoërskool by J. J Le Roux( Book )

5 editions published between 1947 and 2014 in Afrikaans and Undetermined and held by 14 WorldCat member libraries worldwide

Oor die afrikaanse sintaksis by J. J Le Roux( Book )

4 editions published in 1923 in 3 languages and held by 10 WorldCat member libraries worldwide

Jong Suid-Afrika : sistematiese Afrikaans vir Engelsmedium-skole : st. 3 by C. J Alers( Book )

8 editions published between 1931 and 1943 in Afrikaans and held by 9 WorldCat member libraries worldwide

À l'Assemblée nationale : réflexions sur le choix d'un instituteur de Dauphin by J. J Le Roux( Book )

2 editions published in 1791 in French and held by 8 WorldCat member libraries worldwide

Die nuwe taal- en stylgids vir die hoerskool : volgens die leerplanne van al vier provinsies by J. J Le Roux( Book )

4 editions published between 1943 and 1946 in Afrikaans and Undetermined and held by 7 WorldCat member libraries worldwide

Jan, Jannetje en hun jongste kind by E. J Potgieter( Book )

2 editions published in 1933 in Dutch and English and held by 5 WorldCat member libraries worldwide

Allegorisch verhaal over een Hollands huisgezin, waarmee Potgieter de natie uit haar zelfgenoegzame gezapigheid trachtte wakker te schudden
Oor die afrikanse sintaksis, proefschrift ... door Jacobus Johannes Le Roux, by J. J Le Roux( Book )

1 edition published in 1923 in Dutch and held by 4 WorldCat member libraries worldwide

Table indicative des matières, et table des auteurs pour les LXV. premiers volumes du Journal de médecine ... by J.-J Leroux( Book )

1 edition published in 1788 in French and held by 2 WorldCat member libraries worldwide

Jan, Jannetje en hun jongste kind ... Inleiding en aantekeninge van Prof. Dr. J.J. Le Roux ... Derde druk by E. J Potgieter( Book )

2 editions published in 1933 in French and English and held by 2 WorldCat member libraries worldwide

Soil erosion prediction under changing land use on Mauritius by J. J Le Roux( Book )

3 editions published between 2005 and 2013 in English and held by 2 WorldCat member libraries worldwide

More than one half of the total area of Mauritius Island (1844 km2) is under intensive cultivation, mostly sugarcane. Since the sugarcane industry is currently facing tremendous economic constraints, sugarcane cultivation may be diversified into other agricultural types such as vegetables, pineapple and forestry. Increasing concern about the sugarcane industry and the consequences of agricultural diversification, necessitated the application of soil loss prediction models within a GIS framework. Modelling of the potential soil loss in the Rivierre Des Anguilles catchment (RDAC) is undertaken to understand the extent to which soil erosion is affected by different land use types or agricultural systems. Although most of the RDAC is covered with sugarcane (62%), a wide range of landforms, micro-climates and soils exist, making the catchment representative of southern catchments in Mauritius. The study integrates GIS techniques with two empirical soil loss models: The Revised Universal Soil Loss Equation (RUSLE): and The Soil Loss Estimation Model of Southern Africa (SLEMSA). Both models, as well as the GIS application termed Soil Erosion Assessment using GIS (SEAGIS), are used to investigate average annual soil loss from the catchment under key management practices. Using data on soil erodibility, rain erosivity, topography and land cover, soil loss can be estimated under different management options for cropland (sugarcane, intercropped cane, vegetables, banana and tea) and natural vegetation (scrub and forest). RUSLE is additionally used to predict soil loss for the catchment under potential crop diversification scenarios including, vegetables, pineapple and forest. Using the empirical soil loss models in conjunction with a GIS, it is possible to compile soil erosion prediction maps of the RDAC under current and future conditions. Although soil loss in the catchment varies significantly, models show a similar trend in mean soil loss rates of the cropping systems. Rates are generally highest on steep slopes (>20%) with high rainfall (2400 mm) along the river valley and upper catchment area (above the 400 contour line). Predicted soil loss results, however, indicate a strong inverse relationship with vegetation cover. Very high soil loss values (more than 80 t.ha-1.yr-1) are attained under vegetables, moderate values (13 to 20 t.ha-1.yr-11) under intercropped cane, low (10 t.ha-1.yr-1) or very low (less than 2 t.ha-1.yr-1) under sugarcane, very low (4 t.ha-1.yr-1) to moderate (16 t.ha-1.yr-1) ratings under banana plantations, very low (less than 1 t.-1.yr-1) to high rates (41 t.ha-1.yr-1) under tea plantations, and low rates (less than 10 t.ha-1.yr-1) for natural vegetation. SLEMSA, however, predicts high erosion rates (27 t.ha-1.yr-1to 59 t.ha-1.yr-1) under natural vegetation, since the model is not developed for use in natural conditions. Crop diversification will have a considerable influence on soil erosion. RUSLE predicts a mean soil loss of 42 t.ha-1.yr-1, 20 t.ha-1.yr-1, and 0.2 t.ha-1.yr-1 under vegetables, pineapple, and forest, respectively. When compared to current conditions, the mean soil loss for the catchment will double under pineapple (increase by 100%), and quadruple under vegetables (increase by 300%). Results indicate that no appreciable erosion damage will occur in the RDAC if converted to forested land. Results provide considerable information regarding soil loss under potential land use The study also improves the understanding of factors governing erosion in Mauritius, which is important in the targeting of research and soil conservation efforts. Landowners and the government can use results to promote farming systems that do not degrade land resources
Die nuwe taal- en stylgids vir die hoerskool, volgens die leerplan van al vier provinsies by J. J Le Roux( Book )

2 editions published in 1950 in Afrikaans and held by 2 WorldCat member libraries worldwide

Water erosion risk assessment in South Africa : towards a methodological framework by J. J Le Roux( Book )

2 editions published between 2012 and 2013 in English and held by 2 WorldCat member libraries worldwide

Soil erosion is a major problem confronting land and water resources in many parts of the world and the spatial extent should be assessed and continually monitored. The combination of existing erosion models and remote sensing techniques within a Geographical Information System framework is commonly utilized for erosion risk assessment. In most countries, however, especially in developing countries such as South Africa, there is still an absence of standardized methodological frameworks that deliver comparable results across large areas as a baseline for regional scale monitoring. Assessment at the regional scale is often problematic due to spatial variability of the factors controlling erosion and the lack of input and validation data. Due to limitations of scale at which techniques can be applied and processes assessed, this study implemented a multi-process and multi-scale approach to support establishment of a methodological framework for South African conditions. The approach includes assessment of (i) sheet-rill erosion at a national scale based on the principles and components defined in the (Revised) Universal Soil Loss Equation, (ii) gully erosion in a large catchment located in the Eastern Cape Province by integrating eleven important factors into a GIS, and (iii) sediment migration for a research catchment near Wartburg in KwaZulu-Natal by means of the Soil and Water Assessment Tool. Case Study i illustrates that 20% (26 million ha) of South African land is classified as having a moderate to severe actual erosion risk (emphasizing sheet-rill erosion) and describes the challenges to be overcome in assessment at this scale. Case Study ii identifies severe gully erosion affecting an area of approximately 5 273 ha in the large catchment (Tsitsa valley) of the Eastern Cape Province and highlights gully factors likely to emerge as dominant between continuous gullies and discontinuous gullies. Case Study iii illustrates that a cabbage plot in the upper reaches of a research catchment near Wartburg is a significant sediment source, but is counterbalanced by sinks (river channel and farm dams) downstream. Model assumptions affecting outputs in the context of connectivity between sources and sinks are described. The factor-based nature of this multi-process and -scale approach allowed scrutiny of the role of the main factors in contributing to erosion risk. A combination of poor vegetation cover and susceptible parent material-soil associations are confirmed as the overriding factors in South Africa, and not topography and rainfall as frequently determined in the USA and Europe. A methodological framework with three hierarchical levels is then presented for South Africa. The framework illustrates the most feasible erosion assessment techniques and input datasets for which sufficient spatial information exists, and emphasizes simplicity required for application at a regional scale with proper incorporation of the most important factors. The framework is not interpreted as a single assessment technique but rather as an approach that guides the selection of appropriate techniques and datasets according to the complexity of the erosion processes and scale dependency. It is useful in determining the relative impact of different land use and management scenarios, as well as for comparative purposes under possible future climate change scenarios
 
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Audience level: 0.77 (from 0.68 for Karel ende ... to 0.95 for Oor die af ...)

Alternative Names
Le Roux, J. J. 1888-1946

Le Roux, Jacobus Johannes 1888-1946

Roux, J.J. le

Roux, J. J. le 1888-1946

Roux, J. J. le (Jacobus Johannes), 1888-1946

Languages