Andosols of the Canary Islands (X). Vitrandepts. Mineralogical characteristics. Their interpretation and classification

12 páginas, 8 gráficas.Interpretation, classification and mineralogical characteristics of Vitrandepts are given by the authors. The soils of this group are typically andosoils, with a littie differenciated profil developed on very recent vitric pyroclastic materials. Primary minerals, and volcanic glasses are very abundant in the gross and fine fractions of this soil. Secondary minerals are mainly allophane. Techniques used for mineralogical identifications include X-Ray, Infrared and electron-Microscope.Peer reviewe

Anales de Edafología y Agrobiología Tomo 34 Número 3-4

Estudio de la materia orgánica del ranker atlántico. I. Caracterización general, por P. Rodríguez Seoane, T. Carballas y F. Guitián Ojea.-- Movimiento y distribución de sales solubles en suelos calizos, por F. G. Fernández, M. Caro y A. Cerda.-- The availability of added and native phosphorus to barley grown in sorne Egyptian soils .containing different levels of calciurn carbonate, by M. H. Nafady.-- The measurernent of soil pH in calciurn chloride solutions, by M. H. Nafady.- Nuevas aportaciones al conocimiento del género Mnema (nernatoda) y su distribución en los suelos españoles, por María Arias.-- Estudios bioquímicos y fisiológicos en aceituna. III. Variaciones en el crecimiento de hojas y frutos, por J. P. Donaire, A. J. Sánchez-Raya, J. López Corge y L. Recalde.-- Importancia de la rnicorrización espontánea en ensayos de nutrición vegetal en suelos deficientes en fósforo, por R. Azcón y J. M. Barea.-- Andosoles canarios. J. Características generales de estos suelos, por E. Fernández Caldas y M. L. Tejedor Salguero.-- Andosoles canarios. II. Intergrados andosol-tierra parda oligotrófica. Características morfológicas y quírnkas, por M. L. Tejedor Salguero y E. Fernández Caldas.-- Andosoles canarios. lll. Jntergrados andosol-tierra parda otigotrófica. Catacterísticas físicas, por E. Fernández Caldas y M. L. Tejedor Salguero.-- Andosoles canario;. IV. In ter grados andosol-tierra parda ohgotrófica. Características mineralógicas. Interpretación y clasificación, por C. Rodríguez Pascual, P. Quantin, M. L. Tejedor Salguero y E. Fernández Caldas.-- Estudios recapitualtivos.-- La vid una revisión de las condiciones del cultivo, por C. González O. y M. Lachica.—Notas científicas.-- Nota sobre la determinación del carbono orgánico en suelos, por J. F. Gallardo.—Notas.-- Ampliación de la Comisión Permanente de la Junta de Gobierno del Patronato Alonso de Herrera.-- Nombramiento de Secretario del Centro de Edafología y Biología Aplicada de Tenerife.-- Nombramientos en el Instituto de Alimentación v Productividad Animal.-- Cambio de representantes del Patronato Alonso de Herrera en la Comisión Asesora de la Investigación Científica y Técnica.-- Convenio con ASPA.-- Dimisión del Director del Centro de Edafología y Biología Aplicada del Segura de Murcia.-- Nombramientos de representantes en los C. R. l. D. A. S.-- Designación de Jurados para Premios del C. S. l. C.-- Informes del Secretario Adjunto del C. S. I. C. sobre reuniones en Europa.-- Convenio entre la Estación Experimental del Zaidín y la Universidad de Nápoles.-- Donación de terrenos a la Diputación de Badajoz.-- Seminario Oleícola Internacional.-- Congreso de la Unión Fitopatológica Mediterránea.-- Situaciones de personal.-- Reunión de la Comisión de Protección Vegetal.-- Día Forestal Mundial.-- Congresos y reuniones internacionales y viajes.-- Premio Agrícola Aedos.-- BibliografíaPeer reviewed2019-08.- CopyBook.- Libnova.- Biblioteca ICA

A climatic sequence of ancient soils in northern Tenerife Canary Islands. Part. 1: Morphological and Physiochemical features

The study of a toposequence on the northern side of Tenerife has revealed a close relationship between the distribution of the oldest soils and the different ecological zones (of climate and vegetation). This sequence is made up successively from top to bottom of : ferralitic soils in a perhumid zone, fersiallitic soils in a sub-tropical climatic zone with two very contrasting seasons, and vertisols in the lower zone of the slope with a semi-desertic climate. In the first part of the study the morphological, physical and chemical properties of the soils are presented. The ferrallitic soils are complex, often being rejuvenated by volcanic ashes which have formed either a superficial disatured andosol, or a brown andic soil, or both successively ; certain characteristics allow them to be included with the ferrallitic soils or even with the Oxisols. The fersiallitic soils are red, moderately disatured, slightly leached and show a smail degree of rejuvenation of superficial extent ; yhey are similar to tropical fersiallitic soils and sometimes to the Alfisols. The dark coloured vertisols are typical ; they have an accumulation of calcium carbonate and a beginning of alkalinization in depth. The evolution of the different characteristics in the sequence is very marked. The second part of the study deals with the mineralogical and micromorphological characteristics. Here, the passage from ferrallitic soils with hallosyte and iron and aluminium oxy-hydroxides, for instance gibbsite, to a mixture of hallosyte and 2:I clays (montmorillonite, I-V, illite), and hematite in the fersiallitic soils, to finish exclusively with ferrferous montmorillonite in the vertisols is shown. In the same direction, the content of aluminium, iron and readily soluble silica decreases rapidly. The micromorphology shows the following evolution : from a microporous weathering structure with gibbsitans in the ferrallitic soils, it passes to a clavery illuviation structure in some fersiallitic soils, and finally to a structure of stress-cutans with multiple orientations in the vertisols, and even a structure of saline accumulation with calcitanes. Posteriorly, a summary of the typological and pedogenetic characteristics for each type of soils is made, which leads on to their respective classification (French and American systems). Finally after having summarized the evolution of the characteristics of the soils in the sequence, the problem of the relationship betwee the pedogenesis of the aged soils and the actual climatic zonality, is briefly discussed. An hypothesis concerning the recent evolution of the climate is proposed.Peer reviewe

Séquence climatique des sols anciens de la région septetrionale de Ténérife (Iles Canaries). 3e partie: typologie, pédogenèse et classification (I)

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Andosols of the Canary Islands. (III) Intergrades andosol-oligotrophic brown earth. Physical characteristics

11 páginas, 5 gráficas, 2 tablas.The authors, studied the physical characteristics of the intergrades andosol-oligotrophic brown earth, present in the Canary Islands (Tenerife, Gomera, Hierro). In this study, macro and microporosity, pF, densities and granulometric characteristcs, are determined in the diferents horizons of the profiles. Differences on the physical characteristics among these groups are evident and agree in general with the parameters formed on these soils.Peer reviewe

Andosols of the Canary Islands. (V) Dystrandepts. Morphological and chemcial characteristics

13 páginas, 5 tablas.The authors studied the morphological and chemical characteristics of Dystrandepts as they are formed in Tenerife island. They are situated at a mid-distance from the main eruptive centres. The profils are developed under a vegetation of ericas-fayal-pine, in the north slopes of Tenerife at an altitude of 1200-1300mts. Determination of +/- value, pH, amorphous materials, total bases, exchangeable bases and organic matter are given.Peer reviewe

Andosols of the Canary Islands. (II) Intergrades andosol-oligotrophic brown earth. Morfological and chemical characteristics

17 páginas, 5 tablas.In this paper, the andosols of the Canary islands (Tenerife, Gomera, Hierro), specially the intergardes andosol-oligotrophic brown earth, are studied from the standpoint of their main morfological and chemcial characteristics. organic matter, pH, amorphous materials, exchange capacity, exchange bases, total bases, +/- value, are studied and the figures obtained agree with the value accepted for these types of soils.Peer reviewe

Andosols of the Canary Islands. (I) General cahracteristics of these soils

24 páginas, 5 tablas, 1 gráfica, 3 mapas.The authors studied the main characteristics of the andosols, with special reference to the types present in the Canary Islands (Tenerife, Gomera, Hierro). They describe their main morfological, physical, chemical and mineralogical characteristics. Considerations on the ecological conditions and age of the soils are given with reference to the main types described. Climate, topography and age are among the main factors controling the typology of these soils.Peer reviewe

Andosols of the Canary Islands. (XI) Physical characteristics of different groups

17 páginas, 6 tablas, 6 gráficas.In this paper we study the physical characteristics of three groups of andosoils: 1) Dystrandepts, 2) Vitric andosoils strongly desaturated, and 3) Vitrandepts. Considerations are given about the macro and microporosity, pF, densities and granulometric characteristics refered to all the different horizons of each profil.Peer reviewe

Climatoséquence de la région méridionale de l'ile de Ténérife (Iles Canaries). 2e partie : caractéristiques minéralogiques ; interprétation et classification

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