On 5 March 1987 two earth tremors caused topsoil and turf overturning, cracks in the ash mantle, and probably also cracks in soil profiles. In seismically active regions such episodic events may substantially influence soil profile development.
The influence of slope aspect on soil weathering processes in the Springerville volcanic field, Arizona
Arizona ; Geochemistry ; Pedogenesis ; Slope ; Slope gradient ; United States of America ; Volcanicsoil ; Volcanism ; Weathering
A comparison was made between soils on north- and south-facing slopes of cinder cones in the Springerville volcanic field (SVF), in order to determine the influence of slope aspect on soil weathering processes. Accelerated rates of weathering
and soil development were found to occur in soils on south-facing slopes while no trend with aspect was found for eolian additions. Accelerated rates of weathering and soil development may influence cinder cone degradation and cone morphology.
Soil variation with altitude on Volcan Barva, Costa Rica
Altitude ; Barva volcan ; Costa Rica ; Géographie physique ; Montagne ; Propriété du sol ; Pédologie ; Sol ; Zonation altitudinale ; Zone intertropicale
The AA. examine the hypothesis that soil chemical properties other than nitrogen supply partly explain the altitudinal changes in the rain forest. They also compare the soils on Volcan Barva with those on several other tropical mountains to see
if differences in soil chemistry are likely to be the cause of differences in forest structure between mountains.
Volcanic ejecta largely contributed to landscape building also very far from volcanic areas, providing substratum for soil genesis. The AA. studied the role of pyroclastics as soil forming factor on the carbonate relieves in the Partenio Mountain
Erodibility and runoff-infiltration characteristics of volcanic ash soils along an altitudinal climosequence in the Ecuadorian Andes
Andes ; Ecuador ; Erodibility ; Land use ; Pedogenesis ; Rainfall simulation ; Runoff ; Slope gradient ; Soil erosion ; Soil properties ; Volcanicsoil
The aim of this research was to study erodibility and runoff-infiltration characteristics of volcanic ash soils of a climate-induced altitudinal Entisols-Inceptisols-Andisols sequence on the slopes of a volcanic peak in the Andes of northern Ecuador
, and to relate observed erodibility values to those determined for other soils in different parts of the world.
Exploration of soils developing on volcanic materials on the island of Milos, Greece
Clay mineral ; Cyclades ; Greece ; Island ; Mediterranean climate ; Pedogenesis ; Soil classification ; Soil properties ; Volcanic rock
of the soils developing on these volcanic deposits and their classification. Samples were taken from 7 locations of soil on different parent material and of different ages. These soils do not exhibit andic properties and hence cannot be classified as Andisols
The island of Milos, part of the South Aegean volcanic arc with a typical Mediterranean climate, is covered with volcanic deposits of different ages. The aim of this study was to investigate the physicochemical and mineralogical properties
. The silica saturation index (ISS) may be used for these soils to describe a pedogenetic environment rich in Si which favours the formation of pedogenic amorphous silica. The climate is the major determinant of the evolution of these soils.
[b1] Lab. of Soil Science and Agricultural Chemistry, Athens, Grece
The main purpose of this study is to examine if the soils that are forming on volcanic materials under a dry Mediterranean climate, in Nysros Island, meet the requirements to be classified as Andisols. Soils from 7 sites were sampled and examined
Spatial variability of soils developing on basalt flows in the Potrillo volcanic field, southern New Mexico : prelude to a chronosequence study
Aquifer ; Arid area ; Basalt ; Chronosequence ; Natural recharge ; New Mexico ; Soil ; Soil properties ; Spatial variation ; United States of America ; Volcanic rock
This study seeks to improve the accuracy of a future soil chronosequence study in the Potrillo volcanic field by : further evaluating the evolution of basalt flow surface topography with time; identifying the systematic variability of soils
Estimation of allophane and halloysite in three sequences of volcanicsoils, New Zealand in Volcanicsoils. Weathering and landscape relationships of soils on tephra and basalt.
Soil-elevation relationships on a volcanic plateau in the Southern Cascade Range, northern California, USA
Altitude ; California ; Chronosequence ; Pedogenesis ; Precipitation ; Soil ; Soil properties ; Temperature ; United States ; Vegetation ; Volcanic rock
This paper presents the main features of an altitudinal sequence. They were determined from mapping soils on a late cenozoic volcanic plateau west-southwest of Lassen Peak, and from the analyses of 27 pedons sampled from 270 to 2 030 m above sea
Occurrence and hydrological effects of water repellency in different soil and land use types in Mexican volcanic highlands
Ecosystem ; Forest ; Land use ; Mexico ; Michoacán ; Permeability ; Pyroclastic ; Soil erosion ; Soil properties ; Vegetation ; Volcanic ash ; Volcanicsoil ; Water erosion
In this study the occurrence and hydrological effects of water repellency were investigated at a plot scale for different types of land use and volcanicsoils in Mexican volcanic highlands from Michoacan, Mexico: [1] fir, pine and oak mixed forest
soils developed from lavas, [2] soils developed from volcanic ashes and pyroclastic sediments under sparse fir, pine and oak forest and shrubland, [3] pine and oak forested soils developed from lavas and pyroclastic sediments, and [4] bare soils
on recent ash sediments in plain surfaces. Shallow and irregular wetting fronts were observed at water-repellent zones, reducing the soil water storage capacity. The implications of soil water repellency in soil hydrology and erosion risk in the area shed
light on the soil hydrology of the studied ecosystems, and can contribute to develop better management policies.
[b3] Lab. Soil Science, San Nicolás de Hidalgo Michoacan Univ., Morelia, Mexique
Heretofore very little research has been done on a specific soil type in Hungary called „erubáz”, which develops on volcanic rocks. Its largest uniform and unbroken spot is located in the central part of Börzsöny Mountains (High Börzsöny
). It is assumed that in reality this spot extends beyond its contours indicated in the soil map of the area. The main objective of the study is to carry out a detailed analysis of this soil type and to identify its subtypes and varieties. - (AM)
Cumulic soils on Rakata, Sertung and Panjang (Krakatau Is.) and properties of each Solum
Clay mineral ; Indonesia ; Island ; Pedogenesis ; Pyroclastic ; Soil ; Soil properties ; Taxonomy ; Volcanic eruption ; Volcanism
Comparison of the properties and development of soils mainly derived from the re-deposited 1883 pyroclastic flows on Rakata, Sertung and Panjang (Krakatau islands).
Regional variability of volcanic ash soils in south Ecuador : the relation with parent material, climate and land use
Agricultural land use ; Andes ; Ecuador ; High mountain ; Organic materials ; Soil ; Soil properties ; Spatial variation ; Volcanicsoil
the soil properties, and to relate the spatial variability of these properties to the major trends in parent material, volcanic ash deposits and climate. The impact of human activities on the soil properties is assessed in a case study in the Machangara
In this high Andes region, the land use changes affect particularly the páramo. The AA. analyse the regional variability of the soils in the south Ecuadorian rio Paute basin. Data from soil profiles along north-south transects are used to determine
This study established the relationship among different soil properties such Al-, Fe-complexes and allophane content on soil C levels in Chilean volcanicsoils as well as the effect of soil pH on metal–OM complexes. A total of 45 soil samples from
15 soil pedons were sampled. The soil samples were analysed for the content of soil organic C, allophane, clay, silt and Na- pyrophosphate extraction (Alp, Fep, Cp) and soil pH (water). The AA. examined the relationship between the soil C content
and soil properties using simple and multiple linear regressions. The silt and clay contents explained little, while the allophane, soil pH and Alp explained most of the soil C variation. In contrast to the top soil, SOM in the subsoil was saturated
with Alp and Fep. Soil pH and metal : soil C ratio regulates SOM–allophane association in the soil profile.
This study was undertaken on an experimental farm in proximity to the city of Tumbaco, near the Ilaló volcano, 20 km east of Quito. The material derived from the fragmentation of the hardened volcanic ashes is stongly prone to pluvial erosion
. Rainfall simulation was implemented before and after 3 cycles of cultivation to assess the evolution of soil structure and its susceptibility to erosion. The preferred option for land with these soils would be no tillage and a permanent soil cover (pasture
High-concentration levels of heavy minerals in two volcanicsoils from Colombia : a possible paleoenvironmental interpretation in Volcanicsoils. Weathering and landscape relationships of soils on tephra and basalt.