The relationship between hydrodynamic properties and weathering of soils derived from volcanic rocks, Galapagos Islands (Ecuador)

被引：31

作者：

Adelinet, M. ^{[1
]}

Fortin, J. ^{[1
]}

D'Ozouville, N. ^{[2
]}

Violette, S. ^{[2
]}

机构：

[1] Ecole Normale Super, Geol Lab, UMR 8538, F-75231 Paris, France

[2] Univ Paris 06, UMR 7619, Paris, France

来源：

ENVIRONMENTAL GEOLOGY | 2008年 / 56卷 / 01期

关键词：

Physical soil properties; Hydraulic conductivity; Mineralogical composition; Galapagos Islands;

D O I：

10.1007/s00254-007-1138-3

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The aim of this interdisciplinary study is to examine a component of the hydrological cycle in Galapagos by characterizing soil properties. Nine soil profiles were sampled on two islands. Their physical and hydrodynamic properties were analyzed, along with their mineralogical composition. Two groups of soils were identified, with major differences between them. The first group consists of soils located in the highlands (> 350 m a.s.l.), characterized by low hydraulic conductivity (< 10(-5) m s(-1)) and low porosity (< 25%). These soils are thick (several meters) and homogeneous without coarse components. Their clay fraction is considerable and dominated by gibbsite. The second group includes soils located in the low parts of the islands (< 300 m a.s.l.). These soils are characterized by high hydraulic conductivity (> 10(-3) m s(-1)) and high porosity (> 35%). The structure of these soils is heterogeneous and includes coarse materials. The physical properties of the soils are in good agreement with the variations of the rainfall according to the elevation, which appears as the main factor controlling the soil development. The clayey alteration products constrain soils physical and hydrodynamic properties by reducing the porosity and consequently the permeability and also by increasing water retention.

引用

页码：45 / 58

页数：14

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