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Presentation on theme: "; Soils = soilscape = geopedological setting. OUTLINE INTRODUCTION THEORETICAL BACKGROUND AND ILLUSTRATIVE EXAMPLES CONCLUSION."— Presentation transcript:

1 ; Soils = soilscape = geopedological setting


3 INTRODUCTION: Soil definition A natural body consisting of layers (or horizons) of mineral (and/or organic constituents) of variable thickness, which differ from the parent material in their morphological, physical, chemical, and mineralogical properties and their biological characteristics S = f (Cl, O, R, P, T,……M)

4 Definition : A soil = pedon is the smallest volume with a surface extent which varies from about 1 to 10 m² Soil samplePedons/ polypedons in soilscape

5 Definition: Pedon / polypedon For mapping purposes, similar pedons are pooled together, forming a polypedon, obviously associated with variability, depending on scale

6 Functions: What does soil do? 1- Soil provides the required setting for water, nutrient, air, and heat exchange for living organisms. 2- Soil controls the water distribution;affects the movement of soluble materials. 3- Soil regulates biological activity and molecular exchanges among solid, liquid, and gaseous phases. 4- Soil acts as a filter to protect the quality of water, air, and other resources.

7 What does soil do? 5- Soil provides mechanical support for living organisms and their structures. People and wildlife depend on this function. 6- Soils act: - as an archive (=history book of the landscape), - as a guide, and - as a predictor

8 Soils speak out; an account of the past, present, and future THEORETICAL BACKGROUND AND ILLUSTRATIVE EXAMPLES

9 An account of the past, present, and future Past Paleoecology Present Soil Management Future Soil Degradation/ Conservation

10 Past: Paleoecology

11 History book of the landscape (archive) Examples of features revealing paleoecology: 1.Pedogenic (horizons): * Anthropic, * Plaggen, etc * Argillic, *Agric, etc 2. Geomorphic (features): * Glacis formation:Tunisia, Morocco * Travertine (karstic): Iran

12 1. Pedogenic (horizons)

13 2. Geomorphic; glacis formation 2.1 Tunisian example: Pedimentation/ planation : in practice, erosional glacis – adjacent to the mountain front is followed by an accumulation glacis. A fan distinguishes itself from the glacis by being associated with a distributary (dichotomic) drainage pattern.

14 2. Geomorphic; glacis formation 2.2 Moroccan example Erosional glacis terraces Accumulation glacis

15 2. Geomorphic; glacis formation 2.3 Iranian example Stereogram depicting glacisPedostratigraphy (approving)

16 2. Geomorphic features Karstic springs; Travertine Karst spring (dried out) Travertine in scattered patches

17 Microgram of travertine speciman

18 Iran: A wetter climate, karstic springs where travertine is spread out; Once upon a time (27000 yr BP-13000 yr BP) the study area was subject to cycles of erosion and sedimention, also approved by the occurrence of Argillic and Petrocalcic horizon ; Aridification has never been as degrading as it is today Morocco: Occurrence of Ultisols and Plinthite implies a wetter and hotter climatic condition Different vegetation cover

19 Present: Soil- management

20 Present : Soil Management Guiding features: *Soil properties (Physico-chemical): particle size class, depth, pH,…… *Position in landscape (Site)

21 When well managed Traditional wooden device for plowing; pulled by oxen

22 When mis-managed

23 Future: PredictionA soil survey describes the characteristics of the soils in a given area, classifies the soils according to a standard system of classification, plots the boundaries of the soils on a map, and makes predictions about the behavior of soils.(SSM, 1993)

24 Future : Prediction regarding (possible) land degradation Guiding features: Pedon (individual soil body) Diagnostic soil characteristics - Abrupt textural change - COLE (coefficient of Linear Extensibility) - (Para-) Lithic contact,……..


26 Change of erosion base-level: gully formation and landslide Landslide Bushes hold soils together The gully Gully running perpendicular Landslide It is clearly seen that the gully in the bottom of the vale (fig c) is triggering; landslide has occurred once the slope has been de-bushed (cleared) Fig. c

27 Gullies formed Bush land Cereals Ploughed for Vine tree plantation Gully Boundary between 2 soil series

28 Incision (gully) occurs in a joint, the weakest line between two pedons

29 If you want to conserve the environment Listen to what soils say Prevention is better than cure CONCLUSION:

30 Is check-dam solving the problem?! Slump Check- dam does not help The first check dam Second trial Water goes like this; neglecting the dam



33 Rferences Rosa M.Poch (editor- in- Chief) and Kovda, Irnia and Curtis Monger (Guest editors). 2013.1st volume of the proceedings of the 14th IWMSM. Departament de Medi Ambient i Ciències del Sòl Universitat de Lleida Av. Rovira Roure 191, 25198 Lleida (Catalonia) Buol, S.W., Hole, F.D., and R.J. McCracken. 1973. Soil Genesis and Classification. The Iowa State University Press, Ames. Farshad, A. 2006. Introduction to Applied Geomorphology for Soil Scientists (Geopedologists). Lecture-notes, Department of Earth System Analysis (ESA), ITC, Enschede, The Netherlands. USDA, 1975. Soil Taxonomy, A Basic System of Soil Classification for Making Interpreting Soil Surveys. Soil Survey Staff. Agricultural Handbook No. 436. Zinck, G.A. 1988/89. Physiography and soils; soil survey courses (Lecture-notes), ITC, Enschede, The Netherlands.


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