New Approach to Soil Formation in the Transitional Landscape Zone: Weathering and Alteration of Parent Rocks


Nur Ainun Pulungan, Junun Sartohadi

Abstract


Background and Objectives: Many studies have addressed the relation of soil formation and weathering. However, in the transitional landscape zone the soil formation is resulting not only from weathering process but also from alteration of parent rocks. The comparison of soil formation rates due to both processes is not studied yet. In Java, a transitional landscape zone is widely formed, and causes different types of soil formation in particular areas. The objective of this study was to compare the common concept of parent rock weathering with the concept of parent rock alteration in the soil formation. Materials and Methods: Purposive soil sampling was applied to collect the soils derived from weathering process and alteration. Laboratory analyses were applied to assess physical and chemical properties of soils. XRPD and XRF analyses were also conducted for mineralogical analysis.  Results: The results showed that soil on weathered materials had brownish to grayish color, less than 30% of clay, 20-70 meq/100gr of CEC, 1.8-4.3% of organic matter, medium to high cation bases and base saturation. While soils on altered materials showed reddish to orange color, contained more than 60% of clay, <10meq/100 gr of CEC,1.4-2% of organic matter, and very low cation bases and base saturation. Difference of mineral properties of soil developed on weathered- and altered materialswas shown by the presence of hematite. XRF results showed that weathered materials contained by SiO2> Fe2O3> Al2O3, however, altered materials contained by SiO2> Al2O3> Fe2O3. Conclusion: It was concluded that in the transitional landscape zone, the soil formation was not always started by parent rock weathering. Weathering process resulted in top down process of soil formation. Alteration resulted in two processes of soil formation (bottom-up and top-down).

Keywords


Soil formation, Weathering, Alteration, Transitional zone, Landscape

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About this article

Title

New Approach to Soil Formation in the Transitional Landscape Zone: Weathering and Alteration of Parent Rocks

Keywords

Soil formation, Weathering, Alteration, Transitional zone, Landscape

DOI

10.20448/journal.505.2018.51.1.7

Date

2018-03-09

Additional Links

Manuscript Submission

Journal

Journal of Environments
Vol 5, No 1 (2018) Page: 1-7

Online ISSN

2313-660X

Statistics

160 Views | 111 Downloads

Citations

0

Authors & Affiliations

Nur Ainun Pulungan
Institute of Geography, Faculty of Geo- and Atmospheric Sciences, University of Innsbruck, Innsbruck, Austria; Faculty of Agriculture, Gadjah Mada University, Yogyakarta
Indonesia

Junun Sartohadi
Faculty of Agriculture, Gadjah Mada University, Yogyakarta
Indonesia


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Journal of Environments
Online ISSN: 2313-660X

 

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