tailieunhanh - Báo cáo " Preliminary study of weathering crust for changing plantation "

In Vietnam, weathering crust has been intensively studied from different aspects. However, this paper is the first attempt to study on changing plantation. The following methods are used: analysis of weathering factors in natural balance; geochemical method for studying the major and trace elements; comparing weathering crust with the standard one on which a known assemblage of plants is well developed. The results reveal that: the feralite weathering crust is suitable for litchi, . | VNU Journal of Science Earth Sciences 23 2007 231-234 Preliminary study of weathering crust for changing plantation Dau Hien Vu Van Ha Mai Thanh Tan Institute of Geological Sciences Vietnamese Academy of Science and Technology Received 23 March 2007 received in revised form 28 September 2007 Abstract. In Vietnam weathering crust has been intensively studied from different aspects. However this paper is the first attempt to study on changing plantation. The following methods are used analysis of weathering factors in natural balance geochemical method for studying the major and trace elements comparing weathering crust with the standard one on which a known assemblage of plants is well developed. The results reveal that the feralite weathering crust is suitable for litchi longan and some others the magalite weathering crust on the karst field is suitable for tea coffee sugar-cane etc. the saprolite weathering crust is suitable for bamboo group The ferosialite weathering crust depending on the bedrock is suitable for many different tree groups The sialite weathering crust is suitable for Cinnamon Illicium Verum. These study results may be supplemented to achieve a sound orientation in changing plantation. Keywords Weathering crust Plantation change Hoa Binh Province. 1. Introduction Vietnam is a humid tropical country where the weathering process is strongly developed leading to rapid and extensive formation of weathering crust. After the work of Fritland 1 weathering studies in Vietnam were intensively carried out and their results have not only theoretical but also practical significance in prospecting mineral resources. However a change of plants one pressing demand of current socio-economics makes a new orientation in weathering study. Since the depths of most industrial and fruit plant s root have been beyond the pedological study which is limited in the surface soil layer this new Corresponding author. Tel. 84-912342465 E-mail maithanh_tan@ orientation

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