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A Comparative Study of Element Cycling in the Soil-Plant System: A Case Study of shaly and Calcareous Soils, Southern Benue Trough, Nigeria

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International Journal of Geosciences 2014年第4期5卷 453-463页

作者： T. N. Nganje C. I. Adamu Department of Geology University of Calabar Calabar Nigeria

This study focused on the cycling of major and trace elements in the soil-plant system in parts of Southern Benue Trough, Nigeria. Surface soil samples and cassava crop samples were collected from cultivated farmlands underlined by shaly and calcareous soils and were analysed using standard techniques. The results show that shaly soils are relatively acidic (pH, 4.8 - 6.6) with high level of organic matter content (OM, 3.2% - 8.7%) compared to calcareous soils (pH, 5.6 - 7.2;OM 1.6% - 7.0%). The soils are enriched in elemental composition relative to the world average abundances in soil. The maximum levels of K, Al, and Zn were obtained from shaly soils. The computed accumulation factors are generally leaf > stem. Significant correlation was obtained between elemental associations of calcareous surface soils compared to that of shaly soils. R-mode factor analysis revealed the controls of soil geochemistry to include lithology, anthropogenic and environmental factors. A stepwise linear regression analysis identified soil elemental component, pH and organic matter as some of the factors influencing soil-plant metal uptake.

关键词： Soil Plant System Cycling of Elements Calcareous Soils shaly Soils Southern Benue Trough Nigeria

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Study on the electric property of shaly sand and its interpretation method

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Global Geology 1999年第1期4卷 110-114页

作者： Li Zhoubo and Mo Xiuwen (Changchun University of Science and Technology, Changchun, China, 130026)

There are so many shaly sand conduction models, and most of them are only used in some local area, and have their limitations. So far, there is no theoretical model that can be used commonly and efficiently .In this paper, based on some existing models, and combining with the knowledge of the researched area, we designed out a new conduction model. The total conductivity of the rock is the combining result from free water in inter granular porous, micro pore water and the clay bound water. It can well describe many electric conduction characteristics of shaly sand. In order to make it useable in practice, we also provide some methods for interpreting the pore components with comprehensive logging data.

关键词： shaly sand Conduction model Logging Clay-bound water Micro-pore

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