Scientific paper / Artículo científico SOIL SCIENCE pISSN:1390-3799; eISSN:1390-8596 http://doi.org/10.17163/lgr.n28.2018.03 ALTITUDINAL VARIATIONS IN H AND AL IONS INTERCHANGE ALONG WITH F E CONTENT IN AMAZONIAN RAINFOREST SOIL VARIACIONES ALTITUDINALES EN IONES DE H Y AL EN EL CONTENIDO DE F E EN SUELOS DE LA SELVA AMAZÓNICA Ankit Singla 1,∗ , Gabriela Bautista 2,∗∗ , Bence Mátyás 3,∗ , Vanessa Serrano 4 , Juan Morales Arteaga 4 , Renato Gabriel Sánchez 2 , Rubén Darío Bracho Velásquez 5 , Lenin J. Ramírez-Cando 6 1 Regional Centre of Organic Farming Department of Agriculture, Cooperation and Farmers Welfare, Ministry of Agriculture & Farmers Welfare, Government of India, Bhubaneswar, Odisha, India. 2 Independent researcher, Quito, Ecuador. 3 Research group of Environmental Sciences (GRICAM), Universidad Politécnica Salesiana, Quito, Ecuador. 4 Environmental Engineering, Universidad Politécnica Salesiana, Quito, Ecuador. 5 Mechanical Engineering, Universidad Politécnica Salesiana, Quito, Ecuador. 6 Research group for sustainable environments Sustentable (GIADES), Universidad Politécnica Salesiana, Quito, Ecuador. *Singla A., Bautista G. and Mátyás B. contributed equally to this work. **Corresponding author: gebautista89@gmail.com Article received August 20, 2018. Accepted, after revission on: August 24, 2018. Published on: September 1, 2018. Abstract Soils vary broadly across Amazonia having a large diversity of soil types, morphological characteristics and physical- chemical soil properties. Research that examines the soil properties of these areas improve the general knowledge of native, unexplored soils and provides promising control samples for soil science. There are important investigations in the literature that examine the Amazonian forests grow in a heterogeneous environment in relation to soil and topography. In this study soil samples of 3 depths and from 9 different altitudinal locations of Amazonian rainforest were collected. The present study provides the insight about the effects of soil depth as well as altitudinal variations on Fe content and interchangeable acidity (H-Al ion interchange). This study indicated that altitude compared to soil depth can play major role in Fe content and Interchangeable acidity. Keywords: Rainforest, Control soil, Amazonian soil, Altitudinal variation, H ion, Al ion. Fe content. 42 LA GRANJA:Revista de Ciencias de la Vida 28(2) 2018:42-50. c 2018, Universidad Politécnica Salesiana, Ecuador.