Soil Orders and Land Use Development

There are twelve major soil orders in the world, of which only seven have been identified in Iran. Due to Iran's climatic conditions, more than 70 percent of Iran is characterized by arid and semi-arid climates, and considering its highly varied topography, most of the land area, excluding miscellaneous lands, belongs to three soil orders: Entisols, Aridisols, and Inceptisols. Alfisols and Mollisols occur exclusively on the northern slopes of the Alborz Mountains and within the coastal plains of the Caspian Sea, where humid to sub-humid climates prevail; together, these soils cover less than three percent of the country. Alfisols are well-suited for agriculture, rangeland management, forestry, and afforestation, but they have limited potential for warm-water and cold-water aquaculture and show no capability for shrimp farming. This order has high potential for rural and urban development, moderate suitability for industrial development, and is also favorable for tourism activities. Aridisols are unsuitable for dryland farming, forestry, afforestation, warm-water and cold-water aquaculture, and shrimp production. They show low to moderate potential for irrigated agriculture, rural development, and rangeland use. Urban development, rural expansion, and tourism are considered appropriate land uses for this soil order. Entisols have suitable potential for urban, industrial, and tourism development; however, they lack the capability for most other land uses. Only limited rangeland use and restricted rural development are considered feasible. Inceptisols have moderate to good capability for agriculture and rangeland management. They are also suitable for forestry and afforestation, but are not appropriate for any form of aquaculture. Their potential for urban and industrial development is low, while they offer moderate suitability for rural development and high tourism potential. Mollisols are well suited to most land uses except aquaculture, for which they show little to no capability. Vertisols are unsuitable for rural, urban, and industrial development as well as forestry and afforestation. However, due to their high natural fertility, they offer strong potential for irrigated and dryland farming and for rangeland management. They show little capability for aquaculture or tourism development. Miscellaneous lands are unsuitable for all major land uses but may possess significant potential for tourism due to their unique natural features.