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International Institute for Geo-Information Science and Earth Observation (ITC) 2003

Land evaluation for land use planning with especial attention to sustainable fodder production in the Rouzeh Chai catchment of Orumiyeh area, Iran

Bani Neameh, J. (Jamal)

Titre : Land evaluation for land use planning with especial attention to sustainable fodder production in the Rouzeh Chai catchment of Orumiyeh area, Iran

Auteur : Bani Neameh, J. (Jamal)

Etablissement de soutenance : University of Twente International Institute for Geo-Information Science and Earth Observation (ITC)

Grade : Master of Science in Geo-Information Science and Earth Observation 2003

Résumé
The study area is located in the western part of the Azarbayejan province in northwestern of Iran. The surface area is about 28,000 ha. The study area has cold and moist winters and mild summers. The mean annual rainfall is about 367mm ; the mean annual temperature is 12.2 ° c. The average annual evaporation is almost 1051mm. The Rouzeh Chai river is the main river with a mean annual discharge of 1.5 m3 /s. Lithologically, the study area includes three main groups : metamorphosed rocks, sedimentary rocks and alluvial deposits. Geomorphologically, the catchment consists of five landscapes : Mountain, Hilland, Piedmont, Plateau and Valley. 13,087 individuals, in 2326 families, inhabit the area. Animal husbandry and farming are the main activities of people. The soils of the area were studied using the geopedologic approach. Five landscapes and 18 landforms were distinguished. The soils were classified down to family level according to the USDA soil taxonomy system (1998). To identify the present landuse, landsat ETM image (2000), for previous landuse TM image (1990) and aerial photographs (1956) were used. Multi - spectral classification and color density slicing for NDVI were done to classify the present landuse. Landuse changes were distinguished by comparing present and previous landuse in order to detect the causes of land degradation. Land suitability evaluation for different Land Use Types (LUT’s) was determined using ALES software. For purpose of evaluation, 5 Land Use Types and 7 Land Qualities (LQ’s) were selected to match with the list of Land Use Requirements (LUR’s) prepared for the area. To obtain physical land suitability class of map units, Land Use Requirements, severity level decision trees and physical suitability subclass decision trees were established, leading to physical suitability subclasses. For Land Use Planning two scenarios defined and evaluated using DEFINITE software. The predefined LUT was realized, using the ranking procedure, followed by area calculation, that is, the surface area that should be covered by each, based on land suitability in class 1 and 2. The main problem of the area is mismanagement of agricultural systems, that is, sloping areas are plowed parallel to the slope direction, and the problem of overgrazing due to shortage of feed for animals, and converting rangelands into the agricultural lands are symptoms of unsustainability in this area. Determining suitable lands in order to increase fodder production will reduce the pressure on rangelands and consequently decrease soil erosion. To comply with the objectives, after preparation of geopedologic map and defining LUT and doing land evaluation using ALES, finally land use options were determined using DEFINITE.

Version intégrale (ITC)

Page publiée le 29 janvier 2018