Introducing the GIS-Based Ecological Carrying Capacity Model of Nutrition Resources

The GIS-based Ecological Carrying Capacity Model of Nutrition Resources (ECCNR-GIS) software is a new approach based on rangeland assessment and the estimated energy content of forage. This software is derived from Badjian (2005) following studies on the ecological capacity model of livestock feed resources in Bakkan plain area, Southern Iran. ECCNR-GIS software is designed to calculate the regional ecological carrying capacity based on available forage resources and considers the energy metabolism (ME) requirements in relation to livestock management to estimate the animal needs. ECCNR-GIS software is written in Visual Basic, as a set of mathematical equations that represent a system of relations between production subsystems. The software is based on conceptual models and measurements taken from rangeland, agricultural fields and animal herds of Joobkhale region in Southern Iran. These subsystems include rangeland production as the main forage resource of the region together with farm byproducts that also play a significant role in the area. The current status of the rangelands does not meet the needs of the animal and hence the need to incorporate agricultural crops and residues. The model estimates the amount of energy produced from agricultural residues to determine overall nutritional supplies and carrying capacity