Determination of Effective Factors on Ecological Species Groups using Logistic Regression in Plour Rangelands, Mazandaran

The distribution of plant communities is based on the tolerance range of plant species to various environmental factors. Thus, recognition of the environmental factors affecting the establishment and distribution of vegetation is efficient for the introduction of native species and using them in the process of restoration of rangeland. Such studies are done using several statistical methods. This research had the goal of investigation using logistic regression in the extraction of relationships between vegetation and environmental factors and was performed in a semiarid region (in Plour rangeland). Environmental factors including 15 edaphic factors, 3 topographic factors and 6 climatic factors were measured. The sampling method was randomized-systematic and 3 vegetation types were recognized in the study area. Logistic regression technique was used to determine effective factors on each plant type and model of plant types. The results showed that the vegetation distribution is mainly related to soil characteristics such as Caco3, WC and climate factors such as mrhs, mmps and and topographic factors such as elevation.