اثر عوامل محيطي بر پراكنش گونه هاي مرتعي در منطقه هزار جريب بهشهر(مطالعه موردي: مراتع سرخ گريوه)

The effect of environmental factors on distribution of range species at Hazar jarib area of Behshaher, Iran (Case study:Village Sorkhgriveh)

Sound and efficient management of natural resources are based on specific quantitative and qualitative relation of vegetation parameters and environmental factors. Understanding the effects of environmental factors on establishment and distribution of plants could help us to recognize the adaptation of native species in each region and to manage natural resources based on the nature of these species. To study these relationship, summer ranges of Hazar Jarib were selected which are located at south eastern of Mazandaran province. The objectives of this research were to find the effects of environmental factors on vegetation parameters and to recognize the most important environmental characteristics of establishment and distribution of these range species. The map of plant communities was provided and after overlapping with maps of slope, aspect, and elevation, the study area girded with 1*1 polygons and for sampling, based on area of plant communities, 60 random points were selected. In each of sampling point, the vegetation parameters such as canopy cover, density, and frequency were measured on the minimal area plots of 1 and 4 m2 and the importance values of dominant species were calculated. Soil samples were collected at 30 cm and the soil parameters of texture, moisture, pH, EC, and organic matter were determined. The data were analyzed by using CCA and multiple regressions. The results indicate that the most soil characteristics in establishment and distribution of species are moisture pH and topographic factor of elevation has dominant effects on cushion plants.