TY - JOUR T1 - Reactions of Festuca ovina L underground organs to different grazing intensities (case study: Ghorkhod region of North Khorasan province) TT - واکنش اندام های زیر زمینی گونه Festuca ovina L به شدت های مختلف چرای دام (مطالعه موردی علفزارهای نیمه استپی قرخود در خراسان شمالی) JF - gnbd-pec JO - gnbd-pec VL - 1 IS - 2 UR - http://pec.gonbad.ac.ir/article-1-65-en.html Y1 - 2013 SP - 81 EP - 93 KW - Keywords: Festuca ovina L. KW - Grassland KW - Underground organs KW - Grazing intensity KW - Semi-steppe N2 - Abstract Festuca ovina is a perennial plant of the Graminae family that is a palatable and a highly productive species in rangelands and plays an important role for soil conservation. Due to the importance of roots for plant stability and soil conservation, in this research, the role of different treatments on the weight and length of plant underground organs were investigated. In each treatment (light grazing, moderate grazing, heavy grazing and no grazing), four 50 meter transects were randomly placed and 10 species were sampled on each transect using the nearest neighbor method. Overall, 160 plant species were sampled for experiment. After separating the aerial and ground organs and weighing their dry matters, data were analyzed to investigate the influence of grazing using ANOVA, tukey and Tstudent test in SPSSver16. Results showed that different intensities of grazing influenced the biomass of the aerial and ground parts of the plant. The result of the T test representing the height and weight of this plant in different grazing intensities had significant differences (P M3 ER -