بررسی طرح ملی ارزیابی مراتع مناطق مختلف آب و هوایی ایران - استان سمنان

Assessment rangelands and recognize of variation in range cover and yield variation due to effective factors important for management planning and correct management. Information of rangeland assessment necessary for creating and update data base and advising range users and government agency working in Mazandaran were determined. In each community one permanent site including four parallel, 400 meter transect as established. Canopy cover and yield assessed within 60 one square meter quadrates. The results indicated that means of canopy cover and yield in 10 sites is 50.22% and 417/87 kg/ha in 2004 which highest in compare with other years.Means of canopy cover and yield in 10 sites 47.38% and 391.46 kg/ha and 391.63 kg/ha in 2002 and 2003 which is lowest in compare with other years. Canopy cover and yield related to precipitation in sites. At sites Which located in elevation areas with cold mediterranian climate have desirable condition in compare with low elevation sites with semi-arid climate. The rangelands sites in sagebrush areas dominated by Palatability 3 class rangeland plants.

کلیدواژه ها:

مراتع ، تاج پوشه ، ارزشیابی ، پوشش گیاهی ، سمنان