Mohammad Zadbar; Somayyeh Naseri; Mohammad Fayaz
Volume 23, Issue 4 , March 2017, , Pages 744-759
Abstract
Environmental factors including rainfall are the factors affecting palatability of plants and consequently the preference value for animals. In this study, the preference value of plants was determined in Sarakhs (winter rangeland at North-East of Khorassan province) by timing method during 2007 to 2010 ...
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Environmental factors including rainfall are the factors affecting palatability of plants and consequently the preference value for animals. In this study, the preference value of plants was determined in Sarakhs (winter rangeland at North-East of Khorassan province) by timing method during 2007 to 2010 for the two first months of growing season (March and April).The results showed that Artemisia diffiusa, Carex physioides and Poa bulbosa were grazed in all four years by livestock, indicating that these species were more palatable. The preference value of the species differed between drought and normal years.According to the obtained results,a high correlation was found between the grazing time of Poa bulbosa and pervious rainfalls.Also, a significant relationship was found between the grazing time of Carex physioides in March and the rainfall of autumn, January and total rainfall of February and March.A significant correlation was also found between the grazing time of Artemisia diffusa in March, and the rainfall of January, total rainfall of autumn and December, and total rainfall of autumn, January, and February. This research was aimed to determine the seasonal and annual forage preference value with regard to the rainfall fluctuations in Sarakhs rangelands.
Mohammad Zadbar; Hossein Arzani; Mojgan Azemi; Vali ... Mozafarian; ghanbar ali Shad; Faredeh Saghafi khadem; Hossein Tavakoli; Hassan Amir abadi zadeh; Somayeh Naaseri
Volume 18, Issue 2 , September 2011, , Pages 231-243
Abstract
Rangelands play a key role in country's economy not only for livestock grazing but also for soil and water conservation and other services.This research was based upon a national plan of rangeland monitoring performed in different climatic regions of Iran. Three sites including Asalmeh Bajgiran, Tavakal ...
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Rangelands play a key role in country's economy not only for livestock grazing but also for soil and water conservation and other services.This research was based upon a national plan of rangeland monitoring performed in different climatic regions of Iran. Three sites including Asalmeh Bajgiran, Tavakal bagh Quchan and Shah jahan Esfarayen were selected based on the vegetation cover which represents a part of vegetation of mountainous rangelands in north Khorasan.The experiment was carried out on six linear transects, each transect included ten quadrates of 1.1 m2 and canopy cover, density and plant production were monitored during the period of four years (2004 to 2007).Average of the canopy cover in the mentioned sites were 69.94% ,41.38% and 48.44% respectively, containing perennial grasses, shrubs, grass-like species, and annual or perennial forbs. Average of the annual production was obtained as 654, 356 and 506 (kg/ha/year) respectively.In Asameh rangeland, there is no spring for drinking water and that is why livestock grazing is light with a good condition of vegetation. In Tavakal Bagh, grazing time is longer due to the vicinity to the village. In Tavakal Bagh and Shah Jehan Esfarayen early and heavy grazing are observed. Therefore, with regard to the same precipitation, it could be concluded that grazing is the effective factor in reduction of the range lands production.