Seyyed Ali Hosseini; Ali Ehsani
Volume 24, Issue 3 , October 2017, , Pages 635-645
Taghi Mirhaji; Farhang Ghasryani; Farhad Azhir
Volume 22, Issue 1 , June 2015, , Pages 184-193
Abstract
This research was aimed to determine the allowable use of Bromus tomentellus, Festuca ovina and Stipa hohenackeriana in Firouzkooh rangeland during 2006 to 2010. Treatments included different harvesting intensities of 25%, 50%, 75% and control, performed on 40 medium-sized individuals of each species. ...
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This research was aimed to determine the allowable use of Bromus tomentellus, Festuca ovina and Stipa hohenackeriana in Firouzkooh rangeland during 2006 to 2010. Treatments included different harvesting intensities of 25%, 50%, 75% and control, performed on 40 medium-sized individuals of each species. Data were analyzed in a split plot in time design by SAS software and means were compared using Duncan. Results showed that the effects of treatment, year, and interaction effect of year*treatment were significant at 1% level of significance. In addition, the results of mean comparisons showed that the reduced forage yield was under the influence of harvesting intensities. In this regard, S.hohenackeriana and B.tomentellus were sensitive to drought while F.ovina was resistant to drought and more affected by the harvesting intensity. Our results clearly showed that a harvesting intensity of 25% and control treatment had no impact on the yield of species, leading to the reduced forage yield of the mentioned species. Therefore, an allowable use of 50% is recommended.
Kazem Saedi; Adel Sepehri; Mohammad Pesarakli; Hosein Gharedaghi; Reza Azizinejad
Volume 21, Issue 3 , December 2014, , Pages 518-529
Abstract
In most Iranian rangelands, continuous grazing begins with melting snow and continues until the beginning of snow. This study was conducted to evaluate the effects of continuous grazing system on a number of morphological attributes of Bromus tomentellus and Ferula haussknechtii during 2010-2011 in Saral ...
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In most Iranian rangelands, continuous grazing begins with melting snow and continues until the beginning of snow. This study was conducted to evaluate the effects of continuous grazing system on a number of morphological attributes of Bromus tomentellus and Ferula haussknechtii during 2010-2011 in Saral Rangelands of Kurdistan Province. The 30-year exclosure was selected as control area inside the Saral Research Station. In different growth stages, the morphological attributes including the shortest and longest basal area diameter, the shortest and longest canopy diameter, and the height of 10 plants were measured. The annual yield of 30 plants of each species in each year was clipped and weighed to determine forage consumption intensity. All data were subjected to statistical analysis in a completely randomized design using combined analysis. Mean comparisons were performed using Duncan’s Multiple Range Test. Continuous grazing caused to the increase of basal area diameter and canopy diameter of B. tomentellus significantly; however, the height varied in two studied treatments, depending on the year. The three studied morphological attributes of F. haussknekhtii were affected drastically by continuous grazing. In this species, basal area diameter was more affected by the conditions of the year. In both species, ungrazed plants used seasonable rainfall more efficiently as compared to the grazed plants.
Hamid reza Mirdavudi; Abassali Sanadgol
Volume 16, Issue 2 , December 2009, , Pages 190-199
Abstract
In this research, first of all the key and important species as well as associated species of rangelands were recognized, then morphological and seasonal changes and preference value were determined on the selected species such as Artemisia aucheri, Kochia prostrata, Bromus tomentellus, Asperula glomerata ...
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In this research, first of all the key and important species as well as associated species of rangelands were recognized, then morphological and seasonal changes and preference value were determined on the selected species such as Artemisia aucheri, Kochia prostrata, Bromus tomentellus, Asperula glomerata and Buffonia cf.koelzii. In this research phonological stages of plants divided into 3 main stages including vegetative, flowering and seed maturity. Species preference values were studied with the method of time measurement. Effective factors on species palatability such as morphological characteristics, phonology, and chemical factors (Carbohydrates, Hemi cellulose, Protein…) of the species also were investigated. In the final step, data obtained in measurement time method were compared with environmental and morphological characteristics of the species as well as forage quality. The palatable species such as Bromus tomentellus, Asperula glomerata, Buffonia cf.koelzii and annual grasses were severally grazed in early time of the season. Rate of the grazing of, the species As. glomerata, Bu. cf.koelzii, Br. tomentellus and Ar.aucheri were 56, 59, 74 and 43 percent respectively. The laboratory analysis of forage quality also showed that there are positive correlation between moisture, protein and soluble sugar percentage with rate of forage use percentage. The regression equation showed that the amount of humidity, protein and soluble sugar with 56, 21 and 10 percent respectively shared in this model and high correlation of these factors showed their important role.
Hosein Tavakoli; Abbas ali Sanadgol; Uosef Garivani
Volume 13, Issue 2 , February 2006, , Pages 69-73
Abstract
Russian brome (Bromus tomentellus) is a prennial grass with good adaptability to climatic condition of north Khorasan. So, it has promise for using in range improvement projects. Because threre is no enough local information about mangement of this plant, the present experiment has been conducted in ...
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Russian brome (Bromus tomentellus) is a prennial grass with good adaptability to climatic condition of north Khorasan. So, it has promise for using in range improvement projects. Because threre is no enough local information about mangement of this plant, the present experiment has been conducted in Sisab Reaserch Station (SRS) to evaluate the response of this species to grazing intensities and rest grazing. Four grazing intensities of light (20 to 45% of forage removal), moderate (45- 65% of forage removal), heavy (65- 80% of forage removal) and without grazing as control applied by herd of lamb and sheep for three consequent years from 1999 to 2001. The year of 2002 considered as rest period from grazing. Herbage mass and number of plant per unit area measured as an index response. Herbage mass production decreased by reduction in precipitation. Heavy grazing resulted in significant reduction in herbage production and number of plants per unit area, but one year rest from grazing componsated the negative effect of intensive grazing on herbage mass reduction. Management implication based on this results show that plant can tolerate grazing intensity by 45-65% of herbage removal and indicate on the importance of rest grazing on survivance of this plant.