Masoud Borhani; Hosein Arzani; Mehdi Basiri; Mohammad Ali Zare Chahouki; Mehdi Farahpour
Volume 21, Issue 3 , December 2014, , Pages 530-540
Abstract
In order to investigate the effects of range management plans on cover, production, litter, and regeneration of plants in Semirum rangelands, 54 sites including 29 with plan and 25 without plan were selected. The implementation of range management plans resulted in the decrease of stocking rate, affecting ...
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In order to investigate the effects of range management plans on cover, production, litter, and regeneration of plants in Semirum rangelands, 54 sites including 29 with plan and 25 without plan were selected. The implementation of range management plans resulted in the decrease of stocking rate, affecting the improvement of vegetation. According to the obtained results, no significant differences were found for the mean total cover, production and number of seedlings between two managements (P<0.05), while in the sites with plan, the cover, production and number of seedlings of class 1 plants, and cover and production of perennial grasses were significantly more than those of the sites without plan. This result was also true in the case of litter. These variations in plant composition were due to the impact of controlling the intensity and timing of grazing on the competition between palatable and perennial species with invasive and annual ones.
Hosein Tavakoli; Amr ali Shahmoradi; Ali asghar Paryab; Abass ali Farhanghi
Volume 13, Issue 1 , February 2006, , Pages 39-47
Abstract
A vast area of Iran is covered by sand dunes and shifting sands in wich threat the living of habitants in these regions. Biological control is an approprate method for sand dune fixation. So, it is essential to regonize characteristics of psamophyte plant species and introducing suitable speciecs ...
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A vast area of Iran is covered by sand dunes and shifting sands in wich threat the living of habitants in these regions. Biological control is an approprate method for sand dune fixation. So, it is essential to regonize characteristics of psamophyte plant species and introducing suitable speciecs for sand dunes. For this perpose, the ecological characteristics of Ammodendron persicum including phenology, adaptability, soil condition of habitates, response to cutting and grazing, regeneration strategy and seed germination were studied . Ammodendron persicum is a shrub and psamophyte plant with the age of 10 to 50 years. Phenoligically, the growth started in March, flower in about 7 May and reach to seed maturity by 20 June. The seed shaded after maturity but the duration of plant growth depend to amonnt of annual rainfall. Ammodendron is a drought resistant plant, because it is grow well in an area with an average of 150 mm rainfall per year. Ammodendron regenerates by seed and vegetative propagules. Grazer animals use this plant by end of growing season. In general this plant has approparate ecological characteristies in terms of establishment over sand dune and has perspective for using in other sand dune areas. The later case is under investigation.
Morteza Akbarzadeh; Taghgi Mirhaji
Volume 13, Issue 3 , February 2006, , Pages 222-235
Abstract
Study of vegetation changes of ungrazed rangelands is important. It is supposed that ungrazed areas tends toward climax and range condition to be improved. The major portion of our rangelands are laied in arid and semi-arid regions. For that precipitation is the major influential factor on vegetation ...
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Study of vegetation changes of ungrazed rangelands is important. It is supposed that ungrazed areas tends toward climax and range condition to be improved. The major portion of our rangelands are laied in arid and semi-arid regions. For that precipitation is the major influential factor on vegetation changes. In dry years as rainfall decreases, the vegetation cover are damage. This study were conducted on Rudshur rangelands for nine years (1996-2004), with the aim of rainfall variation and ungrazed condition effects on vegetation changes. Plant parameters as canopy cover, density and seedling numbers were estimated on permanent plots each year. A dry period were started in 1997 in the region and continued for five years. Results showed, in a period of nine years, total canopy cover declined 40 percent. Decline of canopy cover varied from 26 to 95 percent for different species. Only canopy cover of the Poa sinaica increased about three times, due to earliest vegetative period in growing season. Decline in canopy cover was greatest in forbs, and grasses had lower decline. Regeneration was high in the rainy years and 81 percent of total seedlings belonged to grasses especially to Stipa hohenackeriana. Density of most species decreased in the study period especially in dry years.