Jaber Sharifi; Morteza Akbarzadeh
Volume 26, Issue 1 , June 2019, , Pages 40-48
Abstract
Knowing the ecological characteristics of plants and consequently changes in forage production during the season of grazing for grazing management is essential. Therefore, understanding the annual and monthly production of different rangeland types is essential for efficient ...
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Knowing the ecological characteristics of plants and consequently changes in forage production during the season of grazing for grazing management is essential. Therefore, understanding the annual and monthly production of different rangeland types is essential for efficient and effective forage management. Consequently, relationships between forage production and climatic variables should be considered. For this purpose, the annual forage production was measured in the research exclosure of Arshaq Site rangelands in Ardabil province during 2007-2010 by clipping and weighing method. The monthly rainfall in this period was calculated using Mashkin-Shahr synoptic station data and then the amount of cumulative rainfall in winter and spring of each year was calculated. Afterward, the relationship between production and winter and spring rainfall as well as rainfall of different months of winter and spring was studied separately. Statistical analysis was performed using SAS software. According to the results, the average forage production during four years was calculated of which 28.95% belonged to Artemisia fragrans, 26.35% to Kochia prostrate, 19.55% to Stipa hohenackeriana, 4.77% to Astragalus brachyodonuts and 20.38% to the other species. Analysis of variance showed that the production of species among years were significant (P<0.01). In terms of stability (interactions of year × month), Artemisia fragrans and Kochia prostrata were stable, with a high yield; however, Astragalus brachyodonuts and Stipa hohenackeriana were stable with a low yield.
Jaber Sharifi; Farhang Ghasriani; Younes Rostamikia
Volume 25, Issue 4 , February 2019, , Pages 829-838
Abstract
Festuca sulcata L. as a perennial grass is special to semi- steppe rangelands in alpine regions. In order to evaluate the growth quality, forage and seed yields, five extensions of this species were planted under rainfed conditions in a completely randomized block design ...
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Festuca sulcata L. as a perennial grass is special to semi- steppe rangelands in alpine regions. In order to evaluate the growth quality, forage and seed yields, five extensions of this species were planted under rainfed conditions in a completely randomized block design with three replications at Samian station in Ardebil. After establishment of the seedlings, traits, such as viability percentage, crown cover, shrub height, seedling vigor, and forage and seed yields were measured from 2010 to 2014, at the end of the growing season. The data were analyzed using SAS software and comparison of the means of the evaluated traits was performed by Duncan's multiple range tests at P ≤ 0.05. The results showed that the greatest percentages of crown cover (997.77 cm2), shrub height (45.88 cm) and seed viability (100%) were belonged to Sarein-Alvaris accession. Average values of forage and seed yields were 528.58 and 93.33 kg ha-1 y-1, respectively. There was no significant difference between accessions in term of seed yield but there was a significant difference (P ≤ 0.01) between years. The average seed production in the studied ecotypes was 95.33 kg ha-1. Consequently, superior accessions of this species with great potential for foliage production can be used in the process of restoration and development of semi- steppe rangelands in alpine region.
Jaber Sharifi; Amrali Shahmoradi; Allahvirdi Noori; Farzaneh Azimi Motam
Volume 24, Issue 4 , January 2018, , Pages 719-729
Abstract
The major portion of our rangelands are located in arid and semi-arid regions. In this climate, variability of vegetation under climate change impact of balanced energy flow in ecosystems ranges vegetation is that the generally composition and structure of vegetation typically occurs over time. on the ...
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The major portion of our rangelands are located in arid and semi-arid regions. In this climate, variability of vegetation under climate change impact of balanced energy flow in ecosystems ranges vegetation is that the generally composition and structure of vegetation typically occurs over time. on the other hand, human factors and grassland management, especially crucial in maintaining its stability or degradation plays. Accordinglymonitoring vegetation winter pasture areas was conducted in Ardabil Province from 1387 to 1391. In each community a key area was determined to establish a permanent site, In each key area of the canopy cover, density and abundance during the three transects 500 m in 30 plots (1/20 × 1/20 meter) as well as soil moisture and organic carbon were measured. The results showed that a four-year period, proportional to changes in rainfall and temperature, Under local management conditions, In Moqan sites of Artemisia fragrans with absolute dominance and renewed growth. In direct response to the seasonal and annual rainfall and vegetation cover has a decisive role the results of the survey year to year changes in vegetation,climate changes from year to year and soil moisture also how the soil erosion condition can as an appropriate guide to the correct current methods used for management of rangeland ecosystems.
vahid Izadi Khajeloo; younes asri; jaber sharifi nayaragh
Volume 22, Issue 4 , March 2015, , Pages 721-729
Abstract
Capparis spinosa is an important plant species in the rangelands ofDashte Moghan. In the current study, the ecological characteristics of the mentioned species were investigated at three representing sites. At each site, 30 plots of 10 m2 were established along transects and systematic random sampling ...
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Capparis spinosa is an important plant species in the rangelands ofDashte Moghan. In the current study, the ecological characteristics of the mentioned species were investigated at three representing sites. At each site, 30 plots of 10 m2 were established along transects and systematic random sampling was applied. Within the plots, density, coverage, height, length of longest stem, biomass, leaf length and width, and regeneration were measured. A number of 3-5 plants were randomly selected at each site and the root length was measured. Three soil samples were also taken from the root mass depth and a few soil physico-chemical properties were measured. The data were analyzed by ANOVA in Minitab software ver.14. Results showed significant differences among the study sites for coverage and biomass at p<0.05 and density and regeneration at p<0.01. However, no significant differences were recorded for height, length of longest stem, and leaf length and width. According to the results of PCA, soil texture, rainfall, and altitude were the most important factors affecting the density, distribution, and abundance of the species studied. Capparis spinosa L. prefers deep to semi-deep soils with an EC of 2.3 ds/m and a pH of 7.9 for growth and establishment.
Jaber Sharifi
Volume 9, Issue 2 , September 2001, , Pages 537-548