Reza Chamanpira; Reza Siahmansour; Hossein Arzani
Volume 27, Issue 2 , June 2020, , Pages 204-214
Abstract
One of the main goals of rangeland assessment is to obtain the amount of forage production of rangeland species because it plays an essential role in determining rangeland capacity and grazing management. Measuring the amount of production requires a lot of time and costs, so finding cheap, fast and ...
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One of the main goals of rangeland assessment is to obtain the amount of forage production of rangeland species because it plays an essential role in determining rangeland capacity and grazing management. Measuring the amount of production requires a lot of time and costs, so finding cheap, fast and scientific methods to estimate the amount of production can be a great help in assessing vegetation and rangeland management. The purpose of this study was to find a suitable relationship between the percentage of canopy cover of species and plant classes with their production amount. For this purpose, the percentage of canopy cover of the species was examined during a six-year statistical period within 60 plots (1m2) located along six transects (200 m). In addition, each year, the amount of species production in a quarter of the plots (25% of them) that were caged to prevent possible grazing, was measured by clipping. To determine the amount of total forage production, the regression relationship between canopy cover and species production was used and based on the significance of the equation (p≤ 0.05) and coefficient of determination (R²), the best equation was fitted. The results showed that there was a significant correlation (p≤ 0.01) between production as a dependent variable and the percentage of canopy cover of the species as an independent variable. The coefficient of determination for each of the classes I, II and III were 0.77, 0.87 and 0.92, respectively, which provide the most appropriate linear production-canopy relationship for rangeland management.
Naser Ansari; Mehdi Zohdi
Volume 11, Issue 3 , August 2019, , Pages 309-322
Reza Siahmansour; Mohammad fayaz
Volume 25, Issue 4 , February 2019, , Pages 853-862
Abstract
Unfortunately, due to the improper use of natural resources, tremendous changes on the Earth happened which are harmful to human beings. The multidimensional nature of sustainable development has caused to pay more attention to the use of compatible, resistant, productive, high quality and palatable ...
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Unfortunately, due to the improper use of natural resources, tremendous changes on the Earth happened which are harmful to human beings. The multidimensional nature of sustainable development has caused to pay more attention to the use of compatible, resistant, productive, high quality and palatable species. One of these species is Astragalus curvirostris as a permanent species, which one of its habitats is in Beluman rangelands with an average height of 1960 meters above sea level and an average annual rainfall of 593.3 mm. In two times and two methods of planting, split plots were arranged in a randomized complete block design with three replications during four years (from 2013 to 2016). The main plot included two treatments of planting season consisted of autumn and spring, and the subplots included two methods of seed cultivation and seeding. Analysis of variance was used to compare significant differences between treatments, and distribution of mean treatments was analyzed by Duncan test. The results showed that there was a significant difference between the average number of available plant stands in different treatments including autumn seed sowing, autumn seed spreading, spring seed sowing and spring seed spreading at 1% level (P≤0.01). It means that its cultivation type and season have different performance on plant coverage. In addition, there was a significant difference between the plots at 1% level, which in fact can depend on the implementation of the treatments in each plot. Finally, it was found that Astragalus curvirostris achieved the best level of success in autumn and the seed sowing method.