Sajad Amiri; Ghasem Khodahami
Volume 28, Issue 2 , June 2021, , Pages 296-307
Abstract
Three perennial grasses Stipa arabica, Elymus pertenuis, Hordeum bulbosum, were selected under rainfed conditions in semi-steppe habitats of Fars province. Seeds of 15 populations of these three species (five species of each genus) were collected in 12 habitats and an elevation profile of 1700 to 2600 ...
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Three perennial grasses Stipa arabica, Elymus pertenuis, Hordeum bulbosum, were selected under rainfed conditions in semi-steppe habitats of Fars province. Seeds of 15 populations of these three species (five species of each genus) were collected in 12 habitats and an elevation profile of 1700 to 2600 meters above sea level located in seven cities. Each population included 120 pots (1800 pots in total) at the preparation station, and seeds (three seeds per pot) were planted in pots. In the third year, after preparing the main land, seeds were sown in three rows in each plot based on a completely randomized block design. Necessary assessments were made after species emergence based on canopy cover, plant height, forage production, seed production, and longevity. The results showed that Hordeum bulbosum with 471.67 kg seed production and 539.20 kg forage production per hectare had the highest yield, and Stipa arabica species with 1642 cm2 and 92.60% had the highest canopy cover and vigor, respectively.
Eshagh Omidvar; Hossein Arzani; Saeed Mohtashamnia; Seyed Akbar Javadi; Mohammad Jafary
Volume 28, Issue 1 , April 2021, , Pages 1-10
Abstract
Regardless of rangeland plant production, it is not possible to plan and manage livestock and rangeland. Attention to rangeland forage production is essential for efficient and effective rangeland management. This importance is determined by identifying the relationship between forage ...
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Regardless of rangeland plant production, it is not possible to plan and manage livestock and rangeland. Attention to rangeland forage production is essential for efficient and effective rangeland management. This importance is determined by identifying the relationship between forage production of plants and climatic variables which affect them in the field. For this purpose, the annual forage production values of rangeland index species were measured in Omidabad Eastern site during the years of 1998-2008 for 10 years in the national plan for rangeland assessment of different climatic zones and their re-measurement during the years of 2017-2018 for two years by cutting and weighing in 60 random plots of two square meters along four 300-meter tracts. The amount of rainfall and monthly temperature in this time interval were also calculated using the data of Abadeh meteorological station in all months separately each year. The amount of annual dry forage production of each species as a dependent variable and the amount of rainfall and temperature calculated as independent variables and relationships between them were investigated using a linear multivariate regression program in SPSS software. The results showed that rainfall, winter, and fall temperatures had a significant effect on species production and spring rains as well as the temperature of the growing season, in April and May, alone did not affect the forage production of the species and based on the results research, with the availability of rainfall and temperature data, the annual forage production of the studied species and the annual production of the coming years can be estimated with high accuracy.
Sajad Amiri; qasem khodahami
Volume 27, Issue 3 , October 2020, , Pages 504-515
Abstract
Three perennial grass species, Stipaarabica, Elymus pertenuis, and Hordeum bulbosum, were selected in the semi-steppe habitats of Fars province, and seeds of 15 populations of these three species (5 species of each genus) in were collected 12 habitats. For each population, 120 pots (a total of 1800 pots) ...
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Three perennial grass species, Stipaarabica, Elymus pertenuis, and Hordeum bulbosum, were selected in the semi-steppe habitats of Fars province, and seeds of 15 populations of these three species (5 species of each genus) in were collected 12 habitats. For each population, 120 pots (a total of 1800 pots) were prepared and the seeds (three seeds per pot) were planted. In the third year, after preparing the main land, seeds were planted in three rows in each plot based on a completely randomized block design. Necessary evaluations after emergence of the species were performed based on the cover canopy area, plant height, forage production, seed production, and vigor. The results showed that Hordeum bulbosum with seed production of 471.67 kg and forage production of 539.20 kg/ha had the highest production, and Stipa arabica had the highest canopy cover (1642 cm2) and vigor (92.60%). Elymus pertenius had the highest forage production (460.93 kg/ha) and canopy cover (1447 cm2).
Motahareh Esfandiari; Mohammad ali Hakimzadeh Ardakani
Volume 17, Issue 4 , November 2011, , Pages 624-631
Abstract
Desertification is one of the most important problems in arid and semiarid lands of the world. Rapid growth of human population and increasing of cultivation cause the degradation of soil and water resources. In the other hand, the reclamation of soil is time consuming and very expensive; therefore, ...
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Desertification is one of the most important problems in arid and semiarid lands of the world. Rapid growth of human population and increasing of cultivation cause the degradation of soil and water resources. In the other hand, the reclamation of soil is time consuming and very expensive; therefore, it is necessary to know the destruction factors of soil and its effects on desertification. In order to evaluate soil degradation in agricultural lands of Abade-Tashk, the IMDPA model was used. Four soil indexes: Electrical Conductivity, percent of gravel, depth and texture were applied in this model. For evaluation of soil indexes, randomized network sampling was used and then each index measured according to its effect in the model. The geometrical mean of indexes were calculated using GIS software. Desertification map of each index was prepared and then the current situation of each index obtained. The final map of desertification was prepared by combination of the index maps using mean geometrical method. The results showed that 47% of total area (2212 ha) located in low class of desertification, 43% (2019 ha) in medium class and 10% (467 ha) in high class of desertification.