Salahaddin Zahedi; Farhang Ghasriani; Mina Bayat
Volume 27, Issue 4 , December 2020, , Pages 712-721
Abstract
Nine accessions of Elymus libanoticus was planted at Baharestan Agricultural Research Station and evaluated in order to nominate of the best accessions in terms of adaptability and establishment. The experiment started in 2010 and continued to 2015. For each accession adequate seed of different stocks ...
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Nine accessions of Elymus libanoticus was planted at Baharestan Agricultural Research Station and evaluated in order to nominate of the best accessions in terms of adaptability and establishment. The experiment started in 2010 and continued to 2015. For each accession adequate seed of different stocks in whole of the province was reaped. In reproduction phase (2010 autumn) and after soil preparation, all accessions were planted on plots with 5*6 m2, with 50cm spacing of planting line and planting points and 3cm of planting depth. At this stage weeding, and three irrigation times were performed. In the summer of 2011 mature seeds of grown accessions harvested and re-cultivation of seeds that were not green in the first stage was carried out. In 2011 and 2012autumn, the accession of each species based on complete randomized block design with 3 replications and 2 meter intervals on 2*4 m2 plots and 4 lines with 4-meter length and 50 cm intervals (In order to elimination of marginal effects) and 3 cm of planting depth planted as rainfed. The measured traits for plant selection were 1) growing 2) flowering 3) seeding 4) Yield 5) canopy cover 6) height and 7) regrowing, all data were statistically compound analyzed by SPSS and averages were compared using Duncan method. Results showed that there were significant differences among the measured traits and accessions (P≤0.05) in all studied years (2012-2015). In terms of measured parameters for all accessions of Elymus libanoticus, Iranshah and Chakhelo accession, respectively showed superiority and minority in the Baharestan research station conditions. In addition to the difference in genotypic power and the amount of precipitation that mentioned in previous studies as the only limiting factors of growth and propagation, Variable factors such as altitude from sea level, depth of soil and geographic direction of collecting areas of different accessions are factors influencing the establishment and adaptation of rangeland species in the site of cultivation and have the most effect on the performance of different accessions. So, it seems that zoning of areas is necessary for seed reproduction in order to improve the rangelands, and the use of extras in each area is necessary for replanting and planting in the same area.
Salahudin Zahedi; yahya parvizi
Volume 27, Issue 2 , June 2020, , Pages 276-286
Abstract
Global warming due to increasing concentrations of greenhouse gases, especially carbon dioxide, has led to drastic climate change in recent decades. This has intensified the process of degradation of natural resources, soil and water, especially in arid and semi-arid regions. One of the most important ...
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Global warming due to increasing concentrations of greenhouse gases, especially carbon dioxide, has led to drastic climate change in recent decades. This has intensified the process of degradation of natural resources, soil and water, especially in arid and semi-arid regions. One of the most important tools for adapting or modifying the consequences of this crisis is the sequestration and storage of carbon by natural ecosystems with the help of efficient management tools such as rangeland and watershed management. This study was conducted to evaluate and quantify carbon storage in various types of biological remediation and rehabilitation operations, including pit-seeding and exclosure in the Gavdareh watershed of Kurdistan province. Sampling was performed in soil and plant units using a systematic random sampling method of aerial parts, roots, litter, and soil. Samples were analyzed in vitro. The results of the statistical analysis of the data indicated that the amount of vegetation carbon storage in the experimental treatments had a significant difference (p≤ 0.05). The least significant difference in this level of probability is 334.35 kg/ha (p≤ 0.05), and also the results of comparing the mean yield of these treatments showed that the amount of carbon storage in the exclosure was higher than other treatments, and compared to the experimental control in the upper and higher class. The average total carbon stored per unit area was 8809 kg/ha, 67% of which was related to carbon storage in the soil. In general, it is concluded that biological remediation operations, especially exclosure, have a high capacity for carbon storage, and the soil is the most important carbon reservoir in this operation.
Salahaddin Zahedi; Mina Bayat; Farhang Ghasriani
Volume 23, Issue 1 , June 2016, , Pages 80-91
Abstract
In the past decade, extensive changes have occurred in the land use and land cover of Qeshlaq dam watershed. The rangelands of the study area have undergone extensive changes, converted to other land uses, or lost their quality. The continuation of this process not only reduces the forage production ...
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In the past decade, extensive changes have occurred in the land use and land cover of Qeshlaq dam watershed. The rangelands of the study area have undergone extensive changes, converted to other land uses, or lost their quality. The continuation of this process not only reduces the forage production and consequently livestock production but also increases unemployment and migration to the city, leading to increasing soil erosion and sediment yield as well as reduced size of the dam reservoir and reduced economic life. This research was aimed to detect and provide the map for the land-cover changes in the study area during 1987 and 2010 using TM Landsat 5 satellite images. In this regard, the available data of the study area and the data collected from field were used as ancillary data. Maximum land-use changes, with a reduction of 4857 ha in area, were related to the class II rangelands, followed by class III rangelands with an increase of 2983 ha, and agricultural irrigated lands with an increase of 1641 ha, respectively. Our results clearly confirm the heavy grazing in the study area and conversion of rangelands to agricultural lands.
Salah addin zahedi; Farhang Ghasriani; Mina Bayat
Volume 22, Issue 3 , November 2015, , Pages 481-491