Esmaeil Sheidai Karkaj; Esfandiar Jahantab; Zahra Mahmoodi
Abstract
Plant growth and yield in the environment is affected by numerous biotic and abiotic environmental stresses as well as seed dormancy. The aim of the present study was to investigate the effect of seed washing treatments with sulfuric acid and irrigation of seeds with saline water on seed germination ...
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Plant growth and yield in the environment is affected by numerous biotic and abiotic environmental stresses as well as seed dormancy. The aim of the present study was to investigate the effect of seed washing treatments with sulfuric acid and irrigation of seeds with saline water on seed germination of Zygophyllum fabago. According to previous relevant researches, for this purpose, three concentrations of 0, 10 and 20% were prepared for acid washing treatment. For salinity treatment, four levels were considered: 0, 60, 90 and 120 mmol / l. Irrigation with spray water was applied evenly on all pteridia when necessary. Germinated seeds were counted daily and continued until no increase in the number of germinated seeds was observed .Comparison of the mean of the main effect of different levels of acid treatment on the germination percentage of Z. fabago showed that zero and ten percent acid concentration treatments with 59 and 60 percent have a higher value. Regarding the comparison of the mean of the interaction effects of acid and salinity, the results showed that the best treatment combination is zero percent acid and zero salinity of ten and ten millimoles per liter. Therefore, Z. fabago species needs low concentrations of salinity and sulfuric acid for optimal growth. Therefore, it can be used to improve and rehabilitate rangeland ecosystems according to the salinity of the area.
Javad Motamedi; Shookofeh Ebrahimi; Esmaeil Sheidai Karkaj
Abstract
Estimation of carbon storage is one of the essential requirements for evaluating rangeland ecosystem services and economic evaluation of carbon storage in rangeland plans. Plant performance in carbon storage is a function of plant characteristics, environmental and management factors. Therefore, the ...
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Estimation of carbon storage is one of the essential requirements for evaluating rangeland ecosystem services and economic evaluation of carbon storage in rangeland plans. Plant performance in carbon storage is a function of plant characteristics, environmental and management factors. Therefore, the relationship of annual carbon storage of Astragalus brachyanus with plant traits, habitat characteristics and range management in the mountainous rangelands of Rajan was investigated. The five sites in which the species were distributed and differed in physical characteristics were selected and coded based on the type of management (exclosure or exclosure; intensity of grazing, medium and low grazing) and geographical direction. At each site, vegetation was measured within 30 two-by-two-square-meter plots, located 10 m apart along six 50 m transects. At each location, 15 A. brachyanus plant stands with different dimensions were selected and measured while measuring their appearance characteristics, and their current year growth was cut to estimate carbon storage. Samples were transferred to the laboratory to estimate the carbon conversion factor. Two composite soil samples were also taken from each site. Topographic factors (slope, geographical direction and altitude) and management (grazing in study units) were also recorded at each location. In order to investigate the relationship between annual carbon biomass storage and environmental and management , partial least squares regression was used. Based on the results, carbon storage of A. brachyanus was significantly different. Annual carbon biomass carbon storage, with crown diameter, number of base and plant height, was directly correlated with type of management (grazing intensity).
Ali Norouzi; iman haghiyan; Esmaeil Sheidai Karkaj
Abstract
Rangelands as a source of meat, forage, water and soil play a significant role in the country's economy, but the increase in the number of livestock and livestock in the rangelands has eliminated the balance between production and harvest. In this research, the effect of rangeland projects on various ...
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Rangelands as a source of meat, forage, water and soil play a significant role in the country's economy, but the increase in the number of livestock and livestock in the rangelands has eliminated the balance between production and harvest. In this research, the effect of rangeland projects on various indices such as plant diversity, condition, rangeland trend, production and canopy cover percentage in five rangeland (Tajrud, Sangolabad, Ali Abad, Garmab and Dochahi) located in Torbat Heydarieh county has been investigated. For this purpose, after measuring the mentioned indices in the rangelands (treatment) and their adjacent sites as a control, statistical analysis were performed using t-test. The results of the comparison of the mean vegetation percentage indicate that the canopy cover percentage of the planted area with the rate of 51/64% is higher than the ungraded area with a rate of 47.5% with a significant canopy at 5%. Also, despite the high number of production in the area with a plot (73.08 kg / ha), compared to the area without design (67/99), this difference is not significant. The average score of the score for the area inside the project (27.4) and outside the plan (23.4) are not statistically significant with each other. The implementation of rangelands in three regions from all five regions has been proven to negatively affect rangeland tendency. Also, the implementation of the rangeland scheme has significantly increased the Shannon-Wiener heterogeneity indices and Simpson's uniformity in the design, rangeland has not changed significantly in the Margalaf richness index.
Esmaeil Sheidai Karkaj; isa jafari; roghayeh jahdi
Abstract
Fires are one of the most important factors affecting natural ecosystems. This study was done in order to investigate the effects of fire on soil chemical properties, soil seed bank and vegetation cover in Yeke Bermagh, Highland ranegelands in the southern part of Golestan National Park. After determination ...
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Fires are one of the most important factors affecting natural ecosystems. This study was done in order to investigate the effects of fire on soil chemical properties, soil seed bank and vegetation cover in Yeke Bermagh, Highland ranegelands in the southern part of Golestan National Park. After determination of control and burned area, sampling was done with 5 transects and 5 plots. Vegetation cover, density and production were recorded in each site. One plot was chosen for analysis of soil chemical properties and soil seed bank along transects. Sampling for seed soil bank determination was accomplished in two depths, 0-5 cm and 5-10 cm. In order to distinguish the differences between the two depths in each site, the independent t-test, and pair t-test were used. Comparison of soil properties in the two control and burned areas showed that pH, potassium, nitrogen, phosphors, carbon, EC and CEC in the burned area was more than control area. According to the results the amount of richness and diversity of seed bank in the control area was higher than the burned area. Furthermore, richness and diversity in the first depth was more than the second depth, in both areas.
