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Articles by M. Heydari
Total Records ( 3 ) for M. Heydari
  M. Heydari and A. Mahdavi
  The aim was to study biodiversity of plant species including trees, shrubs and grasses in related to physiographic factors (aspect, elevation above sea level and slope percentage) in Melah Gavan protected area from northwestern Ilam province, Iran. The field data were collected using a number of 67 field plots in a systematic randomized design (each covering 20x20 m). The characters including tree and shrub species type, number and canopy coverage were recorded by measuring their small/large diameters in each plot. In order to record the herbaceous species, the Whitaker′s snail plot method was applied and the minimum plot area 81 m2 was determined. Based on the results, there are two tree species, one Shrub and 74 Grasses (belonging to 71 genus and 29 families) in the study area. The family Poaceae and the genus Euphorbia sp. form the most existing plants as well as Therophytes cover (51%) the most vegetative form in the area. The results obtained from multivariate Duncan test showed that the biodiversity is maximum in southern aspect and minimum in eastern aspect. Moreover, plant richness was the most in southern aspect while it was not significantly different in the other aspects. Investigation of biodiversity and richness amongst the altitude classes showed that the low altitudes (1400-1500 and 1500-1600 m ranges) have the most, while the upper altitudes (1800-1900 and 1900-2000 m ranges) have the least diversity. The ANOVA results also showed that the slope percentage had a significant effect on biodiversity and richness of plants. The results obtained from multivariate Duncan test showed that the biodiversity and richness are maximum in 0 - 25 slope percentage.
  M. Heydari and Ali Mahdavi
  The aim of this study was to investigate the biodiversity and richness of vegetation between ecological species group. In this research, vegetation (tree, shrub, bush and herbaceous species), Persian Oak (Quercus brantii) natural regeneration, some physical and chemical properties of soil and physiographic factors were taken in 50 sample plots. The plots area was 20x20 m. The sample plots were located using transect`s method. The coverage percent of trees and shrubs in each plot were measured regarding to large and small canopy diameter. For herbaceous layer, Withaker, hasted plot sampling was used and 64 m2 were defined as minimal area. Overall, 4 trees, 3 shrubs, 1 bush and 78 herbaceous species, which belong to 73 genera and 32 families, were recognized. Multivariate analysis methods were used to classify and determine the relationship between species composition and environmental factors and also to recognize ecological species group. The results indicated that five ecological species groups were recognized in the study area and the parameters such as: elevation, organic matter, N, P, K, bulk density, SP, pH, clay and C/N were important factors. The results indicated that biodiversity and richness were maximum in the third group. This site was more humid than the others and organic materials such as, N, P and K are higher than the other sites. In the fifth group that bulk density was high and organic matters were low and its soil was compacted, biodiversity and richness were lower than the other groups.
  S.M.H. Mirhoseini , M. Heydari , A. Shoulaie and A.R. Seidavi
  In order to test the effect of radio frequencies in rice and wheat flour pest control, the samples were dirtied by Tribolium confusum flour pest and Sitophilus oryzae rice pest. The wheat flour pests were radiated at 13.56 MHz in 10, 20, 30, 40, 45 and 60 sec, at 27.12 MHz in 5, 10, 20, 25, 30, 35 and 60 sec and at 40.68 MHz in 5, 10, 20, 12, 15 and 60 sec. The rice samples were heated at 13.56 and 27.12 MHz in 60, 75, 85, 95 and 105 sec. After above mentioned times, the number of died insects were counted. Quality test of treated flour and rice samples were done after treatments. Based on the results, the mortality of wheat flour pests after 45 sec at 13.56 MHz reaching 45°C, after 35 sec at 27.12 MHz reaching 46°C and after 15 sec at 40.68 MHz reaching 47°C was 100%. Temperature sensitivity of Tribolium confusum at 13.56, 27.12 and 40.68 MHz frequencies were 40, 38 and 43°C, consequently. Also, the results demonstrated that the mortality of rice pests after 105 sec at 13.56 MHz, reaching 57°C and after 95 seconds at 27.12 MHz, reaching 58°C was 100%. Temperature sensitivity of Sitophilus oryzae at 13.56 and 27.12 MHz frequencies were 48 and 50°C, in order. The combination of the results showed that pest control potency and intensity increases as frequency rises.
 
 
 
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