List of Articles Similarity index

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - Forest types studying using ecological indices (Case study: Maroon side of Behbahan)
  Elahe Hekmatzadeh Reza Basiri Shahram Yousefi Maleehe Mozayyan
  10.30495/jest.2023.76623.5956
  Background and Objective: Sustainable management of renewable natural resources has special importance and sensitivity in Iran. Identify elements of the forest including forest types, is the most consistent way to manage natural resources and especially forests. River f More

  Background and Objective: Sustainable management of renewable natural resources has special importance and sensitivity in Iran. Identify elements of the forest including forest types, is the most consistent way to manage natural resources and especially forests. River forests are important areas for preserving biodiversity and ensuring the sustainability of the forest ecosystem. On this principle, it is necessary to know and understand the state of the structure of these forests and the types of trees in them and to know the evolutionary process of forest ecosystems before any planning. The aim of this study is forests typing of Maroon riverbank. Material and Methodology: 116 plots were chosen with an area of 100 using a systematic random sampling method with dimensions of grid for the study area. In each plot, tree and shrub species, canopy cover in the area of plot were estimated and recorded according to Braun-Blanquet scale corrected. Various parameters such as frequency, abundance and density were calculated. Through the sum of the above three relative parameters, the IVI index was obtained for each species. In order to compare the degree of similarity between types, Sorenson's similarity index was used. Relative abundance values for each species in pure and mixed types were set on a 10-unit scale and divided into four specific groups. After determining the tree types of the area, their map was drawn through IDW interpolation method in GIS10.1 software. Findings: In pure type, Tamarix ramosissima and Populus euphratica, with the highest and lowest frequency (6.7 and 3.3) are indicated as high and low respectively. In general, three types were found including pure, mixed with two and three species. The most amount of Sorenson similarity index was determined between two types of Tamarix-Populus and Tamarix-Lycium (93%) and also Populus-Tamarix and Populus-Lycium (92%). The lowest similarity index value of 12% to 15% was observed between the Populus-Lysium-Tamarix type with pure Tamarix, Tamarix-Lysium, Tamarix-Populus and Populus-Tamarix types. Minimum and maximum maturity index was obtained for pure types (50%) and mixed types (79%), respectively. Pure types have low maturity and mixed types have high maturity. The maturity index for the entire region was 72%, which indicates high maturity. Discussion and Conclusion: The tree cover of the river forests of Maroon Behbahan were classified into pure and mixed types on a general scale. The number of two pure types of Tamarix and Populus and seven mixed types including four cases of two types and three cases of three types were obtained. Three species (Tamarix arceuthoides, Populus euphratica and Lycium Shawii) are generally important in the creation of regional types. Among the pure and mixed types, Tamarix was recognized as the most abundant species. The great similarity between pure Tamarix, Tamarix-Lycium and Tamarix-Populus types is due to the common and dominant presence of Tamarix in these types. A variety of different types in a limited area represents complex river ecosystems. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - Species diversity of Megachilidae (Hymenoptera: Apoidea) in Yazd province
  L. Dehghan Dehnavi A. A. Talebi Sh. Goldasteh R. Vafaie
  The family Megachilidae with more than 4000 wordwide described species is the thirth family of polliniting bees. In this research, in order to investigating the species diversity of Megachilidae, SDR software was used in different regions. The number of species in three More

  The family Megachilidae with more than 4000 wordwide described species is the thirth family of polliniting bees. In this research, in order to investigating the species diversity of Megachilidae, SDR software was used in different regions. The number of species in three counties Yazd, Mehriz and Taft, abundance percentage of each species than total species that collected is determined. The indices of  abundance, diversity, evenness, richness species and also habitat similarity index for 48 species that collected in the three counties was calculated during 2012 and 2013. Megachile rubripes with relative abundance 48% in Yazd county in 2012, Anthidium florentinumwith relative abundance 22.5% in 2013, Megachile pilicrus with relative abundance 26.3% in Mehriz county in 2012, A. florentinum with abundance 19.3% in 2013, Lithurgus chrysurus with relative abundance 23.8%% in Taft county in 2012, Osmia  caerulescens  with relative abundance 29% in 2013 have the most abundance between species. According to alfa species diversity indices, determined that Mehriz and Taft counties have hiegher species diversity in 2013. According to satatistic comparation of evenness indices of species of Yazd, Mehriz counties and also Taft county has similarity evenness in 2012, 2013, but species abundance evenness was more in Mehriz and Taft counties than Yazd county. Species evenness was similar in Mehriz and Taft counties in 2012, 2013. Rarefaction method showed that Taft county has hiegher richness species in 2012. β diversity index showed that Mehriz and Taft counties have the most similarity in 2012, 2013. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  3 - Herbicide on Weed Composition, Diversity and Density in Silage Corn (cv. Sc 704)
  M. Zafarian R. Sadrabadi Haghigi L. Alimoradi
  In order to study the effect of plant density, planting pattern and herbicide dosage of nicosulfuron, a field experiment was arranged in a factorial split plot treatments based on RCBD with three replications in Chenaran, Khorasan Razavi, in 2010. The experimental treat More

  In order to study the effect of plant density, planting pattern and herbicide dosage of nicosulfuron, a field experiment was arranged in a factorial split plot treatments based on RCBD with three replications in Chenaran, Khorasan Razavi, in 2010. The experimental treatments consisted of a factorial plant density (100000, 120000 and 140000 plants ha-1) in the planting pattern (single and double row) as main plot and herbicide dosage of nicousulforon in four levels (0, 1, 1/5 and 2, l.ha-1) as sub-plot. Samplings were made at in five stages (37days after the emergence of corn and it was repeated once per 20 days). The results indicated reducing the weed density and dry matter of weeds in the first stage after the herbicide treatment. Moreover, it was observed a significant interaction effect between plant density with planting pattern and between planting pattern with herbicides dosages during growth season on reducing weed density and dry matter. Also results indicated that in between of this experiment's treatments, nicosulfuron herbicide reduced weed density at the beginning of growth season and double row planting pattern suppressed weed density during growing season, and resulted in lowest Jacard similarity index (Sj) of weed species. Results also indicated that with increasing of plant density and herbicide dosage especially in composition of double row planting pattern, according to Shannon- Wiener index, sensitive population such as common purslane (Portulaca oleracea L.), buckhorn plantain (Plantago lanceolata L.), prostrate knotweed (Polygonum aviculareL.), black nightshade (Solanum nigrum L.) and Johnson grass (Sorghum halepens L.) was reduced in during growing season. Simpson dominance index, showed that some low populated weeds such as redroot pigweed (Amaranthus retroflexus L.), common lambsquarters (Chenopodium album L.), field bindweed (Convolvulus arvensis L.) and Canada thistle (Circum arvensis L.) persisted their growth up to the end of growing season. Manuscript profile