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Articles by Hamid Jalilvand
Total Records ( 9 ) for Hamid Jalilvand
  Aidin Parsakhoo , Seyed Ataollah Hosseini , Majid Lotfalian and Hamid jalilvand
  Problem statement: In this study to evaluate the effects of hillside gradient on forest road cross section components in a loamy clay soil the amount of cut and fill slopes gradient and length, road bed and earthwork width were taken on tangent sections in a lat talar forest roads of Iran. Approach: The objective of this study were: (i) to evaluate the direct effects of hillside gradient on cross section components such as cut and fill slopes, road bed and earthwork width in a loamy clay soil, (ii) to use the model to predict the effect of hillside gradient on cross section components. Results: Results indicated that the regression analysis between hillside gradient and cut slope length had a significant linear relationship (p<0.0001), with equation of Y = 0.046+0.054 X (R2 = 0.60). The equation for the calculation of earthwork width (Y) from hillside gradient was Y = 4.928+0.132 X (R2 = 0.44). A significant linear relationship (p<0.0001), with equation of Y = 0.144x- 2.638 (R2 = 0.64) was found between hillside gradient and fill slope length values. Conclusion: Through analysis of variance it was also found that the hillside gradient had a significant influence (p<0.0001) on the cross section components.
  Aidin Parsakhoo , Hamid Jalilvand and Mehdi Sheikhi
  Problem statement: In this study, we considered transport corridors and sampling aspects to be the major indicators of ecological effects on Alder (Alnus subcordata) cambium cells dynamics. Approach: Thus, 240 cores were taken from forest-facing and road-facing trunk of Alder trees along Amre, Neka and Darab Kola transport corridors in hyrcanian Forests of Iran. Results showed that the roads corridor had significant effects on Alnus subcordata annual rings (p = 0.04) and bark growth (p<0.0001). Results: In Darab Kola and Neka the bark thickness in road-facing aspect was significantly (p<0.05) more than forest-facing aspect because of consistency reaction to natural hazards. Annual rings width in adjacent stand was significantly (p<0.05) more than the rings width at both sides of trees trunk along transport corridors. Conclusion: Cambium cells dynamic diagram in production of annual rings indicated that the Alnus subcordata at commence of growth had been produced wide rings but in continuance the rings width reduced. This reduction was obviously for road-facing cores. Soil compaction, drainage structures, natural hazards and etc caused the thinner rings to be produced by cambium cells in road-facing aspect.
  Ardalan Ahmadi , Asghar Fallah , Hamid Jalilvand and Yahya Kooch
  In order to determine the best form factor formula for Zarbin (Cupressus sempervirence var. horzontalis) in Kordkoy region (Golestan province-North of Iran), a number 54 trees were selected based on their distribution in diameter classes, from 8 to 28 cm (in a 2 cm diameter interval). First, several quantitative factors including diameter at breast height, diameter at 0.65 m of height and diameter at stump were measured using diameter tape, just before the trees being felled. After cutting the trees, the heights and diameter from breast height up to the height where diameter is 5 cm was measured using a diameter tape in a two meter interval. Finally, diameter at 0.1, 0.3, 0.5, 0.7 and 0.9 m of the total height was measured, respectively. As a consequent, each trees volume was precisely calculated as the real volume. Next, the real form factor (fr) was calculated and its average was statistically compared to the averages of natural (f0.1), artificial (f0.5) and hohenadel, s (fh) form factors using pair sample t-test. Results showed that there is no significant difference between the averages of Real and Natural from factors (at = 0.05 level). Hence, just Natural form factor is capable to replace the real form factor of Zarbin over the study area.
  Yahya Kooch and Hamid Jalilvand
  Earthworms are considered as soil engineers because of their effects on soil properties and their influence on the availability of resources for other organisms, including microorganisms and plants. However, the links between their impacts on the soil environment and the resulting modification of natural selection pressures on engineer as well as on other organisms have received little attention. Earthworms are known to have a positive influence on the soil fabric and on the decomposition and mineralization of litter by breaking down organic matter and producing large amounts of fasces, thereby mixing litter with the mineral soil. Therefore, they play an important part in changes from one humus from to another according to forest succession patterns. Consequently, they are also expected to be good bio-indicators for forest site quality and are thus useful when planning forest production improvement. Earthworm`s populations are as indicator that in exploited regions is destruction indicator and reclamation plans is nature return indicator. In this study we summarized the current knowledge in relation to earthworm`s ecology in forest soils as ecosystem engineers.
  Yahya Kooch , Hamid Jalilvand , Mohammad Ali Bahmanyar and Mohammad Reza Pormajidian

This research was conducted in Khanikan forests located in lowland of Mazandaran province (North of Iran). Eighteen profiles were dug and several chemical, physical and biological soil properties were investigated. The soil properties evaluated were soil pH, bulk density, saturation moisture content, electrical conductivity, organic carbon, total nitrogen, cation exchangeable capacity, available phosphorous, soil texture, calcium carbonate content, number and biomass of earthworms, litter carbon and litter nitrogen. Principal Component Analysis (PCA) was used to identify the variation of soil properties. PCA, a technique which reduces the dimensionality of multivariate data by removing Interco relations among variables, has a number of useful applications in forest researches. The results showed significant relationships between some soil factors with PC1 and PC2 axes, also, among different soil factors, the distribution of forest types was most strongly controlled with some soil characteristics such as acidity, bulk density, texture, phosphorous, organic carbon, total nitrogen and cation exchangeable capacity.

  Yahya Kooch , Hamid Jalilvand , Mohammad Ali Bahmanyar and Mohammad Reza Pormajidian
  A TWINSPAN classification of 60 sample plots from the Khanikan forest (North of Iran) is presented. Plant types were determined from field observations and sample plot data arranged and analyzed in association tables. The types were defined on the basis of species patterns of presence, absence and coverage values. Vegetation was sampled with randomized-systematic method. Vegetation data including density and cover percentage were estimated quantitatively within each quadrate and using the two-way indicator species analysis. The objectives of the study were to plant type`s classification for Khanikan lowland forest in North of Iran, Identification of indicator species in plant types and increase our understanding in regarding to one of Multivariate analysis methods (TWINSPAN). Five plant types were produced for the study area by TWINSPAN, i.e., Menta aquatica, Oplismenus undulatifolius, Carex grioletia, Viola odarata and Rubus caesius. Therefore, at each step of the process, the program identifies indicator species that show strongly differential distributions between groups and so can severe to distinguish the groups. The final result, incorporating elements of classification can provide a compact and powerful summary of pattern in the data set.
  Aidin Parsakho , Seyed Ataollah Hosseini , Hamid Jalilvand and Majid Lotfalian
  Effects of moisture, porosity and soil bulk density properties, grubbing time and terrain side slopes on pc 220 komatsu hydraulic excavator productivity were investigated in Miana forests road construction project which located in the northern forest of Iran. Soil moisture and porosity determined by samples were taken from undisturbed soil. The elements of daily works were measured with a digital stop watch and video camera in 14 observations (days). The road length and cross section profiles after each 20 m were selected to estimate earthworks volume. Results showed that the mean production rates for the pc 220 komatsu excavators were 60.13 m3 h-1 and earthwork 14.76 m h-1 when the mean depth of excavation or cutting was 4.27 m3 m-1, respectively. There was no significant effects (p = 0.5288) from the slope classes` treatments on productivity, whereas grubbing time, soil moisture, bulk density and porosity had significantly affected on excavator earthworks volume (p < 0.0001). Clear difference was showed between the earthwork length by slope classes (p = 0.0060). Grubbing time (p = 0.2180), soil moisture (p = 0.1622), bulk density (p = 0.2490) and porosity (p = 0.2159) had no significant effect on the excavator earthworks length.
  Seyed Ataollah Hosseini and Hamid Jalilvand
  Forest road is one of the most important ways to access the forest and its own activities. It should have some standard qualities and also had the list harm for nature. One of the most important qualities of forest road is limited of two sides to developing of natural forest. Alder tree is the first kind of trees that grows in northern forest of Iran closed to the constructed roads. This research was done in Mazandaran forest (Darab Kola district) to evaluate how Alder grows in the two side margins of roads. Twenty half plot (upper and lower road margins) with a size of 1000 m2 in one kilometer length of this road was selected and twenty face to face Alder trees closed to the road were sampled to take two cores in a face and back of road at the DBH level. After analyzing the data with a simple variance and comparing annual rings (curves), diameter, height and growth by simple and joint t-test, the results show that there is no significant difference between growing in upwards and downwards of road and also between diameter and height of tree in two sides of road. Most diameter distribution classes of trees were in a 15-20 cm. To consider more about this matter, study of different width and slopes of forest roads in a various forest stands was proposed.
  Hamid Ahani , Hamid Jalilvand and Jamil Vaezi
  This study was for the first time conducted in a greenhouse in order to pioneer forest trees (Elaeagnus rhamnoides) and to determine the effects of different treatments on seed germination in Iran. This species has drought tolerance for plantation. For this purpose, seeds originating in Qazvin were placed in the greenhouse. Treatments included three factors including seed pretreatments (control, cold, ice water, hot water, lime juice and Gibberellin acid), soils (control, Stockosorb, sand and compost) and irrigation (control and supplement water). These treatments were accomplished in CRD experimental designs with five replicates. At the end (31st day) number and percentage of germination, number of days until germination, mean germination time, germination rate, germination energy, maximum germination, germination value were calculated. Average germination percentage of pretreatments was 3.75, 43.75, 17.5, 1.25, 15 and 37.5, respectively. Mean of germination in soil factor were 1.04, 5.21, 22.7 and 11.3, respectively. Germination in control irrigation and same attributes were 8.75, 33.75, 27.5, 3.75, 11.25 and 37.5 in supplement irrigation. Germination in all treatments and at whole levels was on average 20.1%. The highest germination percentage was observed in the sand. The highest average germination was seen in Gibberellin treatment.
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