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Articles by H. Jalilvand
Total Records ( 7 ) for H. Jalilvand
  A. Fallah , H. Jalilvand , M. R. Pormajidian , S. Mohammadpoor Pashakolaei and Y. Kooch
  In this study, the afforestation stands of 18.1 ha with planting interval 2x2 m of Picea abies, at the age of 44 years old was investigated to compute increment and wood production in Kelardasht plantation (North of Iran). This stand was inventoried using region map and 70x70 m inventory grid. The samples were taken by randomized-systematic method. Increment statistical factors in 32 sample plots with 500 m2 area were measured. Inside each plot, Diameter at Breast Height (DBH) of whole trees and height of four witness trees (two thickness trees inside the plot and two nearest trees to center of plot) were measured. Results of this research showed that survival percentage of Picea abies at the age of 44 years old was 39.3% in Kelardasht region. Also, the average of stand diameter, height, basal area, volume, annual volume increment and form factor were 16.86 cm, 18.20 m, 23.59 m2 ha-1, 193.73 m3 ha-1, 4.4 m3/ha/year and 0.46, respectively. Considering obtaining results and comparing them with its main habitat, the stand increment amount and statistical parameters are low.
  G. Hosseinzadeh , H. Jalilvand and R. Tamartash
  Since the vegetation cover and soil characteristics impose a significant effect on performing a proper integrated management in rangeland ecosystems. We evaluated the changes of vegetation cover and soil characteristics under different grazing treatments in Eskelimroud basin located at west part of Savadkouh (Mazandaran province in Iran). Three adjacent areas under different grazing intensities including critical, key and enclosure (reference) had been selected. Statistical analysis of variance and group mean comparison showed that the enclosure area was mostly covered by vegetations of class I while dominant vegetation covers in the key and critical areas were covered by class II and class III types, respectively. These findings showed that increasing of grazing intensity, palatable species had been gradually replaced by unpalatable species, but in the reference area Graminea and palatable forbs was dominantly covered. Crown cover percentage and productivity was significantly differed at the 1% level between the reference and grazing areas. Analysis of variance of soil data showed that soil in reference area was mainly covered by dense herbaceous species containing more amounts of organic matter, nitrogen, electric conductivity, phosphorus and potassium as compared with grazing areas. In fact, it can be concluded that short term enclosure of vegetation cover and soil quality in Eskelimroud basin was due to its adequate rainfall and climate condition.
  H. Naghavi , A. Fallah , H. Jalilvand , J. Soosani and Y. Kooch
  The aim of this research was investigation of sampling method application with fixed plot in sampling of Zagros coppice forests (West of Iran). Zagros forests confronted with much damage before. These damages had due to destroying areas of forests and retrogradation formed in the other areas. Structure of these forests changed because of last years damages and coppice forests were formed, finally. Collection of appropriate qualitative and quantitative information is necessary for principle management and programming. An inventory network with 200x400 m dimension designed in study area for this research. Then, numbers of 40 witness plots with 1 ha area were produced. Samplings were performed by circle form sample plots with 10 ARE area (1 ARE = 100 m2 area) and square form sample plots with 15, 20, 30, 40 and 50 ARE areas within mentioned 1 ha plots. The obtained results of sampling different methods for estimation number of group coppice per hectare and crown covering were compared with results of witness plots. Analysis of Variance (ANOVA), compare means test (LSD) at p<0.05 and percent of standard error (E %) were used for comparison of the means. Results of this research showed that number per hectare parameter of 20 ARE plots had significant differences with results of witness plots. The other plots had no significant differences viewpoint number per hectare parameter. The minimum and maximum of E% were observed in circle form sample plots with 10 ARE (E% = 10.82%) and 50 ARE (E% = 8.12%) areas, respectively for number per hectare parameter.
  Y. Kooch , H. Jalilvand , M.A. Bahmanyar and M.R. Pormajidian
  The objectives of this study were to investigate the abundance, biomass and practical distribution of earthworms in ecosystem and tried to identify the factors affecting earthworm populations during different environmental conditions. Density and biomass of earthworms were studied in ecosystem unit`s khanikan forests (North of Iran) in July 2006. Eighteen soil profiles (50x50 cm) to the depth of 30 cm were digged and soil samples were taken from organic horizon (litter layer) and mineral layers (0-10, 10-20 and 20-30 cm). Earthworms were collected by hand sorting method, then oven-dried at 60°C and weighed. Comparison number and biomass of earthworms in various layers of soil have showed that most number was in third layer (63.63%) and the least number was in second layer (13.63%). Also, biomass of earthworms in third layer was the most (79.39%) and was the least in second layer (7.57%). Results of this research indicated that correlation between number and biomass of earthworms with C/N, biomass of earthworms with carbon of soil and number of earthworms with theirs biomass were significant. Correlation between number and biomass of earthworms with the other soil properties investigated was no significant.
  H. Jalilvand , Y. Kooch , M.A. Bahamnyar and M.R. Pormajidian
  Ecological species group were developed for hornbeam forest ecosystems in North of Iran that had been moderately disturbed. Species groups were determined from field observations and sample plot data arranged and analyzed in association tables. The groups 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 (TWINSPAN). The objectives of the study were to develop ecological species groups for lowland ecosystems types dominated by hornbeam in north of Iran, describe the site indicator values of species groups and increase our understanding of site-species relationships in moderately disturbed landscape in Khanikan lowland forests of Mazandaran province. Five vegetation groups were identified after the application of TWINSPAN programs. They are named after the characterizing species as follows: Menta aquatica (I), Oplismenus undulatifolius (II), Carex grioletia (III), Viola odarata (IV) and Rubus caesius (V). Result have showed that II, III vegetation groups and I, II vegetation groups had the most (65.5%) and the least (30%) of Sorenson similarity coefficient, respectively. Apparently, similarity coefficient of differentiated vegetation groups was high.
  R. Tamartash , H. Jalilvand and M.R. Tatian
  This research is conducted to study the effects of grazing on chemical soil properties and vegetation cover in three areas separated as the key, reference and critical areas. The study area is located at the river basin of Kojour in the Southwestern of Noushahr (in the North of IR-Iran). Sampling and collecting the soil and vegetation cover data from the site areas are accomplished in the first step of the research. The vegetation cover data was collected in 20 sample plots of 1 m2 in each area. The data was collected through a random- systematic method in the early grazing season. The soil data was collected out of two layers (0-10, 10-30 cm), in two time intervals before and after grazing. Five samples were selected per layer. Some edaphical factors such as organic carbon, percentage of soil organic matters, total nitrogen, absorbable phosphorus and potassium, pH and EC were measured. The results revealed that there is an inverse relationship between the grazing intensity and amount of carbon, nitrogen, soil organic matter and EC. However, a direct relation exists between the grazing intensity and amount of soil potassium, phosphorus, pH and the ratio of carbon to nitrogen. Vegetation in class 1 and 2 which were cereals and forbs had greatest percentage in the reference area. Furthermore, the percentage forage cover increases with the grazing intensity. The more unpalatable vegetation of class 3 forms the prevailing coverage in the critical area. The conclusion of this study shows that overgrazing is considered as a threat for the nutritional elements of soil and vegetation cover.
  A. Ghasemi , H. Jalilvand and S. Mohajeri Borazjani
  The purpose of this project was to asses ecological development of Avicennia marina in hyper saline condition. During 2001 and 2002 a restoration mangrove project planting A. marina in artificial inlet in Bushehr Province, Iran was carried out in Agriculture and Natural resources research center of Bushehr province in Sabkha lands. Some the vegetative characteristics of such as height, diameter and crown diameter in two aspects were recorded in 2012. To investigate physico-chemical properties of soil were taken in inside and outside of inlet and were analyzed: salinity, soil acidity, potassium, phosphorus, nitrogen, texture of soil were measured. Both of treatments were analyzed by t-test in SAS Software.
 
 
 
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