Mohsen Shabani; Maryam Azarakhshi; Jalil Farzadmehr; Masoud Bazrafshan
Volume 26, Issue 2 , July 2019, , Pages 423-431
Abstract
The cultivation of plants that are resistant in difficult environmental conditions is an effective solution for reclamation of lands; thus, recognizing the effects of cultivation of different plants on soil and vegetation cover could be a suitable guide to select proper species by ...
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The cultivation of plants that are resistant in difficult environmental conditions is an effective solution for reclamation of lands; thus, recognizing the effects of cultivation of different plants on soil and vegetation cover could be a suitable guide to select proper species by experts. The aim of this research was to investigate the effects of range improvement and reclamation practices on soil and vegetation cover characteristics in Jannat Abad rangeland. For this purpose, four transects of 100-m length and two transects of 100-m length were established with 100-m intervals in the seedling area (Atriplex canescens and Haloxylon aphyllum) and the control area (natural vegetation), respectively. Along each transect, 10 plots of 4m2 were sampled. In each plot, the vegetation data including canopy cover percentage, litter, gravel, bare soil, dominant species, and plant density were measured. Soil profiles were dug at the beginning and end of each transect. Soil sampling was performed from 0-30, 30-60 and 60-90 cm depths. Then, soil chemical and physical properties including electrical conductivity, pH, organic matter, phosphorus, potassium, nitrogen, bulk density, clay, silt, and sand percentage. The collected data were analyzed by independent t-test with SPSS software. Results showed that the cultivation of Atriplex canescens caused an increase in canopy cover percentage, density, and potassium content in the first and second depths (P<0.01), and caused an increase in the nitrogen content of the first depth, organic matter of the second depth, electrical conductivity of the first and second depths, and silt percentage in the first and third depths (P<0.05). It also caused a decrease in soil pH and sand percentage of the second and third depths (P<0.05). The cultivation of Haloxylon aphyllum caused an increase in density, electrical conductivity of the first depth, and a decrease in clay percentage in the third depth (P<0.05), compared to the control area.
manijeh mahdizadeh; ali golkarian; kamaeddin naseraddin; ali asghar taleban fard
Volume 24, Issue 1 , May 2017, , Pages 30-38
Abstract
The relationship between soil and plant has long been considered, leading to the greatest benefits to humans. This study was aimed to investigate the effect of soil properties on establishment of Haloxylon aphyllum. For this purpose, in two adjacent regions with different soil, some of the physical ...
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The relationship between soil and plant has long been considered, leading to the greatest benefits to humans. This study was aimed to investigate the effect of soil properties on establishment of Haloxylon aphyllum. For this purpose, in two adjacent regions with different soil, some of the physical and chemical properties of soil and growth parameters of Haloxylon were measured in Gonabad and Mah'velat cities. Data were analyzed using the Minitab software through the two-sample t test. According to the results, soil parameters including the percentage of lime, potassium and phosphorus had no significant effect on the growth of Haloxylon. However, increased soil saturation percentage, reduced soil pH and increased amount of carbon and nitrogen in furrow cultivation, and low electrical conductivity in the pits filled with sediments as well as fine soil texture in two cultivations led to improve the growth of Haloxylon. Also, soil salinity does not affect the viability of this species.
hosein Mirzaee nodoushan; Hasan rouhipour; zeynab zare; fereshte asadi korom; salman zare
Volume 22, Issue 4 , March 2015, , Pages 768-777
Abstract
The research was conducted based on genetic variation of a black saxaul (Haloxylon aphyllum) plant population to find possible differences between the genotypes of the population, confronting various levels of water stress. A great number of progenies of four genotypes of the species were studied under ...
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The research was conducted based on genetic variation of a black saxaul (Haloxylon aphyllum) plant population to find possible differences between the genotypes of the population, confronting various levels of water stress. A great number of progenies of four genotypes of the species were studied under four levels of water stress, field capacity, 20, 50, and 80% of available water by the plant, using a factorial statistical model based on randomized complete block design. Branch number and length, main-stem and crown diameter, leaf chlorophyll content and leaf osmotic potential were recorded during and at the end of growing season. Studies on genotype and water stress factors revealed, although there were significant differences between the genotypes based on the studied characters, water stress levels were not significantly different based on the short duration of the research. Species such as Haloxylon, which is not fast growing species, would not respond to the stress levels during a short period of time. The genotypes were significantly different based on leaf chlorophyll content. Correlation coefficients between the morphologic characteristics were also noticeable. Negative significant correlation between leaf chlorophyll with branch number and trunk diameter implied that desert plant species such as the species under study would take advantage of light color of less chlorophyll content to cope with high temperature and sun light of their habitats.
Razieh Mohammadi; Kamaladdin Naseri; Gholamali Heshmati
Volume 21, Issue 1 , June 2014, , Pages 119-127
Abstract
This study was conducted to investigate the effects of Haloxylon aphyllum plantation on natural plant communities and soil properties of Abbas-Abad area in Khorasan Razavi Province. For this purpose, Haloxylon plantation and control areas were selected to compare with each other. In each area, fifty- ...
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This study was conducted to investigate the effects of Haloxylon aphyllum plantation on natural plant communities and soil properties of Abbas-Abad area in Khorasan Razavi Province. For this purpose, Haloxylon plantation and control areas were selected to compare with each other. In each area, fifty- meter transects were located by random-systematic method. Measurements were done by point sampling method. Eighteen soil samples were collected from Haloxylon plantation and control areas to determine EC and pH values in the laboratory. Data were analyzed by t-test. According to the results, although higher species diversity was significant in Haloxylon plantation area (P<0/05), Haloxylon caused the replacement of non-native communities, so that only 64.28% of species composition in Haloxylon plantation area was similar to the control area. On the other hand, higher soil pH and EC in Haloxylon plantation area was significant (P<0/01) and probably in the long term, Haloxylon causes the salinity and alkalinity of the soil surface.
Nejatali Salar
Volume 16, Issue 2 , December 2009, , Pages 224-233
Abstract
Regeneration of black saxual (Haloxylon aphyllum) is an important project for sand dune fixation in desert area of Iran. Success of this project is largely depending on climate conditions and soil physical properties. In order to determine some inhibitor factors of black saxual growth, a project were ...
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Regeneration of black saxual (Haloxylon aphyllum) is an important project for sand dune fixation in desert area of Iran. Success of this project is largely depending on climate conditions and soil physical properties. In order to determine some inhibitor factors of black saxual growth, a project were conducted in a 2 ha black saxual site in Semnan, Iran. Morphological traits as: plant height, canopy cover, collar diameter and collar first sympodial interval and growth index were recorded on 5 year old shrubs. At the mean time soil properties as: EC, pH, SP and Texture (silt, clay, sand), were measured. The relationships among plant growth indices and soil properties showed a negative correlation (P£0.05) between growth index and saturation percent (SP). It was concluded that SP factor was the most important factor to inhibit black saxual growth in Semnan province, Iran
Gholam reza Zehtabian; Jamal Bakhshi; Mehrnush Ghadimi; Nader Biroudian
Volume 15, Issue 4 , January 2009, , Pages 436-446
Abstract
As the recognition impact of a plant specie plantation in a specific area can determine the effects of that plant in other parts and areas of the country, the effects of Haloxylon plantation on the stand understory in desert lands of Ardestan were studied. Three areas of Haloxylon plantation and a reference ...
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As the recognition impact of a plant specie plantation in a specific area can determine the effects of that plant in other parts and areas of the country, the effects of Haloxylon plantation on the stand understory in desert lands of Ardestan were studied. Three areas of Haloxylon plantation and a reference site which were approximately similar in terms of altitude (height), slope, soil, and geomorphology have been selected. The necessary number of plots in each area was chosen on statistical base. In this study the plant density and crown closure of the understory species in the Haloxylon stand and also, the reference area were measured. Then, by using Dankan Test and Analysis of Variance through SPSS package the achieved data of the sampling were analyzed. The study conducted that there was a significant difference between the understory coverage of plantation areas and the reference site. It is concluded that the Haloxylon plantation caused a great deal of increasing in understory species number and composition.
Naser Baghestani Maybodi; Mohammad taghi Zare; Mohammad Abolghasemi
Volume 14, Issue 4 , February 2008, , Pages 478-489
Abstract
Wilted and dried up stands of haloxylon aphyllumspecies in afforested areas of Yazd has allways been a focal point of natural resources experts. Using various pruning treatments, the effect of pruning on the wideness of canopy cover and vigor of 12-year-old semi-trees of haloxylon aphyllumhad been evaluated ...
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Wilted and dried up stands of haloxylon aphyllumspecies in afforested areas of Yazd has allways been a focal point of natural resources experts. Using various pruning treatments, the effect of pruning on the wideness of canopy cover and vigor of 12-year-old semi-trees of haloxylon aphyllumhad been evaluated formerly. That study had been conducted in two different sections of the forest in the winter of years 1994. One section had shown a tree-density of 125 semi-trees per hectare, and the other had represented a tree-density of 250 semi-trees per hectare. The treatments included cutting at different heights of 70, 35, 10 cm and also no cutting (control). The results of that previous six-year study (1994-2000) showed that pruning increased vigority and regrowth of plants treated with different levels of pruning. The 35-cm pruning treatment was preferred over other treatments. At the end of growing season of year 2005, eleven years after pruning treatments, the same trees were evaluated for the second time. Results of the new study (in 2005) showed that while non-pruning (control) 23-year-old semi-trees are wilted and almost dried up, the semi-trees with pruning are vigorous and healthy. In terms of canopy cover and height, no significant difference was found between trees with different pruning treatment in the 5 years of 2000-2005. There was a significant reduction in the canopy cover and height of non-pruning (control) semi-trees (p<0.05). For the semi-trees which had been cut at a height of 35 cm, the diameter of canopy and the height were 262 and 164 cm, respectively. This semi-trees showed a good resistance against movement of sands and sand dunes.