Ali Reza Mahmoodi; Ali Tavili; Hamid Reza Boostani; Mohammad Jafari; Salman Zare
Abstract
An appropriate amount of soil was picked up from the surface horizon (0-30 cm) from the rangeland of Darab city. After air drying and passing through a 2 mm sieve, some physical and chemical properties of the soil were measured. A factorial pot experiment was conducted in a completely randomized design ...
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An appropriate amount of soil was picked up from the surface horizon (0-30 cm) from the rangeland of Darab city. After air drying and passing through a 2 mm sieve, some physical and chemical properties of the soil were measured. A factorial pot experiment was conducted in a completely randomized design with four replications. The first factor includes biochars in 7 levels (no application of biochar (C), wheat biochar (1.5 % w/w) (GB1), wheat biochar (3 % w/w) (GB2), corn biochar (1.5 % w/w) (ZB1), corn biochar (3 % w/w) (ZB2), cotton biochars (1.5 % and 3% w/w) and the second factor includes the use of lead (Pb) at 3 levels (0 (Pb0), 150 (Pb150) and 300 (Pb300) mg kg-1 soil) under forage panicum cultivation. After copmpleting vegetative growth, the plants were cutted and harvested from 0.5 cm of the soil surface. This study indicated that with increasing the biochar levels from 0 to 3 % (w/w), the electrical conductivity (0.31, 0.15 and 0.02 dS/m), soil organic carbon (53, 59 and 63%) and soil pH (0.13, 0.05 and 0.15 units) were increased and the Pb availabity (16.12, 12.83 and 10.25%) was decreased, respectively. With enhancing the Pb levels from 0 to 300 mg kg-1 soil, the concentration of soil manganese (17.27%) and potassium (4.54%) availability were significantly reduced.
Alireza Eftekhari; Mohamad Jafari; Hossein Arzani; Aliakbar Mehrabi; Mohammad Reza Bihamta; Ehsan Zandi Esfahan; Nadia Kamali
Abstract
Given the role of rangelands in soil conservation and soil fertility, strengthening the soil of rangelands could be achieved by range management plans (RMP). Therefore, in this research, 15 summer rangelands and 16 winter rangelands with RMP were investigated to determine the effects of range management ...
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Given the role of rangelands in soil conservation and soil fertility, strengthening the soil of rangelands could be achieved by range management plans (RMP). Therefore, in this research, 15 summer rangelands and 16 winter rangelands with RMP were investigated to determine the effects of range management plans on some soil properties. In each rangeland with RMP and in each vegetation type, three soil profiles were dug and soil samples were collected at two different depths. Beside each rangeland with a RMP, a rangeland with a same vegetation type and without RMP was selected for comparison and sampling was conducted. Organic matter, nitrogen, potassium, and phosphorus were measured in the laboratory. The data from two different range management types were analyzed in an independent sample T test using SPSS software. The results showed that, in summer rangelands, range management plans could increase the amount of some factors like phosphorus, nitrogen, and organic matter, while it had no significant impact on some other factors, including the amount of potassium and increasing the depth of horizon A. However, in the winter rangelands, the plans had no significant effect on strengthening the soil of rangelands and it seems that due to the slow changes of soil in arid areas, more time is needed to make significant changes in the soil.
afshin sadeghirad; Hossein azarnivand; mohamad jafari; mohamadali zarechahoki
Abstract
Nowadays climate change, is the most significant threat in terms of sustainable development, particularly in developing countries. So regarding to rangeland ecosystems and their ability is a Particular attention to sequester carbon. This study aimed to assessing the carbon sequestration potential of ...
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Nowadays climate change, is the most significant threat in terms of sustainable development, particularly in developing countries. So regarding to rangeland ecosystems and their ability is a Particular attention to sequester carbon. This study aimed to assessing the carbon sequestration potential of natural and planted ranges through selected three species S. barbata, S.rigida and A.canescens. sampling from vegetation and soil have done along three 200 meters parallel transects by Systematic - random method. So that were taken 30 vegetable and 36 soil samples which were measured the organic carbon plants samples and some physical and chemical properties of soil In the laboratory. Then, by multiplying the amount of organic carbon in soil bulk density, was calculated total weight of carbon sequestration in soil depth. The results showed that among the three sites, the depth first of the soil, the amount of silt, sand, organic carbon, PH and EC (electrical conductivity) and In the second depth of the soil, the amount of silt, organic carbon, nitrogen, PH and EC there was a significant difference at 5% level. The comparison of carbon sequestration to the total habitat by Duncan's test showed that all three species were significantly different from each other at 5% level, So that the greatest amount of carbon stored is in the A.canescens planting of rangeland (39/84 ton/ ha) and the lowest Natural rangeland S.rigida (36/24 ton/ha), However the Natural range S.barbata was intermediate between both other species (31/34 ton/hac).
khadije naghizadeh; mohammad jafari; hosein azarnivand; mohamad ali zare chahiiki; Hamidreza Abasi
Abstract
The effect of environmental factors on vegetation diversity in Eshtehard rangeland was studied in present study. Sampling was done using Minimal Area method. To measure the plant properties in each type, regarding the extent of each type, three 500 meter transects with 50 meter intervals between transects ...
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The effect of environmental factors on vegetation diversity in Eshtehard rangeland was studied in present study. Sampling was done using Minimal Area method. To measure the plant properties in each type, regarding the extent of each type, three 500 meter transects with 50 meter intervals between transects (due to the scarce vegetation cover) were established. In each plot, the number and types of existing species and their percentages were determined. Also, profiles were dug at the beginning and end of each transect and soil specimens were sampled at 0- 20 cm depth. Among soil properties, the percentage of clay, silt, sand, organic matter, lime, acidity, electrical conductivity, calcium, magnesium, sodium and potassium were measured. After collecting data, Shanon-Winer species diversity and Simpson indices were determined using Ecological methodology Software. Finally, the most important factors effecting the species diversity variation were specified using Principle Component Analysis. The results showed that among the studied factors, elevation, slope, soil depth and lime are the most effective ones.
fatemeh naghizadeh; mohammad jafari; hosein azarnivand; Mohammad Ali Zare Chahouki
Abstract
In this study, the role of soil properties in making difference between plant communitieswas examined. First, four plant types were identified, including Pteropyrumaucheri-Salsolarigida، Astragalus gossypinus - Acanthophyllum herateens، Amygdalus scoparia – Achilla millefolium and Ephedra intermedia ...
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In this study, the role of soil properties in making difference between plant communitieswas examined. First, four plant types were identified, including Pteropyrumaucheri-Salsolarigida، Astragalus gossypinus - Acanthophyllum herateens، Amygdalus scoparia – Achilla millefolium and Ephedra intermedia – Erigon capestra, through randomized systematic sampling and field survey in representative area of each type. In each plant type, three 500-meter transects were selected and in each transect, ten plots were placed along each transect. Characteristics of vegetation such as type and percentage of cover, gravel percentage, litter percentage and bare soil percentage were determined within each plot. In addition, in order to study the soil properties, at the beginning and at the end of each transect, a profile was dug and soil samples were taken from the depths of 0-20, 20-80 cm. Soil physical and chemical properties (texture, pH, electrical conductivity, organic matter percentage, gypsum percentage, lime percentage, salts such as sodium, potassium, calcium and magnesium, sodium absorption ratio, sodium exchange percentage) were determined in soil laboratory. Then, the role of soil properties in making difference between plant communitieswas determined by using ANOVA statistical analysis, and the key factors making this difference were introduced as sand percentage, organic matter percentage, and electrical conductivity.
