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مرتع 2025, 19(1): 1-13 |
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Ghavampoor M, Mirjalili S A, Jafari M, Azarnivand H, Javadi A. Investigation of Tamarix androssowii Litv. reaction to some environmental variables in stands of Isfahan province. مرتع 2025; 19 (1) :1-13
URL: http://rangelandsrm.ir/article-1-973-en.html
URL: http://rangelandsrm.ir/article-1-973-en.html
Mohammadali Ghavampoor 
, Seyed Abbas Mirjalili , Mohammad Jafari , Hossein Azarnivand , Akbar Javadi
, Seyed Abbas Mirjalili , Mohammad Jafari , Hossein Azarnivand , Akbar Javadi
Imam Khomeini Higher Education Center, Agricultural Research, Education and Extension Organization (AREEO), Tehran
Abstract: (2295 Views)
Background and objectives: The conservation of endemic and endangered species is a fundamental requirement for effective ecological management. Understanding the ecological requirements of such species and their interactions with environmental factors is critical for their preservation. This study aims to identify the key ecological factors influencing the distribution of Tamarix androssowii Litv. and examine the relationship between soil characteristics and vegetation across different stands in Isfahan Province. The findings will contribute to a broader understanding of the species' ecological needs and their potential application in other arid and semi-arid regions.
Methodology: The distribution and stand characteristics of Tamarix androssowii were examined in four regions of Isfahan Province: Habibabad, Sejzi, Khara, and Shakhkonar. Soil sampling and vegetation assessments—including canopy cover percentage, density, and average plant height—were conducted in 10 plots per site. Elevation and slope data were also recorded. Soil samples were collected at depths of 0–30 cm and 30–70 cm and analyzed for pH, electrical conductivity (EC), calcium and magnesium content, sodium absorption ratio (SAR), gypsum percentage, total neutralizing value (TNV), sodium concentration, and sand, clay, and silt composition. Multivariate statistical analysis was conducted using CANOCO 4.5 and PC-Ordination software to explore the relationships between species distribution and environmental factors. Duncan’s mean comparison test was applied in SPSS 25 software (with a 5% confidence level) to assess differences among sites.
Results: The dendrogram analysis indicated no significant variation among the four study sites based on edaphic factors, suggesting that all locations can be considered as a single stand for Tamarix androssowii. TNV exhibited an increase at deeper soil layers due to leaching effects. EC, gypsum percentage, sodium concentration, and SAR displayed a decreasing trend with increasing soil depth. The combined calcium and magnesium content was lower in the deeper soil layer, consistent with the inherent characteristics of these sites. Principal Component Analysis (PCA) effectively illustrated the relationships between environmental variables and vegetation distribution, with the first two axes accounting for 86.7% of total variation. The results indicated that Tamarix androssowii primarily thrives in sandy loam soil texture. Gypsum percentage was identified as the most influential factor in determining species density, while canopy cover and plant height were more significantly affected by silt and clay content. Moreover, the electrical conductivity and sodium concentration were higher in the surface layer (0–30 cm) due to litter decomposition, contributing to variations in soil properties across depths.
Conclusion: By identifying key environmental factors affecting the distribution of Tamarix androssowii, this study provides insights that can be applied to similar ecosystems. The findings contribute to the development of conservation strategies aimed at protecting and sustaining populations of Tamarix androssowii in arid and semi-arid regions.
Methodology: The distribution and stand characteristics of Tamarix androssowii were examined in four regions of Isfahan Province: Habibabad, Sejzi, Khara, and Shakhkonar. Soil sampling and vegetation assessments—including canopy cover percentage, density, and average plant height—were conducted in 10 plots per site. Elevation and slope data were also recorded. Soil samples were collected at depths of 0–30 cm and 30–70 cm and analyzed for pH, electrical conductivity (EC), calcium and magnesium content, sodium absorption ratio (SAR), gypsum percentage, total neutralizing value (TNV), sodium concentration, and sand, clay, and silt composition. Multivariate statistical analysis was conducted using CANOCO 4.5 and PC-Ordination software to explore the relationships between species distribution and environmental factors. Duncan’s mean comparison test was applied in SPSS 25 software (with a 5% confidence level) to assess differences among sites.
Results: The dendrogram analysis indicated no significant variation among the four study sites based on edaphic factors, suggesting that all locations can be considered as a single stand for Tamarix androssowii. TNV exhibited an increase at deeper soil layers due to leaching effects. EC, gypsum percentage, sodium concentration, and SAR displayed a decreasing trend with increasing soil depth. The combined calcium and magnesium content was lower in the deeper soil layer, consistent with the inherent characteristics of these sites. Principal Component Analysis (PCA) effectively illustrated the relationships between environmental variables and vegetation distribution, with the first two axes accounting for 86.7% of total variation. The results indicated that Tamarix androssowii primarily thrives in sandy loam soil texture. Gypsum percentage was identified as the most influential factor in determining species density, while canopy cover and plant height were more significantly affected by silt and clay content. Moreover, the electrical conductivity and sodium concentration were higher in the surface layer (0–30 cm) due to litter decomposition, contributing to variations in soil properties across depths.
Conclusion: By identifying key environmental factors affecting the distribution of Tamarix androssowii, this study provides insights that can be applied to similar ecosystems. The findings contribute to the development of conservation strategies aimed at protecting and sustaining populations of Tamarix androssowii in arid and semi-arid regions.
Type of Study: Research |
Subject:
Special
Received: 2021/02/6 | Accepted: 2023/01/14 | Published: 2025/03/30
Received: 2021/02/6 | Accepted: 2023/01/14 | Published: 2025/03/30
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