alireza Jamshidi; Navazollah Moradi; Marzieh Rezai
Volume 29, Issue 1 , February 2022, , Pages 112-132
Abstract
Changes in different solute compounds in edaphic factors affect the spatial distribution of plant species, especially hemicryptophytes.Soil salinity is one of the most common desertification factors in arid and semi-arid regions that contributes to the degradation of the soils of regions susceptible ...
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Changes in different solute compounds in edaphic factors affect the spatial distribution of plant species, especially hemicryptophytes.Soil salinity is one of the most common desertification factors in arid and semi-arid regions that contributes to the degradation of the soils of regions susceptible to desertification and eventually leads to a decreased soil ecological potential which is considered as one of the most significant factors that intensifies desertification. In order to explore the impact of principal components of soil on the diversity of plant types in the forest regions scattered along the coastal belt of the Persian Gulf and Oman Sea, current research was conducted on saline soils in Hasan Langi Village. Analysis of correlation coefficient between different traits of the plants in the respective vegetation (percentage of coverage, height and density and diversity) and the soil parameters of the habitats indicated that these vegetative parameters were mostly correlated with acidity, texture, and total calcium and magnesium. Principal component analysis (PCA) demonstrated that components 1 and 2 explained a total of 85% variance suggesting the largest impact of soil factors on differentiation of vegetation. In total, the factor of diversity was most correlated with calcium and magnesium in the second depth while other vegetative characteristics were directly correlated with the amount of sodium and potassium as well as electrical conduction in the first depth and the amount of calcium in the second depth.
Zahra Soleymani; Hannaneh Mohmmadi Kangarani; Marzieh Rezai; Mahnaz Hosseinzadeh
Volume 28, Issue 4 , November 2021, , Pages 787-803
Abstract
Participatory management in the protection of desert ecosystems is important due to the high sensitivity and fragility of these ecosystems. However, insufficient attention to the position of stakeholders in the social relations network has led to its failure. Therefore, identifying ...
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Participatory management in the protection of desert ecosystems is important due to the high sensitivity and fragility of these ecosystems. However, insufficient attention to the position of stakeholders in the social relations network has led to its failure. Therefore, identifying key actors is significant in the participatory management of the desert ecosystems. This study was conducted to investigate the coherence of the cooperation network and determine the key actors of government stakeholders at both levels of government and public institutions considering the participatory management approach. Information and data were collected through surveying, interviews, and participating meetings with representatives of the organizations and local communities. After identifying 45 beneficiary government institutions, a social network analysis questionnaire was developed and completed by 41 members of the local community and 34 members of the governmental institutions. Then, the prepared data were entered into the Microsoft Excel software and were analyzed using the UCINET6.718 software. Two one-dimensional matrices of organization-organization and people-organization were used to delineate the networks; then, different macro and micro indicators of the network such as density, shear points, degree centrality, and betweenness centrality were calculated to interpret the networks. The results showed that density index in both organization-organization (0.672) and people-organization (0.77) cooperation networks were evaluated more than average. So, it is acceptable. Also, the Department of Environmental Protection of Qeshm city has the highest index of betweenness centrality among 45 identified devices in both cooperation networks. Therefore, more cooperation of the organizations involved in participatory management of natural resources is suggested to protect and develop the mangrove forests to reduce each type of environmental pollution.
mohammad ekrami; rasool mahdavi; mazieh rezaei; hassan vagharfard; Jalal Barkhordari
Volume 27, Issue 3 , October 2020, , Pages 577-595
Abstract
Drought can reduce the sustainable production of natural ecosystems, including rangelands. The main purpose of this study was to expand the vulnerability of rangelands drought in the Pishkuh watershed in Yazd province. In the present study, geographical information systems ...
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Drought can reduce the sustainable production of natural ecosystems, including rangelands. The main purpose of this study was to expand the vulnerability of rangelands drought in the Pishkuh watershed in Yazd province. In the present study, geographical information systems and multi-criteria decision-making method (AHP) were used. In this regard, the parameters affecting the drought vulnerability of rangelands of the study area, including slope, slope direction, precipitation, soil texture, and evaporation were extracted and converted into information layers with the help of GIS. After weighing the layers in terms of importance in drought vulnerability in the framework of multi-criteria decision making (MCDM), the final combination and drought vulnerability map of the study area was prepared. Also, to control and measure the final map, field studies of the study area were used. Finally, a map of the dominant rangeland vegetation type was prepared and overlapped with the drought vulnerability map of the rangelands of the study area to identify the most resistant and vulnerable rangeland vegetation type. The results showed that the highest weight of the effective parameters in rangeland drought vulnerability was related to the precipitation with a value of 0.54, and the lowest weight was related to the slope with a value of 0.061. Based on the results, the eastern, southeastern, and southern regions of the Pishkuh watershed have the highest rate of rangelands drought vulnerability, and Ar.au-St.ba.Sc.or type is the most vulnerable vegetation type in the study area. It is recommended that more management resources and strategies be implemented in vulnerable rangelands to protect the soil and its vegetation.