Toktam Imani; Mahdi Delghandi; Samad Emamgholizadeh; Zahra Ganji Noroozi
Abstract
Flood hazard assessment is an important topic that can reduce flood-related losses. Rainfall-runoff modeling plays a key role in the management of water resources in addition to protecting from flood hazards. The use of hydrological models to simulate the runoff necessitates the proper calibration of ...
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Flood hazard assessment is an important topic that can reduce flood-related losses. Rainfall-runoff modeling plays a key role in the management of water resources in addition to protecting from flood hazards. The use of hydrological models to simulate the runoff necessitates the proper calibration of the different parameters. Therefore, In the present study, the Watershed Modeling System (WMS11.0) was evaluated to simulate peak discharge and volume of floods of Babolrood catchment. WMS model calibrated and validated using 3 and 2 rainfall events, respectively. Afterwards, design precipitation (DP) for 2, 5, 10, 25, 50, 100 and 500-year return periods was determined and flood resulting from DPs simulated. The results showed that the WMS model could accurately estimate the peak discharge (the error was about 5%) and the and flood volume (the error was less than 26%). But the model was not able to simulate properly the shape of the hydrograph. It also revealed that peak discharge and flood volume arising from 2 to 500-year return periods of rainfall vary between 50 to 300 m3/s and 6.6 to 32.4 Mm3, respectively.
Ali Azareh; Elham Rafiei Sardooi
Abstract
The purpose of this study is to investigate land use changes in the past and predict future land use using land change modeler in Halil River watershed. The detection of land use changes was performed using Landsat satellite images (L5-TM-1991, L7- ETM+-2003 and L8-OLI-2020). Transition potential modeling ...
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The purpose of this study is to investigate land use changes in the past and predict future land use using land change modeler in Halil River watershed. The detection of land use changes was performed using Landsat satellite images (L5-TM-1991, L7- ETM+-2003 and L8-OLI-2020). Transition potential modeling was done using MLP neural network method and eight variables including altitude, slope, aspect, distance to road, distance to river, distance to agricultural lands, distance to urban and Normalized Difference Vegetation Index (NDVI). Finally, the Markov chain was used to predict future land use changes. Investigating the calibration periods using kappa statistics showed that the period of 1991-2020 had the highest accuracy to predict land use for 2041. The results of land use changes indicated that during the calibration period, among the six categories namely rangeland, agricultural land, residential land, barren land, rock and orchard, the highest increase and the highest decrease in area was related to agricultural lands and rangelands by 293.7 and 382.6 km2, respectively. Also, the area of barren lands, orchard and residential lands has increased and rocky lands have remained unchanged. The degradation of rangelands has been more in line with the conversion of these lands into agricultural, orchard and residential lands. Also, the prediction of future land use map (2041) using land change modeler showed that , the area of rangelands will decrease by 201.1 km2 and the area of agricultural lands, residential lands, orchards and barren lands will increase by 158.01, 22.38, 20.2 and 0.53 km2, respectively.
Nahid Moshtagh; Reza Jafari; Saied Soltani; Nafiseh Ramezani
Abstract
Land surface temperature (LST) is an essential parameter in ecological, hydrologic, climatic, and related studies. The objective of this study was to evaluate the performance of Artis and Sobrino algorithms for retrieving LST from 2009 Landsat TM thermal infrared band in Damaneh region of Isfahan province. ...
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Land surface temperature (LST) is an essential parameter in ecological, hydrologic, climatic, and related studies. The objective of this study was to evaluate the performance of Artis and Sobrino algorithms for retrieving LST from 2009 Landsat TM thermal infrared band in Damaneh region of Isfahan province. The accuracy of LST extracted from geometrically corrected image was then assessed against field-based LST data recorded at 10 meteorological stations using linear regression analysis. The results showed that both algorithms were able to map LST spatial distribution in the region and they were significantly correlated (R>0.97), but the Artis algorithm performed slightly better than Sobrino one. This algorithm explained up to 72% of the variation in the field measurements of LST. According to this algorithm, bare lands and highly vegetated agricultural and rangeland areas had the highest (328k0) and lowest LST (291k0) in the region, respectively. As the results indicated here the decrease in vegetation cover corresponds with increase in temperature values, therefore, remotely-sensed LST information with their extensive coverage can have a key role in ecosystem management.
Ahmad Hajarian
Abstract
The purpose of this article is to investigate the obstacles and challenges of rangeland ecotourism from the perspective of experts and stakeholders using the Delphi method and confirmatory factor analysis.The present research is applied research in terms of purpose and descriptive-analytical research ...
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The purpose of this article is to investigate the obstacles and challenges of rangeland ecotourism from the perspective of experts and stakeholders using the Delphi method and confirmatory factor analysis.The present research is applied research in terms of purpose and descriptive-analytical research in nature and has a quantitative qualitative approach. The statistical population of the study consists of two groups. The first group included experts and the second group included stakeholders. The sample size for the first group was selected using snowball or chain sampling of 28 people and the second group is based on the statistics of about 1000 people in rural areas of Isfahan province, which was determined based on Cochran's formula of 276 people.Data analysis was performed using SPSS software version 23. In order to identify the existing challenges of rangeland ecotourism in rural communities of Isfahan province, Delphi technique was used. The results in the qualitative part of the research indicated that the most important challenges facing rangeland ecotourism are structural and managerial factors, policy-making, financial and economic factors, individual-personality, research and information. In the quantitative part, using confirmatory factor analysis, there are 5 factors, which are: financial and economic factors, managerial and structural factors, weakness of laws and comprehensive policy, research and information, and individual and personality factors, respectively, which is 78.73. Explains the percentage of total variance.
Mohsen Sabzi nojedeh; mina amani; Mehdi Younessi Hamzekhanlu; Leila badri‎; Omid Fathizadeh; Esmaeil Sheidai Karkaj
Abstract
In recent decades, the scientific community of the world has paid particular attention to the local and indigenous knowledge of medicinal plants and ethnobotany science. The purpose of this study was to introduce the culture of traditional use of medicinal herbs in Meshginshahr city for ...
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In recent decades, the scientific community of the world has paid particular attention to the local and indigenous knowledge of medicinal plants and ethnobotany science. The purpose of this study was to introduce the culture of traditional use of medicinal herbs in Meshginshahr city for treatment of diseases. For this purpose, local names, medicinal properties, method of use and other information of medicinal species were collected at the same time. In this study information of 25 families and 55 medicinal species was recorded from the region. The Lamiaceae, Asteraceae and Fabaceae families had the highest number of plant species, respectively. The most used medicinal plants in this region were applied for treatment of different ailments including, gastrointestinal, infectious and anti-inflammatory and pain. Most herbal species were used to treat gastrointestinal diseases, which 64% of informant people reported this. Maximum number of plant species was used for treatment of gastrointestinal diseases (50%), which 64% of informants noted this subject. In the otrher hand, the least used plants species were related to fungal and parasitic diseases (8%). The most used medicinal organs were leaf, flowering shoot and flower, respectively, which most of them were used as either boiled or bloated. Various medicinal species in Meshkinshahr and the growing interest among people to use medicinal herbs, gives the promise to take an important step in order to resistive economy by developing employment projects based on the cultivation and processing of medicinal plants.
hamzeh saeediyan; Hamid Reza Moradi; Sadat Feiznia; nader Bahramifar
Abstract
Acidic rainfall is one of the complications of industry life that a point of view geographically in recent years spread widely and the attention of many researchers has been found. These rains have significant effects on the different ecosystems of earth. In this study, in order to investigate the sensitivity ...
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Acidic rainfall is one of the complications of industry life that a point of view geographically in recent years spread widely and the attention of many researchers has been found. These rains have significant effects on the different ecosystems of earth. In this study, in order to investigate the sensitivity of erosion and sediment yield of Gachsaran Formation to acidic rainfall and its density change, parts of the Kuhe Gach watershed area in Izeh Township are selected with the area of 1202 hectares. This investigation in order to determine productivity runoff and sediment in 8 points and with 3 replicates in Gachsaran formation in different intensities 1, 1/25 mm in min and in the intensities of distilled water and 4, 5 acidic water in four aspects of northern, southern, eastern, western with using kamphorst rain simulator was done. In order to analyze statistical was used SPSS and EXCEL packages. The highest of runoff and sediment rates in Gachsaran formation in 1, 1/25 mm in min are related to 4 acidic rainfalls. The rainfall of 5 acidic also runoff and sediment are more than the rain of distilled water. The infiltration rates in rainfall different intensities also showed a significant difference.
reza shakeri; Mehdi Ghorbani; kamran shayesteh
Abstract
Sustainable land management requires the identification of key land use planning actors. Social network analysis is one of the best ways to identify important factors in Management change. In this study, to analyze the stakeholders related to participatory Management in the watershed of Anzali Wetland, ...
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Sustainable land management requires the identification of key land use planning actors. Social network analysis is one of the best ways to identify important factors in Management change. In this study, to analyze the stakeholders related to participatory Management in the watershed of Anzali Wetland, the criteria and policy indicators at the level of the network of organizational stakeholders were done using the method of social network analysis . In this regard, 36 organizational stakeholders related to participatory land use management in Gilan province were studied and analyzed. In this research indices of density, size, Reciprocity, Transitivity, Centralization and Geodesic Distance in the network of relationships at the macro level and Core-peripheral index in the middle scale and centrality indicators at the micro (actors) scale of the network were examined. Based on the results ofmacro-level indicators, the density is moderate and according to the results of the Reciprocity and the moderate amount of Mutual relations among organizational stakeholders, the cohesion and organizational capital are also assessed as moderate. The resilience and balance of the information exchange network are also low due to the low transitivity index. The results of the core-periphery index analysis show a higher density of links and greater organizational cohesion among central organizations compared to the peripheral subgroup. Also, the amount of information exchange between central and peripheral subgroups was evaluated as moderate. Based on the results of centrality indices, the geometric position of each actor was determined according to the desired criteria in the network
Khosro Shahbazi; Borzoo Yoosefi
Abstract
Therefore, in order to evaluate the cultivability of forage cactus (Opuntia ficus indica L.) in the Naft shahr of Qesir shirin city, Kermanshah province has been considered. Different treatments without irrigation, 1, 15, 30 days, once irrigation in three repetitions for three years were performed based ...
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Therefore, in order to evaluate the cultivability of forage cactus (Opuntia ficus indica L.) in the Naft shahr of Qesir shirin city, Kermanshah province has been considered. Different treatments without irrigation, 1, 15, 30 days, once irrigation in three repetitions for three years were performed based on a completely randomized block design. Cultivation of cactus plant in the first half of November and irrigation began on the first of June. The means of the results were compared using Duncan's multiple range test in SPSS software.The results of analysis of variance showed that the effect of irrigation cycle and the interaction effect of irrigation cycle at the time of measurement on the number of pads and plant height had a significant effect at the statistical level of 0.01. Survival of 75, 57, 43 and 38% of plants was obtained with 15-day irrigation cycle, 30-day treatment, one-time irrigation and no irrigation treatment, respectively. The results of this study show that planting cactus in areas with arid desert climate such as Qesir shirin and Somar in Kermanshah province is recommended due to its high adaptability. Dry forage production Cactus forage can be effective for livestock development in these and similar areas. Also, due to the role of cactus in soil conservation, it is possible to prevent the occurrence of dust, desertification, pasture destruction and soil erosion in the region by developing crops. Also,
Morteza Saberi; Vahid Karimian; Majid khazaei
Abstract
The allelopathic influence of aqueous extracts of Eucalyptus camaldulensis on Cassia angustifolia Vahl., Datura stramonium L. and Hibiscus sabdariffa L. germination (%), germination stages and seedling growth were examined. For this goal, the extract was prepared from the shoot and roots of Eucalyptus ...
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The allelopathic influence of aqueous extracts of Eucalyptus camaldulensis on Cassia angustifolia Vahl., Datura stramonium L. and Hibiscus sabdariffa L. germination (%), germination stages and seedling growth were examined. For this goal, the extract was prepared from the shoot and roots of Eucalyptus camaldulensis firstly. The extract was diluted by adding distilled water to 0 (control), 25, 50, 75 and 100 percent. The effect of the four mentioned treatments, as well as distilled water as control were studied in four repetitions on seed germination using a completely randomized design. Results showed that there were significant differences among the measured characteristics for germination percentage and speed, length of root, length of shoot, length seedling and vigority index (p<1%) in all three species. Comparison of means indicated that increasing the concentration of allelopathic extract of Eucalyptus decreased seed germination and initial growth of seedlings in all three species significantly. The highest germination percentage and speed was belonging to Hibiscus sabdariffa (60% and 3.5) at zero concentration (control). Also, germination of Datura stramonium done only until concentration of 25 percent (20%) and at concentrations 50, 75 and 100 % it was zero. According to the results Datura stramonium had more sensibility than two other species related to allelopathic effect of Eucalyptus camaldulensis. Generally, it is recommended not to plant eucalyptus as a windbreak with medicinal species Cassia angustifolia, Datura stramonium and Hibiscus sabdariffa as much as possible in the study area.
Aliakbar Nazari Samani; Aryan Salvati
Abstract
Having knowledge on the quantitative amount of watershed sediment yield is one of the most basic information to deal with soil erosion and conservation as well as design of dams. In Iran, the estimation of suspended sediment load is often based on measurement curve methods. Since sediment discharge data ...
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Having knowledge on the quantitative amount of watershed sediment yield is one of the most basic information to deal with soil erosion and conservation as well as design of dams. In Iran, the estimation of suspended sediment load is often based on measurement curve methods. Since sediment discharge data are random and discontinuous, in practice, their internalization and extrapolation is associated with many errors. This review is to evaluate the number of data available to estimate daily sediment load with Loadest regression models. Therefore, daily discharge data of Ghazaghli station in Gorganrood forest watershed were used. So that different percentages of available data were accidentally deleted and the amount of sediment load was estimated by 11 methods. According to the evaluation results (Taylor diagram), model number 2 has the best accuracy and in the absence of up to 50% of the daily sediment data, the correlation coefficient of more than 0/5 in the annual sediment estimation and only for the first year And in the rest of the years under study the correlation coefficient is unacceptable. Therefore, the use of sediment measurement curve methods with the data available at the level of Iranian stations, if the number of data available to construct the measurement curve is less than 185 will be associated with very little accuracy. Also, the higher the amount of available data belonging to the periods of low sediment transport (autumn and dry years), the lower the efficiency of the Loadest method will be.
Shiva Eyvazi; Sasan Babaei Kafaki; Mohammad Jafari; Mohammad Tahmoures
Abstract
Water, soil, pasture, forest, etc. are a valuable divine deposit for the people of any society and the national wealth of that society, which not only should be tried to preserve and protect these national assets, but should By adopting principled, technical, and regenerative exploitation policies, it ...
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Water, soil, pasture, forest, etc. are a valuable divine deposit for the people of any society and the national wealth of that society, which not only should be tried to preserve and protect these national assets, but should By adopting principled, technical, and regenerative exploitation policies, it passed on these most precious sources of life to future generations. With the increasing power of technologies in the exploitation of natural resources, the environmental-environmental balance in recent centuries has been disturbed to the detriment of nature, which has created miserable and sometimes irreparable conditions and is referred to as the crisis of natural resources and the environment. It becomes. Today, the international community sees the solution to this dilemma as protecting the environment, and in doing so, wants to know how it can draw on religious teachings in this important matter. The mentioned research seeks to answer this question by descriptive-analytical method. The results show that in order to get rid of the current environmental crisis, we must refer to moral principles and religious texts, especially Islam, because the basis of the crisis in renewable natural resources is the moral crisis among humans and attention to the fundamental values of Islam. Due to its divine and moral support, it plays a key role in the sustainability and protection of the environment and renewable natural resources.
Mohammad Farzam; Yasamin Fazeli; mohammad Ghorbani
Abstract
Rangeland stockholders are traditionally using their rangeland for producing various livestock productions such as milk, wool and meet (Several Products, SP). However in recent years, meat production as the only product (Meat Production, MP) is implemented in some rangelands of Khorasan Razavi. We compared ...
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Rangeland stockholders are traditionally using their rangeland for producing various livestock productions such as milk, wool and meet (Several Products, SP). However in recent years, meat production as the only product (Meat Production, MP) is implemented in some rangelands of Khorasan Razavi. We compared effects of 7 years rangeland utilization methods (SP or MP) on the rangeland ecology and their economic benefits for the stockholders. By doing field visits, plant canopy cover, productivity, rangeland conditions and trends, and species diversity were measured and then calculated. Moreover, livestock weight, milk and meat productions, the time spent for livestock management, and 24 hours activities of animals in the rangelands were measured and compared between SP and MP methods. Results indicated similar species diversity and plant production for both MP and SP methods. Major differences were found in terms of incomes, total incomes was 17% higher but total expenses were 70% lower in MP method, leading to 24% higher net income. Moreover, rangers had to spend more time for preparing milk products and selling them in cities, by the MP method. In their daily activity, livestock spent hours more for walking and grazing, which had led to higher soil and vegetation deterioration in MP site. In future, higher income and easier livestock management may encourage stockholders towards higher implementation of MP method. Therefore, future studies should consider best MP method that leads to least side effects on the rangeland soil and vegetation.
elham fakhimi; Javad Motamedi; Zeinab Gholipour; Ezat allah Soleimani; Shahbaz Shamsoddini
Abstract
Knowledge of medicinal plants and economic evaluation of their use is one of the basic requirements for the preparation of multi-purpose rangeland plans. The aim of this study was to estimate the economic indicators of the use of medicinal plants used in Aliabad Mosiri summer rangeland, located in Koohrang ...
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Knowledge of medicinal plants and economic evaluation of their use is one of the basic requirements for the preparation of multi-purpose rangeland plans. The aim of this study was to estimate the economic indicators of the use of medicinal plants used in Aliabad Mosiri summer rangeland, located in Koohrang Bakhtiari. For this purpose, in the years 2018 to 2020, while sampling the vegetation and measuring the amount of organ production used by medicinal plants and the amount of forage of grazing species, economic indicators were calculated according to the collected data. According to the results, gross income from the use of medicinal plants includes; Shallots (Allium hirtifolium), Allium jesdianum, Allium ampeloprasu, Mentha longifolia and Thymus daenensis, in a harvest period, was estimated at 1139.463974 million Rials per hectare. From the deduction of overt and covert operating costs, the economic rent resulting from the sale of medicinal plants, 40,0342,242 million Rials per hectare per year was obtained. The expected value of each hectare of rangelands in the region from the place of exploitation of medicinal plants, taking into account the discount rate of 5.4 percent in September 2020, 71.74547 million Rials per hectare and from the place of forage for grazing livestock, 1.130050 million rials per hectare. It was estimated that the share of medicinal plants in the total expected value is 87%. .Also, the annual employment of medicinal plants in the 300-hectare area of distribution of medicinal plants, three people per year, was calculated
Elaheh Fahimipour; Jamshid Ghorbani; Ghodratollah Heydari
Abstract
Soil seed bank has an important role in vegetation restoration following cessation of disturbance. In this study, the soil seed bank richness and diversity were investigated in semi-steppic rangeland with a history of land conversion into cultivation in Charmahal-Bakhtiari province. Land-use changes ...
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Soil seed bank has an important role in vegetation restoration following cessation of disturbance. In this study, the soil seed bank richness and diversity were investigated in semi-steppic rangeland with a history of land conversion into cultivation in Charmahal-Bakhtiari province. Land-use changes were identified in grassland and shrubland and then were classified into four groups according to the time since abandonment including < 5, 5-15, 15-25 and > 25 years. Aspect was considered in each group. Soil was sampled and seed bank was identified using seedling germination method in glasshouse. Then, seed bank richness and diversity indices were calculated. Results showed that in seed bank the number of perrenilas was greater than annuals. In both grassland and shrubland time since abandonment significantly influenced the soil seed bank richness and diversity. In grassland soil seed bank richness and diversity decreased with time of abandonment but in area with more than 25 yrs of abandonment seed abnk richness and diversity significantly increased. Aspect significantly affected both seed bank richness and diversity in shrubland. North slpoe showed fluctuation in seed bank richness and diversity during abandonment while an increase was found in west slope and a reduction in south and east slopes. In both sites the soil seed bank indices significantly increased shortly after abandonment (<5 yrs) but seed bank richness and diversity showed resilient in >25 yrs in grassland and >15 yrs in shrubland.
Soheil Gheshlaghpour; Masoumeh Moghbel
Abstract
Rising temperatures and the formation of Urban Heat Islands (UHI) are the main consequences of population growth and uncontrolled expansion of cities. Green infrastructures are one of the nature based solutions. These infrastructures can be considered as an important strategy to reduce the damages caused ...
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Rising temperatures and the formation of Urban Heat Islands (UHI) are the main consequences of population growth and uncontrolled expansion of cities. Green infrastructures are one of the nature based solutions. These infrastructures can be considered as an important strategy to reduce the damages caused by urban development and increase the quality of citizens’s life. Landscape ecology and its metrics are among the methods of evaluating green infrastructure in urban environments. Hence, the main objective of this research is to evaluate changes in urban green infrastructure during the period of 2013-2019 in Qazvin city. To do so, green infrastructures changes were investigated using remote sensing data and landscape metrics including presence (Class Area), stability (Mean Patch Size) and distribution (Patch Density, Mean Euclidean Distance Neighbor) in three regions of Qazvin. The results showed a decrease of 73.71 hectares in the Class Area (presence) and an increase of 0.1061 hectares in their Mean Patch Size (stability). Furthermore, the density of green infrastructures has experienced 0.8075 decrease per 100 hectares while the Mean Euclidean distance neighbor has increased about 5.5846 meters. These results indicate the conversion of small classes of green infrastructures to bigger classes and increase their stability despite the decrease in their presence. Therefore, planning and management by creating and expansion of green lands seems necessary in order to reduce the effects of urban development, improve the quality of citizen’s life and preserving green infrastructures of Qazvin.
Hamid Reza Saeidi Goraghani; Hossein Arzani; Hossein Azarnivand; Mehdi Ghorbani
Abstract
People's attitudes toward influence of natural resource management projects on their livelihood could be playing a role important in the sustainability of these projects. This paper accomplished with general aim to studying the attitude of rancher towards the effects of range and watershed plans in sustainable ...
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People's attitudes toward influence of natural resource management projects on their livelihood could be playing a role important in the sustainability of these projects. This paper accomplished with general aim to studying the attitude of rancher towards the effects of range and watershed plans in sustainable livelihoods capitals tribal families in Sarduieh of Jiroft county. In this regard, five allotments selected that they were done range management and watershed plans. Sampling was simple Random method and the number of samples was determined by Krejcie and Morgan of 48 ranchers. Data were collected via focus groups and interviews structured questionnaire that its validity and reliability were achieved at an acceptable level. Forms and questionnaires analyzed after the initial review and verify the accuracy of the data. For processing and extraction of quantitative and qualitative data used from software SPSS18 and using statistical techniques appropriate with measurement level of variables. The findings show that there was a significant relationship between natural-ecological capital, human-technical, social and sustainable livelihoods of farmers. The results from multiple regression analysis showed that totally 83% of the variance of sustainable livelihoods is determined by third variable including natural capital, social capital and human capital and technical. Also, the findings of this study showed that the highest standard regression coefficient was related to index of natural capital and ecological indicators.
