مجله پژوهش و فناوری محیط زیست
پیاپی 14 (پاییز و زمستان 1402)

Water is one of the problems of today's world and it is necessary to conserve it. Many parts of the world are facing drought conditions. The purpose of this research is to analyze new and different techniques in modern agriculture. In this regard, it has been tried to introduce new methods using super absorbents. With the advancement of science and technology, excellent polymer materials have been developed to retain water. In this article, water retention agents based on natural and synthetic polymers have been reviewed in the last 10 years. Finally, the synthesis of two types of natural and synthetic super absorbents using recycled materials is described. Hydroxyethyl cellulose has excellent characteristics of a superabsorbent such as being biodegradable, non-toxic, high water absorption, and is one of the derivatives of cellulose, which is used in water extraction, wastewater treatment, electrolytic membranes, pharmaceuticals, and pesticides. Alternative soil has many applications in agriculture. And its use can be expanded by combining with different polymers. This combination allows the formation of new biomaterials with improved properties and various applications. As a result of preparing a water retention agent with a practical perspective in agriculture, it not only enhances water absorption and water retention in the soil, but also is resistant to salinity and has mechanical strength, re usability and economic value. is. All these features are present in the introduced super absorbents.

Dye is the first known pollutant in industrial wastewater, and its small amount is very undesirable in water. Most of the dyes contain complex organic molecules and are harmful to aquatic life and humans due to the presence of metals, aromatics and other compounds in their structure. Removing or reducing the amount of this pollutant entering the environment is essential, and biological absorption is one of these methods. The main purpose of this research is to investigate the removal of blue reactive textile dye by spirulina microalgae. In the process of conducting the research, the effect of variables such as contact time, injected algae dose and wastewater concentration was investigated on the dye removal process and the amount of absorption of the samples was measured by a spectrophotometer and the number of experiments was determined by the design expert software via response surface method (RSM) and the analysis of variance (ANOVA) statistical tool was used to analyze the obtained results. Based on the obtained results, in the optimal conditions of the experiment, the best percentage of dye removal by spirulina microalgae was 100% in contact time of 30 minutes with a dose of 10 ml of injected algae into wastewater with a color concentration of 50 mg/L. Therefore, the use of microalgae, in addition to being an inexpensive and easy-to-operate method for color removal from colored wastewater such as textile wastewater, it will be of interest to researchers as an environmentally friendly method to remove hard degradable pollutants.

Mazandaran province has always been considered by tourists due to its high tourism potential. Therefore, in order to satisfy the people and tourists, urban development has been expanded there. In addition, the relative increase in population, the development of industries, the problem of solid waste and wastewater, habitat destruction, energy, transportation and agriculture demand have affected the environment of Mazandaran. On the other hand, it has a high rate of vegetation degradation. Monitoring of land use and land cover changes play an important role in urban planning and landscape management. The main purpose of this study is to investigate the changes of Mazandaran province landscape using the time series of satellite data from 1988 to 2018 in order to plan for better management to protect the landscape and control development and destruction. In this study, urban development and vegetation changes of Mazandaran province were studied using Landsat satellite images by Change Vector Analysis method in each city over a period of 30 years. The results showed that the rate of urban development and vegetation degradation change in the study period is increasing in the province. The high rate of urban development changes in terms of percentage of area is related to the cities of Babolsar, Nowshahr and Chalous, includes 21, 15 and 11% of their total area, respectively. These three cities have the highest number of tourists per year and the highest number of villas. The high rate of destruction of deforestation in terms of area related to Sari, Neka and Behshahr, in the east of the province, includes 27, 11 and 7 hectares, respectively. The change vector analysis method has the ability to satisfactorily reveal and classify all types of changes in magnitude and direction in the landscape.

The residues of Moinfos and Ethion pesticides in 20 samples of apples and 12 samples of grapes, in two treatments, unwashed and washed, after extraction with a convenient, fast, effective, and safe analytical method (QuEChERS) were analyzed using gas chromatography and mass spectrometry (GC/MS). Also, the health risk assessment of pesticide residues in apple and grape samples was done using the hazard quotient (HQ) and based on the Monte Carlo simulation for two age groups of adults and children. The results showed that the average residue of ethion in unwashed apple and grape samples was lower than the maximum residue levels of the MRLs of Iran. While, the average residue of Moinphos in unwashed apple and grape samples was higher than the MRLs of Iran. Also, the pesticide residues of Ethion and Moinfos in 100% of the apple and grape samples were higher than the MRL of the European Union. After washing, the average residue of Moinfos and Ethion pesticides decreased by 47 and 45% in apple samples and 44 and 42% in grape samples, respectively. The results of risk assessment based on Monte Carlo simulation showed that the HQ value is less than one with 100% certainty in the age groups of children and adults. Therefore, the consumption of apples and grapes with these two pesticides does not pose any significant risk to the health of consumers. However, due to the use of numerous pesticides, continuous and accurate monitoring and strict regulations regarding the quality and safety of fruits are recommended.

The current research was conducted with the aim of analyzing the content of fifth grade books based on the level of attention to environmental components. Descriptive research method has been done qualitatively and quantitatively by content analysis method. The statistical society is the books of the fifth grade of the elementary school in the academic year 2023-2024. In these books, text, questions and pictures have been analyzed. In this study, 9 environmental components including water, air, climate, soil, sound, plants, animals, waste and pollution were investigated. According to the research findings, among the environmental components, attention has been paid 779 times to water, 145 times to air, 52 times to climate, 355 times to soil, 54 times to sound, 991 times to plants, 351 times to animals, 34 times to pollution and 8 times to waste. The plant component with a frequency of 991 is in the first rank and the waste component is in the last rank with a frequency of 8. The results show that paying special attention to a number of components and ignoring the others, causes disturbances in creating students' environmental knowledge and behavior. Also, the positive and negative effects of humans on the environment are not mentioned in these books. As citizens of the society and future makers, students should be aware of the result of their behavior and others with the environment so that they can take steps reducing the undesirable behavior and increasing favorable environmental behavior.

Tourism development is a key factor for economic growth in many countries. The Khorramabad-Isfahan corridor, as one of the important tourism corridors in Iran, has significant potential including waterfalls, dams, religious and historical attractions. However, it requires the development of tourism infrastructure to make optimal use of these capabilities. In this regard, the research aims to evaluate the role of tourism infrastructure in developing the Khorramabad-Isfahan tourism corridor. The study is an analytical research based on a survey method. Data collection is a mixed type. The theoretical information required was obtained through a documentary and library method. In the field method, due to the nature of the subject, field visits and questionnaires were used. The statistical population of the research consisted of 30 experts and specialists related to the research topic in the cities of Aligoudarz, Azna, and Doroud, who were selected based on purposive gradual sampling. AHP tool was used to analyze the data. The findings of the study showed that among the infrastructures affecting the Khorramabad-Isfahan tourism corridor, the components of physical access to tourist attractions, roadside parking, accommodation facilities (hotels, guesthouses), catering services (restaurants, teahouses, etc.), and the existence of information infrastructures are respectively more effective than other components on the development of tourism (existence of sports infrastructure, access to the internet, advertising, and attracting public and private investors) in this corridor.

One of the most important approaches to preserve and restore wetlands, is identifying environmental changes from past to present and developing an integrated management plan to control these changes and decision-making to provide solutions for improving the condition of these valuable ecosystems. Ovan Lake, as one of the beautiful and touristic landscapes in the forbidden hunting area of Eastern Qazvin, has distinct mountain habitats and various species of wildlife. By employing remote sensing techniques for a 30-year period, the process of changes and land use in the hydrological unit leading to Ovan Lake were identified and the trend of their changes was obtained quantitatively in this research. Then, the effect of the related hydromorphological indicators on the area and volume of the lake was investigated. The results showed that, according to the Modified Normalized Difference Water Index (MNDWI), the average area of the lake water zone was 8.15 hectares over the past eight years and based on univariate regressions, its hydrological regime is mainly related to two important factors of precipitation and evaporation. According to the univariate regressions demonstrate a significant relationship between the lake's hydrological regime and precipitation/evaporation rates. The evaporation parameter also showed a logical trend during the statistical years, so that the area and volume of the water zone of the lake has decreased by the increase of evaporation from the free surface of the water. Also, the results of multivariate regression between lake water volume and rainfall and evaporation components showed that the lake volume is more correlated with rainfall. But in contrast, evaporation changes with a greater slope or rate.

Cadmium is a toxic metal that has significantly increased its entry into the soil and food chain with the rise of environmental pollution. In this study, 11 grapevine cultivars (Vitis vinifera L.) were exposed to three levels of cadmium (0, 50, and 100 milligrams per kilogram) in a factorial experimental design based on a completely randomized design in the research greenhouse of Malayer University. After applying the different cadmium treatments over a period of approximately 4 months, leaf and rhizosphere soil samples of different grapevine cultivars were collected, and the concentrations of cadmium and zinc were measured using an atomic absorption spectrometer. Significant differences were observed among grapevine cultivars in terms of cadmium and zinc content in leaves and rhizosphere soil. The cultivar "Bidaneh Sefid" had the lowest cadmium content in leaves, while the highest cadmium content in rhizosphere soil was observed in the cultivar "Rish Baba." Moreover, the cultivar "Turkmen 4" had the highest zinc content in leaves, and the cultivar "Rish Baba" had the highest zinc content in rhizosphere soil. Geochemical indices including Igeo, Ipoll, CF, and BAC were evaluated in the surface soil compared to the standard shell and earthworm. Based on the results of this study, in the examination of soil indices in different grapevine cultivars and the impact of different cultivars, according to the Ipoll and Igeo (Müller) indices in the shell, in non-stressed soil without cadmium, it was considered slightly contaminated, and according to the standard shell in the earthworm, it was considered quantitatively contaminated. According to the Igeo index in the shell, in soil under 50 milligrams per kilogram of cadmium stress, it was considered slightly contaminated, and according to the Ipoll index, it was considered slightly to moderately contaminated, and according to the standard shell in the earthworm, it was considered heavily contaminated. According to the Igeo and Ipoll indices in the shell, the results of soil under 100 milligrams per kilogram of cadmium stress, were considered heavily contaminated, and according to the standard shell in the earthworm, it was considered severely contaminated. The results of these indices indicated that zinc was in the non-contaminated category.

Awareness of changes process, as well as the proper management of land use in natural ecosystems, is of great importance in conservation natural resources. In this regard, the use of remote sensing has become a common approach due to the provision an extent spatial and temporal information. In this research, in order to land use mapping, first, the accuracy of three common methods of pixel-based (maximum likelihood), machine learning (support vector machine) and object-oriented methods were compared. Then, the spatial and temporal changes of land use in a period of 26 years (1997-2023) assessed using six Landsat satellite imagery. The accuracy of image classification methods was evaluated using Kappa coefficient and overall accuracy indices and the change trend was evaluated using crosstab and spatial evaluation methods. Based on the results, the support vector machine method had the highest kappa coefficient (0.71 to 0.98) and overall accuracy (86 to 99%) for all studied courses. According to the results, poor rangeland had a decreasing trend, and the land uses of very poor rangeland, bare soil, and rainfed agriculture had increasing trends. The area of poor rangeland decreased from 962 hectares (44.36%) in 1997 to 489 hectares (22.57%) in 2023, while very poor rangeland increased from 1138 hectares (52.48%) to 1606 hectares (74.05 percent) in the same period. The results of this research indicated that the trend of land use changes in Jayransoo rangeland is towards the destruction of rangelands and with the passage of time this trend is intensifying. Also, based on the results obtained from this research, it is suggested to use machine learning based classification method to prepare land use mapping in future research.

Considering the adverse effects of chemical fertilizers on the environment, to evaluate the effect of different amounts of nitrogen fertilizer and manure on agronomic traits and essential oil content of Fennel, an experiment was conducted in Guilan Agricultural Research Center. In this experiment, pure nitrogen fertilizer was used at four levels of 0, 60, 120, and 180 kg ha-1and the manure was used at four levels of 0, 6, 12, and 18 tonsha-1. The results showed that the highest plant height, number of seeds per umbrella, and biological yield related to combined treatment were 180 kg of nitrogen with 18 tons of manure per hectare. Maximum number of umbrellas per plant, seed weight per plant, 1000 seed weight, and grain yield were obtained using 120 kg of pure nitrogen with 18 tons of manure, with the highest grain yield of 950.43 kg ha-1and minimum in control treatment was obtained in the amount of 655.4 kg ha-1. Highest percentage of essential oil and essential oil yield with the application of 60 kg of pure nitrogen with 18 tons of manure was obtained 1.946 % and 17.15 kg ha-1 respectively. According to the results, it seems that the application of manure can be an appropriate alternative to reduce the use of nitrogen fertilizer in the cultivation of fennel. The result showed that it is possible to reduce the use of chemical fertilizers by using animal manures and at the same time achieve optimal efficiency and reduce the adverse effects of chemical fertilizers.

Wetlands are one of the most prominent ecosystems in the world. These vital and diverse habitats are among life-giving systems that have no alternative. However, none of the world's ecosystems have experienced human-centered injuries and damages as much as wetlands. One of the main threats to Gilan wetlands are human factors such as urban, domestic and industrial wastewater, overfishing and converting wetland marginal lands into agricultural lands. In this study, RGB images were used to assess the water quality parameters of Anzali wetland (Beheshti Island Station) and the related data were compared to the values obtained from the TSS measurement. Based on the obtained data, the intensity of red color (R) in the macroscopic images (with the naked eye) from the wetland can be an environmental indicator to measure TSS concentration. The results of RGB analysis for red color with a correlation coefficient of 0.8513, for green color (G) with a correlation coefficient of 0.832 and for blue color (B) with a correlation coefficient of 0.663 were obtained. Finally, a correlation coefficient (R2=0/8035) between the decrease of RGB values and the increase of TSS concentration was obtained. Other parameters such as pH and Secchi Depth test were also measured in this study.

Tanodar wetland with an area of 1000 hectares is one of the largest wetlands in Lorestan province, which is located 10 km northwest of Dorud city. In this study to investigate the biodiversity of wintering birds in Tanodar wetland in 2017-2020 from species diversity indices (Shannon-Wiener and Simpson photo), species uniformity ( Smith-Wilson and Simpson dominance indices were used. During the study period 41 species of birds were recorded in Tanodar wetland, which belong to 10 orders, 13 families of birds in Iran. The results of biodiversity indices of birds in Tanodar wetland showed that in 2020 the highest species diversity, and 2017 had the highest uniformity of bird species. The trend of biodiversity indicators in Tanodar wetland is sinusoidal. The species of social gypsy rooster (Vanellus gregarius), which is in the highest conservation category (CR), was observed and recorded in this wetland in 2019 with 400 individuals as winter crossing migrants. In terms of bird survival in Tanodar wetland, 53.65 Percent were wintering birds, 29.26 Percent were migratory birds, and 17.09 Percent were normal (four seasons).