Pub Date : 2020-11-21DOI: 10.22034/JEST.2021.27538.3660
Mona Zelli Booriabadi, S. A. Hoseini, S. Hedayati, A. Adeli, H. Rezaei
Background: Zinc is an abundant element in the Earth's crust at approximately 0.04 grams to kilograms. The Zinc sulfide is found mostly in nature. The deposition of Zinc absorption by the amount of soluble in aqueous solutions decreases. In this study, the removal of Zinc was investigated by Scenedesmus algae. Methods: To determine the amount of Zinc absorbed by the absorbent Scenedesmus concentrations of pollutants under different conditions, adsorbent dose, contact time, pH back and the remaining amount was measured by atomic absorption. Adsorption isotherms and kinetic modeling of metal ions on the adsorbent based on the model of Langmuir, Freundlich and kinetics were determined pseudo-first and pseudo-second. Results: absorption and adsorption kinetics by Langmuir and Freundlich isotherm models by the model described by pseudo first order and pseudo-second. The results showed that the correlation coefficient, absorption kinetics of pseudo-second-order model with an amount equal to 1 and the balance by the amount of 0.7926 were described by Freundlich isotherm. Conclusion: This study showed absorption process due to the high correlation algae Scenedesmus sp feature is the removal of Zinc And can be to used proposed as appropriate for the removal of the wastewater.
{"title":"Study on isotherm and kinetic for the adsorption of heavy metal Zinc from aqueous solution by Scenedesmus micro-algae","authors":"Mona Zelli Booriabadi, S. A. Hoseini, S. Hedayati, A. Adeli, H. Rezaei","doi":"10.22034/JEST.2021.27538.3660","DOIUrl":"https://doi.org/10.22034/JEST.2021.27538.3660","url":null,"abstract":"Background: Zinc is an abundant element in the Earth's crust at approximately 0.04 grams to kilograms. The Zinc sulfide is found mostly in nature. The deposition of Zinc absorption by the amount of soluble in aqueous solutions decreases. In this study, the removal of Zinc was investigated by Scenedesmus algae. \u0000Methods: To determine the amount of Zinc absorbed by the absorbent Scenedesmus concentrations of pollutants under different conditions, adsorbent dose, contact time, pH back and the remaining amount was measured by atomic absorption. Adsorption isotherms and kinetic modeling of metal ions on the adsorbent based on the model of Langmuir, Freundlich and kinetics were determined pseudo-first and pseudo-second. \u0000Results: absorption and adsorption kinetics by Langmuir and Freundlich isotherm models by the model described by pseudo first order and pseudo-second. The results showed that the correlation coefficient, absorption kinetics of pseudo-second-order model with an amount equal to 1 and the balance by the amount of 0.7926 were described by Freundlich isotherm. \u0000Conclusion: This study showed absorption process due to the high correlation algae Scenedesmus sp feature is the removal of Zinc And can be to used proposed as appropriate for the removal of the wastewater.","PeriodicalId":15762,"journal":{"name":"Journal of Environmental Science and Technology","volume":"9 1","pages":"59-71"},"PeriodicalIF":0.0,"publicationDate":"2020-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75213546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Background and Objective: Land use surveys and review of environmental changes are one of the most important aspects of environmental management for future planning. Method: After image processing by using ERDAS software Landsat images (TM, ETM+) and Aster image (taken in 1989, 2000 and in 2011(in order to demonstrates Anzali land use changes during 3 decades, each image was classified separately, in six classes of land uses/covers: 1- built-up areas, 2- agricultural, 3- barren, 4- forest, 5- wetland, and 6- water bodies and then, the primary land use map was extracted for each image. Having finished the image classification stage, accuracy of classification was determined and area coverage for all six types of land use within the Anzali were calculated over three decades. Findings: The results predicted a declining trend of 10.64% in forest, 8.52% in Anzali wetland and 11.54% in barren land during1989 to 2011, and also an increasing trend of 7.1% in urban areas for a time span 1989-2021. Major expansions in urban areas were witnessed around western and eastern borders of the city, particularly close to the eastern border. Scattered expansions were also predicted in Anzali wetlands registered in Ramsar Convention (Southern borders). Discussion and Conclusion: This study provides an opportunity to define and apply better strategies for environmental management of land use in order to make an optimized balance between urban development and ecological protection of environmental resources.
{"title":"بررسی و تعیین روند سه دهه تغییرات کاربری اراضی شهرستان انزلی با استفاده از GIS/RS","authors":"Mahsa Adl, Alireza Gharagozlu, Jafar Nouri, Shahrzad Faryadi","doi":"10.22034/JEST.2021.39820.4468","DOIUrl":"https://doi.org/10.22034/JEST.2021.39820.4468","url":null,"abstract":"Background and Objective: Land use surveys and review of environmental changes are one of the most important aspects of environmental management for future planning. \u0000Method: After image processing by using ERDAS software Landsat images (TM, ETM+) and Aster image (taken in 1989, 2000 and in 2011(in order to demonstrates Anzali land use changes during 3 decades, each image was classified separately, in six classes of land uses/covers: 1- built-up areas, 2- agricultural, 3- barren, 4- forest, 5- wetland, and 6- water bodies and then, the primary land use map was extracted for each image. Having finished the image classification stage, accuracy of classification was determined and area coverage for all six types of land use within the Anzali were calculated over three decades. \u0000Findings: The results predicted a declining trend of 10.64% in forest, 8.52% in Anzali wetland and 11.54% in barren land during1989 to 2011, and also an increasing trend of 7.1% in urban areas for a time span 1989-2021. Major expansions in urban areas were witnessed around western and eastern borders of the city, particularly close to the eastern border. Scattered expansions were also predicted in Anzali wetlands registered in Ramsar Convention (Southern borders). \u0000Discussion and Conclusion: This study provides an opportunity to define and apply better strategies for environmental management of land use in order to make an optimized balance between urban development and ecological protection of environmental resources.","PeriodicalId":15762,"journal":{"name":"Journal of Environmental Science and Technology","volume":"6 1","pages":"167-177"},"PeriodicalIF":0.0,"publicationDate":"2020-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81535028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-21DOI: 10.22034/JEST.2021.2652.1211
H. Amirnejad, K. A. Solout, A. Zarandian
Background and Objective: Valuation of functions and Non-Market services of environment are important for many reasons such as identifying and understanding the environmental and ecological benefits by humans, presentation of environmental issues to decision makers and planners, providing link between economic policies and natural revenues and assess the role and importance of environmental resources in support of human welfare and sustainable development. Methods: In this study, recreational value of Bamou Park is estimated and measured with using two methods of contingent value and travel cost. For this purpose, 315 questionnaires from visitor to extract the required data have been matched. Findings: Based on estimated results, variables: inhabitance, distance from park, first visit, number of visit, Deontologist, education, travel cost, visitors income, museum existence, and existence of Animal species such as deer, wolf, wild ram and cinereous vulture is effective variable on willingness to pay of visitor in 2011. Results show that monthly expected willingness to pay of consequentialist and deontologist visitors is 51397 and 61028 Rial respectively. Finally, recreational value of Bamou Park estimated in 2 methods is 1.085 and 1.975 Billion Rial respectively in 2011. Discussion and Conclusion: Since that travel cost method used market price information and revealed willingness to pay and also 90.7 percentages of visitors are Zone inhabitance and travel cost function was ideal form econometrics theoretical aspect, preferred using travel cost method instead of contingent value method to valuating the Bamou National Park in 2011.
{"title":"Comparison of Contingent Valuation and Travel Cost Methods to Estimate Outdoor Recreation Value of Recreation, Tourism and Aesthetic Function of Bamou National Park","authors":"H. Amirnejad, K. A. Solout, A. Zarandian","doi":"10.22034/JEST.2021.2652.1211","DOIUrl":"https://doi.org/10.22034/JEST.2021.2652.1211","url":null,"abstract":"Background and Objective: Valuation of functions and Non-Market services of environment are important for many reasons such as identifying and understanding the environmental and ecological benefits by humans, presentation of environmental issues to decision makers and planners, providing link between economic policies and natural revenues and assess the role and importance of environmental resources in support of human welfare and sustainable development. \u0000Methods: In this study, recreational value of Bamou Park is estimated and measured with using two methods of contingent value and travel cost. For this purpose, 315 questionnaires from visitor to extract the required data have been matched. \u0000Findings: Based on estimated results, variables: inhabitance, distance from park, first visit, number of visit, Deontologist, education, travel cost, visitors income, museum existence, and existence of Animal species such as deer, wolf, wild ram and cinereous vulture is effective variable on willingness to pay of visitor in 2011. Results show that monthly expected willingness to pay of consequentialist and deontologist visitors is 51397 and 61028 Rial respectively. Finally, recreational value of Bamou Park estimated in 2 methods is 1.085 and 1.975 Billion Rial respectively in 2011. \u0000Discussion and Conclusion: Since that travel cost method used market price information and revealed willingness to pay and also 90.7 percentages of visitors are Zone inhabitance and travel cost function was ideal form econometrics theoretical aspect, preferred using travel cost method instead of contingent value method to valuating the Bamou National Park in 2011.","PeriodicalId":15762,"journal":{"name":"Journal of Environmental Science and Technology","volume":"19 1","pages":"73-85"},"PeriodicalIF":0.0,"publicationDate":"2020-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76760085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-21DOI: 10.22034/JEST.2021.21834.3089
D. Amini, M. Tavakoli, M. Faramarzi
Background and Objective: The purpose of this study is to investigate the relationship between trend of soil salinity, land use and climatic factors in the region of Shadegan, Khuzestan. Method: In this study, using principal component analysis and 54 samples of soil, soil salinity maps were prepared for the years 1990, 2006 and 2015. In the next step, land use maps of the region for the mentioned years have been prepared using satellite images and trend changes are determined. On the other hand, changes in climatic factors (temperature and precipitation) for the period of 1990-2015 were evaluated. Findings: Results showed that, reducing precipitation and increasing temperature caused increasing soil salinity during 25 years and also agricultural land and irrigation by saline water increases the salinity of the soil. Discussion and conclusion: Locating Hoor al-Azim wetland in the western part of the region, although it has fresh, brackish and saline water, it may have negative effects on soil salinity of the area because of using in agriculture irrigation. Finally, it can be concluded that soil salinity of the land might change land use and it can cause desertification in the region.
{"title":"Investigation of the Relationship Between Soil Salinity Trend, Land Use and Climatic Factors Change (Case Study: Shadegan, Khuzestan)","authors":"D. Amini, M. Tavakoli, M. Faramarzi","doi":"10.22034/JEST.2021.21834.3089","DOIUrl":"https://doi.org/10.22034/JEST.2021.21834.3089","url":null,"abstract":"Background and Objective: The purpose of this study is to investigate the relationship between trend of soil salinity, land use and climatic factors in the region of Shadegan, Khuzestan. \u0000Method: In this study, using principal component analysis and 54 samples of soil, soil salinity maps were prepared for the years 1990, 2006 and 2015. In the next step, land use maps of the region for the mentioned years have been prepared using satellite images and trend changes are determined. On the other hand, changes in climatic factors (temperature and precipitation) for the period of 1990-2015 were evaluated. \u0000Findings: Results showed that, reducing precipitation and increasing temperature caused increasing soil salinity during 25 years and also agricultural land and irrigation by saline water increases the salinity of the soil. \u0000Discussion and conclusion: Locating Hoor al-Azim wetland in the western part of the region, although it has fresh, brackish and saline water, it may have negative effects on soil salinity of the area because of using in agriculture irrigation. Finally, it can be concluded that soil salinity of the land might change land use and it can cause desertification in the region.","PeriodicalId":15762,"journal":{"name":"Journal of Environmental Science and Technology","volume":"26 1","pages":"13-58"},"PeriodicalIF":0.0,"publicationDate":"2020-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78993577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-10-22DOI: 10.22034/JEST.2020.17578
Mansoureh Malhan, S. Hojati, N. Enayatizamir
Background and Objectives: Soil microbial properties such as biomass, microbial respiration and nitrogen mineralization can be used as indicators to show the stress caused by heavy metal pollution on soil quality. The aim of this study was the measurement soil microbial activity to evaluate the effect of soil Ni contamination on soil quality and determination of ecological dose 50 (ED50). Method: This study was conducted as a factorial experiment in year 2016 based on a randomized completely design with three replications. The experiment factors including Ni concentration in six levels (0, 50, 100, 150, 300 and 600 mg Ni kg-1) and two incubation times (15 and 60 days). Soils sample was spiked uniformly with different concentrations of NiCl2. Microbial respiration, microbial biomass carbon, heterotrophic population and metabolic quotient were measured after incubation times of 15 and 60 days, then according to the results, ED50 was determined by using the dose-response curve. Findings: Soil Nickel contamination on the indicator was significantly effective at P<0.01 level. Heterotrophic population, respiration and microbial carbon biomass decreased significantly (P<0.01) compared to control by increasing the Ni concentration and incubation times, whereas the increase of Ni concentration and incubation times were not significantly affected on metabolic quotient. The minimum amount of microbial respiration, microbial biomass carbon, and the heterotrophic population was observed at the end of incubation times and 600 mg Ni kg-1 with 77.07, 75.72 and 99.99% decrement compared to the control, respectively. ED50 value (mg/kg soil) of microbial respiration, microbial biomass carbon, and heterotroph population increased from 77.55, 78.63, 81.34 to 97.84, 111.04 and 84.67 respectively, with increased incubation time. Discussion and Conclusion: The soil contaminated with Nickel acutely decreased the biological activity of soil and the ecological dose increased with increasing the incubation time, suggesting that toxicity of Ni to soil microbial activity was decreased with increased incubation time. Ni concentration of 100 mgNikg-1 soil can be considered as the critical range of Ni for soil quality at which negative effect was observed.
背景与目的:土壤微生物特性如生物量、微生物呼吸和氮矿化可以作为重金属污染对土壤质量胁迫的指标。本研究的目的是测定土壤微生物活性，评价土壤镍污染对土壤质量的影响及测定生态剂量50 (ED50)。方法:本研究采用三重复随机完全设计，于2016年进行因子试验。实验因素包括6个浓度水平(0、50、100、150、300和600 mg Ni kg-1)和2个孵育时间(15和60 d)。在土壤样品中均匀地加入不同浓度的NiCl2。培养15和60 d后测定微生物呼吸、微生物生物量碳、异养种群和代谢商，并根据结果采用量效曲线测定ED50。结果:土壤镍污染对该指标有极显著影响，P<0.01水平。增加Ni浓度和孵育次数显著降低了异养种群、呼吸和微生物碳量(P<0.01)，而增加Ni浓度和孵育次数对代谢商无显著影响。微生物呼吸量、微生物生物量碳和异养种群在孵育结束和600 mg Ni kg-1时的最小值分别比对照减少77.07、75.72和99.99%。随着培养时间的延长，微生物呼吸、微生物生物量碳和异养菌群的ED50值(mg/kg土壤)分别从77.55、78.63、81.34增加到97.84、111.04和84.67。讨论与结论:镍污染土壤后，土壤生物活性急剧下降，生态剂量随孵育时间的延长而增加，说明镍对土壤微生物活性的毒性随孵育时间的延长而降低。100 mgNikg-1土壤的Ni浓度可视为土壤质量的Ni临界范围，超过该范围会产生负影响。
{"title":"Determination of ED50 in a Calcareous Soil Contaminated with Different Concentrations of Ni","authors":"Mansoureh Malhan, S. Hojati, N. Enayatizamir","doi":"10.22034/JEST.2020.17578","DOIUrl":"https://doi.org/10.22034/JEST.2020.17578","url":null,"abstract":"Background and Objectives: Soil microbial properties such as biomass, microbial respiration and nitrogen mineralization can be used as indicators to show the stress caused by heavy metal pollution on soil quality. The aim of this study was the measurement soil microbial activity to evaluate the effect of soil Ni contamination on soil quality and determination of ecological dose 50 (ED50). \u0000Method: This study was conducted as a factorial experiment in year 2016 based on a randomized completely design with three replications. The experiment factors including Ni concentration in six levels (0, 50, 100, 150, 300 and 600 mg Ni kg-1) and two incubation times (15 and 60 days). Soils sample was spiked uniformly with different concentrations of NiCl2. Microbial respiration, microbial biomass carbon, heterotrophic population and metabolic quotient were measured after incubation times of 15 and 60 days, then according to the results, ED50 was determined by using the dose-response curve. \u0000Findings: Soil Nickel contamination on the indicator was significantly effective at P<0.01 level. Heterotrophic population, respiration and microbial carbon biomass decreased significantly (P<0.01) compared to control by increasing the Ni concentration and incubation times, whereas the increase of Ni concentration and incubation times were not significantly affected on metabolic quotient. The minimum amount of microbial respiration, microbial biomass carbon, and the heterotrophic population was observed at the end of incubation times and 600 mg Ni kg-1 with 77.07, 75.72 and 99.99% decrement compared to the control, respectively. ED50 value (mg/kg soil) of microbial respiration, microbial biomass carbon, and heterotroph population increased from 77.55, 78.63, 81.34 to 97.84, 111.04 and 84.67 respectively, with increased incubation time. \u0000Discussion and Conclusion: The soil contaminated with Nickel acutely decreased the biological activity of soil and the ecological dose increased with increasing the incubation time, suggesting that toxicity of Ni to soil microbial activity was decreased with increased incubation time. Ni concentration of 100 mgNikg-1 soil can be considered as the critical range of Ni for soil quality at which negative effect was observed.","PeriodicalId":15762,"journal":{"name":"Journal of Environmental Science and Technology","volume":"109 1","pages":"237-248"},"PeriodicalIF":0.0,"publicationDate":"2020-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88911258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
زمینه و هدف: شناخت آشیان اکولوژیکی گونههای مختلف در بسیار از مسائل اکولوژیکی ضروری است. آشیان اکولوژیک گونهها یکی از فاکتورهای مهم در تشخیص الگوی پراکنش درختان بوده و برای کل گونهها، با بررسی توزیع پراکنش گونهها قابلتشخیص است. مدلهای آشیان اکولوژیک اغلب به فهم بیشتر اکوسیستم کمک مینماید. این مدلها در پیشبینی برآورد تغییرات پایداری اکوسیستم و نسبت پایداری و اکوسیستمها کاربردی است. روش بررسی: به منظور تعیین فشار انتخابی گونههای مختلف از شاخصهای سطح تعادل آشیان انتخابی، سطح غالب آشیان انتخابی و سطح بحران آشیان انتخابی استفاده و 5/41 هکتار از جنگلآموزشی پژوهشی خیرود مورد آماربرداری کامل (صددرصد) قرار گرفت. سپس، مشخصهای نظیر قطر برابر سینه درختان اندازهگیری و با استفاده از شاخصهای آشیان انتخابی به اندازهگیری فشار انتخابی و سطوح آشیان گونههای راش، بلوط، ممرز، توسکا پرداخته شد. یافتهها: مقدار بدست آمده از فشار انتخابی برای گونههای راش 419/66 ، بلوط 313/28، ممرز 3/261، توسکا 962/36 و نمدار 39/9 به ترتیب محاسبه شد. نتایج نهایی بدست آمده نشان داد گونه ممرز در سطح آشیان غالب، گونه راش و توسکا در سطح آشیان تعادل، گونه بلوط در حد واسط آشیان تعادل و مغلوب و نمدار در سطح آشیان مغلوب بوده است. بحث و نتیجهگیری: گونه ممرز در سطح غالب فشار انتخابی، گونه نمدار در ردیف گونههای با سطح تعادل بحران و گونه بلوط در سطح آشیان بحران نزدیک به سطح تعادل قرار گرفت. نتایج بدست آمده از این پژوهش نشان داد که کمیسازی فشار انتخابی یک عامل مهم برای تعیین جایگاه کنونی گونههای در حال انقراض میباشد.
{"title":"کمیسازی فشار آشیان انتخابی گونههای چوبی در جنگلهای میانبند شمال ایران (منطقه مورد مطالعه: بخش گرازبن جنگل خیرود)","authors":"سجاد بابایی, محمود بیات, منوچهر نمیرانیان, سحر حیدری مستعلی, فاطمه احمدلو","doi":"10.22034/JEST.2020.47024.4807","DOIUrl":"https://doi.org/10.22034/JEST.2020.47024.4807","url":null,"abstract":"زمینه و هدف: شناخت آشیان اکولوژیکی گونههای مختلف در بسیار از مسائل اکولوژیکی ضروری است. آشیان اکولوژیک گونهها یکی از فاکتورهای مهم در تشخیص الگوی پراکنش درختان بوده و برای کل گونهها، با بررسی توزیع پراکنش گونهها قابلتشخیص است. مدلهای آشیان اکولوژیک اغلب به فهم بیشتر اکوسیستم کمک مینماید. این مدلها در پیشبینی برآورد تغییرات پایداری اکوسیستم و نسبت پایداری و اکوسیستمها کاربردی است. \u0000روش بررسی: به منظور تعیین فشار انتخابی گونههای مختلف از شاخصهای سطح تعادل آشیان انتخابی، سطح غالب آشیان انتخابی و سطح بحران آشیان انتخابی استفاده و 5/41 هکتار از جنگلآموزشی پژوهشی خیرود مورد آماربرداری کامل (صددرصد) قرار گرفت. سپس، مشخصهای نظیر قطر برابر سینه درختان اندازهگیری و با استفاده از شاخصهای آشیان انتخابی به اندازهگیری فشار انتخابی و سطوح آشیان گونههای راش، بلوط، ممرز، توسکا پرداخته شد. \u0000یافتهها: مقدار بدست آمده از فشار انتخابی برای گونههای راش 419/66 ، بلوط 313/28، ممرز 3/261، توسکا 962/36 و نمدار 39/9 به ترتیب محاسبه شد. نتایج نهایی بدست آمده نشان داد گونه ممرز در سطح آشیان غالب، گونه راش و توسکا در سطح آشیان تعادل، گونه بلوط در حد واسط آشیان تعادل و مغلوب و نمدار در سطح آشیان مغلوب بوده است. \u0000بحث و نتیجهگیری: گونه ممرز در سطح غالب فشار انتخابی، گونه نمدار در ردیف گونههای با سطح تعادل بحران و گونه بلوط در سطح آشیان بحران نزدیک به سطح تعادل قرار گرفت. نتایج بدست آمده از این پژوهش نشان داد که کمیسازی فشار انتخابی یک عامل مهم برای تعیین جایگاه کنونی گونههای در حال انقراض میباشد.","PeriodicalId":15762,"journal":{"name":"Journal of Environmental Science and Technology","volume":"1 1","pages":"183-196"},"PeriodicalIF":0.0,"publicationDate":"2020-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88283901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-09-22DOI: 10.22034/JEST.2019.41413.4526
محمد برزگر, هانیه نوذری
زمینه و هدف: فضای سبز در کاهش آلودگی صوتی موثر است. هدف از این تحقیق بررسی تاثیر گونه های درختی موجود در فضای سبز شهر آباده و نیز تاثیر ردیف های درختکاری شده و عرض کاشت در کاهش شدت صوت بوده است. مواد و روش ها: در این مطالعه چهار ایستگاه در دو منطقه در شهر آباده شامل بلوار شهید چمران و کنار گذر شمالی انتخاب و نمونه برداری در اسفند ماه 1396 در دو نوبت صبح و عصر با استفاده از دستگاه صداسنجCirrusمدل CR:303انجام شد و از هر ایستگاه 25 داده و در مجموع 400 داده ثبت گردید. یافته ها: نتایج مقایسه میانگین تراز شدت صوت اندازه گیری شده در دو منطقه مورد مطالعه در دو نوبت صبح و عصر با استاندارد ملی ایران نشان می دهد میانگین تراز شدت صوت در هر دو منطقه ازحد استاندارد بالاتر است؛ بنابراین با وجود فضای سبز، آلودگی صوتی در هر دو منطقه وجود دارد. نتایج مطالعه ترازهای شدت صوت در بلوار شهید چمران و کنار گذر شمالی در دو نوبت صبح و عصر نشان می دهد بین فاصله از منبع تولید صدا (فاصله از خیابان) و تعداد ردیف درخت کاشته شده و میانگین تراز شدت صوت هبستگی منفی وجود دارد واین بدین معناست که هرچه فاصله از خیابان وتعداد ردیف های درخت کاشته شده بیشتر باشد میزان کاهش صدا بیشتر خواهد بود. بحث و نتیجه گیری: بیشترین کاهش صدا در بلوار شهید چمران مربوط به فاصله 54 متری از لبه خیابان با 14ردیف کاشت با میانگین تراز شدت صوت به ترتیب برای صبح و عصر 04/65 و 96/60 دسی بل و در کنار گذر شمالی مربوط به فاصله 85 متری از لبه خیابان با 10 ردیف کاشت و وجود یک تپه با میانگین تراز شدت صوت به ترتیب برای صبح و عصر 04/65 و 08/64 دسی بل بود.
{"title":"بررسی تاثیر فاصله و عرض کاشت گونه های درختی فضای سبز شهر آباده در کنترل آلودگی صوتی","authors":"محمد برزگر, هانیه نوذری","doi":"10.22034/JEST.2019.41413.4526","DOIUrl":"https://doi.org/10.22034/JEST.2019.41413.4526","url":null,"abstract":"زمینه و هدف: فضای سبز در کاهش آلودگی صوتی موثر است. هدف از این تحقیق بررسی تاثیر گونه های درختی موجود در فضای سبز شهر آباده و نیز تاثیر ردیف های درختکاری شده و عرض کاشت در کاهش شدت صوت بوده است. \u0000مواد و روش ها: در این مطالعه چهار ایستگاه در دو منطقه در شهر آباده شامل بلوار شهید چمران و کنار گذر شمالی انتخاب و نمونه برداری در اسفند ماه 1396 در دو نوبت صبح و عصر با استفاده از دستگاه صداسنجCirrusمدل CR:303انجام شد و از هر ایستگاه 25 داده و در مجموع 400 داده ثبت گردید. \u0000یافته ها: نتایج مقایسه میانگین تراز شدت صوت اندازه گیری شده در دو منطقه مورد مطالعه در دو نوبت صبح و عصر با استاندارد ملی ایران نشان می دهد میانگین تراز شدت صوت در هر دو منطقه ازحد استاندارد بالاتر است؛ بنابراین با وجود فضای سبز، آلودگی صوتی در هر دو منطقه وجود دارد. نتایج مطالعه ترازهای شدت صوت در بلوار شهید چمران و کنار گذر شمالی در دو نوبت صبح و عصر نشان می دهد بین فاصله از منبع تولید صدا (فاصله از خیابان) و تعداد ردیف درخت کاشته شده و میانگین تراز شدت صوت هبستگی منفی وجود دارد واین بدین معناست که هرچه فاصله از خیابان وتعداد ردیف های درخت کاشته شده بیشتر باشد میزان کاهش صدا بیشتر خواهد بود. \u0000بحث و نتیجه گیری: بیشترین کاهش صدا در بلوار شهید چمران مربوط به فاصله 54 متری از لبه خیابان با 14ردیف کاشت با میانگین تراز شدت صوت به ترتیب برای صبح و عصر 04/65 و 96/60 دسی بل و در کنار گذر شمالی مربوط به فاصله 85 متری از لبه خیابان با 10 ردیف کاشت و وجود یک تپه با میانگین تراز شدت صوت به ترتیب برای صبح و عصر 04/65 و 08/64 دسی بل بود.","PeriodicalId":15762,"journal":{"name":"Journal of Environmental Science and Technology","volume":"62 1","pages":"275-286"},"PeriodicalIF":0.0,"publicationDate":"2020-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90951263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-15DOI: 10.3923/jest.2020.124.130
E. Wahyuni, I. Istiningsi, A. Suratman
{"title":"Use of Visible Light for Photo Degradation of Linear Alkyl-benzene Sulfonate in Laundry Wastewater over Ag-doped TiO2","authors":"E. Wahyuni, I. Istiningsi, A. Suratman","doi":"10.3923/jest.2020.124.130","DOIUrl":"https://doi.org/10.3923/jest.2020.124.130","url":null,"abstract":"","PeriodicalId":15762,"journal":{"name":"Journal of Environmental Science and Technology","volume":"16 1","pages":"124-130"},"PeriodicalIF":0.0,"publicationDate":"2020-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89343434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-15DOI: 10.3923/jest.2020.131.138
I. Kusrini, M. Samsudin, P. Broto, Suryati Kumorowula, Sri Supadmi, Agung Dwi Lakson
{"title":"Thyroid Dysfunction among School-Aged Children due to Chronically Excessive Iodine Groundwater, Central Java, Indonesia","authors":"I. Kusrini, M. Samsudin, P. Broto, Suryati Kumorowula, Sri Supadmi, Agung Dwi Lakson","doi":"10.3923/jest.2020.131.138","DOIUrl":"https://doi.org/10.3923/jest.2020.131.138","url":null,"abstract":"","PeriodicalId":15762,"journal":{"name":"Journal of Environmental Science and Technology","volume":"69 1","pages":"131-138"},"PeriodicalIF":0.0,"publicationDate":"2020-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89299855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-15DOI: 10.3923/jest.2020.118.123
Sally F. Abo El-Ezz, A. El-Ghamry, Mervat M. Abo-Elkhie, Mohamed E. El-Zoughib, Mohamed Eldessuky Abd El Azi
{"title":"Evaluation of Waste Ashes for Use in Agricultural Purposes","authors":"Sally F. Abo El-Ezz, A. El-Ghamry, Mervat M. Abo-Elkhie, Mohamed E. El-Zoughib, Mohamed Eldessuky Abd El Azi","doi":"10.3923/jest.2020.118.123","DOIUrl":"https://doi.org/10.3923/jest.2020.118.123","url":null,"abstract":"","PeriodicalId":15762,"journal":{"name":"Journal of Environmental Science and Technology","volume":"2007 1","pages":"118-123"},"PeriodicalIF":0.0,"publicationDate":"2020-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88961962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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