Pub Date : 2020-06-01DOI: 10.22059/JDESERT.2020.78160
M. Esfandiari, Hamid Sodaiezadeh, H. Ardakani
Dust storm is one of the criteria for air pollution, and pollution by Heavy Metal(HM) is one of the major environmental problems in the world. The objective of the present study was to assess some of HMs concentrations in the leaves and bark of cypress and atmospheric falling dust along the Yazd highway, Yazd Province, Iran. The total concentrations of cadmium (Cd), cobalt (Co), copper (Cu), nickle (Ni), lead (Pb), zinc (Zn), iron (Fe) and manganese (Mn) in the dust and plant samples were measured using atomic absorption spectrophotometry after digestion with acid. The results showed that the concentration of Zn and Cd metals in falling dust were the highest to the lowest, respectively. The distance from the highway significantly influenced the concentration of HMs in leaves and bark of the cypress tree. Moreover, the effect of HMs on the bark of this tree was higher than that of leaves, except for Cd, Co, Cu and Mn. Concentrations of Zn, Co, Ni and Fe increased with the increase in the distance from the highway due to multi-directional winds and the presence of other contaminants. The Pearson correlation analysis between the HMs found in the falling dust and Thuja orientalis L. showed that the input and controlling factors of these metals in the cypress tree were probably the same as the dust. The results further showed that the Thuja orientalis L. leaves with a metal accumulation index of 1973.16 mg/kg were more able to simultaneously absorb different metals. Therefore, since this green belt surrounds the Yazd urban area, it is expected that a significant amount of HMs will be absorbed by these trees.
{"title":"Assessment of heavy metals in Cypress (Thuja orientalis L.) in the Yazd Highway green belt","authors":"M. Esfandiari, Hamid Sodaiezadeh, H. Ardakani","doi":"10.22059/JDESERT.2020.78160","DOIUrl":"https://doi.org/10.22059/JDESERT.2020.78160","url":null,"abstract":"Dust storm is one of the criteria for air pollution, and pollution by Heavy Metal(HM) is one of the major environmental problems in the world. The objective of the present study was to assess some of HMs concentrations in the leaves and bark of cypress and atmospheric falling dust along the Yazd highway, Yazd Province, Iran. The total concentrations of cadmium (Cd), cobalt (Co), copper (Cu), nickle (Ni), lead (Pb), zinc (Zn), iron (Fe) and manganese (Mn) in the dust and plant samples were measured using atomic absorption spectrophotometry after digestion with acid. The results showed that the concentration of Zn and Cd metals in falling dust were the highest to the lowest, respectively. The distance from the highway significantly influenced the concentration of HMs in leaves and bark of the cypress tree. Moreover, the effect of HMs on the bark of this tree was higher than that of leaves, except for Cd, Co, Cu and Mn. Concentrations of Zn, Co, Ni and Fe increased with the increase in the distance from the highway due to multi-directional winds and the presence of other contaminants. The Pearson correlation analysis between the HMs found in the falling dust and Thuja orientalis L. showed that the input and controlling factors of these metals in the cypress tree were probably the same as the dust. The results further showed that the Thuja orientalis L. leaves with a metal accumulation index of 1973.16 mg/kg were more able to simultaneously absorb different metals. Therefore, since this green belt surrounds the Yazd urban area, it is expected that a significant amount of HMs will be absorbed by these trees.","PeriodicalId":11118,"journal":{"name":"Desert","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41893971","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 : 2020-06-01DOI: 10.22059/JDESERT.2020.78170
Anahita Rashtian, N. Monemi, S. Jafari, Hamid Reza Azimzadeh
Environmental contaminations resulting from mining operations play an important role in the collapse of ecosystems balance. In order to measure vegetation characteristics and to study soil and plant contamination in rangelands surrounding bauxite mine, a systematic random sampling was done according to physiognomy and homogeneity of vegetation cover. Sampling was performed using a 50-meter transect in three areas including near the mine (0-200 m), medium distance from the mine (200 to 500 m) and long distance from the mine (500 to 1000 m). Soil sampling sites were systematically selected from the middle of transects. In each region, three samples of the aerial parts and leaveswere randomly taken from Zygophyllum eurypterum plant with three replications. Then the concentration of heavy metals in soil and plant samples was evaluated using X-ray Fluorescence Spectroscopy, S4-Explorer model. The results showed that the highest and lowest metals concentrations in all soil and plant samples were obtained at a distance of 200 and 1500 meters from the mine, respectively. The overall evaluation results based on the integrated pollution index and mean of pollution degree showed that the pollution potential of the study area is low to moderate. The findings also indicated that the soil surrounding the mine is contaminated with aluminum, titanium, antimony and iodine.
{"title":"The effect of bauxite mining on soil and dominant plant pollution in arid rangelands of Taft in Yazd Province","authors":"Anahita Rashtian, N. Monemi, S. Jafari, Hamid Reza Azimzadeh","doi":"10.22059/JDESERT.2020.78170","DOIUrl":"https://doi.org/10.22059/JDESERT.2020.78170","url":null,"abstract":"Environmental contaminations resulting from mining operations play an important role in the collapse of ecosystems balance. In order to measure vegetation characteristics and to study soil and plant contamination in rangelands surrounding bauxite mine, a systematic random sampling was done according to physiognomy and homogeneity of vegetation cover. Sampling was performed using a 50-meter transect in three areas including near the mine (0-200 m), medium distance from the mine (200 to 500 m) and long distance from the mine (500 to 1000 m). Soil sampling sites were systematically selected from the middle of transects. In each region, three samples of the aerial parts and leaveswere randomly taken from Zygophyllum eurypterum plant with three replications. Then the concentration of heavy metals in soil and plant samples was evaluated using X-ray Fluorescence Spectroscopy, S4-Explorer model. The results showed that the highest and lowest metals concentrations in all soil and plant samples were obtained at a distance of 200 and 1500 meters from the mine, respectively. The overall evaluation results based on the integrated pollution index and mean of pollution degree showed that the pollution potential of the study area is low to moderate. The findings also indicated that the soil surrounding the mine is contaminated with aluminum, titanium, antimony and iodine.","PeriodicalId":11118,"journal":{"name":"Desert","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45186431","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 : 2020-06-01DOI: 10.22059/JDESERT.2020.78162
F. Mirzaei, E. Fathi, M. Parsinejad, B. Motesharezadeh, P. Ahmadi
Using plants for the remediation of soils contaminated with heavy metals is an economical, cheap, and effective strategy. The goal of this research was to study the effect of sewage sludge and drought stress on the remediation of cadmium in soil, root uptake by corn plant. This study was carried out on corn in factorial design experiment based on completely randomized design with three replications in three soil pollution levels, namely B1(control soil), B2 (Cd with soil, 20 mg.kg-1), B3 (Cd with sewage sludge with soil treated, 20 mg.kg-1), and two different irrigation regimes, including A1 (full irrigation) and A2 (limited irrigation). The research included two irrigation treatments at two levels of irrigation: 100% of field capacity (A1) and deficit irrigation at 80% of field capacity (A2). The results showed that the soil treated with cadmium and sewage sludge decreased dry and fresh wet weight plant. Sewage sludge increased the amount of cadmium concentration in shoot almost 21% toward the soil treated with cadmium (soil without cadmium); however, it could not increase cadmium uptake due to the decrease in shoot and root dry matter. In limited irrigation, cadmium concentration in shoot and root was reduced by 46 and 16% toward control treatment, respectively. With increasing irrigation and in the soil treated with sewage sludge, the transfer factor of cadmium from root to shoot dry matter increased. The translocation factors were 0.65, 0.5, and 0.13 for sewage sludge contaminated treatments, cadmium-contaminated treatments, and control treatments, respectively. Based on the results, growing plants at an irrigation level of 100% offered nest advantages in terms of higher biomass and efficient Cd removal.
{"title":"Effects of full and limited irrigation and contaminated soil on cadmium uptake by corn","authors":"F. Mirzaei, E. Fathi, M. Parsinejad, B. Motesharezadeh, P. Ahmadi","doi":"10.22059/JDESERT.2020.78162","DOIUrl":"https://doi.org/10.22059/JDESERT.2020.78162","url":null,"abstract":"Using plants for the remediation of soils contaminated with heavy metals is an economical, cheap, and effective strategy. The goal of this research was to study the effect of sewage sludge and drought stress on the remediation of cadmium in soil, root uptake by corn plant. This study was carried out on corn in factorial design experiment based on completely randomized design with three replications in three soil pollution levels, namely B1(control soil), B2 (Cd with soil, 20 mg.kg-1), B3 (Cd with sewage sludge with soil treated, 20 mg.kg-1), and two different irrigation regimes, including A1 (full irrigation) and A2 (limited irrigation). The research included two irrigation treatments at two levels of irrigation: 100% of field capacity (A1) and deficit irrigation at 80% of field capacity (A2). The results showed that the soil treated with cadmium and sewage sludge decreased dry and fresh wet weight plant. Sewage sludge increased the amount of cadmium concentration in shoot almost 21% toward the soil treated with cadmium (soil without cadmium); however, it could not increase cadmium uptake due to the decrease in shoot and root dry matter. In limited irrigation, cadmium concentration in shoot and root was reduced by 46 and 16% toward control treatment, respectively. With increasing irrigation and in the soil treated with sewage sludge, the transfer factor of cadmium from root to shoot dry matter increased. The translocation factors were 0.65, 0.5, and 0.13 for sewage sludge contaminated treatments, cadmium-contaminated treatments, and control treatments, respectively. Based on the results, growing plants at an irrigation level of 100% offered nest advantages in terms of higher biomass and efficient Cd removal.","PeriodicalId":11118,"journal":{"name":"Desert","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41992061","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 : 2020-06-01DOI: 10.22059/JDESERT.2020.78163
B. Bahrambeygi, H. Moeinzadeh, S. K. Alavipanah
In this paper, we investigated two originated metamorphosed harzburgites of the metaperidotite complex from the northern part of the Gishaki area. Harzburgite rocks, as main ultramafic complexes of the studied area, were exposed in the scattered location of the area. Despite intensive alterations, harzburgitic units were discriminated using petrography and Raman spectroscopy studies of relict minerals. There are two meta-harzburgite types of regionally metamorphosed harzburgites (R-Hz) and thermal metamorphosed harzburgites (T-Hz) with different characteristics and antigorite types. Antigorite polymorphs, structurally discriminated using Raman spectroscopy, had certain specific chemical characteristics compared with other serpentine polymorphs in SiO2, MgO, and H2O contents presented as separated fields in scatter diagrams. Reviewed antigorites illustrated general differentiations in themselves, so that polymorphs hosted by T-Hz rocks could be considered as a group with typical thermal antigorite geochemical criteria such as lower H2O ( 0.4 wt. % due to Ni tendency to high temperature phases through the recrystallization process), high SiO2 (because of the high silica activity in the aureole), lower total octahedral cations (due to pressure reverse dependence), and higher FeO (due to high temperature and Fe2+ activity). The increase in Si and Fe2+ activities cause to lack of Tetrahedral and presence Octahedral Tschermak substitutions as temperature dependent phenomena in thermal antigorites. Diagrams of SiO2 versus calculated H2O, SiO2 versus total octahedral cation units, and FeO versus NiO clearly distinguished thermal antigorites from former usual antigorite polymorphs. Thermal antigorite in the Gishaki serpentinites could be considered as metamorphosed products related to metamorphic aureoles.
{"title":"Introduction of meta-harzburgites using thermal originated antigorites in the Gishaki Ophiolitic area, as a part of Iranian Alpine type Ophiolites.","authors":"B. Bahrambeygi, H. Moeinzadeh, S. K. Alavipanah","doi":"10.22059/JDESERT.2020.78163","DOIUrl":"https://doi.org/10.22059/JDESERT.2020.78163","url":null,"abstract":"In this paper, we investigated two originated metamorphosed harzburgites of the metaperidotite complex from the northern part of the Gishaki area. Harzburgite rocks, as main ultramafic complexes of the studied area, were exposed in the scattered location of the area. Despite intensive alterations, harzburgitic units were discriminated using petrography and Raman spectroscopy studies of relict minerals. There are two meta-harzburgite types of regionally metamorphosed harzburgites (R-Hz) and thermal metamorphosed harzburgites (T-Hz) with different characteristics and antigorite types. Antigorite polymorphs, structurally discriminated using Raman spectroscopy, had certain specific chemical characteristics compared with other serpentine polymorphs in SiO2, MgO, and H2O contents presented as separated fields in scatter diagrams. Reviewed antigorites illustrated general differentiations in themselves, so that polymorphs hosted by T-Hz rocks could be considered as a group with typical thermal antigorite geochemical criteria such as lower H2O ( 0.4 wt. % due to Ni tendency to high temperature phases through the recrystallization process), high SiO2 (because of the high silica activity in the aureole), lower total octahedral cations (due to pressure reverse dependence), and higher FeO (due to high temperature and Fe2+ activity). The increase in Si and Fe2+ activities cause to lack of Tetrahedral and presence Octahedral Tschermak substitutions as temperature dependent phenomena in thermal antigorites. Diagrams of SiO2 versus calculated H2O, SiO2 versus total octahedral cation units, and FeO versus NiO clearly distinguished thermal antigorites from former usual antigorite polymorphs. Thermal antigorite in the Gishaki serpentinites could be considered as metamorphosed products related to metamorphic aureoles.","PeriodicalId":11118,"journal":{"name":"Desert","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45327219","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 : 2020-06-01DOI: 10.22059/JDESERT.2020.78166
S. Javadi, G. Zehtabian, M. Jafary, H. Khosravi, A. Abolhasani
Compared to surface water, groundwater resources are the primary source of water supply in arid and semi-arid regions of Iran, hence the importance of the management of these resources . In this regard, we assessed the effects of landuse changes on the qualitative and quantitative status of groundwater resources in Eshtehard region, Iran. Through processing and analyzing the satellite images, the region was divided into six different land uses, namely agricultural lands, Haloxylon planted area, bareland, saline lands, rangelands, and urban areas; the maps pertaining to these land uses were then prepared. The ground water table fluctuation was assessed via the quantitative data of wells in the study area during 2000-2014. IDW interpolation method was employed to study the spatial variations of parameters, such as EC, Na, SAR, and TDS; afterwards, the maps related to the qualitative and quantitative changes in groundwater were prepared. The results showed that the rangelands, bare lands, and urban areas increased, and the agricultural lands decreased during the studied period. There was more reduction in groundwater table whereas water quality dropped. Generally, water quality was reduced from west to east, and there was more decrease in groundwater table from south to north. It could be deduced that human and natural factors, particularly over exploitation of groundwater, were the main reasons for these changes.
{"title":"Quantitative and qualitative analysis of groundwater affected by land use change","authors":"S. Javadi, G. Zehtabian, M. Jafary, H. Khosravi, A. Abolhasani","doi":"10.22059/JDESERT.2020.78166","DOIUrl":"https://doi.org/10.22059/JDESERT.2020.78166","url":null,"abstract":"Compared to surface water, groundwater resources are the primary source of water supply in arid and semi-arid regions of Iran, hence the importance of the management of these resources . In this regard, we assessed the effects of landuse changes on the qualitative and quantitative status of groundwater resources in Eshtehard region, Iran. Through processing and analyzing the satellite images, the region was divided into six different land uses, namely agricultural lands, Haloxylon planted area, bareland, saline lands, rangelands, and urban areas; the maps pertaining to these land uses were then prepared. The ground water table fluctuation was assessed via the quantitative data of wells in the study area during 2000-2014. IDW interpolation method was employed to study the spatial variations of parameters, such as EC, Na, SAR, and TDS; afterwards, the maps related to the qualitative and quantitative changes in groundwater were prepared. The results showed that the rangelands, bare lands, and urban areas increased, and the agricultural lands decreased during the studied period. There was more reduction in groundwater table whereas water quality dropped. Generally, water quality was reduced from west to east, and there was more decrease in groundwater table from south to north. It could be deduced that human and natural factors, particularly over exploitation of groundwater, were the main reasons for these changes.","PeriodicalId":11118,"journal":{"name":"Desert","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47012119","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 : 2020-06-01DOI: 10.22059/JDESERT.2020.78171
M. Jozay, F. Kazemi, A. Fotovat
Application of green walls still has not attracted interest among the contractors and people, and this can be due to poor growing performance of the plants on these systems. This study investigated the effect of four growing media types (30% cocopeat + 65% perlite + 5% vermicompost, 30% soil + 65% perlite + 5% vermicompost, 30% mushroom compost + 65% perlite + 5% vermicompost and regular soil as the control) on the performance of three plant species (Frankenia thymfolia, Vinca minor, and Potentilla sp.) on green walls under arid climate of Mashhad city in Iran. In the control growing medium with no organic matter, Frankenia maintained the highest moisture and the lowest temperature compared to the other growing media types. The growing media did not affect the root and shoot fresh and dry weight and leaf relative water content of the Frankenia. Vinca minor in the cocopeat and mushroom compost produced the highest root fresh and dry weight; however, changing to the growing media types enriched with organic matter content did not affect the shoots fresh and dry weight of this plant type. The growing media containing organic matters compared to the control growing medium, improved relative water content of the Potentilla leaves. The growing media containing organic matters, especially mushroom compost, had positive effects on improving the growth performance of the green walls, through maintaining the moisture content of the media, and thus the relative water content of the leaves, which enhanced vitality of the plants.
{"title":"Evaluating the environmental performance of the growing media in a green wall system in a dry climate region","authors":"M. Jozay, F. Kazemi, A. Fotovat","doi":"10.22059/JDESERT.2020.78171","DOIUrl":"https://doi.org/10.22059/JDESERT.2020.78171","url":null,"abstract":"Application of green walls still has not attracted interest among the contractors and people, and this can be due to poor growing performance of the plants on these systems. This study investigated the effect of four growing media types (30% cocopeat + 65% perlite + 5% vermicompost, 30% soil + 65% perlite + 5% vermicompost, 30% mushroom compost + 65% perlite + 5% vermicompost and regular soil as the control) on the performance of three plant species (Frankenia thymfolia, Vinca minor, and Potentilla sp.) on green walls under arid climate of Mashhad city in Iran. In the control growing medium with no organic matter, Frankenia maintained the highest moisture and the lowest temperature compared to the other growing media types. The growing media did not affect the root and shoot fresh and dry weight and leaf relative water content of the Frankenia. Vinca minor in the cocopeat and mushroom compost produced the highest root fresh and dry weight; however, changing to the growing media types enriched with organic matter content did not affect the shoots fresh and dry weight of this plant type. The growing media containing organic matters compared to the control growing medium, improved relative water content of the Potentilla leaves. The growing media containing organic matters, especially mushroom compost, had positive effects on improving the growth performance of the green walls, through maintaining the moisture content of the media, and thus the relative water content of the leaves, which enhanced vitality of the plants.","PeriodicalId":11118,"journal":{"name":"Desert","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47714616","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 : 2020-06-01DOI: 10.22059/JDESERT.2020.78158
A. Mohebby
Homand Absard Rangeland Research Station is located 70 km northeast of tehran and 15 km southeast of Damavand with an altitude of 1972 m a.s.l., an average annual rainfall of 333 mm, and a cold semi-steppe climate. In order to compare the seed production of Vicia villosa under different cultivation seasons and methods, the seeds were initially collected from natural habitats similar to the mentioned station. Afterwards, seed characteristics such as viability, and seed vigorwere examined. Two sowing methods, namely row seeding and seeding with rainfall storage, through crescent contour trenches and spring and autumn sowing dates, were considered in a complete randomized block design with three replications. Statistical analysis was performed by independent t-test using SPSS 21 software. According to the obtained results, no establishment was recorded for spring sowing; furthermore, in autumn sowing, the two cultivation methods were not significantly different in terms of establishment (p <0.05). However, the results of mean comparisons showed that in autumn sowing, the crescent seeding with an average seed production of 68.36% was superior to the row seeding with an average seed production of 59.12%.
{"title":"Comparison of Vicia villosa establishment under different cultivation seasons and methods in the Homand Absard Research Station","authors":"A. Mohebby","doi":"10.22059/JDESERT.2020.78158","DOIUrl":"https://doi.org/10.22059/JDESERT.2020.78158","url":null,"abstract":"Homand Absard Rangeland Research Station is located 70 km northeast of tehran and 15 km southeast of Damavand with an altitude of 1972 m a.s.l., an average annual rainfall of 333 mm, and a cold semi-steppe climate. In order to compare the seed production of Vicia villosa under different cultivation seasons and methods, the seeds were initially collected from natural habitats similar to the mentioned station. Afterwards, seed characteristics such as viability, and seed vigorwere examined. Two sowing methods, namely row seeding and seeding with rainfall storage, through crescent contour trenches and spring and autumn sowing dates, were considered in a complete randomized block design with three replications. Statistical analysis was performed by independent t-test using SPSS 21 software. According to the obtained results, no establishment was recorded for spring sowing; furthermore, in autumn sowing, the two cultivation methods were not significantly different in terms of establishment (p <0.05). However, the results of mean comparisons showed that in autumn sowing, the crescent seeding with an average seed production of 68.36% was superior to the row seeding with an average seed production of 59.12%.","PeriodicalId":11118,"journal":{"name":"Desert","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45867919","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 : 2020-06-01DOI: 10.22059/JDESERT.2020.78161
S. Saadat, F. Dehghany, H. Rezaei, L. Esmaeelnejad, P. Maleki
Phosphorus (P) is a key element in many biological processes of plants and animals. We aimed to investigate the effect of different salinity levels and Ca:Mg ratios of irrigation water arid lands on soil available P, soluble P, and P absorbed by the pistachio plant. For this purpose, a greenhouse experiment was conducted by sowing the seeds of pistachio in a factorial randomized block design with four soil salinity levels (S1 (6 dS.m-1irrigation water salinity, leaching fraction (LF) = 50), S2, S3, and S4 (9 dS.m-1 irrigation water salinity, LF = 50, 30 and 20, respectively)) and three Ca:Mg ratios (M1, M2, and M3 equal to 1, 0.5, and 0.25, respectively). After harvesting the plants, the amount of soil available P (Po), water-soluble P (Pw), and total P (Pt) at soil depths of 0-5, 5-25, 25-50, and 50-75 cm, and P concentration in the leaves of Pistachio seedlings were measured.The results showed that the salinity of soil saturated extract had no significant effect on Po, Pw, and Pt. The reduction in Ca:Mg ratio increased Po and Pw in soil surface but it did not affect Pt. Increasing salinity from S1 to S2 augmented plant P uptake but at higher salinity levels, P uptake was reduced. The decrease in Ca:Mg ratio had no significant effect on plant P contents.
{"title":"Effects of salinity and Ca:Mg ratio of irrigation water on pistachio seedlings phosphorus planted under greenhouse conditions.","authors":"S. Saadat, F. Dehghany, H. Rezaei, L. Esmaeelnejad, P. Maleki","doi":"10.22059/JDESERT.2020.78161","DOIUrl":"https://doi.org/10.22059/JDESERT.2020.78161","url":null,"abstract":"Phosphorus (P) is a key element in many biological processes of plants and animals. We aimed to investigate the effect of different salinity levels and Ca:Mg ratios of irrigation water arid lands on soil available P, soluble P, and P absorbed by the pistachio plant. For this purpose, a greenhouse experiment was conducted by sowing the seeds of pistachio in a factorial randomized block design with four soil salinity levels (S1 (6 dS.m-1irrigation water salinity, leaching fraction (LF) = 50), S2, S3, and S4 (9 dS.m-1 irrigation water salinity, LF = 50, 30 and 20, respectively)) and three Ca:Mg ratios (M1, M2, and M3 equal to 1, 0.5, and 0.25, respectively). After harvesting the plants, the amount of soil available P (Po), water-soluble P (Pw), and total P (Pt) at soil depths of 0-5, 5-25, 25-50, and 50-75 cm, and P concentration in the leaves of Pistachio seedlings were measured.The results showed that the salinity of soil saturated extract had no significant effect on Po, Pw, and Pt. The reduction in Ca:Mg ratio increased Po and Pw in soil surface but it did not affect Pt. Increasing salinity from S1 to S2 augmented plant P uptake but at higher salinity levels, P uptake was reduced. The decrease in Ca:Mg ratio had no significant effect on plant P contents.","PeriodicalId":11118,"journal":{"name":"Desert","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48004105","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 : 2020-06-01DOI: 10.22059/JDESERT.2020.78168
H. Matinfar, A. Fariabi, S. K. Alavipanah
Soil salinity undergoes significant spatial and temporal variations; therefore, salinity mapping is difficult, expensive, and time consuming. However, researchers have mainly focused on arid soils (bare) and less attention has been paid to halophyte plants and their role as salinity indicators. Accordingly, this paper aimed to investigate the relationship between soil properties, such as electrical conductivity of the saturation extract (ECe) and the spectral reflectance of vegetation species and bare soil, to offer a method for providing salinity map using remote sensing. Various vegetation species and bare soil reflectance were measured. Spectral Response Index (SRI) for bare soil and soil with vegetation was measured via the Normalized Difference Vegetation Index (NDVI), Soil Adjusted Vegetation Index (SAVI), and salinity indexes. The electrical conductivity of the saturated extract, texture, and organic matter of soil samples were determined. The correlation coefficient of soil salinity with SRI, SAVI, and salinity indexes were obtained, and a model was presented for soil salinity prediction. EC map was estimated using the proposed model. The correlation between SRI and EC was higher than other models (0.97). The results showed that the salinity map obtained from the model had the highest compliance (0.96) with field findings. In general, in this area and similar areas, the SRI index is an acceptable indicator of salinity and soil salinity mapping.
{"title":"Evaluating different spectral indices in identification and preparation of soil salinity mapping of arid region of Iran","authors":"H. Matinfar, A. Fariabi, S. K. Alavipanah","doi":"10.22059/JDESERT.2020.78168","DOIUrl":"https://doi.org/10.22059/JDESERT.2020.78168","url":null,"abstract":"Soil salinity undergoes significant spatial and temporal variations; therefore, salinity mapping is difficult, expensive, and time consuming. However, researchers have mainly focused on arid soils (bare) and less attention has been paid to halophyte plants and their role as salinity indicators. Accordingly, this paper aimed to investigate the relationship between soil properties, such as electrical conductivity of the saturation extract (ECe) and the spectral reflectance of vegetation species and bare soil, to offer a method for providing salinity map using remote sensing. Various vegetation species and bare soil reflectance were measured. Spectral Response Index (SRI) for bare soil and soil with vegetation was measured via the Normalized Difference Vegetation Index (NDVI), Soil Adjusted Vegetation Index (SAVI), and salinity indexes. The electrical conductivity of the saturated extract, texture, and organic matter of soil samples were determined. The correlation coefficient of soil salinity with SRI, SAVI, and salinity indexes were obtained, and a model was presented for soil salinity prediction. EC map was estimated using the proposed model. The correlation between SRI and EC was higher than other models (0.97). The results showed that the salinity map obtained from the model had the highest compliance (0.96) with field findings. In general, in this area and similar areas, the SRI index is an acceptable indicator of salinity and soil salinity mapping.","PeriodicalId":11118,"journal":{"name":"Desert","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47832382","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 : 2019-12-01DOI: 10.22059/JDESERT.2019.74952
Y. Asadi, K. Ezimand, H. Keshtkar, S. K. Alavipanah
Urbanization is developing unprecedentedly on a global scale. One of the chief repercussions of urbanization, caused by man-made alterations in land-use/land-cover (LULC), is the formation of urban heat islands. Albeit, differences among landscape structures and its accompanied effects on the environment are mostly neglected. Accordingly, the main objective of this study is to survey the various effects of LULC on urban heat island in terms of landscape metrics. For this purpose, Landsat-8 images and land-use maps extracted for the study region (Urmia) were employed. Landscape metrics were calculated from Landsat images with spatial resolution of 30 m for five varying scenarios (residential lands of five-floors and more, residential lands with less than five-floors, administrative-commercial lands, industrial lands, educational and health lands). The metrics were then investigated with respect to two types of land-cover (vegetation and impervious lands). Analysis results indicate that following industrial use, administrative-commercial use is the most significant factor contributing to the formation of heat islands. Results also stipulated the indirect relationship between vegetation and land surface temperature for all scenarios, with the exception of industrial use; in contrast impervious surfaces showed a direct relationship with earth temperature. Study results further determined the effectiveness of human factors in conjunction with LULC as amongst key factors influencing urban LST. Finally, the study specified how different effects of LULC on heat island of Urmia can be well defined with reference to landscape metrics.
{"title":"A Survey of Landscape Metrics and Land-use/land-cover Structures on Urban Heat Islands Surface: A Case Study on Urmia City, Iran","authors":"Y. Asadi, K. Ezimand, H. Keshtkar, S. K. Alavipanah","doi":"10.22059/JDESERT.2019.74952","DOIUrl":"https://doi.org/10.22059/JDESERT.2019.74952","url":null,"abstract":"Urbanization is developing unprecedentedly on a global scale. One of the chief repercussions of urbanization, caused by man-made alterations in land-use/land-cover (LULC), is the formation of urban heat islands. Albeit, differences among landscape structures and its accompanied effects on the environment are mostly neglected. Accordingly, the main objective of this study is to survey the various effects of LULC on urban heat island in terms of landscape metrics. For this purpose, Landsat-8 images and land-use maps extracted for the study region (Urmia) were employed. Landscape metrics were calculated from Landsat images with spatial resolution of 30 m for five varying scenarios (residential lands of five-floors and more, residential lands with less than five-floors, administrative-commercial lands, industrial lands, educational and health lands). The metrics were then investigated with respect to two types of land-cover (vegetation and impervious lands). Analysis results indicate that following industrial use, administrative-commercial use is the most significant factor contributing to the formation of heat islands. Results also stipulated the indirect relationship between vegetation and land surface temperature for all scenarios, with the exception of industrial use; in contrast impervious surfaces showed a direct relationship with earth temperature. Study results further determined the effectiveness of human factors in conjunction with LULC as amongst key factors influencing urban LST. Finally, the study specified how different effects of LULC on heat island of Urmia can be well defined with reference to landscape metrics.","PeriodicalId":11118,"journal":{"name":"Desert","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44983450","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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