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Search Results: 1 - 5 of 5 matches for " Moghiseh "
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Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
Moghiseh,E; Heidari,A;
Journal of soil science and plant nutrition , 2012, DOI: 10.4067/S0718-95162012005000028
Abstract: gypsiferous and saline soils are among the major soils of arid and semi-arid regions of the world. although numerous studies on salic, gypsic and petrogypsic horizons have been carried out, the co-occurrence of gypsum and halite and their morphological expression are still poorly documented. eight pedons located on a co-alluvial fan (bam area, southeast iran) were described, sampled and analyzed for physico-chemical and micromorphological characteristics based on standard methods. the highest amounts of gypsum (~ 60 %) comprising xenotopic gypsum and/or fibrous bassanite pseudomorph remaining behind after xenotopic gypsum dehydration were determined in the surface crust and in the underlying 2byz horizon. at a depth of 15 cm, a horizon cemented by gypsum and halite was observed. the highest amount of gypsum was determined at the upper part of this horizon followed by a sharp decreasing trend towards the lower depth. the amount of halite increases with increasing depth towards the bottom of 3byzm horizon. deeper, in the 5byz horizon the quantity of gypsum increases drastically and coarse elongated gypsum pendants dominate. micromorphological observations demonstrate that the dominant cementing agent is halite rather than gypsum. however, due to inexistence of petrosalic diagnostic horizon in keys to soil taxonomy, these soils are to be classified as petrogypsic haplosalids at subgroup level in soil taxonomy. in wrb taxonomy, they are classified as petrosalic solonchaks. co-occurrence of gypsum and halite in the same horizon, their specific layering and vertical distribution patterns in the studied pedons might be considered as indicators for polygenetic soils in this area.
Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
Moghiseh,E; Heidari,A;
Journal of soil science and plant nutrition , 2012, DOI: 10.4067/S0718-95162012005000028
Abstract: gypsiferous and saline soils are among the major soils of arid and semi-arid regions of the world. although numerous studies on salic, gypsic and petrogypsic horizons have been carried out, the co-occurrence of gypsum and halite and their morphological expression are still poorly documented. eight pedons located on a co-alluvial fan (bam area, southeast iran) were described, sampled and analyzed for physico-chemical and micromorphological characteristics based on standard methods. the highest amounts of gypsum (~ 60 %) comprising xenotopic gypsum and/or fibrous bassanite pseudomorph remaining behind after xenotopic gypsum dehydration were determined in the surface crust and in the underlying 2byz horizon. at a depth of 15 cm, a horizon cemented by gypsum and halite was observed. the highest amount of gypsum was determined at the upper part of this horizon followed by a sharp decreasing trend towards the lower depth. the amount of halite increases with increasing depth towards the bottom of 3byzm horizon. deeper, in the 5byz horizon the quantity of gypsum increases drastically and coarse elongated gypsum pendants dominate. micromorphological observations demonstrate that the dominant cementing agent is halite rather than gypsum. however, due to inexistence of petrosalic diagnostic horizon in keys to soil taxonomy, these soils are to be classified as petrogypsic haplosalids at subgroup level in soil taxonomy. in wrb taxonomy, they are classified as petrosalic solonchaks. co-occurrence of gypsum and halite in the same horizon, their specific layering and vertical distribution patterns in the studied pedons might be considered as indicators for polygenetic soils in this area.
Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
E Moghiseh,A Heidari
Journal of Soil Science and Plant Nutrition , 2012,
Abstract: Gypsiferous and saline soils are among the major soils of arid and semi-arid regions of the world. Although numerous studies on salic, gypsic and petrogypsic horizons have been carried out, the co-occurrence of gypsum and halite and their morphological expression are still poorly documented. Eight pedons located on a co-alluvial fan (Bam area, southeast Iran) were described, sampled and analyzed for physico-chemical and micromorphological characteristics based on standard methods. The highest amounts of gypsum (~ 60 %) comprising xenotopic gypsum and/or fibrous bassanite pseudomorph remaining behind after xenotopic gypsum dehydration were determined in the surface crust and in the underlying 2Byz horizon. At a depth of 15 cm, a horizon cemented by gypsum and halite was observed. The highest amount of gypsum was determined at the upper part of this horizon followed by a sharp decreasing trend towards the lower depth. The amount of halite increases with increasing depth towards the bottom of 3Byzm horizon. Deeper, in the 5Byz horizon the quantity of gypsum increases drastically and coarse elongated gypsum pendants dominate. Micromorphological observations demonstrate that the dominant cementing agent is halite rather than gypsum. However, due to inexistence of petrosalic diagnostic horizon in Keys to Soil Taxonomy, these soils are to be classified as Petrogypsic Haplosalids at subgroup level in Soil Taxonomy. In WRB Taxonomy, they are classified as Petrosalic Solonchaks. Co-occurrence of gypsum and halite in the same horizon, their specific layering and vertical distribution patterns in the studied pedons might be considered as indicators for polygenetic soils in this area.
Impacts of deforestation and reforestation on soil organic carbon storage and CO2 emission
Ebrahim Moghiseh,Ahmad Heidari,Mohammad Ghannadi
Soil & Environment , 2013,
Abstract: Soil organic carbon (SOC) storage and CO2 flux into the atmosphere can be influenced by land use change, especially re/deforestation. The impacts of conversion of primary deciduous (PF) to secondary coniferous (SF) forest and deforestation of PF land to abandoned rangeland (AR) on various soil properties, SOC storage, and soil CO2 emission were investigated on the selected sites (Neshat and Garakpass) in Kelardasht region, northern Iran. The highest SOC storages were determined in coniferous forest land uses (SF1=255.00 and SF2=237.90 Mg C ha 1) followed by deciduous forest (PF1=216.74 and PF2=159.12 Mg C ha 1) and abandoned rangeland (AR1=185.31 and AR2=151.60 Mg C ha 1). Land use changes showed significant impacts on soil CO2 efflux. The significant positive correlations, with exponential and linear relationships were observed between the monthly CO2 emissions; the minimum air temperature and the cumulative precipitation in the last week ended to CO2 measurement time. The highest recorded soil CO2 efflux in a wide range of land uses were obtained in August to October due to more suitable temperature and rainfall distribution. Based on lower CO2 emission in abandoned rangelands, lesser soil organic carbon is related to lower input to soil. The higher C: N ratios in litter and some of mineral horizons (SF2) and lower CO2 emissions by the higher lignin and polyphenol concentrations (SF1) in coniferous forests compared to deciduous forests have probably caused increasing SOC storage.
CHARACTERIZATION OF THE FORMATION OF FILTER PAPER USING THE BARTLETT SPECTRUM OF THE FIBER STRUCTURE
Martin Lehmann,Jobst Eisengr?ber-Pabst,Joachim Ohser,Ali Moghiseh
Image Analysis and Stereology , 2013, DOI: 10.5566/ias.v32.p77-87
Abstract: The formation index of filter paper is one of the most important characteristics used in industrial quality control. Its estimation is often based on subjective comparison chart rating or, even more objective, on the power spectrum of the paper structure observed on a transmission light table. It is shown that paper formation can be modeled as Gaussian random fields with a well defined class of correlation functions, and a formation index can be derived from the density of the Bartlett spectrum estimated from image data. More precisely, the formation index is the mean of the Bessel transform of the correlation taken for wave lengths between 2 and 5 mm.
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