Athar Kaveh; Mohammad Hossein Mahdian; Yahya Parvizi; Reza Sokouti Oskuee; Mohammad Hassan Masih Abadi
Abstract
Carbon storage is one of the assessment criteria of ecosystem sustainability, so land improvement and reclamation can be followed by investigating the effective managerial factors. This study was conducted to investigate the management scenarios and their effects on carbon storage in Sar Firoozabad watershed, ...
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Carbon storage is one of the assessment criteria of ecosystem sustainability, so land improvement and reclamation can be followed by investigating the effective managerial factors. This study was conducted to investigate the management scenarios and their effects on carbon storage in Sar Firoozabad watershed, Kermanshah province, Iran. Mapping units were prepared with combination of slope and aspect layers. The common management systems in the form of scenarios of residue management, crop rotation, and tillage were investigated and relevant indices were quantified. In the next step, the watershed area was separated into homogeneous zones and soil sampling in the units, was performed using a randomized systematic method. After transporting the samples to laboratory, soil organic carbon storage was calculated by determining their bulk density, texture, and organic carbon. Results of multivariate analysis showed that seven variables of tillage index, cereal sequence, straw burning, manure application, rotation systems, winter fallow and plow direction predict 52 percent of the soil carbon storage variability with 0.724 correlation coefficient and 0.46 modeling efficiency, using the cluster analysis,. In general, it can be concluded that cluster analysis is recommended for investigating carbon storage in soils and rotation and tillage systems are significant examples of soil management components that are certainly very important in terms of carbon storage.
Davood Nikkami; Reza Sokouti Oskuee; Ebrahim Brooshkeh; Faniz Heshmati
Abstract
Eroded soil particles within watershed areas are transported in three shape of dissolved, suspended and bed loads by river water discharge. Knowing the amount of suspended and bed loads are necessary in estimating sediment yield of watersheds. Usually, suspended load is measured daily in hydrometric ...
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Eroded soil particles within watershed areas are transported in three shape of dissolved, suspended and bed loads by river water discharge. Knowing the amount of suspended and bed loads are necessary in estimating sediment yield of watersheds. Usually, suspended load is measured daily in hydrometric stations, while this does not happen for bed load. Although, there are many differences between geology formations, rainfall intensities and water discharges of watersheds, the amount of bed loads are considered as a constant unique coefficient of suspended load. So, there would be highly errors in watersheds’ sediment load estimates. In this research, after collecting bed and suspended load data of three hydrometric stations of Badlan on Alandchay, Pol Yazdakan on Ghotourchay and Mazraeh on Baroonchay Rivers in Western Azerbaijan, the data were analyzed and best relations were fitted between bed load and suspended loads. According to statistical analysis all data had high coefficient of correlation at the level of 99 percent and the best equations were chosen accordingly. The ratio of bed to suspended load in Yazdakan, Badlan and Mazraeh stations were 79, 49 and 13 percent, respectively. This ratio was 47 percent for all three stations.
Reza Bayat; Amir Sarreshtedari; Ali Jafari Ardekani; Reza Sokuti Oskuee
Abstract
Due to vegetation cover importance in protecting soil and its important role in controlling erosion, this study was conducted to determine the effect of land use managementon the Orumiyehlake watershed erosion rate, using GIS and RS technologies and EPM model. Using ETM+ 2002 satellite imagery, field ...
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Due to vegetation cover importance in protecting soil and its important role in controlling erosion, this study was conducted to determine the effect of land use managementon the Orumiyehlake watershed erosion rate, using GIS and RS technologies and EPM model. Using ETM+ 2002 satellite imagery, field work and existing map, required layer of model prepared and soil erosion was estimated in the current situation. Management scenarios, with good and bad actions through changes hypothetically in land use rank (decreased and increased in steps of five to 50 percent), the rate of soil erosion and changes in estimates were calculated. Results showed that maximum of erosion rates is belong to 3015 and 3054 sub-watershed with values of 768 and 749, minimum is belong to 3072 and 3056 sub-watershed with values of and 287 respectively and the mean for the watershed 485.9 . Trend of erosion rate change due to land use change was linearly and positive, meanwhile ultimate condition with 50% addition or reduction to land use rank, respectively caused 83.7 and -64.6 percent change in soil erosion.
