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.
Abdolrasoul Shafiey Dastjerdi; Mohammad Hossein Mahdian; Kourosh Kamali; Hamid Hoseyni Marandi
Abstract
Entrance of high volume of floodwater containing huge amount of suspended sediments into the floodwater spreading networks which deposits sediments, as well as infiltration of soluble materials and fine grained, gradually changes the infiltration rate of soils. The aims of this project is to study the ...
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Entrance of high volume of floodwater containing huge amount of suspended sediments into the floodwater spreading networks which deposits sediments, as well as infiltration of soluble materials and fine grained, gradually changes the infiltration rate of soils. The aims of this project is to study the quantity and the process of changes made in the soil of Saravan floodwater spreading station. This research has tried to use direct method of infiltration rate measurement, using double ring infiltrometer in two separate time periods of one year each, and to compare it to the experimental area. In order to specify overall situation of infiltration rates in terms of increase or decrease in second period of measurement in comparison to the first one, and as far as data were not distributed normally, Wilcoxon signed-rank test was used. The results showed no significant difference between two separate measurement periods due to few number of floodwater occurrences (three times) in addition to short time interval of one year between the two measurement periods. To determine changing rate of infiltration between strips and between the strips and the experimental field, as far as abnormal distribution of data in this arrangement were concerned, Kruskal-Wallis test was used. Results indicated that the three strips of flood spreading area have no significant difference (at five percent probability level) in two periods of measurement, but the strip related to experimental area has significant difference with other three strips and in both measurement periods. In other words, infiltration rates of all strips under floodwater spreading have been decreased in relation to the experimental area. Moreover, the results were explanatory that only one of the rectangular in both measurement periods had significant difference with experimental rectangular (at five percent probability level) and all the other rectangular have had no significant differences with each other and in comparison to the experimental one, in none of periods of measurement. Main reason of this difference is also related to the thicker sediments deposits in rectangular location, compared to other blocks. Also, infiltration rate decreased by 55.94 percent in flood spreading area compared to experimental area during one-year timeframe and 3.23 percent of reduction.
