Investigation on Relation Between Wind Erodibility and Soil Physical and Chemical Properties in Hourolazim-Wetland Khuzestan

Mirian, I. (2014) Investigation on Relation Between Wind Erodibility and Soil Physical and Chemical Properties in Hourolazim-Wetland Khuzestan. Masters thesis, University of Zabol.

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Weatlands Mesopotamian historic wetlands include the Hourolazim ongoing loss. The reasons for this loss fall into two categories, natural and human factors. These factors have been high credibility potential of wetland soils and the region as a secondary source of dust is introduced. In the studied area due to the restrictions such as exclusion zone, area mined and the military, after visiting the transects of perpendicular to the wetland in the era, we measured it from the beginning to the end, then the coordinates of the GPS device moved. It was 44 points on a surface with dimensions of 20 × 20 cm2 and 5 cm depth to zero at any point, soil samples were collected and transported to the laboratory for physical and chemical analysis. The amount of pH was measured with a pH meter, the conductivity of saturated extract with EC meter, organic carbon with Walkley and Black method, the percentage of CaO to neutralize with the hydrochloric acid method, soil texture by pipette, dissolved sodium concentration by flame photometer, calcium concentration and magnesium with titration method, the amount of gypsum precipitated in acetone according to standard methods, MWD using dry sieving, Bulk density with aggregate method and carbonate and bicarbonate were measured by titration. The soil erodes ability and wind erosion threshold velocity is directly measured in the area using a portable wind tunnel. The complexity of the soil system makes it difficult to explain the mechanisms involved in soil structural stability. In the study area away from the wetland of the amount of salinity, pH, sodium, magnesium, calcium, SAR, ESP, HCO3, bicarbonate, organic matter, moisture, and MWD was reduced and the amount of particles were larger than 0/84mm crust and a bulk density increases. Because of the existence of large amounts of minerals on the margin of wetland the amount of particles reduced more than 0/84 mm. The results obtained were analyzed using SAS software. The results showed that 35% of organic matter and soil pH changes in the speed threshold. The percent of the particles was larger than 0/84 mm and the average weight was measured by particle diameter, MWD justified 30 % of the variation in wind erode ability. In addition to physical and chemical factors of soil type, the land use also affects the erode ability of the area. The model with the lowest mean square error for the soil erodes ability with land use crust was close to the 18/66 and 73/46 respectively. The soil wind erosion threshold velocity equation with the least mean square error in land use, 3/33 and 3/4 were obtained in a closed crust.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Wind Erodibility, Hourolazim, Dust Storm, Wind Erosion Mater
Subjects: S Agriculture > S Agriculture (General)
Depositing User: admin admin1 admin2
Date Deposited: 28 May 2016 06:24
Last Modified: 28 May 2016 06:24

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