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Paper Information

Journal:   WATERSHED ENGINEERING AND MANAGEMENT   2019 , Volume 11 , Number 1 #g00636; Page(s) 211 To 219.

Studying impact of flood water spreading on changes of vegetation and topsoil in Koh Khajeh flood spreading station, Sistan

* Faculty of Water and Soil, University of Zabol, Iran
The purpose of this research is to study the changes in some features of the topsoil and vegetation in the land affected by flood and comparing its results with the control area in Koh Khajeh flood spreading station in Hamoon area of Sistan. For this purpose, four sites were considered as flood spreading areas and two sites were selected as control areas. Samples were taken in six sites using the random-systematic method. To this aim, three transects of 100 meters were established in each field and each one had 10 plots of one square meter regarding the dispersion of vegetation. Canopy cover percentage and density were calculated through use of plots and clipping and weighing was used to measure current year's growth as production. Also, to measure soil properties, sampling along each transect and in six points (three points in shrubs understory and three points in bare soil), and factors as EC, pH, nitrogen percentage of the soil, and organic matter percentage were calculated. In order to compare the results regarding soil features, we used 2×2 factorial tests and for the factors regarding vegetation, we used non-paired t test in SPSS. Data normality was assessed using Kolmogorov test. The results indicated that flood water spreading has a significant effect on canopy cover percentage and plant production respectively in probability level of five and one percent, but there is not significant difference between vegetation density in flooded and control areas. Results showed that flood has led to significant increases in soil nitrogen percent and organic matter as well as low acidity and EC in probability level of 5%. At the same time, organic matter, nitrogen and acidity are low compared to shrub understory soil in both treatments. However, EC in soil under shrub is higher than bare soil in both treatments.
Keyword(s): Control area,Sampling,Software,Water spreading area
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