Analyzing the effect of sequence rainfalls on soil properties, runoff production and soil loss in soils with different stability at the small plots

Subject Areas : Farm water management with the aim of improving irrigation management indicators

علی رضا واعظی ¹ ( گروه علوم خاک-دانشکده کشاورزی-دانشگاه زنجان )
حسین بیات ² ( دانشجوی کارشناسی ارشد فیزیک و حفاظت خاک دانشگاه زنجان )
سعید رحمتی ³ ( دانشجوی فیزیک و حفاظت خاک دانشگاه زنجان )

Received: 2017-02-15 Accepted : 2018-01-17 Published : 2017-12-22

Keywords: semi-arid region, soil structure, antecedent soil moisture, Soil Texture, bulk density,

Abstract :

Knowledge of the change of soil properties in each event during sequence rainfalls is very important for recognition the critical period of that the soil would be susceptible to erosion processes is vital. This study was conducted to investigate the effect of sequence rainfalls on the changes of soil properties, runoff and soil loss in eighteen different soils with the same aggregate size (from 4 to 6 mm) using the simulated rainfalls. The experiments were performed at small erosion plots with 80 cm long and 60 cm wide under 9% slope steepness during seven sequence rainstorms with 80 mm h-1 in intensity for 30 min and 5-day interval. The results indicated that significant differences were among the soils in bulk density, water retention, runoff and soil loss (p< 0.001). The lowest runoff (14.4 mm) and soil loss (792 g m-2) were observed in the first rainfall event which was associated with higher percentage of water-stable aggregates and lower amount of soil moisture.  In the sequential rainfalls, there was no obvious difference in soil water content, whereas bulk density was significantly increased. Significant relationships were found between soil loss and bulk density (R2= 0.58), and initial soil moisture (R2= 0.75). This study revealed that information on the changes of soil bulk density and initial soil moisture can sufficiently help to predict soil erosion during sequence rainfalls in an area. Wholly, the change of the physical soil properties plays an important role in increasing the soil’s susceptibility to erosion during sequence rainfalls.

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