:: Volume 11, Issue 39 (1-2018) ::
jwmseir 2018, 11(39): 11-21 Back to browse issues page
The Effect of Initial Moisture on Runoff Generation and Soil Loss in Different Soil Textures under Simulated Rainfall Condition
Ali Reza Vaezi *, Mehran Behtari
Abstract:   (6971 Views)

The surface soil moisture content has an important and effective role in runoff generation and soil loss, especially in the arid and semiarid regions. For this purpose, an experiment to determine the effect of initial moisture on runoff and soil loss in two soil texture of loamy, sandy clay loam in intact land in range the University of Zanjan was performed with four initial moisture levels (one, four, seven and 10 days). Field experiment as factorial in randomized block design was done in plot scale (60Í80cm) using a rainfall simulator. Twelve plots for each soil were installed on a uniform slope of seven percent and accordingly exposed to simulated rainfall with intensity of 55 mmh-1 for 30 min. The results showed that, significant difference was found in runoff generation (p<0.01) among initial soil moisture levels in each soil, that this issue was affected by the initial moisture content in the soils. No significant difference was observed in soil loss between the initial moisture levels in loamy soil (p>0.05), high initial moisture aggregates in this soil resisted versus detachment by raindrops, while these changes were significant among the soil moisture levels of the sandy clay loam soil (p<0.05), which was associated with a small amount of organic matter and more clay. Contrary to expectation, there was no significant relationship (p>0.05) between soil loss and runoff generation under moisture levels in soils.

Keywords: Initial soil moisture, Runoff plot, Moisture levels, Soil texture
Full-Text [PDF 566 kb]   (5202 Downloads)    
Type of Study: Research | Subject: Special
Received: 2012/11/11 | Accepted: 2017/11/29 | Published: 2018/01/7

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