Vaezi, A., Rostami, A., Mohammadi, M. (2012). Temporal Variations of Aggregates Breakdown and Splash Particles Processes in a Marl Soil Under Simulated Rainfall. , 25(4), 361-371. doi: 10.22092/ijsr.2012.126518
Ali Reza Vaezi; A. Rostami; M. H. Mohammadi. "Temporal Variations of Aggregates Breakdown and Splash Particles Processes in a Marl Soil Under Simulated Rainfall". , 25, 4, 2012, 361-371. doi: 10.22092/ijsr.2012.126518
Vaezi, A., Rostami, A., Mohammadi, M. (2012). 'Temporal Variations of Aggregates Breakdown and Splash Particles Processes in a Marl Soil Under Simulated Rainfall', , 25(4), pp. 361-371. doi: 10.22092/ijsr.2012.126518
Vaezi, A., Rostami, A., Mohammadi, M. Temporal Variations of Aggregates Breakdown and Splash Particles Processes in a Marl Soil Under Simulated Rainfall. , 2012; 25(4): 361-371. doi: 10.22092/ijsr.2012.126518

Temporal Variations of Aggregates Breakdown and Splash Particles Processes in a Marl Soil Under Simulated Rainfall

پژوهش های خاک
Volume 25, Issue 4, March 2012, Pages 361-371    PDF (1.45 M)
Document Type: Research Paper
DOI: 10.22092/ijsr.2012.126518
Authors
Ali Reza Vaezi* 1; A. Rostami2; M. H. Mohammadi1
1Assistant Prof.essor of soil science department, Faculty of Agriculture, Zanjan University
2M. S. c student of soil science of Zanjan University
Abstract
Aggregate breakdown and splash particles are the most important results of raindrops impact on soil surface. The study was conducted to investigate the temporal variations of breakdown and splash processes in a virgin marl soil in Zanjan Province. The experiment was carried out as a completely randomized design with eight rainfall duration treatments and three replications, in 2010. Twenty four flat boxes with dimensions of 30 cm× 40 cm were filled with soil aggregates (6-8 mm). The aggregates boxes were placed under a rainfall simulator with a constant intensity of 40 mm h-1.The aggregate breakdown values was obtained based on comparison of the mean weight diameter of the aggregates before and after rainfall events. The splash values were determined from the dry weight of soil particles that had splashed out around the boxes during each rainfall event. Based on the results, there were significant relationships between the rainfall duration and both the aggregate breakdown (R2= 0.99, p<0.01) and the particles splash (R2=0.95, p<0.05). The aggregate breakdown value was low at the beginning of rainfall (7.5 min), but it increased with increasing rainfall duration and, subsequently, soil surface was crusted in 45 min. At this time, aggregate breakdown and particles splash values were almost maximized. After 45 min, aggregate breakdown and particles splash values were negligibly increased due to crust formation at soil surface. There was a significant relationship between the particles splash and the aggregate breakdown (R2=0.98, p<0.05). 
Keywords
Aggregate breakdown; Splash particles; Rainfall duration; Particles detachment; Aggregate mean weight diameter
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