| Effect of rainfall intensity on soil and water conservation of tillage practices |
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| DOI：10.7606/j.issn.1000-7601.2019.02.31 |
| Key Words: tillage practice soil and water conservation rainfall intensity slope sediment reduction benefits runoff reduction benefits |
| Author Name | Affiliation | | FANG Qian | College of Forestry, Guizhou University, Guiyang, Guizhou 550025, China | | ZHAO Long-shan | College of Forestry, Guizhou University, Guiyang, Guizhou 550025, China | | WU Fa-qi | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Tillage practices are one of the key measures for soil and water conservation in the agricultural lands. The objective of this study was to determine the effect of rainfall intensity on soil and water loss in agricultural lands under different tillage practices and simulated rainfall. Rainfall intensity was at 60, 90 mm·h-1 and 120 mm·h-1 and two slopes of surface were 5° and 15°. Tillage practices included contour ploughing, deep hoeing, and shallow hoeing. Results showed that: (1) With increasing rainfall intensities, the runoff of agricultural land increased significantly by 1.51 times or more, and the maximum increase was 2.28 times with contour ploughing. However, the increase of the sediment yield was not significant when the rainfall intensity was low. When the rainfall intensity was increased to 120 mm·h-1, the sediment yield from slope field increased significantly; (2) Compared with the smooth surface, contour ploughing have the greatest effect on reducing runoff loss under three rainfall intensities at more than 15%, however, there was no significant change in that with deep hoeing and shallow hoeing; (3) With 5° of slope, contour ploughing and deep hoeing had more than 25% of sediment reduction under all three rainfall intensities, but no obvious sediment reduction was observed in the surfaces under shallow hoeing. On the surfaces with 15° of slope, sediment reduction benefits of deep hoeing and shallow hoeing was not significant under rainfall intensity of 60 to 90 mm·h-1. Three tillage practices was unable to significantly reduce sediment yield under 120 mm·h-1 rainfall intensity. It was shown that soil and water conservation tillage measures effectively reduced the runoff on sloped land, but the effectiveness on reducing the sediment yield varied significantly. Under the condition of steep slope and heavy rainfall, the tillage was not able to reduce the sediment yield but aggravated the soil loss of sloped land. |
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