Journal
SOIL RESEARCH
Volume 51, Issue 1, Pages 50-58Publisher
CSIRO PUBLISHING
DOI: 10.1071/SR12239
Keywords
rainfall intensity; natural grassland; runoff; sediment yield; infiltration; rainfall simulation
Categories
Funding
- National Natural Science Foundation of China [31172039]
- Special Foundation of National Science and Technology Supporting Plan [2011BAD29B09]
- '111' Project [B12007]
- Supporting Plan of Young Elites of Northwest A and F University
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Runoff volume, sediment yield and infiltration on hillslope in the hilly region of Loess Plateau were studied using a rainfall simulator. Two land cover (natural grassland, NG, and bare hillslope, BS) and three different rainfall intensities (2.0, 1.5, 0.75mm min(-1)) were implemented. The runoff time of the NG(2.0) treatment was 4.8 min earlier, the average infiltration rate was 5.60% lower, the runoff rate was 1.12 times higher and the sediment production rate was 3.28 times lower than those in the BS2.0 treatment. The runoff time for the NG(1.5) and the NG(0.75) treatments were 6 and 27 min slower, respectively, the average infiltration rate were 10.78 and 23.52% higher, respectively, the runoff rate were 1.67 and 4.25 times lower, respectively, and the sediment production rate were 5.21 and 16.75 times lower, respectively, than those for the BS1.5 and BS0.75 treatments. The effects of slope on sediment reduction were significantly greater than the effects of its runoff reduction, and there occurred more significant sediment-reducing effects with the decrease of rainfall intensity. Efficient use of rainfall runoff in the natural grassland at high intensity should be taken into considerations especially under current conditions of the co-existing drought-caused water shortage and soil erosion in the loess hilly regions.
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