Seed removal on loess slopes in relation to runoff and sediment yield

摘要: Overland flow and sediment transport can carry away seeds at the soil surface in soil, cause a secondary seed dispersal event, lead to redistribution, influence spatial distribution of seedling renewal, which plays an important role vegetation restoration succession. The objectives this study were investigate process loss on loess slopes its relationship yield runoff sediment, effects rainfall intensity, slope gradient morphology removal. Rainfall simulation experiments carried out 1 m(2) plots 10 degrees, 15 20 degrees 25 for 60-minute duration with intensities 50 mm/h, 100 mm/h 150 respectively. A mixture 75 from 16 species Chinese hilly-gullied Loess Plateau had been placed these plots, we measured number lost, distance displaced, rate amount, amount. Results showed that accumulated rates closely related corresponding yield, even more removal obviously increased intensity but did not change gradient, results varied among species. At rainfall, there was almost no four slopes, 30-45% moved their original position. However, 79.5% 86.4% eroded Of these, 46.9% 20.4% 32.6% 66.0% lost. Total also affected by amount position composition seeds, length. It suggested during water erosion events affect redistribution and, consequently, distribution. (C) 2010 Elsevier B.V. All rights reserved.