CSIRO PublishingCerdà, A.; González-Pelayo, Ó.; Giménez Morera, A.; Jordán, A.; Pereira, P.; Novara, A.; Brevik, EC.... (2016). Use of barley straw residues to avoid high erosion and runoff rates on persimmon plantations in Eastern Spain under low frequency-high magnitude simulated rainfall events. Soil Research. 54(2):154-165. doi:10.1071/SR15092.The use of barley straw residues to avoid high erosion and 1 runoff rates on persimmon plantations in Eastern Spain under low frequency -high magnitude simulated rainfall events Artemi Cerdà (1) Óscar González-Pelayo (1), Antonio Giménez-Morera (2), Antonio Jordán (3), Paulo Pereira (4), Agata Novara (5), Eric C. Brevik (6), Massimo Prosdocimi (7), Majid Mahmoodabadi (8), Saskia Keesstra (9), Fuensanta García Orenes (10), Coen Ritsema (9) (1) Soil Erosion and Degradation Research Group, Department of Geography, University of Valencia, Valencia, Spain. oscar.gonzalez-pelayo@uv.es and artemio.cerda@uv.es / www.soilerosion.eu Cerdà, Artemi, Óscar González-Pelayo, Antonio Giménez-Morera, Antonio Jordán, Paulo Pereira, Agata Novara, Eric C. Brevik, Massimo Prosdocimi, Majid Mahmoodabadi, Saskia Keesstra, Fuensanta García Orenes, and Coen Ritsema. The use of barley straw residues to avoid high erosion and runoff rates on persimmon plantations in Eastern Spain under low frequency -high magnitude simulated rainfall events. Soil Research. in press. . The straw mulch was found to be extremely efficient in reducing soil erosion rates.

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Abstract. Aggregate breakdown is an important process which controls infiltration rate (IR) and the availability of fine materials necessary for structural sealing under rainfall. The purpose of this study was to investigate the effects of different slope gradients, rain intensities and particle size distributions on aggregate breakdown and IR to describe the formation of surface seal. To address this issue, 60 experiments were carried out in a 35 × 30 × 10 cm detachment tray using a rainfall simulator. By sieving a sandy loam soil, two sub-samples with different maximum aggregate sizes of 2 mm (D max 2 mm) and 4.75 mm (D max 4.75 mm) were prepared. The soils were exposed to two different rain intensities (57 and 80 mm h −1 ) on several slopes (0.5, 2.5, 5, 10 and 20 %) each at three replicates. The result showed that for all slope gradients and rain intensities, the most fraction percentages in soils D max 2 and D max 4.75 mm were in the finest size classes of 0.02 and 0.043 mm, respectively. The soil containing finer aggregates exhibited higher transportability of pre-detached material than the soil containing larger aggregates. Also, IR increased with increasing slope gradient, rain intensity and aggregate size under unsteady state conditions because of less development of surface seal. However, under steady state conditions, no significant relationship was found between slope and IR. The findings of this study revealed the importance of rain intensity, slope steepness and soil aggregate size on aggregate breakdown and seal formation, which can control infiltration rate and the consequent runoff and erosion rates.

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