Wind erosion in agricultural soils: an example of limited supply of particles available for erosion |
| |
| Affiliation: | 1. Department of Civil and Environmental Engineering, Shiraz University, Shiraz, Iran;2. Department of Natural Resource and Environmental Engineering, Shiraz University, Shiraz, Iran;1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;2. Academy of Disaster Reduction and Emergency Management, Ministry of Emergency Management and Ministry of Education, Beijing Normal University, Beijing 100875, China;3. Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Gothenburg, 40530, Sweden;4. Centro de Investigaciones sobre Deserificación, Consejo Superior de Investigaciones Cientificas (CIDE-CSIC), Montcada, Valencia 46113, Spain;5. Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education, Beijing Normal University, Beijing 100875, China;6. College of Geography and Environmental Sciences, Zhejiang Normal University, Zhejiang 321004, China;7. State Meteorological Agency, Delegation of the Balearic Islands, Palma de Mallorca, Spain;8. Training Center, China Meteorological Administration. Beijing 100081, China;1. Department of Crop and Soil Science, Washington State University, Pullman, WA, United States;2. USDA-ARS Jornada Experimental Range, MSC 3JER, NMSU, Las Cruces, NM, United States;3. Northwest Sustainable Agroecosystems Research Unit, United States Department of Agriculture, Agricultural Research Service (USDA-ARS), Pullman, WA, United States |
| |
| Abstract: | Soil erosion by wind is a complex process since many interacting factors are involved. In addition, wind erosion can show a considerable spatial and temporal variability associated with changes in soil surface conditions. During a wind erosion experiment conducted in August 1995 within an agricultural field of Central Aragón (NE Spain) [López, M.V., Sabre, M., Gracia, R., Arrúe, J.L., Gomes, L., 1998. Tillage effects on soil surface conditions and dust emission by wind erosion in semiarid Aragón (NE Spain). Soil Tillage Res. (in press)], a decay in dust emission (vertical dust flux) with an increase in wind speed was observed at the end of the experimental period. A further analysis of the evolution of the vertical flux with time in response to changes in soil erodibility is shown in the present study. The analysis is based on the comparison of the measured flux with the potential flux predicted for identical wind conditions assuming that the supply of erodible material at the soil surface was unlimited. The potential flux was estimated by using the dust emission model developed by Marticorena and Bergametti [Maticorena, B., Bergametti, G., 1995. Modeling the atmospheric dust cycle: 1. Design of a soil-derived dust emission scheme. J. Geophys. Res. 100, pp. 16415–16430]. The model is based on the parameterization of the threshold wind shear velocity as a function of the aggregate size distribution and the roughness length of soil surface. The results indicate that the observed reduction in soil erodibility with time was probably due to variations in the aggregate size distribution and, more precisely, to a limited supply of erodible particles at the soil surface. This study underlines the need to consider the temporal variability of the surface conditions in wind erosion research and derived models. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
