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Characteristics of soil erosion and sediment size distribution for different land uses in the Chinese Mollisol region

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Journal of Mountain Science 2021年第5期18卷 1295-1306页

作者： SHEN Hai-ou FENG Jun WANG Dong-li LI Hong-li WANG Yu College of Resources and Environment Jilin Agricultural UniversityChangchun 130118China College of Environmental Science and Engineering Liaoning Technical UniversityFuxin 123000China

Soil erosion is currently a major contributor to the degradation of global soil *** characteristics of sediment size distribution affect soil erosion ***,few studies have quantitatively explored soil erosion processes and sediment size distributions on natural hillslopes for different land uses,especially in the Chinese Mollisol *** objective of this study was to investigate the impacts of land uses(corn,fallow,buffer strip and bare hillslopes)under 5°and 10°slope gradients on total runoff,runoff rates,soil losses,sediment concentration processes,and sediment size *** runoff plots(20 m long and 5 m wide)were subjected to inflow scour experiments(1 L min–1 m–2,lasting 40 min).The results showed that the total runoff varied from 2.62 to 6.40 L m–2 and from 8.36 to 20.39 L m–2 on hillslopes at 5°and 10°,*** changes in runoff rates versus run time exhibited gradual increasing trends at 5°,but exhibited initial rapidly increasing trends and then relatively stable trends at 10°.Fallow hillslopes produced the lowest soil losses,which were 45.34%-45.92%,2.74%-6.72%and 1.68%-3.44%for the corn,buffer strip and bare hillslopes,*** sediment concentrations were very small and stabilized between 0.5-2.0 g L–1 on the fallow hillslopes and 1.5-3.0 g L–1 on the corn hillslopes at 5°,but the changing trends in sediment concentration versus run time for the four land uses generally decreased at 10°.Furthermore,it was demonstrated that the proportion of sediment<0.25 mm was the largest in comparison with the other sediment size fractions,and<0.25 mm soil particles and aggregates played a dominant role in soil aggregate loss under different land ***,protecting these precious soil particles and aggregates by applying proper soil conservation measures especially for the relatively gentle hillslopes was particularly ***,the fallow hillslope with greater soil and water conservation capacitie

关键词： field plot Runoff Sediment size Simulation Soil loss

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