农业工程学报2012，Vol.28Issue(19)：78-84,7.DOI:10.3969/j.issn.1002-6819.2012.19.011
坡面水流中不同层次红壤团聚体剥蚀程度研究
Research of red soil aggregate abrasion degree of different layers in overland flow
摘要
Abstract
In order to determine the effect of migration distance on the abrasion degree of red soil aggregate in different layer in overland flow, the relationship between aggregate stability of red soil in different layer and abrasion degree was studied based on the analysis of aggregate stability and the simulated scouring experiment in laboratory. Red soils from three areas (Xianning, Jinxian and Changsha city) were chosen for this study. The results showed that the aggregate stability of red soils from wetting sieving and LB methods (fast-wetting and stirring pre-wetted) was the greatest for iron-manganese illuvial layer, intermediate for reticulated mottling layer and least for the surface soil layer in the three areas. However, the slow-wetting treatment had no significant regularity between the different layers in this study. The main mechanisms of aggregate breakdown in different layers were slaking and mechanical breakdown. The abrasion degree of aggregate in different layers was iron-manganese illuvial layer < reticulated mottling layer < surface soil layer in five migration distances. The parameter RMI which describes mechanical breakdown showed a significant correlation with the abrasion degree and abrasion coefficient α. By introducing the parameter RMI and transport distance x, the abrasion degree prediction equation of red soil aggregate in different layer was established with a good correlation coefficient (R2= 0.88). The equation showed a good prediction performance. The results can provide a reference for research on erosion mechanisms of red soil, which is of great significance for the development of adequate soil erosion models.关键词
土壤/剥蚀/团聚体/不同层次/稳定性/坡面水流Key words
soils/ abrasion/ aggregates/ different layers/ stability/ overland flow分类
农业科技引用本文复制引用
王军光,李朝霞,蔡崇法,杨伟,马仁明,王天巍..坡面水流中不同层次红壤团聚体剥蚀程度研究[J].农业工程学报,2012,28(19):78-84,7.基金项目
国家自然科学基金资助项目(40930529 （）
41001164). （）
