| Cite this article: | 王宏,徐娅玲,刘海涛,等.耕作方式和土壤深度对紫色土胶体迁移的影响[J].灌溉排水学报,2020,(3):-. |
| WANG Hong,XU Ya-ling,LIU Hai-tao,et al.耕作方式和土壤深度对紫色土胶体迁移的影响[J].灌溉排水学报,2020,(3):-. |
|
| |
|
|
| This article has been：Browse 1906Times Download 0Times |
|
|
|
| DOI： |
|
| The effect of tillage methods and investigated soil depths on purple soil colloid transport |
|
WANG Hong, XU Ya-ling, LIU Hai-tao, LIN Chao-wen, ZHANG Qi
|
|
Soil and Fertilizer Institute,Sichuan Academy of Agricultural Sciences,Chengdu
|
| Abstract: |
| Colloids have been recognized to enhance migration of contaminants such as heavy mental、nitrogen and phosphorous、pesticide, and the enhancement depends on colloid size. However, few field investigations have examined different size colloid transport via surface runoff and subsurface flows. Therefore, this study examined different size colloid transport via surface runoff and subsurface flows under variant soil tillage managements (conventional tillage、ridge tillage、conventional tillage with full straw mulching、ridge tillage with full straw mulching、conventional tillage with pulverized straw mulching、ridge tillage with pulverized straw mulching) and in different soil investigation depths (20 cm、40 cm、60 cm、80 cm、100 cm、120 cm). The result indicted that straw mulching significantly decreased surface runoff and increased subsurface flows, especially conventional managements with full straw mulching treatment. Otherwise, subsurface flows amount was decreased with increasing investigated soil depth. The effect of ridge tillage or ridge tillage with straw mulching on reducing large size colloid and <0.22 μm colloids via subsurface runoff effluent concentration and amount was more significant compared to the conventional tillage treatment. The fine colloid size fraction accounted for more in the surface runoff, whereas the large size colloid moved more easily in subsurface flows and the effluent concentration and amount of small size colloid were reduced with increasing investigation soil depth. |
| Key words: ridge cultivation; straw mulching; colloid; surface runoff; subsurface flows |
|
|
|
|
|
|
