| 引用本文: | 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):-. |
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| 摘要: |
| 胶体能够促进污染物如重金属、氮磷、农药等的迁移,而且不同粒径的胶体对污染物迁移的促进作用是不同的。然而,在大田环境下,对不同粒径胶体迁移能力的研究还比较少。因此,本文通过微区试验,设置不同耕作措施(平作、垄作、平作+完整秸秆覆盖、垄作+完整秸秆覆盖、平作+粉碎秸秆覆盖、垄作+粉碎秸秆覆盖)和不同土壤深度(20 cm、40 cm、60 cm、80 cm、100 cm、120 cm)处理,研究其对地表径流和壤中流中产流量、不同粒径范围(0.45-2 μm、0.22-0.45 μm、<0.22 μm)胶体出流浓度和流出量的影响。研究发现：(1)秸秆还田覆盖处理能够显著减少地表径流的产流量,但是会增加壤中流的产流量,特别是完整秸秆还田覆盖；平作条件下,壤中流产流量会随着土壤深度的增加而减少。(2)垄作或垄作+秸秆覆盖处理与平作处理相比能够显著降低地表径流和壤中流中大粒径范围胶体的出流浓度和流出量,而且对壤中流中<0.22 μm粒径的胶体出流浓度和流出量降低程度也比较显著。(3)小粒径的胶体容易随地表径流迁移,而壤中流中粒径较大的胶体更加容易迁移,小粒径胶体颗粒随着土壤深度的增加出流浓度和流出量都会减少。 |
| 关键词: 垄作;秸秆覆盖;胶体;地表径流;壤中流 |
| DOI： |
| 分类号:X |
| 基金项目:省财政创新能力提升工程专项青年基金(2018QNJJ-018)项目；国家重点研发计划(2018YFD0800605)项目；公益性行业(农业)科研专项(201503119-03-01)。 |
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| The effect of tillage methods and investigated soil depths on purple soil colloid transport |
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WANG Hong, XU Ya-ling, LIU Hai-tao, LIN Chao-wen, ZHANG Qi
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Soil and Fertilizer Institute,Sichuan Academy of Agricultural Sciences,Chengdu
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| 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 |
