保水剂施用方式对花岗岩红壤坡面水土保持的影响

发布时间：2019-04-02 17:05

【摘要】：为了获得保水剂对花岗岩红壤坡面水土保持效果最佳的施用方式,通过人工模拟降雨试验和室内分析相结合方法,开展保水剂混施、层施和沟施等施用方式对红壤坡面侵蚀的产流产沙过程影响研究。结果表明:(1)花岗岩红壤坡面施加保水剂后可降低坡面产流、产沙量,延缓产流时间。当雨强为1.0mm/min时,保水剂与土壤混合施用对降低坡面径流及产沙量的影响更为显著。与对照坡面相比,混合施用坡面累积径流降低34%,累积产沙量减少48%;雨强为1.5mm/min时层施保水剂对降低坡面径流及产沙量作用更显著。与对照相比,层施保水剂坡面累积径流降低46%,累积产沙量减少67%。(2)红壤坡面中混合施加保水剂能够增加坡面入渗率,减少坡面径流,增加土壤含水量,发挥了良好的蓄水保土效益。(3)相关性分析表明,保水剂不同施用方式下花岗岩红壤坡面累积产流、产沙量呈现显著相关(P0.05),坡面累积径流量和累积泥沙量间构成幂函数模型。研究结果为花岗岩红壤坡面应用保水剂控制水土流失和揭示相关机理提供参考。
[Abstract]:In order to obtain the best application method of water-retaining agent to soil and water conservation on granite red soil slope, the mixed application of water-retaining agent was carried out by means of artificial simulated rainfall test and indoor analysis. Study on the effect of layer application and ditch application on runoff and sediment yield of red soil slope erosion. The results showed that: (1) the application of water retaining agent on the slope of granite red soil could reduce the runoff yield, sediment yield and delay the production time. When the rain intensity is 1.0mm/min, the mixed application of water retaining agent and soil has a more significant effect on reducing slope runoff and sediment yield. Compared with the control slope surface, the cumulative runoff and sediment yield decreased by 34% and 48%, respectively, when the rainfall intensity was 1.5mm/min, and the effect of water retaining agent on the slope runoff and sediment yield was more significant when the rainfall intensity was higher than that of the control. Compared with the control, the cumulative runoff and sediment yield decreased by 46% and 67% respectively. (2) mixed application of water retaining agent in red soil slope could increase the infiltration rate, decrease the runoff and increase the soil moisture content. (3) the correlation analysis showed that there was a significant correlation between sediment yield and accumulated runoff on granite red soil slope under different application methods of water retaining agent (P0.05), and (3) correlation analysis showed that there was a significant correlation between sediment yield and sediment yield on granite red soil slope under different application patterns of water retaining agent. The power function model is formed between the cumulative runoff and the accumulated sediment amount on the slope. The results provide a reference for the application of water retaining agent to control soil erosion and reveal the related mechanism on granite red soil slope.
【作者单位】：福建师范大学地理科学学院;福建省亚热带资源与环境重点实验室;
【基金】：国家重点研发计划项目“南方红壤低山丘陵区水土流失综合治理”(2017YFC05054) 国家科技支撑计划项目“强度侵蚀区退化生态系统修复关键技术的集成与示范”(2014BAD15B02)
【分类号】：S157

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