YANG Liting,LIU Jun'e,WANG Zhanli,et al.Effects of Polysaccharide(Jag C162)on Runoff Process for a Loessial Slope[J].Research of Soil and Water Conservation,2022,29(04):100-107.
多糖(Jag C162)对黄土坡面径流过程的影响
- Title:
- Effects of Polysaccharide(Jag C162)on Runoff Process for a Loessial Slope
- 文章编号:
- 1005-3409(2022)04-0100-08
- 关键词:
- 多糖Jag C162; 初始产流时间; 径流过程; 水稳性团聚体
- 分类号:
- S157.1
- 文献标志码:
- A
- 摘要:
- 天然高分子多肽衍生物Jag C162是一种新型高聚物,研究其对黄土坡面径流过程的影响可为土壤侵蚀的化学调控技术提供新的理论依据。通过室内人工模拟降雨试验,在不同坡度(10°,15°,20°)、降雨强度(1,1.5,2 mm/min)、Jag C162不同撒施剂量(0,1,3,5 g/m2)的组合条件下,研究了Jag C162对坡面径流过程的调控效应。结果表明:(1)撒施中(3 g/m2)、小剂量(1 g/m2)Jag C162的初始产流时间相对裸坡显著滞后(p<0.05),大剂量(5 g/m2)的初始产流时间则显著提前(p<0.05)。(2)不同剂量Jag C162的坡面径流率随径流过程的变化大致趋势为由快速增长逐渐趋于缓慢递增状态。不同剂量Jag C162径流率的大小顺序为:裸土>1 g/m2>5 g/m2>3 g/m2。(3)Jag C162会显著改善>0.25 mm土壤水稳性团聚体含量,显著提高各粒级土壤水稳性团聚体的含量(p<0.05),尤以1～2,2～5,>5 mm粒径的团聚体含量的提高幅度大。因此,Jag C162可显著改善土壤团聚体结构,提高土壤入渗性能,减少地表径流量,从而减弱侵蚀发生的径流动力,达到调控土壤侵蚀的目的。
- Abstract:
- The natural polymer derivative Jag C162 is a new type of polymer. Studying the impact of the polymer on the runoff process of loess slopes can provide a new theoretical basis for the chemical regulation of soil erosion on loess slopes. The purpose of this study is to explore the regulatory effect of Jag C162 on soil properties and runoff processes. The effect of Jag C162 on the runoff processes was studied under three rainfall intensities(1, 1.5, 2 mm/min), three slope gradients(10°, 15°, 20°), and four rates(0, 1, 3, 5 g/m2)based on indoor artificial simulated rainfall experiments. The results show that:(1)the runoff onsets of 1 g/m2and 3 g/m2 Jag C162 were significantly lagging behind that of bare slope(p<0.05), while the runoff onset was significantly earlier for 5 g/m2 Jag C162(p<0.05);(2)runoff rates increased rapidly and then tended to a slow increase under different rates of Jag C162; the runoff rates of different rates of Jag C162 decreased in the order: 0 g/m2>1 g/m2>5 g/m2 >3 g/m2;(3)for all three rates, Jag C162 could improve the contents of >0.25 mm soil water-stable aggregates significantly, also for different sizes of aggregates; in particular, the contents of aggregates of 1～2 mm, 2～5 mm, and >5 mm increased greatly with increased rates. Therefore, Jag C162 could significantly improve soil aggregate structure, improve soil infiltration performance, reduce surface runoff, and weaken the runoff dynamics of erosion, so as to achieve the purpose of soil erosion control.
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备注/Memo
收稿日期:2021-05-20 修回日期:2021-06-10
资助项目:国家自然科学基金面上项目(42077058,41601282); 中央高校基本科研业务费专项资金项目(GK202001003,GK202103150); 陕西省高校科协青年人才托举计划资助(20210705)
第一作者:杨莉婷(1995—),女,山西霍州人,硕士研究生,研究方向为土壤侵蚀。E-mail:yangliting29@163.com
通信作者:刘俊娥(1987—),女,山西河曲人,博士,副教授,主要从事土壤侵蚀研究。E-mail:liujune5@snnu.edu.cn