LI Zhe,HU Feinan,YANG Zhihua,et al.Effect of Soil Surface Electric Field on Aggregate Stability and Water Infiltration of Typical Black Soil[J].Research of Soil and Water Conservation,2021,28(05):61-66.
土粒表面电场对典型黑土团聚体稳定性及水分入渗特性的影响
- Title:
- Effect of Soil Surface Electric Field on Aggregate Stability and Water Infiltration of Typical Black Soil
- 文章编号:
- 1005-3409(2021)05-0061-06
- Keywords:
- surface potential; electric field strength; aggregate stability; infiltration rate; cumulative infiltration amount
- 分类号:
- S152.7
- 文献标志码:
- A
- 摘要:
- 水土资源高效利用是农业绿色发展的重要内容,也是保障我国东北黑土区肥沃耕地资源健康可持续开发利用的关键。土壤水分入渗性能会对农业生产和生态环境造成双重影响,因此研究土壤水分运动及其影响机理具有重要的科学价值和实践意义。通过设置5个电解质溶液浓度梯度(1,0.1,0.01,0.001,0.000 1 mol/L)来定量调控土壤颗粒表面电场,研究不同电场强度下黑土团聚体的稳定性及水分入渗特性。结果表明:(1)随溶液电解质浓度的减小,土壤颗粒表面电位(绝对值)和电场强度均增大,从而导致土壤团聚体稳定性表现出先急剧减小而后保持稳定的趋势,0.01 mol/L是团聚体稳定性发生变化的转折点。(2)在水分入渗过程中,随入渗溶液电解质浓度的减小、土粒表面电位(绝对值)和电场强度的增大,湿润锋运移位置、入渗速率和累积入渗量均减小。土壤水分平均入渗速率和稳定入渗速率均随电解质浓度的降低表现出先急剧减小而后保持稳定的趋势。(3)土粒表面电场通过影响团聚体稳定性,改变土壤孔隙通道,进而影响水分入渗过程。该研究结果揭示了土粒表面电场对东北黑土区水分入渗及土壤结构稳定性的重要影响,可为黑土区土壤水分高效利用及土壤侵蚀防控提供一定的理论参考。
- Abstract:
- The effective utilization of water and soil resources is important for sustainable agricultural development,and also critical for the reasonable development of fertile land resources in the black soil region of the northeast China. Soil water infiltration affects both the agricultural production and the ecological environment. In this study,5 electrolyte solutions with concentrations of 1,0.1,0.01,0.001 and 0.000 1 mol/L were adopted to quantitatively adjust the surface electric field around soil particles for investigating the effect of surface electric field strength on black soil aggregate stability and water infiltration. The results show that:(1)with the decrease of electrolyte concentration,the surface potential(in absolute value)and electric field strength of soil particles increase; as a result,soil aggregates changed from stablility into instablility with 0.01 mol/L being the turning point of soil aggregate stability;(2)in the process of soil water infiltration,the position of wetting front,infiltration rate and cumulative infiltration amount all decrease with the decrease of electrolyte concentration; moreover,the average soil water infiltration rate and stable infiltration rate show the same tendency with that of soil aggregate stability; average soil water infiltration rate and stable infiltration rate first decrease greatly from 1 mol/L to 0.01 mol/L,then the variation is much more gentle with further decrease of electrolyte concentration;(3)soil surface electric field affects the process of water infiltration through affecting the stability of soil aggregates and changing the distribution of soil pore channels. These result reveal that soil electric field can be of vital significance to water infiltration and aggregate stability of the black soil in the northeast China,which can provide theoretical references for the efficient utilization of soil water and the prevention of soil erosion.
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备注/Memo
收稿日期:2020-10-26 修回日期:2020-11-16资助项目:国家重点研发计划战略性国际科技创新合作重点专项“黑土侵蚀防治机理与调控技术”(2016YFE0202900); 国家自然科学基金面上项目“土壤内外力耦合驱动的团聚体破碎及降雨侵蚀响应”(41977024)第一作者:李喆(1996—),男,山东济南人,硕士研究生,主要研究方向:土壤水分运动的研究。E-mail:Lz20200101@126.com通信作者:赵世伟(1962—),男,四川宜宾人,博士,研究员,主要从事植被与土壤互动关系研究。E-mail:swzhao@nwafu.edu.cn