摘要
选取赣南凝灰质砂岩崩岗土体为研究对象,采用环刀法研究凝灰质砂岩崩岗土体入渗特性,并分析土体主要理化性质对其入渗特征的影响。结果表明:①凝灰质砂岩风化壳土体重度表现为上层小于下层;受土体相对密度的影响,不同土层土体总孔隙度大小并未呈现出与土壤容重相反的规律,同样表现为上层小于下层;不同土层之间的土壤重度与总孔隙度无显著相关性。②凝灰质砂岩下层土体初始渗透速率、稳定渗透速率、平均渗透速率、入渗量等渗透参数均显著高于上层土体(P<0.05),而稳定入渗时间低于上层土体。③凝灰质砂岩初始渗透速率与所选的指标均无显著的相关性,稳定渗透速率与土壤重度呈极显著负相关,平均渗透速率与总孔隙度、毛管孔隙度呈极显著正相关。
Taking the tuffaceous sandstone collapsed soil in south Jiangxi as the research object,we explored the infiltration characteristics of collapsed soil by ring knife method,and analyzed the influence of main physical and chemical properties on infiltration characteristics of the soil.The results show that:(1)The bulk density of weathered soil in the upper layer is smaller than that in the lower layer;influenced by specific gravity of the soil,the total porosity of different soil layers does not exhibit an opposite trend with soil bulk density,and it also shows that the upper layer is less than the lower layer.There is no significant correlation between soil bulk weight and total porosity in different soil layers.(2)The initial infiltration rate,stable infiltration rate,average infiltration rate,infiltration amount and other infiltration parameters of the lower layer of tuffaceous sandstone soil are all significantly higher than those of the upper soil layer(P<0.05),while the stable infiltration time of lower soil layer is shorter than that of the upper layer.(3)The initial infiltration rate has no significant correlation with the selected indicators,the stable infiltration rate shows a very significant negative correlation with soil bulk density,and the average infiltration rate shows a very significant positive correlation with total porosity and capillary porosity.
作者
赵静
李经纬
危丁
唐剑波
牛德奎
ZHAO Jing;LI Jingwei;WEI Ding;TANG Jianbo;NIU Dekui(Spatial Information Technology Application Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;Water Affairs and Lakes Bureau of Caidian District,Wuhan 430100,China;Agriculture Comprehensive Law Enforcement Brigade of Caidian District,Wuhan 430100,China;Demonstration and Promotion Center of Soil and Water Conservation Technology of Guizhou Province,Guiyang 550002,China;College of Land Resources and Environment,Jiangxi Agricultural University,Nanchang 330006,China)
出处
《长江技术经济》
2024年第5期91-95,119,共6页
Technology and Economy of Changjiang
基金
中央部门预算项目库区维护和管理基金项目(2136703)。
关键词
凝灰质砂岩
崩岗
孔隙度
渗透性
tuffaceous sandstone
collapse mound
porosity
permeability
