摘要
以4种不同类型土壤为研究对象,在室内用干筛的0.25-5 mm的团聚体以容积密度为1.40 g/cm^3装填到环刀中,用5种不同浓度的氯化铵溶液分别浸润饱和24、48和72 h后,以纯水为介质采用降水头法测定土壤饱和导水率,探讨了不同类型土壤团聚体的稳定性对盐溶液的反应特征及抗化学物质的破坏能力。结果表明：土壤饱和导水率并非常数,4种供试土壤饱和导水率在不同浓度氯化铵溶液和浸泡时间处理下均呈显著变化,总体表现为盐浓度越高、浸泡时间越长,土壤饱和导水率越小,但不同类型土壤对盐溶液的响应差异显著。由此可得,在纯水中水稳性较强的土壤团聚体却不一定是化学稳定性强的,团聚体的化学稳定性随其胶结剂的类型、数量与质量不同,对土壤溶液中化学物质响应差异显著。
Using 4 different types of soil samples,the saturated hydraulic conductivity of soil was tested with falling head method by filling 0.25~5 mm soil aggregate dry screened in indoor and set with 1.40 g/cm3 bulk density in earth columns.The soil samples were immersed in five ammonium chloride solutions of different concentrations for 24,48 and 72 h later respectively,which was used to discuss the reaction characteristics of different types of soil structural stabilities with saline solution as well as resistances to chemicals damage.The result indicated that the soil saturated hydraulic conductivity were not constant, and the saturated hydraulic conductivity of all 4 types of testing soil decreased significantly with the increasing of ammonium chloride concentration and soaking time.But different types of soil in response to salt solution were significantly different.The main conclusion was that not all water-stable soil aggregates owned stronger chemical stability,and the chemical stability of aggregates had relation with the type, quantity and quality of different cementing agents,especially had significant response to chemical substances in the soil solution.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2014年第4期173-178,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
农业部苹果园沼肥应用技术研究与示范资助项目(201001070070)
关键词
土壤团聚体
化学稳定性
胶结剂
饱和导水率
Soil aggregates
Chemical stability
Grouting agent
Saturated hydraulic conductivity
