潮土水分入渗与再分布性能的模拟研究  

Simulated Study on Water Infiltration and Redistribution in Chao Soil

作　　者：李云霞[1,2,3] 赵建军[1,2,3] 张和甫 杨敏 武明安 

机构地区：[1]河南农业大学 [2]罗山县农业试验站 [3]南召县种子公司

出　　处：《河南农业大学学报》1998年第3期216-219,共4页Journal of Henan Agricultural University

摘　　要：对潮土入渗性能的室内土柱模拟研究结果表明，土壤水分的湿润深度与入渗时间呈指数关系，当湿润锋下移至额定饱和加水深度后，其速度明显下降；水分湿润深度与湿润层的含水量呈线性关系、与湿润锋下移速度呈乘幂关系；湿润层的含水量与湿润速率呈指数关系；入渗时间与润湿层的土壤吸力呈线性关系。结果还表明，在模拟条件下，潮土土壤表层对水分的有效持水能力为０００５～００１ＭＰａ，随着水分再分布的进行，湿润层水分含量明显下降，额定饱和加水深度下部土壤的吸力梯度不断增加，水分下移通量进一步减少，但在较短时间内，对表层土壤吸力梯度影响不大。The indoor soil column simulated study on water infiltration in Chao soil showed that the humidity depth of soil had a exponential relation with percolating time,a linear relation with the water content of humidity layer,and a power relation with the dropping speed of the wetting front;and that the percolating time had a linear relation with the soil water suction of humidity layer.It also showed that under the condition of simulation,the effective water holding capacity of the Chao soil surface was 0.005～0.01MPa.With the redistribution of water,the water content of humidity layer dropped significantly,the suction gradient under the rated saturation depth of water increased gradually,while the amount of the dropping water reduced further.It wouldn’t affect the water suction gradient on the surface in a short time.

关 键 词：潮土 入渗 湿润深度 湿润速度 土壤吸力 

分 类 号：S152.72[农业科学—土壤学]