ISWC OpenIR  > 水保所知识产出(1956-2013)
残膜对土壤水分水平运动的阻滞作用
邹小阳1,3; 牛文全1,2; 刘晶晶4; 许健2; 张明智4
2016
Source Publication水土保持学报
Volume30Issue:3Pages:96-108
Abstract

为探明不同残膜量对土壤水分水平运动过程的影响规律,设置6个残膜量水平,分别为0,80,160,
320,640,1 280kg/hm2,采用室内水平土柱吸渗法,分析残膜对水平湿润锋运移、累积入渗量、Boltzmann
系数和土壤水分扩散率的影响。结果表明:水平湿润锋运移速率、土壤含水率和累积入渗量均随残膜量增
加而减小,残膜量≥160kg/hm2 时,水平湿润锋运移速率和累积入渗量大幅降低;残膜对土壤水分水平运
动的阻滞系数与残膜量呈正相关关系,残膜阻滞系数的最大增长率出现在80~160kg/hm2 残膜量区间,
高达251.15%;随残膜量的增加,阻滞作用较强区域距离入渗点的距离增大,Boltzmann系数和水分扩散率
则逐渐减小,土壤基质势对水分水平运动的驱动作用和土壤持水能力逐渐减弱;混有残膜的土壤水分水平
运动过程,仍符合土壤水分扩散率单一参数模型和Kostiakov入渗模型。残膜是一种难降解持续性污染
物,会降低水平湿润锋运移速率、累积入渗量和土壤水分扩散率,对土壤水分水平运动的阻滞作用随残膜
增多而增强。

Other Abstract

Aimed to investigate the effect of different amounts of residual plastic film on soil water horizontal
diffusion process.By using the horizontal soil column simulation investigation,six kinds of residual plastic
film (0,80,160,320,640and 1 280kg/hm2)were designed with triplicate.The wetting front transport
distance,the accumulative infiltration amount and soil water content were determined,then calculated the
Boltzmann coefficient and water diffusivity by using iterative method.The results showed that the migration
rate of horizontal wetting front,the accumulative infiltration amount and volumetric soil water content gradually
declined with the increase of residual plastic film amount.When residual plastic film amount was more
than 160kg/hm2,the migration rate of horizontal wetting front and the accumulative infiltration amount
would dramatically reduce.There were extremely significant positive correlation relationship between the
amount of residual plastic film and retardation coefficient.When the amount of residual plastic film ranged
from 80kg/hm2 to 160kg/hm2,increase rate of retardation coefficient reached up to 251.15%.The distance
from stronger retardation region to infiltration point enlarged with the increase of residual plastic film.
However,Boltzmann coefficient and water diffusivity gradually declined,driving force of soil matric potential
on soil water diffusion and soil water holding ability wore off.The horizontal diffusion process of soil mixed
with residual plastic film still conformed to single parameter model of soil water diffusivity.It suggested that
the residual plastic film as soil pollutant would reduce migration rate of horizontal wetting front,accumulative infiltration amount and soil water diffusivity,the retardation effect of residual film on soil water diffusion
would enhance with increasing residual plastic film amount.

Keyword残膜 土壤水分 湿润锋 Boltzmann系数 阻滞作用
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8545
Collection水保所知识产出(1956-2013)
Affiliation1.中科院水利部水土保持研究所
2.西北农林科技大学水土保持研究所
3.中国科学院大学
4.西北农林科技大学水利与建筑工程学院
Recommended Citation
GB/T 7714
邹小阳,牛文全,刘晶晶,等. 残膜对土壤水分水平运动的阻滞作用[J]. 水土保持学报,2016,30(3):96-108.
APA 邹小阳,牛文全,刘晶晶,许健,&张明智.(2016).残膜对土壤水分水平运动的阻滞作用.水土保持学报,30(3),96-108.
MLA 邹小阳,et al."残膜对土壤水分水平运动的阻滞作用".水土保持学报 30.3(2016):96-108.
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