ISWC OpenIR  > 水保所知识产出(1956---)
残膜对土壤水分入渗和蒸发的影响及不确定性分析
牛文全1; 邹小阳1,2; 刘晶晶3; 张明智3; 吕望3
2016
Source Publication农业工程学报
Volume32Issue:14Pages:110-119
Abstract

为探究残膜对土壤水分入渗和蒸发过程的影响规律,通过室内土柱试验,设置6 个残膜量水平(0、80、160、
320、640 和1 280 kg/hm2),研究了残膜对湿润锋运移、土壤水分分布、累积入渗量和累积蒸发量及其不确定性的影响。
结果表明:随残膜量增加,湿润锋垂直运移速率和累积入渗量逐渐减小;残膜量>80 kg/hm2 时,湿润锋运移速率大幅下
降;累积蒸发量随残膜量增加而递减而蒸发系数呈递增趋势,土壤保水能力减弱;随残膜量增加,0~10 和20~45 cm 含
水率呈降低趋势,而土壤水分的变异系数呈增加趋势,残膜加剧了土壤水分垂直分布的变异性,残膜量>320 kg/hm2 的处
理会出现表土层“板结”现象;基于Gibbs 抽样算法分析表明,Kostiakov 入渗模型和Rose 蒸发模型各参数的95%后验
置信区间上下限的差值和标准差均随残膜量增加而增大,累积入渗量和累积蒸发量的95%后验置信区间面积呈增大趋势,
土壤累积入渗量和累积蒸发量的不确定性随残膜增多而增强。该研究可探明残膜污染区的土壤水分运动规律,并为提高
Kostiakov 模型、Rose 模型的模拟效率和模拟精度提供参考。

Other Abstract

Pollution of residual plastic film, a continuous pollutant and difficult to degrade, is a major limiting factor for
sustainable development of agriculture in northwest China. Residual plastic film can destroy homogeneity of soil texture and
seriously impede the movement of soil water and solute, and thus greatly enhance the uncertainties in soil water movement. In
order to reveal the negative effects of residual plastic film on soil water infiltration, evaporation and their uncertainties, soil
column simulation experiments were conducted to observe the processes of soil water infiltration and evaporation with
different amounts of residual plastic film in the Key Laboratory of Agricultural Soil and Water Engineering in Arid Area
(108°02′E, 34°17′N), at Northwest A&F University, in Yangling, Shaanxi Province of China, from September to October,
2015. Six amounts of residual plastic film were designed including 0, 80, 160, 320, 640, 1 280 kg/hm2 with triplicate. During
the experiment, the wetting front, the cumulative infiltration and the cumulative evaporation were investigated. Meanwhile,
gravimetric soil moisture was measured after the evaporation process. To mimic the actual distribution characteristic of
residual plastic film in field, fragile plastic film and soil samples were mixed evenly with a blender. During infiltration, when
the wetting front arrived at 40 cm, irrigation water was cut off. Soil columns were covered with waterproof plastic film to
reduce atmospheric evaporation. Soil columns stood for 12 h until the infiltration process completely stopped. In the
consequent process of soil water evaporation, the columns were continuously heated by infrared lamps of 275 W from morning
till night. Soil columns were weighed with an electronic balance at 9:00 a.m. every day to calculate mass change and standard
daily evaporation. Furthermore, an evaporation pan that had the same diameter as soil column was used to measure daily
evaporation from free water surface. Uncertainty analyses were conducted for the simulations with Kostiakov model and Rose
model. The uncertainties of soil cumulative infiltration and evaporation under different treatments were quantitatively analyzed
with the Gibbs sampling algorithm. The results showed that residual plastic film would not only reduce the transport velocity
of vertical wetting front, but also decrease soil cumulative infiltration. When the amount of residual plastic film was more than
80 kg/hm2, transport velocity of wetting front decreased dramatically. As the amount of residual plastic film increased,
consumed time that wetting front arrived at 40 cm significantly prolonged (F=19.11, P<0.05). On the other hand, cumulative
evaporation significantly decreased when the amount of residual plastic film was more than 160 kg/hm2 (F=9.58, P<0.05).
However, evaporation coefficient increased with the increment of residual plastic film, which indicated that the water holding
capacity of soil decreased. Residual plastic film also changed the distribution of soil moisture. As the amount of residual
plastic film increased, gravimetric soil moisture decreased at the 0-10 cm and 20-45 cm depth. At 0-10 cm depth, variable
coefficient of soil moisture increased by 4.33%, 127.19%, 330.40%, 539.63% and 640.23% compared with that for no residue
treatment, respectively. Moreover, the variable coefficient had a trend of decrease at 20-45 cm depth. This implied that the
inhomogeneity of soil water distribution was enhanced due to residual plastic film pollution. Moreover, soil surface hardened
when the amount of residual plastic film was more than 320 kg/hm2. As the amount of residual plastic film increased, the 95%
confidence interval and standard error of posterior parameters all increased for the Kostiakov infiltration model and Rose
evaporation model according to Gibbs sampling algorithm. The areas of posterior distribution intervals of cumulative
infiltration and evaporation also increased. In general, residual plastic film could increase the uncertainties in soil water
infiltration and evaporation. The understanding of the influences of residual plastic film on the processes of soil water
infiltration and evaporation and their uncertainties would provide a good reference for the exploration of soil moisture
movement and distribution in fields polluted by residual plastic films, and improve the efficiency and accuracy of simulations
with the Kostiakov and Rose models.

Keyword土壤 入渗 蒸发 不确定性分析 残膜
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/361005/8544
Collection水保所知识产出(1956---)
Affiliation1.中科院水利部水土保持研究所
2.中国科学院大学
3.西北农林科技大学水利与建筑工程学院
Recommended Citation
GB/T 7714
牛文全,邹小阳,刘晶晶,等. 残膜对土壤水分入渗和蒸发的影响及不确定性分析[J]. 农业工程学报,2016,32(14):110-119.
APA 牛文全,邹小阳,刘晶晶,张明智,&吕望.(2016).残膜对土壤水分入渗和蒸发的影响及不确定性分析.农业工程学报,32(14),110-119.
MLA 牛文全,et al."残膜对土壤水分入渗和蒸发的影响及不确定性分析".农业工程学报 32.14(2016):110-119.
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