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斥水程度对脱水土壤水分特征曲线的影响
陈俊英1; 刘畅1; 张林2; 向友珍1; Leionid Gillerman3; 柴红阳1
2017
Source Publication农业工程学报
Volume33Issue:21Pages:188-193
Abstract

:为研究斥水程度对土壤水分特征曲线的影响,该文基于滴水穿透时间法,人工配置7 种斥水程度的黏壤土(L0~
L6)和6 种斥水程度的砂土(S0~S5),用高速离心机测定其土壤水分特征曲线,应用van Genuchten-Mualem(VG)模
型进行拟合,得出VG 模型水力参数。结果表明:在同一吸力条件下,斥水黏壤土的含水率比斥水砂土的高;随着斥水
程度增加,在相同吸力情况下,土壤含水率随斥水程度增大而减小;斥水黏壤土的残余含水率随着斥水程度增加而减小,
斥水砂土S0~S3 的残余含水率没有差异,S4、S5 的残余含水率显著减小;斥水黏壤土和砂土进气值的对数与斥水剂添
加量呈负线性相关;随着斥水程度增加,田间持水率减小,凋萎系数没有明显差异,重力水增加,有效水和易有效水减
小,易利用水比例随着斥水程度增加而减小;对于斥水黏壤土,微孔隙(0.3~<5 m)和小孔隙(5~<30 m)含量随着
斥水程度的增加明显减小,土壤空隙(≥100 m)随着斥水程度的增加急剧增加;对于斥水砂土,中等孔隙(30~<75 m)
的含量随斥水程度的增加明显增加。该研究成果可为斥水土壤的入渗、蒸发和数值模拟提供理论支持。

Other Abstract

Water repellency is a widespread phenomenon in soils. Almost every soil shows water repellency to some degree. It
may reduce the infiltration in soil and is easy to form finger flow. Therefore, the soil holding capacity of moisture and the yield
of crops are reduced. It’s very important to study the soil water characteristic curve in repellency soils. In this study, we aimed
to explore the impact of repellent levels on soil hydraulic characteristics, clay loam of 7 repellent levels (treatment L0 to L6)
and sand of 6 repellent levels (treatment S0 to S5) made by adding octadecyl primary amine collected from Yangling, Shaanxi.
The experiment was conducted in the Key Laboratory of Agricultural Soil and Water Engineering, Ministry of Education, at
Northwest A&F University in August 2016. Each of the 13 treatments had 4 replicates. Soils were mixed with octadecyl
primary amine which varied from 0 as control and 0.2, 0.3, 0.4, 0.5, 0.6, 0.8 g/kg respectively for clay loam and 0.06, 0.08,
0.09, 0.115, 0.12 g/kg respectively for sand. The repellency level of treatment L0 and S0 was wettable, L1, L2 and S1 was
slight repellent, L3, L4 and S2 were moderate, L5 and S3 were severe, and L6, S4 and S5 were extreme. The soil moisture
characteristic curves were measured with a high speed centrifuge. The van Genuchten (VG) model was fitted to obtain the
hydraulic parameters with RETC software. The results showed that under the same suction, the soil moisture of repellent clay
loam was higher than that of repellent sand and the soil moisture decreased with the increase of repellent levels. The residual
moisture and the shape parameter decreased and the reciprocal of air entry value increased rapidly with increasing the repellent
levels for repellent clay loam. There was no difference in residual moisture of treatment of S0 to S3 for sand, but the residual
moisture of treatment S4 and S5 was lower than the other treatments for repellent sand. The reciprocal of air entry value
increased with increasing the repellent levels for repellent sand. The air entry value decreased with increasing the repellent
levels for both repellent clay loam and sand. There was a significant negative linear correlation between logarithm of air entry
value and the amount of octadecyl primary amine, and the determination coefficient was 0.92 and 0.93 for repellent clay loam
and sand, respectively. There was no difference in wilting coefficient between the treatments for repellent clay loam and sand
respectively. The field capacity, effective water and easily available water decreased with the increase of the repellent levels
for both repellent clay loam and sand. Meanwhile, the gravity water showed a decreasing trend. The results also showed that
there was no difference in the proportion of micropore and macropore while the micro-porosity and porosity decreased with
the increase of water repellency, with increasing the repellent levels for repellent clay loam. The soil voids increased sharply
with the increase of repellent level for repellent clay loam. The micropore did not exist in repellent sand. There was no
difference in the proportion of micropores, macropores and soil voids with the repellent level for repellent sand. The
proportion of small pore of S0 was significantly higher than the other treatments but there’s no difference between S1 to S5.
The proportion of medium porosity increased obviously with the increase of repellent levels for sand. Therefore with the
repellency increase, field capacity, easily available water and micropore of sand decreased, and soil porosity of clay loam
increased. It led the water that crop can absorb reduced. Repellency was unconducive to crops growth. We should try to avoid
the increase in soil water repellency level. This study can provide valuable information for the infiltration, evaporation and
numerical simulation of repellent soil.

Keyword土壤水分 孔隙 脱水 水分特征曲线 斥水
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/361005/8495
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学水利与建筑工程学院
2.西北农林科技大 学水土保持研究所
3.本古里安大学Blaustein 沙漠研究所
Recommended Citation
GB/T 7714
陈俊英,刘畅,张林,等. 斥水程度对脱水土壤水分特征曲线的影响[J]. 农业工程学报,2017,33(21):188-193.
APA 陈俊英,刘畅,张林,向友珍,Leionid Gillerman,&柴红阳.(2017).斥水程度对脱水土壤水分特征曲线的影响.农业工程学报,33(21),188-193.
MLA 陈俊英,et al."斥水程度对脱水土壤水分特征曲线的影响".农业工程学报 33.21(2017):188-193.
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