Effect of Humic Acid on Characteristics of Salt and Water Transport in Coastal Saline-alkali Soil

LI Xiaoju; SHAN Yuyang; WANG Quanjiu; MA Chenguang; YU Le

doi:10.13870/j.cnki.stbcxb.2020.06.040

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Effect of Humic Acid on Characteristics of Salt and Water Transport in Coastal Saline-alkali Soil

更新时间：2025-03-12

- Effect of Humic Acid on Characteristics of Salt and Water Transport in Coastal Saline-alkali Soil
- Vol. 34, Issue 6, Pages: 288-293(2020)
- 作者机构：
  
  1. 西安理工大学西北旱区生态水利工程国家重点实验室,西安,710048
  2. 中科院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.06.040
  CLC： P731.12
- Published：2020
- 稿件说明：
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LI Xiaoju, SHAN Yuyang, WANG Quanjiu, et al. Effect of Humic Acid on Characteristics of Salt and Water Transport in Coastal Saline-alkali Soil[J]. 2020, 34(6): 288-293.
DOI：

LI Xiaoju, SHAN Yuyang, WANG Quanjiu, et al. Effect of Humic Acid on Characteristics of Salt and Water Transport in Coastal Saline-alkali Soil[J]. 2020, 34(6): 288-293. DOI： 10.13870/j.cnki.stbcxb.2020.06.040.

摘要

为了探索腐殖酸对土壤水盐运移特征及入渗参数的影响，进行了5种施量（0，1，3，5，7 g/kg）的一维垂直入渗试验。结果表明，入渗时间相同，累积入渗量和湿润锋均随腐殖酸施量的增加而减小；相同入渗深度随腐殖酸施量的增加所需的入渗时间、累积入渗量、剖面平均含水量均不断增加。入渗完成时相较于CK，施量为7 g/kg时累积入渗量、含水量分别增加8.0%，10.0%；施加腐殖酸可促进土壤剖面盐分向土壤深层运移并有效降低土壤pH，相较于CK施量为7 g/kg时0—20 cm土层平均脱盐率增加10.2%；Philip模型和代数模型能较好地描述施加腐殖酸条件下水分入渗特征。吸渗率S随腐殖酸施加量的增加而呈线性减小，综合形状系数α则随着腐殖酸施量的增加而线性增加。另外，均方根误差、平均绝对误差分别为0.005~0.018，0.004~0.014 cm3/cm3，表明代数模型可以较好地描述含水量的分布。该研究结果可为应用改良剂改良滨海盐碱地的提供一定参考。

Abstract

Coastal saline-alkali land is an important land reserve resource

as well as an important way to ease the pressure on agricultural land. Soil amendments are widely used in soil improvement. Grasping its effect on water movement and salt transport is the first problem for amendment application. In order to explore the effects of humic acid on soil water movement and salt transport characteristics and infiltration parameters

one-dimensional vertical infiltration experiments were performed at five application rates (0

7 g/kg). The results showed that when the infiltration time was same

the cumulative infiltration amount and wetting front of each treatment decreased with the increase of humic acid application; for the same infiltration depth

the infiltration time required with the increase of humic acid application

cumulative infiltration and average water content in the profile increased significantly. Compared with CK

the cumulative infiltration and water contents increased by 8.0% and 10.0% respectively when the application rate was 7 g/kg when infiltration finished; the application of humic acid could promote the migration of salt from the soil profile to the deep soil layer and effectively reduce soil pH

compared with the CK application rate of 7 g/kg

the average desalination rate of 0—20 cm increased by 10.2%. The results showed that Philip and algebraic models could better describe the characteristics of water infiltration under the condition of humic acid application. The permeability (S) decreased with the increase of the amount of humic acid applied

and the overall shape coefficient α increased with the increase of the amount. Between the model parameters and the amount of humic acid had a follow linear relationship. In addition

the root mean square error and the average absolute error were 0.005~0.018

0.004~0.014 cm3/cm3

indicating that the algebraic models could better describe the distribution of water content. The above research results provide a certain reference for the application of amendment in the improvement of coastal saline-alkali land.

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