淋溶条件下低分子量有机酸对淋出液及三峡库区典型土壤性质的影响

杨茜; 卢越琴; 马玲莉; 魏世强

doi:10.13961/j.cnki.stbctb.20160520.001

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淋溶条件下低分子量有机酸对淋出液及三峡库区典型土壤性质的影响

水保监测与应用技术

- 淋溶条件下低分子量有机酸对淋出液及三峡库区典型土壤性质的影响
- Effects of Low-Molecular-Weight Organic Acids on Leachate and Soil Properties of Typical Soils Under Leaching Condition in Three Gorge Reservoir Areas
- 水土保持通报 2016年36卷第4期页码：175-181
- 作者机构：
  
  1. 西南大学资源环境学院重庆市农业资源与环境研究重点实验室三峡库区生态环境教育部重点实验室,重庆,400716
  2. 自贡市环境监测中心站,四川,自贡,643000
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目“三峡库区消落带土壤磷素源-汇转换功能与风险评价”（41171198）;水体污染控制与治理科技重大专项（2012ZX07104-003）
- DOI：10.13961/j.cnki.stbctb.20160520.001
  中图分类号：
- 纸质出版：2016
- 稿件说明：
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杨茜, 卢越琴, 马玲莉, 等. 淋溶条件下低分子量有机酸对淋出液及三峡库区典型土壤性质的影响[J]. 水土保持通报, 2016,36(4):175-181.

YANG Xi, LU Yueqin, MA Lingli, et al. Effects of Low-Molecular-Weight Organic Acids on Leachate and Soil Properties of Typical Soils Under Leaching Condition in Three Gorge Reservoir Areas[J]. Bulletin of Soiland Water Conservation, 2016, 36(4): 175-181.
杨茜, 卢越琴, 马玲莉, 等. 淋溶条件下低分子量有机酸对淋出液及三峡库区典型土壤性质的影响[J]. 水土保持通报, 2016,36(4):175-181. DOI： 10.13961/j.cnki.stbctb.20160520.001.

YANG Xi, LU Yueqin, MA Lingli, et al. Effects of Low-Molecular-Weight Organic Acids on Leachate and Soil Properties of Typical Soils Under Leaching Condition in Three Gorge Reservoir Areas[J]. Bulletin of Soiland Water Conservation, 2016, 36(4): 175-181. DOI： 10.13961/j.cnki.stbctb.20160520.001.

摘要

[目的] 研究低分子量有机酸（草酸、柠檬酸、酒石酸）作用下淋出液及土壤（紫色潮土和灰棕紫泥）性质的变化，以期为三峡库区的环境管理提供参考和科学依据。[方法] 采用间歇式土柱模拟试验进行研究。[结果] 高浓度低分子量有机酸（≥50mmol/L）能够破坏灰棕紫泥的酸碱缓冲体系，当草酸、柠檬酸和酒石酸浓度≥50mmol/L时，灰棕紫泥土壤pH值均从8左右降到了4.11以下；而紫色潮土的缓冲性能较强，经淋溶后土壤pH值变化不大，仍然维持在6.84~8.71左右，与空白处理差异性不显著。另外，灰棕紫泥淋出液电导率变化较紫色潮土明显，高浓度低分子量有机酸处理下，灰棕紫泥淋出液电导率最高值达到了34.400mS；灰棕紫泥在3种低分子量有机酸淋洗下淋溶出离子量的大小顺序为：柠檬酸>酒石酸>草酸。[结论] 低分子量有机酸的酸解作用和络合作用是影响淋出液pH值、淋出液电导率和土壤pH值变化的主要原因，并能够参与紫色潮土和灰棕紫泥的化学和生物化学过程。低分子量有机酸的存在对三峡库区水环境恶化存在一定的风险。

Abstract

[Objective] To provide references and scientific bases for environmental management of the Three Gorges Reservoir areas

the effect of three simple organic acids(oxalic acid

citric acid

tartaric acid) on the properties of leachate and soil(purple soil and grey-brown purple soil) were investigated. [Methods] leaching experiments were conducted using intermittent soil column in lab. [Results] Low-molecular-weight organic acids at high concentration(≥50 mmol/L) can upset the acid-alkaline buffer system of grey-brown purple soil. Either oxalic acid

citric acid or tartaric acid

when the concentration was higher than 50 mmol/L

pH value of grey-brown purple soil was observed declined from around 8 to lower than 4.11. Whereas

the buffer effect of purple soil behaved strong. soil pH value of it varied between 6.84 and 8.71 after leaching

no significant differences were observed with the contrast value of blank treatment. Electrical conductivity of grey-brown purple changed more obviously than the one of purple soil. In the treatments of high concentrations of low-molecular-weight organic acids

the highest electrical conductivity of grey-brown purple soil even reached 34.400 mS. The leached amount of ions by the three acids had a rank of citric acid>tartaric acid>oxalic acid. [Conclusion] The main reasons affecting pH value

electrical conductivity of leachate and soil pH value were acid splitting and complexing action of the low-molecular-weight organic acid. Meanwhile

the acid-participated chemical and biochemical processes of the purple soil and grey-brown purple soil were also important. The presence of low-molecular-weight organic acids has certain risk to water environment in the Three Gorge Reservior areas.

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