Adsorption Characteristics and Influence Factors of Dissolved Organic Carbon in Saline-alkali Paddy Fields

TANG Jie; GONG Zhiyu; WANG Jingjing; QU Yunke

doi:10.13870/j.cnki.stbcxb.2020.05.036

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Adsorption Characteristics and Influence Factors of Dissolved Organic Carbon in Saline-alkali Paddy Fields

更新时间：2025-03-12

- Adsorption Characteristics and Influence Factors of Dissolved Organic Carbon in Saline-alkali Paddy Fields
- Vol. 34, Issue 5, Pages: 259-266(2020)
- 作者机构：
  
  吉林大学新能源与环境学院,长春,130000
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2020.05.036
  CLC： X833
- Published：2020
- 稿件说明：
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TANG Jie, GONG Zhiyu, WANG Jingjing, et al. Adsorption Characteristics and Influence Factors of Dissolved Organic Carbon in Saline-alkali Paddy Fields[J]. 2020, 34(5): 259-266.
DOI：

TANG Jie, GONG Zhiyu, WANG Jingjing, et al. Adsorption Characteristics and Influence Factors of Dissolved Organic Carbon in Saline-alkali Paddy Fields[J]. 2020, 34(5): 259-266. DOI： 10.13870/j.cnki.stbcxb.2020.05.036.

摘要

土壤吸附可溶性有机碳（DOC）对土壤有机碳的循环转化有重要影响。为进一步明确田间实际情况下盐碱水田土壤对DOC的吸附规律，选取吉林西部不同盐碱程度的5块水田土壤（P1、P2、P3、P4和P5），采用室内模拟试验，在静止条件下培养70天，模拟研究了土壤在自然状态下对不同浓度DOC的吸附特征，分析了理化性质对DOC最大累积吸附量的影响。结果表明：土壤对DOC的吸附速率在试验初期较快，然后逐渐减弱并达到平衡，Elovich方程可描述土壤对DOC的动力学吸附特征，且适用于土壤对不同浓度DOC的吸附。DOC的等温吸附特征用Freundlich方程拟合效果最好，从方程参数看各样地土壤吸附能力有明显差异，表层吸附能力大于底层。碱化度和pH是影响土壤最大累积吸附量的主要因素；黏粒含量越高的土壤最大累积吸附量越大；有机质促进了土壤对DOC的吸附。研究结果对充分认识DOC在盐碱土壤中迁移转化具有重要意义。

Abstract

Soil adsorption of dissolved organic carbon (DOC) has an important effect on the cycling and transformation of soil organic carbon. In order to make clear the soil adsorption law of DOC in the natural saline-alkali paddy fields

5 paddy fields (P1

P4 and P5) with different saline-alkali degrees in Western Jilin Province were sampled and incubated in the lab for 70 days in a stationary condition. The experiment studied the DOC adsorption characteristics under different solution concentrations and analyzed the effects of physical and chemical properties on DOC maximum cumulative adsorptions. The results showed that the soil adsorption rate was large in earlier period while decreased with time

which could be described by the Elovich equation suitable to DOC adsorption under different solution concentrations. The Freundlich equation

was best fitted with DOC isometric adsorption features

from which the coefficients indicated that adsorption capacity of soils significantly differed from each other and the adsorption capacity of surface soil was greater than the bottom layer. Exchangeable sodium percentage and pH significantly affected DOC maximum cumulative adsorption which increased with the increased content of clay and organic matter. This study was crucial to elucidate the cycling and transformation of DOC on saline-alkali paddy fields.

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