秸秆还田对土壤Cd(Ⅱ)吸附-解吸的影响

黄界颍; 伍震威; 徐晓春; 乔策策

doi:10.13961/j.cnki.stbctb.2016.02.025

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秸秆还田对土壤Cd(Ⅱ)吸附-解吸的影响

试验研究

- 秸秆还田对土壤Cd(Ⅱ)吸附-解吸的影响
- Effects of Straw Returning on Adsorption-desorption Characteristics of Cd(Ⅱ) in Soils
- 水土保持通报 2016年36卷第2期页码：129-135
- 作者机构：
  
  1. 安徽农业大学资源与环境学院,安徽,合肥,230036
  2. 安徽省环境监测中心站,安徽,合肥,230061
  3. 合肥工业大学资源与环境工程学院,安徽,合肥,230009
- 作者简介：
- 基金信息：
  
  安徽省自然科学基金项目"秸秆还田对污染土壤DOC和Cd形态及生物有效性的影响机理"(1208085QD76),"安徽铜陵矿山固体废弃物重金属元素的迁移及污染控制"090415204);2014年度安徽农业大学稳定和引进人才科研项目
- DOI：10.13961/j.cnki.stbctb.2016.02.025
  中图分类号：
- 纸质出版：2016
- 稿件说明：
移动端阅览
黄界颍, 伍震威, 徐晓春, 等. 秸秆还田对土壤Cd(Ⅱ)吸附-解吸的影响[J]. 水土保持通报, 2016,36(2):129-135.

HUANG Jieying, WU Zhenwei, XU Xiaochun, et al. Effects of Straw Returning on Adsorption-desorption Characteristics of Cd(Ⅱ) in Soils[J]. Bulletin of Soiland Water Conservation, 2016, 36(2): 129-135.
黄界颍, 伍震威, 徐晓春, 等. 秸秆还田对土壤Cd(Ⅱ)吸附-解吸的影响[J]. 水土保持通报, 2016,36(2):129-135. DOI： 10.13961/j.cnki.stbctb.2016.02.025.

HUANG Jieying, WU Zhenwei, XU Xiaochun, et al. Effects of Straw Returning on Adsorption-desorption Characteristics of Cd(Ⅱ) in Soils[J]. Bulletin of Soiland Water Conservation, 2016, 36(2): 129-135. DOI： 10.13961/j.cnki.stbctb.2016.02.025.

摘要

[目的

]

探讨不同秸秆还田类型及还田水平(水稻、油菜秸秆全量、1/2量)对3种土壤类型﹝沈桥红壤(SQ)、朝山红壤(CS)、新桥水稻土(XQ)﹞Cd(Ⅱ)吸附-解吸行为的影响

为控制土壤中Cd(Ⅱ)环境行为及其调控提供依据。[方法

]

采用室内模拟培养试验和等温吸附相结合的方式。[结果

]

(1) 秸秆还田促进了土壤对Cd(Ⅱ)的吸附

在3种土壤的各处理间差异显著(p

0.05)。在XQ上

秸秆还田处理提升Cd(Ⅱ)吸附量的效果较2种红壤显著

其中

油菜秸秆1/2量还田处理(RP

)、油菜秸秆全量还田处理(RP

)土壤Cd(Ⅱ)吸附量与对照相比分别增加了9.30%和10.47%。对SQ

CS而言

以Langmuir模型的拟合度最佳

Abstract

[Objective] To explore the effects of rice and rapeseed straw returning on the adsorption and desorption characteristics of Cd(Ⅱ) in straw returned soils

such as Shenqiao red soil(SQ)

Chaoshan contaminated red soil(CS)

and Xinqiao paddy soi1(XQ)

the effects of straw kind and straw amount was studied. [Methods] With incubation method

a series of experiments of isothermal adsorption were conducted to compare the impact of straw returning on Cd adsorption and desorption to the three kinds of soils. [Results] (1) The straw returning induced a remarkable increase in the soil absorption of Cd(Ⅱ)

and there were significant differences among different treatments in three kinds soil(p < 0.05). Especially for XQ

returned straw promoted the Cd(Ⅱ) adsorption capacity obviously than that of the red soil. As compared with those of the control

the Cd(Ⅱ) adsorption capacity of total rapeseed straw returning treatment(RP1) and of half rapeseed straw returning treatment increased by 9.30% and 10.47%

respectively. Equations of Freundlich and Langmuir and Temkin all can be used to fit the adsorption isotherms for Cd(Ⅱ) in SQ and CS

but Langmuir equation performed better with a correlation coefficient higher than 0.990 9. While for XQ

the Temkin equation could be better applied to describe the adsorption of irregular surface. (2) In addition

the Cd(Ⅱ) desorption amount and desorption rate in all treatments increased with the Cd(Ⅱ) adsorption increasing. Straw returning reduced the amount of soil Cd(Ⅱ) desorption

in particular

minimum Cd(Ⅱ) desorption of three soils were all found in total rape straw returning treatment. [Conclusion] The impact of straw returning on adsorption-desorption characteristics of Cd(Ⅱ) showed significant differences among different soils

rapeseed straw returning treatments can enhance the specific adsorption of Cd(Ⅱ) and effectively reduce the ecological risk of cadmium.

关键词

Keywords

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