Characteristics of organo-mineral complexes in contaminated soils with long-term biochar application

被引：51

作者：

Quan, Guixiang ^{[1
,5
]}

Fan, Qinya ^{[1
,2
]}

Sun, Jianxiong ^{[1
,2
]}

Cui, Liqiang ^{[1
]}

Wang, Hailong ^{[3
,4
]}

Gao, Bin ^{[5
]}

Yan, Jinlong ^{[1
]}

机构：

[1] Yancheng Inst Technol, Sch Environm Sci & Engn, Yancheng 224051, Peoples R China

[2] Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212013, Jiangsu, Peoples R China

[3] Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Guangdong, Peoples R China

[4] Zhejiang A&F Univ, Sch Environm & Resource Sci, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Zhejiang, Peoples R China

[5] Univ Florida, Dept Agr & Biol Engn, Gainesville, FL 32611 USA

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2020年 / 384卷

基金：

中国国家自然科学基金;

关键词：

Biochar; Soil remediator; Organo-mineral complexes; Combined forms of humus; Vertical migrations; BLACK CARBON; AMENDMENT; MATTER;

D O I：

10.1016/j.jhazmat.2019.121265

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Long-term studies on the environmental effects following biochar additions to soils, while plentiful, are predominantly focused on the soil fertility, whereas few are on the soil organo-mineral complexes. This study examines the changes of organo-mineral complexes in an acidic paddy soil and a saline-alkali soil which were remediated using biochar for approximately 8 years and 3 years, respectively. The results showed that loosely combined humus increased by 30.1% and 25.1% with the application of 40 t ha(-1) biochar in the acidic paddy soil and the saline-alkali soil, respectively. Meanwhile, an increase of cement (Fe-oxides) was the contributor to the rise of the complexes content. Complex iron in the saline-alkali soil were 30% higher than in the acidic paddy soil with the application of 40 t ha(-1) biochar. Fourier Transform Infrared Spectroscopy showed oxygen-containing functional groups on the surface of the biochar separated from the remediated field. X-ray diffraction analysis indicated that both complexation and sedimentation were involved in heavy metal immobilization. It was found that biochar amendment mitigated the effect of acid rain leaching and reduced vertical migration of the Fe/Al-bound complex, which can prevent soil from podzolization and thus improve its fertility.

引用

页数：7