Biochar applications combined with paddy-upland rotation cropping systems benefit the safe use of PAH-contaminated soils: From risk assessment to microbial ecology

被引：39

作者：

Ni, Ni ^{[1
,2
,3
]}

Li, Xiaona ^{[2
,5
]}

Yao, Shi ^{[2
,5
]}

Shi, Renyong ^{[4
,5
]}

Kong, Deyang ^{[1
,3
]}

Bian, Yongrong ^{[2
,5
]}

Jiang, Xin ^{[2
,5
]}

Song, Yang ^{[2
,5
]}

机构：

[1] Nanjing Inst Environm Sci, Minist Ecol & Environm Peoples Republ China, Nanjing 210042, Peoples R China

[2] Chinese Acad Sci, Inst Soil Sci, CAS Key Lab Soil Environm & Pollut Remediat, 71 East Beijing Rd, Nanjing 210008, Peoples R China

[3] Minist Ecol & Environm Peoples Republ China, Key Lab Pesticide Environm Assessment & Pollut Co, Nanjing 210042, Peoples R China

[4] Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

[5] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2021年 / 404卷

基金：

中国国家自然科学基金;

关键词：

Paddy-upland rotation cropping; Continuous upland cropping; Biochar; Microbial ecology; Human health risk; POLYCYCLIC AROMATIC-HYDROCARBONS; ARBUSCULAR MYCORRHIZAL; BACTERIAL COMMUNITIES; HEAVY-METALS; FERTILIZATION; DEGRADATION; RHIZOSPHERE; MANAGEMENT; EXPOSURE; BIOACCUMULATION;

D O I：

10.1016/j.jhazmat.2020.124123

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study aimed to establish a method allowing the safe use of polycyclic aromatic hydrocarbon (PAH)contaminated soils through the combination of biochar applications and different cropping systems. The impact of biochar applications under different cropping systems on the human health risks of PAHs and soil microbiology was elucidated. The residual PAHs were the lowest in rhizosphere soils amended with 2% corn straw derived biochar pyrolyzed at 300 degrees C (CB300) under the paddy-upland rotation cropping (PURC) system. Human health risks resulting from the ingestion of PAH-contaminated carrot roots / rice grains under the PURC system were significantly lower than those under continuous upland cropping systems. The greatest diversity, richness and network complexity of soil microbial communities occurred under the PURC system combined with the 2% CB300 treatment. Soil microbial functions associated with soil health and PAH biodegradation were enhanced under this strategy, while the pathogen group was inhibited. Primarily owing to its high sorption capacity, bamboo-derived biochar pyrolyzed at 700 degrees C realized in the reduction of PAHs, but weakly influenced shifts in soil microbial communities. Overall, the combination of PURC systems and low-temperature-pyrolyzed nutrient-rich biochar could efficiently reduce the human health risks of PAHs and improve soil microbial ecology in agricultural fields.

引用

页数：9