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Comparable effects of manure and its biochar on reducing soil Cr bioavailability and narrowing the rhizosphere extent of enzyme activities

Environment International. 2020;134

 

Journal Homepage

Journal Title: Environment International

ISSN: 0160-4120 (Print)

Publisher: Elsevier

LCC Subject Category: Geography. Anthropology. Recreation: Environmental sciences

Country of publisher: United Kingdom

Language of fulltext: English

Full-text formats available: PDF, HTML

 

AUTHORS


Shibin Liu (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), 1# Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China; College of Earth Sciences, Chengdu University of Technology, 1#Dongsanlu, Erxainqiao, Chengdu 610059, Sichuan, PR China)

Shengyan Pu, PhD (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), 1# Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China; State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, PR China; Corresponding author at: State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), Chengdu 610059, PR China.)

Daili Deng (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), 1# Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China)

Hongyan Huang (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), 1# Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China)

Chun Yan (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), 1# Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China)

Hui Ma (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), 1# Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej, 401871 Frederiksberg, Denmark)

Bahar S. Razavi (Department of Soil Science and Plant Nutrition, University of Kiel, Kiel, Germany)

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 12 weeks

 

Abstract | Full Text

Chromium (Cr) contamination is especially hazardous to soil biota. Application of manure and biochar has been frequently proposed to remediate Cr-contaminated soil. However, the understanding of mechanisms behind manure and biochar impacts on soil enzyme activities requires advanced visualization technologies. For the first time, we compared manure and its biochar influence on the spatial distribution of β-glucosidase, N-acetyl-glucosaminidase and phosphomonoesterase activities in Cr-contaminated soil using direct zymography. Maize was planted for 45 days in (a) soil mixed with manure, (b) soil mixed with manure-derived biochar and (c) soil without any addition. Soil pH decreased over 45 days, inducing an increase in acid soluble Cr. The concomitant decrease in β-glucosidase and N-acetyl-glucosaminidase activities explained the narrowing rhizosphere extent of enzyme activities by 13–44%, indicating that increased Cr bioavailability decreases microbial activities. A larger maize performance index and the greatest plant shoot/root ratio after biochar application suggested enhanced maize growth (p < 0.05). In contrast, manure induced the narrowest extent of β-glucosidase and phosphomonoesterase activities due to the addition of labile organic compounds and nutrients following its application. Our study emphasizes the importance of pH on Cr bioavailability and enzyme activities and demonstrates that biochar application is more ideally suited for remediating Cr-contaminated soil. Keywords: Soil zymography, Heavy metal, Soil contamination, Enzyme activities, Manure, Biochar, Rhizosphere