Phytoavailability of Cd and Pb in crop straw biochar-amended soil is related to the heavy metal content of both biochar and soil.

Abstract:

:Crop straw biochar incorporation may be a sustainable method of amending soil, but feedstock-related Cd and Pb content is a major concern. We investigated the effects of heavy metal-rich (RC) and -free biochar (FC) on the phytoavailability of Cd and Pb in two acidic metalliferous soils. Biochar significantly increased soil pH and improved plant growth. Pb in soil and plant tissues significantly decreased after biochar application, and a similar pattern was observed for Cd after FC application. RC significantly increased NH4NO3-extractable Cd in both lightly contaminated (YBS) and heavily contaminated soils (RS). The Cd content of plants grown on YBS increased, whereas it decreased on RS. The Cd and Pb input-output balance suggested that RC application to YBS might induce a soil Cd accumulation risk. Therefore, identifying heavy metal contamination in biochar is crucial before it is used as a soil amendment.

journal_name

J Environ Manage

authors

Shen X,Huang DY,Ren XF,Zhu HH,Wang S,Xu C,He YB,Luo ZC,Zhu QH

doi

10.1016/j.jenvman.2015.12.019

subject

Has Abstract

pub_date

2016-03-01 00:00:00

pages

245-51

eissn

0301-4797

issn

1095-8630

pii

S0301-4797(15)30434-5

journal_volume

168

pub_type

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