Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 168, Issue -, Pages 245-251Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2015.12.019
Keywords
Cadmium; Lead; Biochar; NH4NO3-extractable Cd; NH4NO3-extractable Pb
Categories
Funding
- National Key Technologies R&D Program of China [2015BAD05B02]
- National Agro-Industry Technology Research System for Crops of Bast and Leaf Fiber [CARS-19]
- National Natural Science Foundation of China [41371318]
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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. (C) 2015 Elsevier Ltd. All rights reserved.
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