Plant growth and metal uptake by a non-hyperaccumulating species (Lolium perenne) and a Cd-Zn hyperaccumulator (Noccaea caerulescens) in contaminated soils amended with biochar
métal
cadmium
sol contamine
[SDV]Life Sciences [q-bio]
phytoremediation
ph du sol
soil alkalinity
plomb
Nutrient deficiency
Noccaea caerulescens
2. Zero hunger
lead
soil pollution
perennial ryegrass
zinc
04 agricultural and veterinary sciences
15. Life on land
pollution du sol
lolium pérenne
bioremédiation
biodisponibilité des polluants
Biochar
Biomass production
Hyperaccumulation
0401 agriculture, forestry, and fisheries
absorption
nutriment du sol
plante hyperaccumulatrice de métaux
DOI:
10.1007/s11104-015-2384-x
Publication Date:
2015-01-26T22:08:40Z
AUTHORS (4)
ABSTRACT
Biochar could be used as a soil amendment in metal contaminated soils, for safe crop production or soil remediation purposes. This work was conducted to study the effects of biochar amendments on metal uptake by two contrasted plants grown on metal-contaminated soils. A non-hyperaccumulating plant (Lolium perenne) and a Cd- and Zn-hyperaccumulator (Noccea caerulescens) were grown in pots on acidic (A) and alkaline (B) soil contaminated by Cd, Pb and Zn, both amended by a wood-derived biochar. Biochar amendments decreased the availability of metals by increasing soil pH, but also decreased Ca, P and N availability. Growth of L. perenne was increased and shoot metal uptake decreased by biochar addition in both soils, although increasing biochar dose above 0.5 % resulted in a progressive decrease of shoot production on soil B. Growth of N. caerulescens was not significantly affected by biochar. But an increase of Cd uptake with 5 % biochar was recorded on both soils, and of Zn uptake on soil B. Beside immobilizing metals, biochar may decrease the availability of nutrients, leading either to plant deficiency or to a decreased competition with cations for metal uptake, thus enhancing extraction of metals by hyperaccumulators.
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