2 research outputs found
Cadmium availability in soil and retention in oak roots: potential for phytostabilization
No full text7 pages, 3 figures, 4 tables, 58 references.Afforestation of contaminated land by trees is considered as a feasible strategy for the extensive stabilization
of contaminants. In this work, we studied the patterns of metal availability (Cd, Cu, Pb and Zn) in a
contaminated and afforested area. Specifically, we observed the response of Holm oak (Quercus ilex subsp.
ballota) leaves to changes in the availability of metals under field conditions, focusing on Cd. Under controlled
conditions we studied the performance of oak seedlings exposed to high levels of Cd, with the aim
of analyzing the patterns of translocation and tolerance of the seedlings. Cadmium was the most available
metal, in relative terms; 15% of the total Cd in the soil was extracted with NH4NO3. The availabilities of
Cd, Cu and Zn showed exponential relationships with soil pH (pH values ranged from 2.4 to 8.4). Cadmium
accumulation in the leaves was not related to the changes in Cd availability. Greenhouse studies
showed that seedlings had a high Cd retention capacity in fine roots (up to 7 g kg 1) and low rates of
Cd translocation to the leaves (transfer coefficients below 0.03). Root biomass and thickness was altered
by exposure to Cd. In spite of this, the chlorophyll fluorescence measurements (an indicator of plant
stress) only differed slightly from the control treatment at a Cd dose of 200 mg L 1. Due to the relatively
high tolerance to Cd and the capacity of roots to retain this metal, Holm oak may be useful for the phytostabilization
of soils contaminated by Cd.We acknowledge the Regional Ministry of the Environment
(Junta de AndalucÃa) for supporting this study within the SECOVER
research program. We also thank the Spanish Ministry of Education
for a FPU grant awarded to M.T. DomÃnguez and the project Interbos
(CGL2008-04503-C03-01).Peer reviewe
Cadmium availability in soil and retention in oak roots: potential for phytostabilization
No full text7 pages, 3 figures, 4 tables, 58 references.Afforestation of contaminated land by trees is considered as a feasible strategy for the extensive stabilization
of contaminants. In this work, we studied the patterns of metal availability (Cd, Cu, Pb and Zn) in a
contaminated and afforested area. Specifically, we observed the response of Holm oak (Quercus ilex subsp.
ballota) leaves to changes in the availability of metals under field conditions, focusing on Cd. Under controlled
conditions we studied the performance of oak seedlings exposed to high levels of Cd, with the aim
of analyzing the patterns of translocation and tolerance of the seedlings. Cadmium was the most available
metal, in relative terms; 15% of the total Cd in the soil was extracted with NH4NO3. The availabilities of
Cd, Cu and Zn showed exponential relationships with soil pH (pH values ranged from 2.4 to 8.4). Cadmium
accumulation in the leaves was not related to the changes in Cd availability. Greenhouse studies
showed that seedlings had a high Cd retention capacity in fine roots (up to 7 g kg 1) and low rates of
Cd translocation to the leaves (transfer coefficients below 0.03). Root biomass and thickness was altered
by exposure to Cd. In spite of this, the chlorophyll fluorescence measurements (an indicator of plant
stress) only differed slightly from the control treatment at a Cd dose of 200 mg L 1. Due to the relatively
high tolerance to Cd and the capacity of roots to retain this metal, Holm oak may be useful for the phytostabilization
of soils contaminated by Cd.We acknowledge the Regional Ministry of the Environment
(Junta de AndalucÃa) for supporting this study within the SECOVER
research program. We also thank the Spanish Ministry of Education
for a FPU grant awarded to M.T. DomÃnguez and the project Interbos
(CGL2008-04503-C03-01).Peer reviewe
