|
Descripción
|
|
|---|---|
| The aim of this work was to study the effects of organic amendments on metal concentration in some hyperaccumulator species and also to investigate the bioavailability and uptake of these metals by plants. Two heavy metal contaminated soils from the north of Madrid Community (Spain) were selected for this study. Three species (Thlaspi arvense, Brassica juncea and Atriplex halimus) were grown under controlled conditions in pots filled with contaminated soils mixed with two different organic amendments: pine bark compost and manure compost. After harvest plants were cut at ground level and stems, leaves and inflorescences of each plant were separated and weighed for fresh and dry weight determination. Also plant height and inflorescence height were measured. Atomic Absorption Spectroscopy (AAS) was employed to determine metal concentrations (Zn, Cu and Cd) in soil and plant samples. Comparing the three species results indicate a higher total metal uptake and metal tolerance in A. halimus than B. juncea and T. arvense. The metal concentration in different parts of the plants was related to the amendment applied. Highest plant metal concentration (Zn, Cu) was observed in pots treated with pine bark amendment and with pure soil due to an increase in metal bioavailability with decreasing pH. Also in those treatments the total plant biomass was lower, even some plants could not germinate. On the contrary, there was a lower metal concentration in plant tissues of pots with manure due to a decrease in metal bioavailability caused by an increasing pH with the addition of this alkaline amendment. In conclusion, results show that the addition of manure compost to metal contaminated soils resulted in a higher biomass production and a lower Cu and Zn concentration in plant tissues. This was probably due to a low metal bioavailability caused by an increasing pH and the contribution of organic matter, that not only reduced metal phytotoxicity but was also a source of nutrients for plants. Moreover, a larger amount of metal was removed from soils when adding this amendment given the higher plant growth. Addition of this type of organic amendment could be effective for stabilization of metals in contaminated soils and for phytoextraction purposes using accumulator plants. In contrast, pine bark amendments did not achieve such results. | |
|
Internacional
|
Si |
|
Nombre congreso
|
8th APGC Symposium Plant Functioning in a Changing Global and Polluted Environment. |
|
Tipo de participación
|
960 |
|
Lugar del congreso
|
Universidad de Groningen |
|
Revisores
|
Si |
|
ISBN o ISSN
|
978-90-367-4982-4 |
|
DOI
|
|
|
Fecha inicio congreso
|
05/06/2011 |
|
Fecha fin congreso
|
09/06/2011 |
|
Desde la página
|
108 |
|
Hasta la página
|
109 |
|
Título de las actas
|
Proceedings of the 8th APGC Symposium Plant Functioning in a Changing Global and Polluted Environment |