The Phytoextraction of Toxic Metals by Fast Growing Trees in Long Term Field experiment

Phiruny Duong

Diplomová práce

Abstract:

Pollution of heavy metals in soil has become main environmental problems. Phytoextraction is the promising tool to use for cleaning up the environment from contaminants. The phytoextraction by fast growing trees was investigated using the long term contaminated site. The objectives of this study were 1) to evaluate the ability of the uptake and accumulation amount of metals from soil by fast growing trees and 2) to compare the accumulation ability of metals between shorter and longer harvesting periods. For this study, rotation periods of 4 years and 2 years of Salix and Populus clones were set as experimental factor to observe if the rotation length could affect the removal of heavy metals. Two Salix clones (S1- (S. schwerinii × S. viminalis) × S. viminalis), S2 - S. smithiana) and two Populus clones P1 – (P. maximowiczii × P. nigra, P2 – P. nigra) were be investigated from 2016 and harvested in 2020 for 4 years rotation period as well harvested in 2018, and again in 2020 for two 2 years-rotation periods. Fresh harvested biomass was weighed, dried and weighed again for dry biomass. The grounded samples were used to determine the concent of risk elements. The results showed that 4 years-periods had better performance in term of biomass productions and elements removal. Clone that had the best performance was willow S2 due to its high biomass production and high accumulation of heavy metals. Between poplars P1 clone showed higher ability to accumulate metals, than P2. The highest remediation factors were found by S2 with the RF of Cd was 8.39%, Pb was 0.06% and Zn was 3.23% per four-years period. Rotation length did have crucial impact on the removal of concentration whereas, 4 years-rotation is recommended for the efficient removal of Cd and Zn from medium contaminated soil. Phytoextraction of Pb was not successful due to high soil Pb content and low mobility

Keywords

Phytoextraction, Heavy Metals, Willows, Poplars

Jazyk práce: angličtina

Datum vytvoření / odevzdání či podání práce: 26. 4. 2021

Obhajoba závěrečné práce

• Vedoucí: prof. Ing. Pavel Tlustoš, CSc. dr. h. c.

Česká zemědělská univerzita v Praze

Fakulta agrobiologie, potravinových a přírodních zdrojů

Magisterský studijní program / obor:
Natural Resources and Environment / Natural Resources and Environment