master's thesis
Fitoremedijacija kadmija i žive iz tla pomoću trave Miscanthus x giganteus

Kristina Knez (2016)
Sveučilište u Zagrebu
Agronomski fakultet
Metadata
TitleFitoremedijacija kadmija i žive iz tla pomoću trave Miscanthus x giganteus
AuthorKristina Knez
Mentor(s)Željka Zgorelec (thesis advisor)
Abstract
Zagađenje poljoprivrednih tala teškim metalima, kao i drugi oblici degradacije tla, postaju sve veći problem u modernoj poljoprivredi, ali i očuvanju okoliša u cjelini. Kemijski i fizikalni tretmani tla uzrokuju ireverzibilne promjene tla, uništavaju biološku raznolikost, uspješni su u vraćanju gotovo svih uloga tla, osim uloge tla kao supstrata za uzgoj bilja. Zbog toga se javila težnja za razvojem tehnologija kojima bi se mogla povratiti proizvodna uloga tla bez da se utječe na plodnost tla. Jedna od takvih metoda je fitoremedijacija, metoda koja koristi biljke koje uklanjanju, stabiliziraju ili degradiraju teške metale u tlu. Stoga je cilj ovoga rada bio istražiti mogućnost fitoremedijacije kadmija i žive iz tla pomoću Miscanthus x giganteus, koja je ujedno kultura za proizvodnju energije. Posađeni su rizomi trogodišnjeg M. x giganteus u vegetacijskoj godini 2014./2015. Eksperimentalni dizajn je postavljen prema slučajnom bloknom rasporedu, a tretmani su se međusobno razlikovali po koncentracijama Cd (0, 10 i 100 mg/kg tla) i Hg (0, 2 i 20 mg/kg tla) dodanih u tlo. Pretpostavilo se da će Miscanthus koji će izrasti na tlu s različitim dozama onečišćenja Cd i Hg različito reagirati na kvalitetu i kvantitetu biomase te da će različito akumulirati Cd i Hg. Tlo korišteno u istraživanju je praškasto - ilovaste teksture, kisele reakcije (pHKCl=5,12) i slabo humozno (OM=2,26 %). Vrijednosti prinosa kretale su se od 13,6 t/ha u godini (L2) do 20,4 t/ha u godini (C) i nisu bile signifikantno različite između tretmana. Koncentracija Cd u biljci kretala se od 45,47 μg/kg (C) do 69,11 μg/kg (L2), a koncentracija Hg od 8,68 μg/kg (C) do 11,44 μg/kg (L2) i vrijednosti između tretmana su bile signifikantno različite (p<0,005). M. x giganteus se nije pokazao kao najprikladniji izbor za fitoekstrakciju Cd i Hg jer je po hektaru u godini iznošenje nadzemnom biomasom (ili prinosom) bilo 0,81 g Cd (L2) do 1,33 g Cd (L1 + SS) i 0,15 g Hg (L2) do 0,22 g Hg (L1 + SS). Prema izračunatom koeficijentu obogaćivanja (EC) koji se za Cd kretao od 0,382 (C) do 0,581 (L2), a za Hg od 0,132 (C i L1) do 0,173 (L2) zaključujemo da je M. x giganteus umjereni akumulator Cd i Hg, a potencijal ekstrakcije drugih teških metala potrebno je istražiti. Dobiveni podaci pokazali su kako je Miscanthus kao vrijedan energetski usjev potencijalan kandidat za proces fitostabilizacije i proizvodnje biomase na tlima kontaminiranim s Cd i Hg.
Keywordspollution of agricultural soils heavy metals phytostabilization enrichment coefficient
Committee MembersŽeljka Zgorelec (committee chairperson)
Aleksandra Bensa (committee member)
Ivica Kisić (committee member)
Nikola Bilandžija (committee member)
GranterSveučilište u Zagrebu
Agronomski fakultet
PlaceZagreb
StateCroatia
Scientific field, discipline, subdisciplineBIOTECHNICAL SCIENCES
Agronomy
Study programme typeuniversity
Study levelgraduate
Study programmeAgroecology
Academic title abbreviationmag. ing. agr.
Genremaster's thesis
Language Croatian
Defense date2016-09-29
Parallel abstract (English)
Pollution of agricultural soils with heavy metals, along with other forms of degradation, is becoming an increasingly bigger problem in modern agriculture, but also in preserving the environment as a whole. Chemical and physical treatments are useful in returning almost all functional roles of soil, except as a supstrate for plant growth. There is a need for new, less expensive technologies which could return its functional roles, without affecting fertility. Such method is phytoremediation, which uses plants that remove, stabilize or degrade heavy metals in soil. The aim of this paper was to phytostabilization of cadmium and mercury from soil with Miscanthus x giganteus. Three years old rhizomes of M. x giganteus were planted in vegetative year 2014./1015. Experiment was set up as a randomized complete block design and the treatments varied in concentrations of Cd (0, 10 i 100 mg/kg soil) and Hg (0, 2 i 20 mg/kg soil) added to the soil. It was assumed that plants grown on soil with different levels of Cd and Hg will react differently, in terms of biomass quality and quantity, and that they will accumulate them differently. Soil texture is silty, with acid pH value (pHKCl=5,12) and weakly humid (OM=2,26 %). Yield values ranged from 13.6 (L2) to 20.4 (C) t/ha per year and were not significantly different between treatments. Concetration of Cd in the plant varied from 45.47 (C) to 69.11 (L2) μg/kg, Hg varied from 8.68 (C) to 11.44 (L2) μg/kg and values between treatments were significantly different (p<0,005). M. x giganteus is not the best choice for phytoextraction of Cd and Hg, because it accumulated only 0.81(L2) to 1.33 (L1 + SS) g of Cd and 0.15 (L2) to 0.22 (L1 + SS) g of Hg per hectare per year in above biomass. According to the calculated enrichment coefficient, which ranged from 0.382 (C) to 0.581 (L2) for Cd and from 0.132 (C i L1) to 0.173 (L2) for Hg, it can be concluded that M. x giganteus is a moderate accumulator of Cd and Hg and its potential for extraction of other metals needs to be researched. Acquired data has shown that Miscanthus, as a valuable energy crop, is a potential candidate for the process of phytostabilization and biomass production on soils contaminated with Cd and Hg.
Parallel keywords (Croatian)zagađenje poljoprivrednih tala teški metali fitostabilizacija koeficijent obogaćivanja
Resource typetext
Access conditionAccess restricted to students and staff of home institution
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:204:832361
CommitterValentina Bezek