Põlevkivituha ning põlevkivi- ja puutuha segu mõju arukase (Betula pendula Roth) biomassi formeerumisele ammendatud freesturbaväljal
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Kuupäev
2017
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Eestis on põlevkivi põhiline energiaallikas elektri tootmisel, kuid põlevkivi põletamisel tekib
miljoneid tonne tuhka, mis siiani pole märkimisväärset kasutust leidnud ja ladustatakse
tuhaväljadele. Põlevkivituhk sisaldab taimedele vajalikke toitaineid, mida saab edukalt
taaskasutada põllumajanduses ja metsanduses. Antud töö eesmärgiks oli selgitada
põlevkivituha ning põlevkivi- ja puutuha segu kasutusvõimalusi väetisena ammendatud
freesturbaaladel. Katseala asub Puhatu ammendatud freesturbaväljal ja istutusmaterjaliks
valiti arukase (Betula pendula Roth) 1-aastased potitaimed. Katsealal mõõdeti puude
kasvuparameetrid, tehti turba- ja tuhaanalüüsid ning saadud tulemusi võrreldi kontrollala
näitajatega. Kontrollalaga võrreldes olid kõik mõõdetud parameetrid väetatud aladel
suuremad. Väetamise tagajärjel muutus mulla reaktsioon neutraalsema suunas. Samuti on
väetatud aladel fosfori ja kaaliumi sisaldus turbas oluliselt suurem.
Põlevkivituha ning puu- ja põlevkivituha seguga väetamine mõjub jääksoos positiivselt
puude assimilatsiooniorganite kasvule ja pindalale. Ilmnes, et kõige intensiivsem on kaskede
biomassi formeerumine segutuhaga töödeldud aladel. Katse tulemused näitavad, et
põlevkivi- ja puutuha segu kasutamine väetisena ammendatud freesturbaaladel on
perspektiivne. Antud teema on aktuaalne, sest Eesti Keskkonnastrateegia 2030 üks
prioriteete on soodustada tootmisjääkide taaskasutamist ja jäätmetega saastatud alade
vähendamist.
Oil shale is main energy resource in Estonia and after usage in power plants, millions of tons of oil shale ash is deposited on oil shale ash fields. Oil shale ash contains multiple elements that are needed for plants growth and can be reused in agriculture and forestry management. The aim of the thesis was to investigate the effect of fertilisation with oil shale ash and a mixture of wood ash and oil shale ash on the biomass formation of silver birch on a cutaway peatland. The study area is located on Puhatu cutaway peatland and experiments were conducted with 1-year-old seedlings of silver birch (Betula pendula Roth). On the study area growth parameters were measured, the peat and ash analysis were made and the results were compared to control plots. The results of the trees that grew on the treated plots showed better results comparing to trees from the control plots. After fertilisation acidic peat soils were more neutral. In the plots treated there was a considerable increase in the concentrations of P and K. After fertilization with oil shale ash and mixture of oil shale ash and wood ash on cutaway peatland there was positive effect on biomass formation and area of assimilation organs. The experiment shows that the use of mixture of oil shale ash and wood ash on a cutaway peatland has a positive effect on the assimilation organs growth of trees. Results of this work showed, that the most intensive silver birch biomass formation is on the substrate fertilised with mixture of oil shale ash and wood ash. The given thesis has long-term aspect and is topical because of the Estonian Environmental Strategy 2030 where the first priority is to promote the reuse of manufacturing waste and reduce waste polluted areas.
Oil shale is main energy resource in Estonia and after usage in power plants, millions of tons of oil shale ash is deposited on oil shale ash fields. Oil shale ash contains multiple elements that are needed for plants growth and can be reused in agriculture and forestry management. The aim of the thesis was to investigate the effect of fertilisation with oil shale ash and a mixture of wood ash and oil shale ash on the biomass formation of silver birch on a cutaway peatland. The study area is located on Puhatu cutaway peatland and experiments were conducted with 1-year-old seedlings of silver birch (Betula pendula Roth). On the study area growth parameters were measured, the peat and ash analysis were made and the results were compared to control plots. The results of the trees that grew on the treated plots showed better results comparing to trees from the control plots. After fertilisation acidic peat soils were more neutral. In the plots treated there was a considerable increase in the concentrations of P and K. After fertilization with oil shale ash and mixture of oil shale ash and wood ash on cutaway peatland there was positive effect on biomass formation and area of assimilation organs. The experiment shows that the use of mixture of oil shale ash and wood ash on a cutaway peatland has a positive effect on the assimilation organs growth of trees. Results of this work showed, that the most intensive silver birch biomass formation is on the substrate fertilised with mixture of oil shale ash and wood ash. The given thesis has long-term aspect and is topical because of the Estonian Environmental Strategy 2030 where the first priority is to promote the reuse of manufacturing waste and reduce waste polluted areas.
Kirjeldus
Bakalaureusetöö
Loodusvarade kasutamise ja kaitse õppekava
Märksõnad
bakalaureusetööd, arukask, ammendatud freesturbaalad, põlevkivituhk, puutuhk