Erinevate tuhatöötluste mõju hariliku kuuse kasvule
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Kuupäev
2025
Kättesaadav alates
10.09.2025
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Eestit katavad sood umbes 22,3% maismaa pindalast, nende kuivendamine ning turbatootmisest mahajäetatud freesväljakud mõjutavad oluliselt keskkonda. Puitbiomassi kasutatavates koostootmisjaamades jäätmena tekkiv toitainerikas puutuhk sobib oma omadustelt taimekasvu parandavaks väetiseks. Magistritöö eesmärk oli uurida puutuhaga väetamise mõju hariliku kuuse kasvule ammendatud freesturbaväljadel Ulilas ja Pindis. Katsealadel analüüsiti kuuse kasvunäitajaid ning turba keemilist koostist erinevate tuhakoguste lisamisel. Tulemused näitasid, et puutuhaga väetamine parandas oluliselt kuuskede kõrguskasvu ja juurekaela diameetrit, eriti puutuha10 t/ha koguse korral, muutes turba pH-d ja toitainesisaldust taimede kasvuks soodsamaks. Suurem tuhahulk kogusega 15 t/ha ei andnud täiendavat kasvuefekti. Turba pH ja toitainete sisaldus turbas mõjutasid puude kasvu märkimisväärselt. Kontrollaladel esines kuuskedel toitainevaegus ning taimede suremus oli kõrge. Kuuskede kasvule avaldasid mõju ka ilmastikutingimused: statistiline analüüs kinnitas töötluste vahel olulisi erinevusi alates viiendast kasvuaastast. Töös saadud tulemused on aluseks puutuha kasutamisel jääksoode metsastamisel.
About 22.3% of Estonia’s land area is covered by peatlands, their drainage and peat production impact significantly the environment, while wood ash from biomass heating power plants remains production of a large amount of nutrient-rich wood ash. The aim of this master’s thesis was to investigate the effect of wood ash fertilization on the growth of Norway spruce (Picea abies) on exhausted milled peat extraction sites in Ulila and Pindi. Growth indicators of spruce and the chemical composition of peat were analyzed under different ash application rates. The results showed that wood ash fertilization significantly improved spruce height growth and root collar diameter, especially at a moderate dose of 10 t/ha, by increasing peat pH and nutrient availability. Higher ash dose 15 t/ha did not provide additional growth benefits. Peat pH and nutrient content had a significant effect on growth. On control plots, nutrient deficiencies and high mortality of trees were observed. Weather conditions also influenced spruce growth: statistical analysis confirmed significant differences between treatments starting from the fifth growing season. The study provides a basis for optimizing the use of wood ash in afforestation of abandoned peatlands.
About 22.3% of Estonia’s land area is covered by peatlands, their drainage and peat production impact significantly the environment, while wood ash from biomass heating power plants remains production of a large amount of nutrient-rich wood ash. The aim of this master’s thesis was to investigate the effect of wood ash fertilization on the growth of Norway spruce (Picea abies) on exhausted milled peat extraction sites in Ulila and Pindi. Growth indicators of spruce and the chemical composition of peat were analyzed under different ash application rates. The results showed that wood ash fertilization significantly improved spruce height growth and root collar diameter, especially at a moderate dose of 10 t/ha, by increasing peat pH and nutrient availability. Higher ash dose 15 t/ha did not provide additional growth benefits. Peat pH and nutrient content had a significant effect on growth. On control plots, nutrient deficiencies and high mortality of trees were observed. Weather conditions also influenced spruce growth: statistical analysis confirmed significant differences between treatments starting from the fifth growing season. The study provides a basis for optimizing the use of wood ash in afforestation of abandoned peatlands.
Kirjeldus
Magistritöö
Metsamajanduse ja metsaökoloogia õppekaval
Märksõnad
magistritööd, Picea abies, puutuhk, mahajäetud turbaalad, turbakeemia, ilmastik