Puutuha mõju arukase (Betula pendula Roth.) kasvule Pindi ammendatud freesturbaväljal
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Kuupäev
2015
Kättesaadavus
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Eestis on rekultriveerimata freesturbaväljakuid ligikaudu 10 000 ha. Jääksoo ei seo õhust
süsinikdioksiidi ja selle talletamist turbasse ei toimu, vastupidiselt looduslikule soole, mis on
peamine süsihappegaasi siduja. Ammendatud freesturbaväljad on Eestis suurimad
kasvuhoonegaaside allikad. Jääksoos ei taastu taimkate väga pika aja jooksul, kuna on
eemaldatud toitainerikas pealmine turba kiht ning soole iseloomulikud taimed on hävinud ja
niiskusrežiim rikutud. Üks perspektiivikas jääksoode rekultiveerimise viis on metsastamine.
Turbapinnase toitaine sisalduse parandamise üheks viisiks on väetamine K, P rikka
puutuhaga, mis samal ajal aitab taaskasutada kütuse kasutamisest järele jäävaid jäätmeid.
Käesoleva töö eesmärk on uurida puutuha väetamise mõju puude kasvule ning selgitada välja
sobivaim tuhakogus kase kasvu stimuleerimiseks jääksoos. Töö käigus mõõdeti Pindi
katsealal kolmel erinevate puutuhakogustega (8, 10 ja 15 t/ha) väetatud katsealadel kaskede
kasvuparameetreid ja oluliste toitainete sisaldust turbas ning võrreldi neid kontrollala
tulemustega.
Katsete tulemusel selgus, et puutuhk tõstis oluliselt pH taset ja toitelementide (N, K, P, Ca,
Mg) sisaldust turbas. Optimaalne puutuha kogus kase kasvu stimuleerimiseks on 10 t/ha.
Sellel alal oli kõrguskasv 5,8 korda suurem kontrollala puude kasvust, juurdekasv 77 cm võrra
suurem ning juurekaela diameeter suurenes 5,9 korda. Puutuhaga väetamine stimuleeris puude
kasvu jääksoos ja tõstis nende vitaalsust.
Antud töös on tehtud ülevaade jääksoode erinevatest korrastamise viisidest kirjanduse põhjal.
Katse tulemused näitavad, et valides ammendatud turbaväljade metsastamise viisina
arukasega kultiveerimise ning kasutades väetisena puutuhka, on Pindi jääksoos optimaalseim
puutuha kogus 10t/ha
Estonia has approximately 10 000 ha cutaway peatlands. Abandoned peatlands are considered to be one of the main source of greenhouse gases, unlike natural mires, which are considered to be main CO2 binders and the main area for accumulation of carbon. Cutaway peatlands after peat extraction are unsuitable for the development of new vegetation because of destroyed water regime and unsuitable nutrient content of peat for re-vegetation. One of the most promising ways of using cutaway peatlands is their forestation. As cutaway peatlands suffer from a shortage of nutrients, one of the ways for improving growth conditions of trees to accelerate their growth would be to add wood ash to the growth substrate. Same time it helps to reuse waste leftover from biofuels. The aim of this work is to investigate effect of wood ash to the growth of trees and to calculate the most suitable amount of wood ash for the growth of Silver birch (Betula pendula) on the Pindi cutaway peatlands. Silver birch's growth parameters were measured from four test areas (fertilized areas with wood ash amounts 8, 10 and 15 t/ha and unfertilized control area) on Pindi cutaway peatland. Growth substrate nutrition levels were assessed and compared. Results show higher pH level and better nutrient concentrations in fertilized peat. The most optimal amount of wood ash is 10 t/ha. Birches on area with wood ash dose 10t/ha show 5,8 times higher growth speed and trees are 77 cm higher , root collar diameter is 5,9 times bigger compared with control area. Fertilization with nutrient-rich ash notably increased tree growth in peatland and increased their vitality. This work gives an overview about cutaway peatlands recultivation methods based on literature. Best method for Pindi cutaway peatland forestation is cultivation of Silver birch (Betula pendula) using wood ash as fertilizer with amount 10 t/ha.
Estonia has approximately 10 000 ha cutaway peatlands. Abandoned peatlands are considered to be one of the main source of greenhouse gases, unlike natural mires, which are considered to be main CO2 binders and the main area for accumulation of carbon. Cutaway peatlands after peat extraction are unsuitable for the development of new vegetation because of destroyed water regime and unsuitable nutrient content of peat for re-vegetation. One of the most promising ways of using cutaway peatlands is their forestation. As cutaway peatlands suffer from a shortage of nutrients, one of the ways for improving growth conditions of trees to accelerate their growth would be to add wood ash to the growth substrate. Same time it helps to reuse waste leftover from biofuels. The aim of this work is to investigate effect of wood ash to the growth of trees and to calculate the most suitable amount of wood ash for the growth of Silver birch (Betula pendula) on the Pindi cutaway peatlands. Silver birch's growth parameters were measured from four test areas (fertilized areas with wood ash amounts 8, 10 and 15 t/ha and unfertilized control area) on Pindi cutaway peatland. Growth substrate nutrition levels were assessed and compared. Results show higher pH level and better nutrient concentrations in fertilized peat. The most optimal amount of wood ash is 10 t/ha. Birches on area with wood ash dose 10t/ha show 5,8 times higher growth speed and trees are 77 cm higher , root collar diameter is 5,9 times bigger compared with control area. Fertilization with nutrient-rich ash notably increased tree growth in peatland and increased their vitality. This work gives an overview about cutaway peatlands recultivation methods based on literature. Best method for Pindi cutaway peatland forestation is cultivation of Silver birch (Betula pendula) using wood ash as fertilizer with amount 10 t/ha.
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