Kuusikute harvendusraie mõju puistu struktuuritunnustele
Laen...
Kuupäev
2019
Kättesaadav alates
10.09.2019
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Surnud puud pakuvad elupaiku ja toitu väga paljudele organismidele. Surnud puidus on
seotud pikka aega süsinik ning lõpuks lagunedes annab surnud puit mulda taimedele
vajalikke toitaineid. Metsade majandamine mõjutab surnud puidu koguseid ja kvaliteeti.
Käesoleva töö eesmärk oli uurida, kuidas harvendusraied mõjutavad kuusepuistus oleva
surnud ja elus puidu kogust. Selleks teostas töö autor mõõtmisi kahekümnes harvendatud
kuusepuistus ning saadud tulemusi võrreldi eelnevalt mõõdetud harvendamata puistute
andmetega. Harvendusraiete tagajärjel väheneb surnud puidu kogus puistutes. Kogu puidu
kogusest harvendamata aladel oli surnud püstist puitu 6,08% ja harvendatud aladel kõigest
2,45%. Harvendamata puistus oli püstiste surnud puude maht 31 m3
/ha ning harvendatud
puistus 10,3 m3
/ha. Harvendatud puistus oli jämedat lamapuitu 11,3 m3
/ha vähem kui
harvendamata puistus (harvendamata puistus 33,9 m3
/ha ja harvendatud puistus 22,6 m3
/ha).
Peenikese lamapuidu maht harvendatud aladel oli 7,7 m3
/ha ja harvendamata aladel 14,6
m3
/ha. Kui harvendamata aladel oli rohkem looduslikke kände (harvendamata puistus 1,3
m3
/ha; harvendatud puistus 0,2 m3
/ha), siis harvendatud aladel oli rohkem raiutud kände
(harvendamata puistus 0,7 m3
/ha; harvendatud puistus 2,3 m3
/ha).
Dead trees offer shelter and food for many organisms. In dead wood is CO2 tied for a very long time and after decaying it gives back to soil a lot of nutritions for plants. Managing forests affects the amount and quality of dead trees. The aim of this thesis is to research the effect of thinning to the spruce stands and how thinning can impact the amount of the dead trees in stands. To complete this thesis author measured twenty different thinned spruce stands and compared results with unthinned spruce stands. The results showed that after thinning the amount of dead wood in forests decreased. The amount of dead trees out of all trees in unthinned stands was 6,08% and in thinned stands it was only 2,45%. In unthinned stands standing deadwood volume was 31 cubic meters per hectare and in thinned stands the volume was 10,3 cubic meters per hectare. In thinned stands the volume of coarse woody debris was 11,3 cubic meters per hectare lower than in unthinned stands (unthinned stands 33,9 cubic meters per hectare; thinned stands 22,6 cubic meters per hectare). Fine woody debris in thinned stands was 7,7 cubic meters per hectare and in unthinned stands 14,6 cubic meters per hectare. The volume of naturally formed tree stumps in unthinned stands was higher than in thinned stands (unthinned stands 1,3 cubic meters per hectare; thinned stands 0,2 cubic meters per hectare), the volume of tree stumps made by human was higher in thinned stands (thinned stands 2,3 cubic meters per hectare; unthinned stands 0,7 cubic meters per hectare).
Dead trees offer shelter and food for many organisms. In dead wood is CO2 tied for a very long time and after decaying it gives back to soil a lot of nutritions for plants. Managing forests affects the amount and quality of dead trees. The aim of this thesis is to research the effect of thinning to the spruce stands and how thinning can impact the amount of the dead trees in stands. To complete this thesis author measured twenty different thinned spruce stands and compared results with unthinned spruce stands. The results showed that after thinning the amount of dead wood in forests decreased. The amount of dead trees out of all trees in unthinned stands was 6,08% and in thinned stands it was only 2,45%. In unthinned stands standing deadwood volume was 31 cubic meters per hectare and in thinned stands the volume was 10,3 cubic meters per hectare. In thinned stands the volume of coarse woody debris was 11,3 cubic meters per hectare lower than in unthinned stands (unthinned stands 33,9 cubic meters per hectare; thinned stands 22,6 cubic meters per hectare). Fine woody debris in thinned stands was 7,7 cubic meters per hectare and in unthinned stands 14,6 cubic meters per hectare. The volume of naturally formed tree stumps in unthinned stands was higher than in thinned stands (unthinned stands 1,3 cubic meters per hectare; thinned stands 0,2 cubic meters per hectare), the volume of tree stumps made by human was higher in thinned stands (thinned stands 2,3 cubic meters per hectare; unthinned stands 0,7 cubic meters per hectare).
Kirjeldus
Bakalaureusetöö
Metsanduse õppekaval
Märksõnad
bakalaureusetööd, elukeskkond, harvendusraie, puit