Hariliku kuuse eeluuenduse kohanemine ja kasvudünaamika muutuvates tingimustes
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Kuupäev
2017
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
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Kirjastaja
Eesti Maaülikool
Abstrakt
Magistritöö eesmärgiks oli uurida hariliku kuuse eeluuenduse kohanemist ja
kasvudünaamikat muutuvates tingimustes. Selleks valiti ajavahemikul 2008-2010 igal
aastal SA Järvselja Õppe- ja Katsemetskonna territooriumil (Kvartal JS272) vana metsa
varjus kasvanud hariliku kuuse eeluuenduse hulgast 30 puud, fikseeriti algsituatsioon ja
istutati seejärel ümber endisele põllumaale rajatud katsealale.
Keskenduti valguse mõju analüüsile, milleks pooltele puudele seati varjestus ja pooled
puud jäeti kasvama täisvalguse kätte. Põhjalikumalt uuriti eeluuenduse puude kasvu
iseloomustavaid näitajaid (keskmist kõrgust, keskmist diameetrit, ladvavõrse pikkust,
külgvõrse pikkust, külgvõrse okkamassi ja külgvõrse okaste arvu ning külgvõrse okaste
keskmist pikkust). Katsealal teostati mõõtmisi ajavahemikul 2008-2015, igal aastal
vegetatsiooniperioodi lõpus. Andmete analüüs, joonised ja tabelid on koostatud eelnevate
näitajate põhjal.
Andmete analüüsist selgus, et varjestus mõjus hariliku kuuse eeluuendusele positiivselt.
Tulemustest on näha, et varjestusel on statiltiliselt oluline mõju eeluuenduse kõrgusele ja
ladvavõrse pikkusele. Samas ei ole varjestusel statistiliselt olulisust mõju diameetri
kasvule. Samuti ilmnes varjestuse positiivne mõju külgvõrse pikkusele, mis omakorda
mõjutab okaste arvu külgvõrsel. Lisaks oli varjestusel statistiliselt oluline mõju külgvõrse
okkamassi ja külgvõrse pikkuse vahelisele suhtele.
Töö tulemuste põhjal võib järeldada, et vana metsa alt endisele põllumaale ümberistutatud
hariliku kuuse eeluuendus on võimeline näitama head kohanemist ja kasvu muutuvates
tingimustes ning varjestatud puudel on kohanemine uute kasvutingimustega parem.
The aim of this Master thesis was to study acclimation and growth dynamics of advance regeneration of Norway spruce in changing conditions. For this purpose, during the period of 2008-2010, each year in Järvselja Training and Experimental Forest Center (Compartment JS272) it was selected 30 advance regeneration trees that were grown in the shade of old forest, it was fixed the initial situation and after that trees were transplanted on former agricultural field. The focus was on the analysis of the effects of light, therefore shading was set for half of the trees and half of the trees were left to grow in full light. It was studied in detail the growth characteristics of advance regeneration trees (height, diameter, top shoot length, lateral shoot length, needle mass and number of needles, and average length of needles). Measurements were carried out during the period of 2008-2015, each year at the end of vegetation period. Data analysis, figures and tables are compiled based on previously mentioned tree characteristics. The reults of data analysis showed that shading had a positive effect on advance regeneration of Norway spruce. The results also show that shading had statistically significant impact on advance regeneration height and top shoot length. At the same time, shading did not have statistically significant impact on diameter growth. It also appeared that shading had a positive impact on lateral shoot length, which in turn affects the number of needles on lateral shoot. In addition, shading had statistically significant impact on the ratio between lateral shoot needle mass and lateral shoot length. Based on the results of this study, it can be concluded that advance regeneration from the shade of old forest and transplanted on former agricultural field is able to show good growth reponse and acclimation in changing conditions, and shaded trees adapt better to new growing conditions.
The aim of this Master thesis was to study acclimation and growth dynamics of advance regeneration of Norway spruce in changing conditions. For this purpose, during the period of 2008-2010, each year in Järvselja Training and Experimental Forest Center (Compartment JS272) it was selected 30 advance regeneration trees that were grown in the shade of old forest, it was fixed the initial situation and after that trees were transplanted on former agricultural field. The focus was on the analysis of the effects of light, therefore shading was set for half of the trees and half of the trees were left to grow in full light. It was studied in detail the growth characteristics of advance regeneration trees (height, diameter, top shoot length, lateral shoot length, needle mass and number of needles, and average length of needles). Measurements were carried out during the period of 2008-2015, each year at the end of vegetation period. Data analysis, figures and tables are compiled based on previously mentioned tree characteristics. The reults of data analysis showed that shading had a positive effect on advance regeneration of Norway spruce. The results also show that shading had statistically significant impact on advance regeneration height and top shoot length. At the same time, shading did not have statistically significant impact on diameter growth. It also appeared that shading had a positive impact on lateral shoot length, which in turn affects the number of needles on lateral shoot. In addition, shading had statistically significant impact on the ratio between lateral shoot needle mass and lateral shoot length. Based on the results of this study, it can be concluded that advance regeneration from the shade of old forest and transplanted on former agricultural field is able to show good growth reponse and acclimation in changing conditions, and shaded trees adapt better to new growing conditions.
Kirjeldus
Magistritöö
Loodusvarade kasutamise ja kaitse õppekaval
Märksõnad
magistritööd, eeluuendused, harilik kuusk, kasv, kohanemine, valgus