Lehise radiaalkasvude varieeruvuse analüüs tüve erinevatel kõrgustel
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Kuupäev
2016
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Eestis on analüüsipuid metsanduslikes uurimustöödes kasutatud üsna vähe, kuna see on pikk ja
keeruline protsess. See annab aga suurema ja põhjalikuma võimaluse sellega edaspidi tegeleda.
Antud lõputöö eesmärgiks on analüüsida lehise radiaalset juurdekasvu puu tüve erinevatel
kõrgustel, võttes arvesse sademed ja temperatuuri.
Töös on kasutatud Järvselja metsa hübriidlehise (Larix x marschlinsii Coaz) ja jaapani lehise
(Larix kaempferi (Lamb.) Sarg) 17ne analüüsipuu kettaid, millelt mõõdeti aastarõngaste laiused
LINTAB süsteemiga, 0,01mm täpsusega. Mõõdetud juurdekasvuseeriad standardiseeriti kasutades
spline funktsiooni. Puu kettad jaotati neljaks osaks ehk kännu, rinnaskõrguse, tüve ja võra osaks.
Statistiliselt olulised piirid on kliima ja radiaalse juurdekasvuvahelistes seostes üle
korrelatsioonikordaja 0,3 ja alla -0,3.
Erinevatelt puu kõrgustelt võetud ketastelt ilmnes, et juurdekasvuidneksite kooskõla on üsna hea,
sama näitavad ka korrelatsioonikordajad.
Kliima mõju analüüs radiaalsele juurdekasvule näitas, et suurimaks mõjutajaks olid sademed.
Hübriidlehisel esines positiivne mõju võra osas maikuu temperatuuridega ning kännu osa
mõjutasid negatiivselt juunikuu temperatuurid. Kõige rohkem mõjutasid sademed kännu osa.
Kõige suurem positiivne mõju oli juunikuu sademetel ning suvekuude sademete
summas,negatiivne aga oktoobrikuus.
Jaapani lehisel puudus temperatuuri mõju täielikult ning sademed mõjutasid nii võra,tüve kui
kännuosa. Kännuosas esines nii negatiivset kui positiivset sademete mõju. Antud töö tulemused
annavad aimu puus toimuvatele protsessidele nagu näiteks vegetatsiooniperioodi algus ja lõpp.
In forestry-related researches of Estonia, analyse trees are slightly used, because it is a long and complicated process. That provides larger and more comprehensive opportunity to research this in the future. The present thesis aims analysing radial increment in larch trunks at different heights, taking precipitation and temperatures into account. The study used 17 Järvselja analysis trees of hybrid larch (Larix x marschlinsiiCoaz) and Japanese larch (Larixkaempferi (Lamb.) Sarg), which widths of annual rings were measured with LINTAB system, to an accuracy of 0.01 mm. Measured increment series were standardized using a spline function. The tree discs were divided into four parts–stump, diameter at breast height (DBH), trunk and crown. The discs of different tree heights revealed that the consistency of increment indexes was quite good, as was demonstrated also by the correlation coefficients. The analysis of the climate impact showed that the biggest factor was precipitation. It came out that temperatures in May had a positive impact on the crown of the hybrid larch, and the stump was negatively affected by the temperatures in June. The effect of rainfall was seen at each height, stump was being affected the most. The rainfall in June and the average amount of rain in the summer months had the most positive impact, but the negative effect occurred in October. The Japanese larch: The effect of temperature missed completely and precipitation was affected the trunk, DBH and the stump. The most affected was the stump. The results of the present thesis give an idea of processes taking place in the tree, such as beginning and end of vegetation period.
In forestry-related researches of Estonia, analyse trees are slightly used, because it is a long and complicated process. That provides larger and more comprehensive opportunity to research this in the future. The present thesis aims analysing radial increment in larch trunks at different heights, taking precipitation and temperatures into account. The study used 17 Järvselja analysis trees of hybrid larch (Larix x marschlinsiiCoaz) and Japanese larch (Larixkaempferi (Lamb.) Sarg), which widths of annual rings were measured with LINTAB system, to an accuracy of 0.01 mm. Measured increment series were standardized using a spline function. The tree discs were divided into four parts–stump, diameter at breast height (DBH), trunk and crown. The discs of different tree heights revealed that the consistency of increment indexes was quite good, as was demonstrated also by the correlation coefficients. The analysis of the climate impact showed that the biggest factor was precipitation. It came out that temperatures in May had a positive impact on the crown of the hybrid larch, and the stump was negatively affected by the temperatures in June. The effect of rainfall was seen at each height, stump was being affected the most. The rainfall in June and the average amount of rain in the summer months had the most positive impact, but the negative effect occurred in October. The Japanese larch: The effect of temperature missed completely and precipitation was affected the trunk, DBH and the stump. The most affected was the stump. The results of the present thesis give an idea of processes taking place in the tree, such as beginning and end of vegetation period.
Kirjeldus
Märksõnad
lehis, radiaaljuurdekasv, tüvi, kõrgus, aastarõngad, aegridade analüüs, korrelatsioonanalüüs, bakalaureusetööd