Häiringute mõju puude radiaalsele juurdekasvule Põhja-Eesti männikutes
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Kuupäev
2013
Kättesaadav alates
ainult raamatukogus, only in library
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Teatavasti mõjutavad puude kasvu nii piirkonna kliimatingimused kui ka tehtud raied. Käesoleva bakalaureusetöö eesmärgiks ongi analüüsida temperatuuri ja sademete mõju mändide radiaalsele juurdekasvule Sagadi endises metskonnas asuvatel püsiproovitükkidel ning uurida samas piirkonnas tehtud raiete efektiivsust.
Analüüsipulgad võeti 2007. aasta välitööde käigus ning hiljem mõõdeti neilt aastarõngalaiused. Aastarõngalaiused ristdateeriti ja standardiseeriti ning saadud andmeid kasutades koostati perioodi 1947-2007 kohta näitaasta ja superposed epoch analüüs ning koos kliimaandmetega ka korrelatsioonianalüüs. Raiete mõju uurimiseks kasutati Sagadi arhiivimaterjale tehtud raiete aegade leidmiseks ning võrreldi neid aastarõngalaiuste kronoloogiatega.
Töö tulemusena selgus, et vaadeldavas piirkonnas mõjutasid positiivselt puude radiaalset kasvu märtsi maksimaalsed temperatuurid, kasvule eelneva aasta juuni temperatuurid ning kasvuaasta ja sellele eelneva aasta augusti sademed. Negatiivset mõju omasid kasvule eelneva aasta augusti temperatuur ning kasvuaasta juuli maksimaalne temperatuur. Raiete võimalik positiivne mõju ilmnes proovitükkides 1091, 1092, 1103, 1110, 1111, 1112, 1114, 1115, 1116, 1117, 1118 ning 1120. Raiete mõju täpseks uurimiseks oleks vaja teha täiendavaid uuringuid.
It is widely known that regional climate conditions as well as cutting have an impact on tree growth. Thus, the purpose of the present Bachelor’s thesis is to analyse the impact of temperature and precipitation on the radial growth of Scots pines by studying permanent sample plots located in the former forest district of Sagadi. In addition, the thesis aims at investigating the effectiveness of cutting carried out in the same region. The samples were taken during fieldwork in 2007 and these served as the basis for measuring tree ring widths later. The tree ring widths were crossdated and standardised and the received data was used to compile a pointer year analysis, a superposed epoch analysis, and a correlation analysis (with climatic data) of the period 1947-2007. In order to investigate the impact of cutting, Sagadi’s archive materials were used to find out the exact times of the cuttings in the region, which were then compared to the chronologies of tree ring widths. The results of the thesis showed that a number of factors had a positive impact on the radial growth of trees in the region under observation: maximum temperatures in March, temperatures in June in the year preceding the growth year, and precipitation in August both in the growth year and the year before. Two factors had a negative impact on the radial growth of trees: temperatures in August in the year preceding the growth year and the maximum temperature of July in the growth year. The possible positive impact of cutting occurred in the following sample plots: 1091, 1092, 1103, 1110, 1111, 1112, 1114, 1115, 1116, 1117, 1118 and 1120. Further research is needed in order to investigate the exact impact of cutting.
It is widely known that regional climate conditions as well as cutting have an impact on tree growth. Thus, the purpose of the present Bachelor’s thesis is to analyse the impact of temperature and precipitation on the radial growth of Scots pines by studying permanent sample plots located in the former forest district of Sagadi. In addition, the thesis aims at investigating the effectiveness of cutting carried out in the same region. The samples were taken during fieldwork in 2007 and these served as the basis for measuring tree ring widths later. The tree ring widths were crossdated and standardised and the received data was used to compile a pointer year analysis, a superposed epoch analysis, and a correlation analysis (with climatic data) of the period 1947-2007. In order to investigate the impact of cutting, Sagadi’s archive materials were used to find out the exact times of the cuttings in the region, which were then compared to the chronologies of tree ring widths. The results of the thesis showed that a number of factors had a positive impact on the radial growth of trees in the region under observation: maximum temperatures in March, temperatures in June in the year preceding the growth year, and precipitation in August both in the growth year and the year before. Two factors had a negative impact on the radial growth of trees: temperatures in August in the year preceding the growth year and the maximum temperature of July in the growth year. The possible positive impact of cutting occurred in the following sample plots: 1091, 1092, 1103, 1110, 1111, 1112, 1114, 1115, 1116, 1117, 1118 and 1120. Further research is needed in order to investigate the exact impact of cutting.
Kirjeldus
Märksõnad
dendrokronoloogia, radiaalne juurdekasv, häiringud, raie, kliima, bakalaureusetööd