Loodusliku uuenduse arvukus ja liigiline koosseis valgustusraie eelselt ja järgselt mustika kasvukohatüübis
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Kuupäev
2024
Kättesaadavus
04.09.2024
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Valgustusraie on üks levinum ja tähtsaim metsakasvatuslik võte, millega pannakse alus tulevikupuistu liigilisele koosseisule ning suurendatakse majanduslikku tasuvust. Bakalaureusetöö annab ülevaate noorendike koosseisust ja arvulistest näitajatest valgustusraiete eelselt ja järgselt. Mõõtmised viidi läbi Pärnu- ja Viljandimaal asuvatel kahel kinnistul ja kuuel eraldisel. Töö käigus mõõdeti puude tükiarvud ja kõrgused puuliigiti 25 proovitükil. Töös on kasutatud ja analüüsitud välitöödel kogutud andmeid, võrdlemisel kasutatud andmed saadi Metsanduse programmi projekti nr 15071 aruandest. Andmete töötlemiseks kasutati programmi MS Excel.
Bakalaureusetöö tulemustest selgus, et pärast valgustusraieid on puistute kõrguste vaheline erinevus 1,3m. Puude arv enne valgustusraiet puistu keskmisest kõrgusest ei sõltu, küll aga on puude arvu sõltuvus keskmisest kõrgusest pärast raiet oluline 90% usaldusnivoo juures. Männi ja kuuse kooseisukordaja suurenes oluliselt valgustusraie tulemusena, kase koosseisukordaja jäi samaks. Esimese ja teise valgustusraie järgselt on 95% usaldusnivoo juures puistute kõrgused usaldusväärselt erinevad, aga puude arv ei ole usaldusväärselt erinev.
Pre-commercial thinning is one of the most common and important silvicultural techniques used to establish the species composition of the future stand and increase economic profitability. The bachelor's thesis provides an overview of the composition and numerical indicators of young stands before and after pre-commerial thinning. Measurements were carried out on two properties and six forest comparments located in Pärnu and Viljandi counties. During the work, the numbers and heights of trees by species were measured on 25 sample plots. Used and analyzed data in this work have been collected during the field work, the data used in the comparison was obtained from the Forestry Program Project No. 15071 report. MS Excel was used to analyze the data. The results of the bachelor's thesis revealed that after pre-commercial thinning, the difference in the heights of the stands was 1.3m. The number of trees before pre-commercial thinning does not depend on the average height of the stand, but the dependence of the number of trees on the average height after pre-commercial thinning is significant at a 90% confidence level. The composition coefficient of pine and spruce increased significantly as a result of pre-commercial thinning, while the composition coefficient of birch remained the same. Following the first and second pre-commercial thinnings, the heights of the stands are significantly different at a 95% confidence level, but the number of trees is not significantly different.
Pre-commercial thinning is one of the most common and important silvicultural techniques used to establish the species composition of the future stand and increase economic profitability. The bachelor's thesis provides an overview of the composition and numerical indicators of young stands before and after pre-commerial thinning. Measurements were carried out on two properties and six forest comparments located in Pärnu and Viljandi counties. During the work, the numbers and heights of trees by species were measured on 25 sample plots. Used and analyzed data in this work have been collected during the field work, the data used in the comparison was obtained from the Forestry Program Project No. 15071 report. MS Excel was used to analyze the data. The results of the bachelor's thesis revealed that after pre-commercial thinning, the difference in the heights of the stands was 1.3m. The number of trees before pre-commercial thinning does not depend on the average height of the stand, but the dependence of the number of trees on the average height after pre-commercial thinning is significant at a 90% confidence level. The composition coefficient of pine and spruce increased significantly as a result of pre-commercial thinning, while the composition coefficient of birch remained the same. Following the first and second pre-commercial thinnings, the heights of the stands are significantly different at a 95% confidence level, but the number of trees is not significantly different.
Kirjeldus
Bakalaureusetöö
Metsanduse õppekaval
Märksõnad
bakalaureusetööd, noorendiku hooldus, liigiline koosseis, metsakasvatus