Puistu koosseisu ja lamapuidu mahu hindamine Lõuna-Eesti rohunditerikastes kuusikutes
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Kuupäev
2015
Kättesaadavus
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Käesolev bakalaureusetöö eesmärgiks on hinnata puistu koosseisu neljateistkümnel
proovitükil, mis on EELIS-e andmetel hinnatud Natura 2000 elupaigatüübiks "Hariliku
kuusega Picea abies rohunditerikkad Fennoskandia metsad“.
Proovitükid asusid Lõuna-Eestis ning andmeid on analüüsitud MS Exceli keskkonnas.
Hinnatud on erinevate kasvukohatüüpide surnud puude ja lamapuidu mahtu ning puistu
koosseisu. Lamapuidu ja elusate puude mahu sõltuvuse hindamiseks on kasutatud (Hii-ruut) χ2
testi.
Tulemustest selgus, et angervaksa kasvukohatüübis esines kõige rohkem surnuid puid.
Märkimisväärselt ei jäänud maha ka uuritavad naadi ja jänesekapsa kasvukohatüüp.
Sõltumatuse χ
2
testi tulemuste ja jooniste põhjal saab järeldada, et surnud ja elusate puude
mahud on omavahel tugevas sõltuvuses.
Proovitükkidel esines kõige rohkem elusate ja surnud puude osakaalus kuuske. Lisaks olid
ohtralt esindatud veel kask ja haab. Ülejäänud puuliikide varieeruvus oli proovitükkidel suur,
kuid nende mahud ei olnud nii märkimisväärsed kui eelpoolmainitud liikidel.
Metsade ökoloogilise taastamise üheks tööprotsessiks on lamapuidu, surnud puidu ja tüügaste
tekitamine ühevanuselisse puistusse. Seetõttu ongi oluline teada, kui palju surnud- ja
lamapuitu on meie looduslikes metsades. Antud töö tulemusi saab tulevikus kasutada
kasvukohatüüpide muutuste hindamiseks ning metsade taastamistööde kavandamisel.
This Batchelor`s thesis aim is to evaluate mixture of tree species on fourteen sample plots that are presented as Natura 2000 habitat type “Fennoscandian herb-rich forest with Picea abies” in EELIS (Estonian Nature Information System) database. Sample plots were located in Southern-Estonia and data was analysed by using MS Excel. Assessment of different habitat type deadwood and down timber volume and mixture of tree species was made. The dependence of living trees to down timber was made by χ 2 (Hii-square) test. Results showed that the highest volume of dead wood occurred in Filipendula site type. The Aegopodium and Oxalis sites had also high volume of dead wood. In conclusion of figures and χ 2 (Hii-square) test results we can deduce that live tree volume depends highly on dead tree volume. In living and dead tree species volume the dominant species was spruce Picea abies. Birch Betula pendula and aspen Populus termula had also high proportion in the sample plots volume. Other tree species variation was high in all sample plots, but their volume wasn`t as remarkable as formentioned species. Ecological restoration in forest includes also creating of down timber, dead wood and stubs into even aged forest as one work method to create biodiversity. For that reason is important to know how much is the volume of dead wood and down timber in our natural forests. Results of this study can be used for assessment of habitat type changes and for restoration management planning in the future.
This Batchelor`s thesis aim is to evaluate mixture of tree species on fourteen sample plots that are presented as Natura 2000 habitat type “Fennoscandian herb-rich forest with Picea abies” in EELIS (Estonian Nature Information System) database. Sample plots were located in Southern-Estonia and data was analysed by using MS Excel. Assessment of different habitat type deadwood and down timber volume and mixture of tree species was made. The dependence of living trees to down timber was made by χ 2 (Hii-square) test. Results showed that the highest volume of dead wood occurred in Filipendula site type. The Aegopodium and Oxalis sites had also high volume of dead wood. In conclusion of figures and χ 2 (Hii-square) test results we can deduce that live tree volume depends highly on dead tree volume. In living and dead tree species volume the dominant species was spruce Picea abies. Birch Betula pendula and aspen Populus termula had also high proportion in the sample plots volume. Other tree species variation was high in all sample plots, but their volume wasn`t as remarkable as formentioned species. Ecological restoration in forest includes also creating of down timber, dead wood and stubs into even aged forest as one work method to create biodiversity. For that reason is important to know how much is the volume of dead wood and down timber in our natural forests. Results of this study can be used for assessment of habitat type changes and for restoration management planning in the future.
Kirjeldus
Märksõnad
bakalaureusetööd