Puisrohumaade liigirikkust mõjutavad tegurid Euroopa hemiboreaalses ja boreaalses vööndis
Laen...
Kuupäev
2025
Kättesaadavus
04.09.2025
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Poollooduslikud elupaigad on väga kõrge liigirikkusega evolutsiooniliste ja ajalooliste põhjuste tõttu. Kuna puisrohumaad on ohustatud kooslused, on oluline teada nende liigirikkust mõjutavaid tegureid. Bakalaureusetöö eesmärgiks on analüüsida puisrohumaade liigirikkust mõjutavaid tegureid. Töö koostamiseks otsiti andmeid teadusartiklitest, kasutades otsingumootorit Web of Science. Märksõnadena kasutati „past land use“, „historical land use“, „previous land use“, „land use history“, „ancient“, „old trees“, „wooded grassland“, „wooded pasture“, „wooded meadow“, „diversity“ ja „biodiversity“. Otsingut täpsustati ka piirkonnaga, valides välja artiklid, mis käsitlesid Eesti, Soome, Norra, Rootsi, Läti ja Leedu piirkonda. Kitsendatud regiooniga tuli otsingutulemuseks 43 artiklit. Tulemustest valiti välja sobivad teemakohased artiklid, valituks osutus 20 artiklit. Töö tulemusena selgus, et kõige rohkem uuritud teguriteks olid puude tihedus, karjatamine ja majandamise lakkamine. Selgelt positiivset mõju puisrohumaade liigirikkusele avaldasid karjatamine, niitmine ja ajaloolise majandamise järjepidevus. Negatiivset mõju puisrohumaade liigirikkusele avaldasid majandamise lakkamine ja puude tihedus. Ajaloolise maakasutuse ulatuse mõju kohta ei saa uuritud andmete põhjal üldistusi teha.
Semi-natural habitats are highly species-rich due to evolutionary and historical reasons. Because wooded grasslands are endangered communities, it is important to understand the factors that affect their species richness. The objective of this bachelor's thesis is to analyze the factors influencing the species richness of wooded grasslands. For the preparation of the study, data were retrieved from scientific articles using the Web of Science search engine. The keywords used were “past land use”, “historical land use”, “previous land use”, “land use history”, “ancient”, “old trees”, “wooded grassland”, “wooded pasture”, “wooded meadow”, “diversity”, and “biodiversity”. The search was further refined by region, selecting articles that addressed Estonia, Finland, Norway, Sweden, Latvia, and Lithuania. This regional search yielded 43 articles. From these, 20 relevant articles were selected. The study's results revealed that the most investigated factors were tree density, grazing, and the cessation of management. Grazing, mowing, and the continuity of historical management clearly had a positive effect on the species richness of wooded grasslands, while the cessation of management and tree density had a negative effect. No generalizations can be made regarding the impact of the extent of historical land use based on the available data.
Semi-natural habitats are highly species-rich due to evolutionary and historical reasons. Because wooded grasslands are endangered communities, it is important to understand the factors that affect their species richness. The objective of this bachelor's thesis is to analyze the factors influencing the species richness of wooded grasslands. For the preparation of the study, data were retrieved from scientific articles using the Web of Science search engine. The keywords used were “past land use”, “historical land use”, “previous land use”, “land use history”, “ancient”, “old trees”, “wooded grassland”, “wooded pasture”, “wooded meadow”, “diversity”, and “biodiversity”. The search was further refined by region, selecting articles that addressed Estonia, Finland, Norway, Sweden, Latvia, and Lithuania. This regional search yielded 43 articles. From these, 20 relevant articles were selected. The study's results revealed that the most investigated factors were tree density, grazing, and the cessation of management. Grazing, mowing, and the continuity of historical management clearly had a positive effect on the species richness of wooded grasslands, while the cessation of management and tree density had a negative effect. No generalizations can be made regarding the impact of the extent of historical land use based on the available data.
Kirjeldus
Bakalaureusetöö
Keskkonnakaitse õppekaval
Märksõnad
bakalaureusetööd, ajalooline maastiku struktuur ja maakasutus, abiootilised tegurid, biootilised tegurid