Search results for "putkilokasvit"
showing 10 items of 13 documents
The effect of buffer strip width and selective logging on streamside plant communities
2019
Background Riparian forests surrounding streams host high biodiversity values, but are threatened by clear-cut logging. Narrow buffer strips of about 15 m are commonly left between the stream and the clear-cut, but studies suggest that the buffer width should be at least 30 m to protect riparian plant communities. Moreover, selective logging is often allowed on the buffer strips in order to increase economic gain. We used an experiment of 43 riparian sites where buffer strip width and selective logging within the strip were manipulated and supplemented with unlogged control sites. We report the short-term changes in the community composition of vascular plants and mosses near the stream (0–…
Kaupunkimetsien raivauksen ekologiset vaikutukset
2010
The role of landscape, topography, and geodiversity in explaining vascular plant species richness in a fragmented landscape
2016
We explained vascular plant species richness patterns in a 286 km(2) fragmented landscape with a notable human influence. The objective of this study was two-fold: to test the relative importance of landscape, topography and geodiversity measures, and to compare three different landscape-type variables in species richness modeling. Moreover, we tested if results differ when only native species are considered. We used generalized linear modeling based variation partitioning and generalized additive models with different explanatory variable sets. Landscape and topography explained the majority of the variation but the relative importance of topography and geodiversity was higher in explainin…
Plant trait‐environment relationships in tundra are consistent across spatial scales
2023
Patterns and processes shaping ecosystems vary across spatiotemporal scales. As plant functional traits reflect ecosystem properties, investigating their relationships with environment provides an important tool to understand and predict ecosystem structure and functioning. This is particularly important in the tundra where a changing climate may trigger severe alterations in plant communities as both summer and winter conditions are changing. Here, we investigate the relationships between key environmental drivers including summer temperature, snow persistence, topographic position and soil pH, and species height, specific leaf area (SLA) and seed mass as plant traits. The study is carried…
Eteläboreaalisen vyöhykkeen putkilokasvien lajirunsaus maisematasolla
2014
Biodiversiteetin epätasaista jakaantumista on usein tutkittu putkilokasveilla, koska ne ovat ravintoketjun ensimmäinen taso. Putkilokasvien lajirunsauden selittäjät riippuvat mittakaavasta. Suurilla alueilla auringon energian määrä ja veden saatavuus selittävät hyvin putkilokasvien lajimäärää pohjoisella pallonpuoliskolla. Maisematasolla ilmasto ei ole merkittävä selittäjä. Paikallisella tasolla lajirunsauteen vaikuttavat abioottiset ja bioottiset tekijät. Boreaalisessa metsässä ravinteisuus, vesitalous ja valon määrä selittävät lajimäärää. Lisäksi ihmisen toimilla on merkitystä putkilokasvien lajimäärään. Se kasvaa, koska siemeniä kulkeutuu ihmisen mukana uusille alueille. Ihmisen toiminta…
Effects of undergrowth removal and edge proximity on ground beetles and vascular plants in urban boreal forests
2019
Urban forests are regularly managed for human safety and esthetic reasons, but they are crucial habitat for many species. Removals of undergrowth occur commonly in these forests, yet the ecological consequences of these operations are poorly understood. We sampled ground beetles (Coleoptera, Carabidae) and vascular plants along 20-m edge gradients in Finnish urban forests, in five stands treated 0.5–2.5 years earlier with undergrowth removal and in five untreated stands. We hypothesized that undergrowth removal and edge proximity would benefit opportunistic and open-habitat species, whereas shady-habitat species would be affected negatively. (1) Regarding carabids, diversity and evenness in…
Road verges provide alternative habitats for some, but not all, meadow plants
2021
Questions Agricultural intensification has led to the decline of biodiverse meadows and other semi-natural grasslands. Road verges offer potential alternative habitats for meadow species, but they may not be suitable for all meadow species due to different soil properties, frequent disturbances, pollution or suboptimal management. Are the communities of vascular plants and bryophytes similar or dissimilar to those in mown or grazed meadows? What kind of species are associated with road verges, mown meadows or grazed meadows? How do the habitat types differ in their soil conditions and disturbance intensity? Location The study was conducted on 36 sites in Central Finland. Methods We compared…
Turun kaupunkikedot : kytkeytyneisyyden ja ympäristötekijöiden merkitys kasvilajirikkaudelle
2019
Kedot ovat lajistoltaan rikkaita perinnebiotooppeja ja äärimmäisen uhanalaisia elinympäristöjä, joita uhkaa kaupungeissa rakentaminen ja umpeenkasvu. Pro gradu -työssäni selvitin paikallisten ympäristötekijöiden ja maiseman kytkeytyneisyyden yhteyttä hoitamattomien kaupunkiketojen putkilokasvi- ja sammallajirikkauteen. Kartoitin 33 tutkimuskedolta putkilokasvi- ja sammallajiston ja mittasin ympäristötekijöitä maastossa ja paikkatieto-ohjelman avulla, tutkimusruudun ja kedon mittakaavalla. Tilastollisissa analyyseissä käytin yleistettyjä lineaarisia malleja. Tulosten perusteella putkilokasvien lajimäärää selittivät kedon koko, kaltevuus, kallioisuus, paahteisuus ja maaperän happamuus. Sammal…