Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2024
Forfattere
Eva BrodSammendrag
Det er ikke registrert sammendrag
Forfattere
Eva BrodSammendrag
Det er ikke registrert sammendrag
Forfattere
Eva BrodSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Eva BrodSammendrag
Det er ikke registrert sammendrag
Forfattere
Eva BrodSammendrag
Det er ikke registrert sammendrag
Forfattere
Eva BrodSammendrag
Det er ikke registrert sammendrag
Sammendrag
Background Vegetated infiltration systems such as raingardens and bioswales are challenging for plant growth and survival due to fluctuating hydrological conditions and further subsequent stresses. Aim Here, we investigated the effect of fluctuation hydrology on growth and flowering and subsequent winter frost hardiness or spring salt tolerance for two common raingarden plant species, Filipendula ulmaria, and Calamagrostis ×acutiflora ‘Karl Foerster’, under controlled conditions. Methods During summer, plants were exposed to four hydrological regimes, each with a different combination of repeating dry and wet cycles. Then, after natural winter acclimation and storage, plants went through standardized freezing tests to determine LT50 and regrowth potential or were exposed to four levels of salt treatments (Control, 28 mM, 56 mM, and 84 mM NaCl) in the following spring. Results We found that fluctuating hydrology reduced the growth of Filipendula ulmaria, experiencing cycles of 72 hours of flooding and 264 hours of drained conditions, followed by a reduction of growth and flowering after salt exposure. Calamagrostis xacutiflora was less responsive to both fluctuating hydrology and salinity. Cycles with the longest dry conditions (Wet-dry cycles) showed the strongest negative effect on the performance of tested species. The hydrological regimes did not influence freezing tolerance in either species. Conclusion Moderate hydrological fluctuations did not cause damage to vegetation in vegetated infiltration systems, at least under shaded conditions. At the same time, drought tolerance is an important trait for species and cultivars in raingardens during hydrological fluctuations. Our prediction that hydrological conditions that negatively affected plant growth would reduce subsequent frost and salinity tolerance was only partially supported.
Forfattere
Hans Martin Hanslin Lina Mathea Gunvaldsen Sean Erik Foss Erling Ween Eriksen Mari ØgaardSammendrag
Takflater i byene skal helst være flerfunksjonelle der det skal produsere energi, håndtere overvann, bidra til biologisk mangfold, bidra til å kjøle ned byen i varme perioder osv. Slik flerbruk av takflater kan gi en del målkonflikter, men også noen synergier. I et prosjekt for Oslobygg ble målkonflikter ved bruk av solcellepaneler på grønne tak undersøkt. Prosjektet ble gjennomført med befaringer av kombinasjonstak med målinger og prøvetaking på tak, målrettede intervjuer og en workshop med næringsaktører og byggeiere. Til sammen 10 kombinasjonstak ble inkludert i befaringene. Prosjektet avdekket svakheter på flere nivå - fra selve konseptutviklingen, til anbud og kontrakter, og videre gjennom anleggsfasen, vedlikehold og drift. Rapporten tar for seg disse svakhetene og drar sammen en syntese og presenterer noen anbefalinger som kan brukes aktivt i implementeringen av klima- og overvannstrategier. Undersøkelsene viste tydelig konflikter mellom optimalisering og vedlikehold av vegetasjonen og energiproduksjonen for de fleste takene, men det er også eksempler på tak der det fungerer godt. Synergiene i form av mer effektiv energiproduksjon var mindre tydelige, men også mindre undersøkt. Flere av disse konfliktene kan unngås ved bedre prosjektering og involvering av leverandører i en tidlig fase. I tillegg til dette er det et stort behov for opplæring og instrukser for driftspersonell, både for den grønne delen av taket og for panelene.
Sammendrag
Purpose The impact of winter moisture on root metabolism and root integrity has potential consequences for the geographical distribution of drought-adapted succulent species and for their long-term performance on green roofs. The interacting effects of soil characteristics and precipitation frequency on root mortality under winter conditions and the potential to grow new roots in spring were evaluated for six Sedum species under controlled conditions. Methods To test for the impact of soil moisture during winter on root regrowth potential in six Sedum species, we used a combination of two substrates with differing water-holding capacity and four contrasting watering regimes. Specially, for the fine and coarse substrates, total pore volume was 42 and 46 %, respectively, and maximum water-holding capacity (i.e. field capacity) was 0.50 and 0.33 kg water per L, respectively. The four watering treatments involved overhead watering to runoff (approx. 10 mm): once every second week, once a week, three times per week and three times per week with 1 cm standing water in trays from January to March 2019. Results It was found that winter soil moisture had no major impact on root mortality or root regrowth potential in spring. Root mortality was not affected by watering frequency and regrowth potential showed no directional response to increased watering frequency, although species-specific responses were involved. Root diameter did not differ between the substrates, but there were some differences between the species. Sedum rupestre had on average the thickest roots (0.17 mm), followed by S. acre, S. anglicum and S. sexangulare (0.15–0.16 mm), while S. album and S. hispanicum had the thinnest roots (0.12–0.13 mm). Moreover, effects of watering frequency on root mortality and regrowth potential were not influenced by soil water-holding capacity across species. We concluded that winter soil moisture had no negative effects on root performance within the range of treatments tested here. Conclusions Root response to transient waterlogging or moist but unsaturated soil may not be an important mechanism for determining the survival and distribution of temperate Sedum species during winter.