Pekka Nöjd
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View article: Soil nitrogen drives inverse acclimation of xylem growth cessation to rising temperature in Northern Hemisphere conifers
Soil nitrogen drives inverse acclimation of xylem growth cessation to rising temperature in Northern Hemisphere conifers Open
Controlled experiments suggest that the seasonal build-up of nitrogen (N) limitation constrains the responses of forest autumn phenology to elevated temperatures. Therefore, rising soil N is expected to increase the delaying effects of ele…
View article: Fluxes of dissolved organic carbon in stand throughfall and percolation water in 12 boreal coniferous stands on mineral soils in Finland
Fluxes of dissolved organic carbon in stand throughfall and percolation water in 12 boreal coniferous stands on mineral soils in Finland Open
The magnitude and variation in DOC fluxes in bulk deposition (BD), stand throughfall (TF) and percolation water (PW) were determined on seven Scots pine and five Norway spruce plots in Finland during 1998-2004. Water fluxes for PW were cal…
View article: The effect of temperature and PAR on the annual photosynthetic production of Scots pine in northern Finland during 1906–2002
The effect of temperature and PAR on the annual photosynthetic production of Scots pine in northern Finland during 1906–2002 Open
The annual photosynthetic production of Scots pine (Pinus sylvestris) was simulated for 1906-2002 for a location in northern Finland. We used the PhenPhoto model, which combines two key features of photosynthesis: the response to instantan…
View article: Response of boreal forest vegetation to the fertility status of the organic layer along a climatic gradient
Response of boreal forest vegetation to the fertility status of the organic layer along a climatic gradient Open
Relationships between boreal understorey vegetation and chemical composition of the organic layer, stand productivity and climatic factors were studied on 27 coniferous monitoring plots along a S-N gradient in Finland using ordination tech…
View article: Fluxes of dissolved organic and inorganic nitrogen in relation to stand characteristics and latitude in Scots pine and Norway spruce stands in Finland
Fluxes of dissolved organic and inorganic nitrogen in relation to stand characteristics and latitude in Scots pine and Norway spruce stands in Finland Open
Feral American mink (Mustela vison) are emerging as one of the biggest threats to biodiversity in northern Europe. Here we summarize responses of migratory seabirds, island small mammals and amphibians to 15 years of large-scale, experimen…
View article: Foliar turnover rates in Finland — comparing estimates from needle-cohort and litterfall-biomass methods
Foliar turnover rates in Finland — comparing estimates from needle-cohort and litterfall-biomass methods Open
Soil carbon models serving national greenhouse gas (GHG) inventories need precise litter input estimates that typically originate from regionally-averaged and species-specific biomass turnover rates. We compared the foliar turnover rates e…
View article: Litterfall production and nutrient return to the forest floor in Scots pine and Norway spruce stands in Finland
Litterfall production and nutrient return to the forest floor in Scots pine and Norway spruce stands in Finland Open
The main objective of this study was to determine the importance of nutrient return in litterfall (LF) to forest nutrient cycling. Therefore, we investigated the quality and quantity of LF in relation to the above-ground tree biomass (AGT)…
View article: Partial asynchrony of coniferous forest carbon sources and sinks at the intra-annual time scale
Partial asynchrony of coniferous forest carbon sources and sinks at the intra-annual time scale Open
View article: Correction: Carbon Stocks and Transfers in Coniferous Boreal Forests Along a Latitudinal Gradient
Correction: Carbon Stocks and Transfers in Coniferous Boreal Forests Along a Latitudinal Gradient Open
View article: Transient Offset in <sup>14</sup>C After the Carrington Event Recorded by Polar Tree Rings
Transient Offset in <sup>14</sup>C After the Carrington Event Recorded by Polar Tree Rings Open
The Carrington event of 1859 has been the strongest solar flare in the observational history. It plays a crucial role in shedding light on the frequency and impacts of the past and future Solar Energetic Particle (SEP) events on human soci…
View article: Environment-induced growth changes in forests of Finland revisited - a follow-up using an extended data set from the 1960s to the 2020s
Environment-induced growth changes in forests of Finland revisited - a follow-up using an extended data set from the 1960s to the 2020s Open
View article: Carbon Stocks and Transfers in Coniferous Boreal Forests Along a Latitudinal Gradient
Carbon Stocks and Transfers in Coniferous Boreal Forests Along a Latitudinal Gradient Open
View article: Tree-ring N isotopic ratio increased with increasing latitude and decreasing N availability in pine stands across Finland
Tree-ring N isotopic ratio increased with increasing latitude and decreasing N availability in pine stands across Finland Open
Since nitrogen (N) is the main forest-growth limiting nutrient in the boreal region, atmospheric N deposition may be an important source of available soil N. The objective of the study was to determine whether the variation in N deposition…
View article: Depositional history of peatland pines (<i>Pinus sylvestris</i> L.) in NW Enontekiö, Finnish Lapland: implications for Middle Holocene drought and temperature fluctuations
Depositional history of peatland pines (<i>Pinus sylvestris</i> L.) in NW Enontekiö, Finnish Lapland: implications for Middle Holocene drought and temperature fluctuations Open
High altitude and latitude findings of subfossil peatland pine trees were unearthed from the region of NW Finnish Lapland and dated by 14 C and tree‐ring methods. The depositional history of the trees illustrated two distinct peatland pine…
View article: A critical thermal transition driving spring phenology of Northern Hemisphere conifers
A critical thermal transition driving spring phenology of Northern Hemisphere conifers Open
Despite growing interest in predicting plant phenological shifts, advanced spring phenology by global climate change remains debated. Evidence documenting either small or large advancement of spring phenology to rising temperature over the…
View article: Disentangling the Evidence of Milankovitch Forcing From Tree-Ring and Sedimentary Records
Disentangling the Evidence of Milankovitch Forcing From Tree-Ring and Sedimentary Records Open
Tree-ring records constitute excellent high-resolution data and provide valuable information for climate science and paleoclimatology. Tree-ring reconstructions of past temperature variations agree to show evidence for annual-to-centennial…
View article: Subfossil Scots Pine (Pinus sylvestris L.) Wood from Northern Finland—Physical, Mechanical, and Chemical Properties and Suitability for Specialty Products
Subfossil Scots Pine (Pinus sylvestris L.) Wood from Northern Finland—Physical, Mechanical, and Chemical Properties and Suitability for Specialty Products Open
The physical, mechanical, and chemical properties of both stem wood and knot wood were investigated from two subfossil Scots pine (Pinus sylvestris L.) trunks retrieved from a lake in Finnish Lapland, dated to 404–486 CE and to 1318–1444 C…
View article: Long-term response of soil and stem wood properties to repeated nitrogen fertilization in a N-limited Scots pine stand
Long-term response of soil and stem wood properties to repeated nitrogen fertilization in a N-limited Scots pine stand Open
Nitrogen is the nutrient mainly limiting forest growth on mineral soil sites in the boreal regions. The objective of this study was to find out the response of stem wood N to repeated fertilizations and to find out their long-lasting effec…
View article: Recent unexpected decline of forest growth in North Finland: examining tree-ring, climatic and reproduction data
Recent unexpected decline of forest growth in North Finland: examining tree-ring, climatic and reproduction data Open
After a decades-long increasing trend, the recent results of the National Forest Inventory (NFI) reported a decline of forest growth in North Finland. The aim of this study was to assess climatic and reproduction influences behind the grow…
View article: Corrigendum to “Distinct patterns of below- and aboveground growth phenology and litter carbon inputs along a boreal site type gradient” [For. Ecol. Manage. 489 (2021) 119081]
Corrigendum to “Distinct patterns of below- and aboveground growth phenology and litter carbon inputs along a boreal site type gradient” [For. Ecol. Manage. 489 (2021) 119081] Open
View article: Site carrying capacity of Norway spruce and Scots pine stands has increased in Germany and northern Europe
Site carrying capacity of Norway spruce and Scots pine stands has increased in Germany and northern Europe Open
The maximum size-density relationship describes site carrying capacity, i.e., the maximum number of trees of a given size that can be stocked per unit area (self-thinning line). We analysed whether the self-thinning lines of Norway spruce …
View article: Distinct patterns of below- and aboveground growth phenology and litter carbon inputs along a boreal site type gradient
Distinct patterns of below- and aboveground growth phenology and litter carbon inputs along a boreal site type gradient Open
Forest ecosystem productivity is strongly linked to site nutrient availability, which is influenced by litter inputs and their decomposition rates. Fine roots and mycelia are key contributors in belowground soil carbon (C) accumulation, bu…
View article: Recurrent transitions to Little Ice Age-like climatic regimes over the Holocene
Recurrent transitions to Little Ice Age-like climatic regimes over the Holocene Open
View article: Suomen metsien käytön rajat: Mera-aikakauden skenaariolaskelman tarina
Suomen metsien käytön rajat: Mera-aikakauden skenaariolaskelman tarina Open
Suomen metsävarojen riittävyys herätti huolestuneisuutta 1960-luvun alkupuolella poistuman ylitettyä puuston kasvun useina vuosina. Ryhmä tunnettuja metsäntutkijoita arvioi vuonna 1965, että silloinen puunkäyttö yhdistettynä metsäteollisuu…
View article: Reply to Elmendorf and Ettinger: Photoperiod plays a dominant and irreplaceable role in triggering secondary growth resumption
Reply to Elmendorf and Ettinger: Photoperiod plays a dominant and irreplaceable role in triggering secondary growth resumption Open
International audience
View article: CAN THE<sup>14</sup>C PRODUCTION IN 1055 CE BE AFFECTED BY SN1054?
CAN THE<sup>14</sup>C PRODUCTION IN 1055 CE BE AFFECTED BY SN1054? Open
Annually resolved radiocarbon ( 14 C) measurements on tree rings led to the discovery of abrupt variations in 14 C production attributed to large solar flares. We present new results of annual and subannual 14 C fluctuations in tree rings …
View article: Photoperiod and temperature as dominant environmental drivers triggering secondary growth resumption in Northern Hemisphere conifers
Photoperiod and temperature as dominant environmental drivers triggering secondary growth resumption in Northern Hemisphere conifers Open
Significance Forest trees can live for hundreds to thousands of years, and they play a critical role in mitigating global warming by fixing approximately 15% of anthropogenic CO 2 emissions annually by wood formation. However, the environm…
View article: Nitrogen deposition is the most important environmental driver of growth of pure, even-aged and managed European forests
Nitrogen deposition is the most important environmental driver of growth of pure, even-aged and managed European forests Open
View article: Size-class structure of the forests of Finland during 1921–2013: a recovery from centuries of exploitation, guided by forest policies
Size-class structure of the forests of Finland during 1921–2013: a recovery from centuries of exploitation, guided by forest policies Open
Frequency distributions of tree diameters are a powerful tool for analyzing changes of tree populations in large areas. We analyzed the densities and mean volume estimates of trees in different size classes for the Finnish forests over the…
View article: Sprinkling infiltration as an artificial groundwater recharge method – Long-term effects on boreal forest soil, tree growth and understory vegetation
Sprinkling infiltration as an artificial groundwater recharge method – Long-term effects on boreal forest soil, tree growth and understory vegetation Open
The artificial recharge of groundwater by infiltrating surface water through forest soil has been introduced as a groundwater producing practice in Finland. As a result, the forest soil, as well as the whole ecosystem, is subjected to extr…