Search Results - "Sievänen, R."

Root discoloration and shoot symptoms in silver birch after Phytophthora infection in vitro by Hamberg, L., Poimala, A., Velmala, S., Perttunen, J., Muilu‐Mäkelä, R., Sievänen, R., Pastor, V.

“…There are no records of established plant pathogenic Phytophthora species in Finnish forests, but they are likely in the future. Therefore, the effects of…”
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Biomass expansion factors (BEFs) for Scots pine, Norway spruce and birch according to stand age for boreal forests by Lehtonen, A, Mäkipää, R, Heikkinen, J, Sievänen, R, Liski, J

“…Assessments of forest resource in national inventories provide a firm basis for quantifying forest biomass and carbon stock. National statistics on forest…”
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Modelling of reserve carbohydrate dynamics, regrowth and nodulation in a N2‐fixing tree managed by periodic prunings by Berninger, F., Nikinmaa, E., Sievänen, R., Nygren, P.

“…ABSTRACT We used a modified transport resistance approach to model legume tree growth, nodulation and dynamics of reserve carbohydrates after pruning. The…”
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Predicting the activity of Heterobasidion parviporum on Norway spruce in warming climate from its respiration rate at different temperatures by Müller, M. M., Sievänen, R., Beuker, E., Meesenburg, H., Kuuskeri, J., Hamberg, L., Korhonen, K.

“…Summary We studied the effect of climate warming on Heterobasidion root rot in boreal forests by measuring respiration activity of pure cultures of…”
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Introducing effects of temperature and CO2 elevation on tree growth into a statistical growth and yield model by MATALA, J, OJANSUU, R, PELTOLA, H, SIEVÄNEN, R, KELLOMÄKI, S

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Hotspots of the European forests carbon cycle by Nabuurs, G.J., Thürig, E., Heidema, N., Armolaitis, K., Biber, P., Cienciala, E., Kaufmann, E., Mäkipää, R., Nilsen, P., Petritsch, R., Pristova, T., Rock, J., Schelhaas, M.J., Sievanen, R., Somogyi, Z., Vallet, P.

“…This paper is the outcome of a group discussion held at the Savonlinna meeting ‘Management of forest ecosystems and its impact on the GHG budget’. The aim of…”
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Predicting the decomposition of Scots pine, Norway spruce, and birch stems in Finland by Mäkinen, Harri, Hynynen, Jari, Siitonen, Juha, Sievänen, Risto

“…Models were developed for predicting the decomposition of dead wood for the main tree species in Finland, based on data collected from long-term thinning…”
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LIGNUM: a model combining the structure and the functioning of trees by Perttunen, J, Sievänen, R, Nikinmaa, E

“…The model LIGNUM treats a tree as a collection of a large number of simple units that correspond to the organs of a tree. The model describes the…”
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Comparison of a physiological model and a statistical model for prediction of growth and yield in boreal forests by Matala, J., Hynynen, J., Miina, J., Ojansuu, R., Peltola, H., Sievänen, R., Väisänen, H., Kellomäki, S.

“…The structural and functional properties of a physiological model (FinnFor) and a statistical model (Motti), developed independently, were analysed in order to…”
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Analysis of biomass accumulation and stem size distributions over long periods in managed stands of Pinus sylvestris in Finland using the 3-PG model by Landsberg, J, Makela, A, Sievanen, R, Kukkola, M

“…We tested the performance of a process-based model (PBM) in relation to long-term mensuration data from two sites in Finland where the stands were up to 90…”
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Shoot growth and crown development: effect of crown position in three-dimensional simulations by Nikinmaa, Eero, Messier, Christian, Sievänen, Risto, Perttunen, Jari, Lehtonen, Mika

“…Trees have been increasingly considered as modular organisms, with individual shoots forming autonomous units that respond semi-independently to their…”
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Introducing effects of temperature and CO 2 elevation on tree growth into a statistical growth and yield model by Matala, J., Ojansuu, R., Peltola, H., Sievänen, R., Kellomäki, S.

“…Impacts of elevated temperature and CO 2 on tree growth were introduced into a statistical growth and yield model for Finnish conditions based on corresponding…”
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Forest soil carbon stock estimates in a nationwide inventory: evaluating performance of the ROMULv and Yasso07 models in Finland by Lehtonen, Aleksi, Linkosalo, Tapio, Peltoniemi, Mikko, Sievänen, Risto, Mäkipää, Raisa, Tamminen, Pekka, Salemaa, Maija, Nieminen, Tiina, Ťupek, Boris, Heikkinen, Juha, Komarov, Alexander

“…Dynamic soil models are needed for estimating impact of weather and climate change on soil carbon stocks and fluxes. Here, we evaluate performance of Yasso07…”
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LIGNUM: A Tree Model Based on Simple Structural Units by PERTTUNEN, J., SIEV ÄNEN, R., NIKINMAA, E., SALMINEN, H., SAARENMAA, H., V ÄKEV Ä, J.

“…The model LIGNUM treats a tree as a collection of a large number of simple units which correspond to the organs of the tree. The model describes the three…”
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Effects of age and site quality on the distribution of biomass in Scots pine (Pinus sylvestris L.) by Vanninen, P, Ylitalo, H, Sievaenen, R, Maekelae, A. (Helsinki Univ. (Finland). Dept. of Forest Ecology)

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Predicting the activity of Heterobasidion parviporum on N orway spruce in warming climate from its respiration rate at different temperatures by Müller, M. M., Sievänen, R., Beuker, E., Meesenburg, H., Kuuskeri, J., Hamberg, L., Korhonen, K.

“…Summary We studied the effect of climate warming on H eterobasidion root rot in boreal forests by measuring respiration activity of pure cultures of H…”
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Modelling of reserve carbohydrate dynamics, regrowth and nodulation in a N 2 ‐fixing tree managed by periodic prunings by Berninger, F., Nikinmaa, E., Sievänen, R., Nygren, P.

“…ABSTRACT We used a modified transport resistance approach to model legume tree growth, nodulation and dynamics of reserve carbohydrates after pruning. The…”
Get full text

Application of volume growth and survival graphs in the evaluation of four process-based forest growth models by Mäkelä, Annikki, Sievänen, Risto, Lindner, Marcus, Lasch, Petra

“…Volume growth and survival (VGS) graphs, which show volume growth rate and risk of mortality for individual trees (or tree size classes), have been proposed as…”
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Carbon and decomposition model Yasso for forest soils by Liski, Jari, Palosuo, Taru, Peltoniemi, Mikko, Sievänen, Risto

“…Models are needed to estimate dynamics of carbon in forest soils, because changes in soil carbon are laborious to measure, and future levels of soil carbon can…”
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Volume growth and survival graphs: a method for evaluating process-based forest growth models by Sievänen, Risto, Lindner, Marcus, Mäkelä, Annikki, Lasch, Petra

“…We investigated the relationships within forest stands between tree size and (a) stem volume growth rate and (b) risk of mortality for individual trees. Values…”
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