123 research outputs found
The effect of temperature and PAR on the annual photosynthetic production of Scots pine in northern Finland during 1906–2002
Get PDFEffect of emissions from the nickel-copper smelter in Monchegorsk, northwestern Russia, on the radial growth of Scots pine.
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Automatic detection of onset and cessation of tree stem radius increase using dendrometer data and CUSUM charts
Get PDFResponse of boreal forest vegetation to the fertility status of the organic layer along a climatic gradient
Get PDFForest condition monitoring under the UN/ECE and EU programmes in Finland
Get PDFPart of the online report: Merilä, P. & Jortikka, S. (eds.). Forest Condition Monitoring in Finland – National report. The Finnish Forest Research Institute. http://urn.fi/URN:NBN:fi:metla-201305087568.
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Geographical patterns in the radial growth response of Norway spruce provenances to climatic variation
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Separating water-potential induced swelling and shrinking from measured radial stem variations reveals a cambial growth and osmotic concentration signal
Get PDFThe quantification of cambial growth over short time periods has been hampered by problems to discern between growth and the swelling and shrinking of a tree stem. This paper presents a model, which separates cambial growth and reversible water-potential induced diurnal changes from simultaneously measured whole stem and xylem radial variations, from field-measured Scots pine trees in Finland. The modelled growth, which includes osmotic concentration changes, was compared with (direct) dendrometer measurements and microcore samples. In addition, the relationship of modelled growth and dendrometer measurements to environmental factors was analysed. The results showed that the water-potential induced changes of tree radius were successfully separated from stem growth. Daily growth predicted by the model exhibited a high correlation with the modelled daily changes of osmotic concentration in phloem, and a temperature dependency in early summer. Late-summer growth saw higher dependency on water availability and temperature. Evaluation of the model against dendrometer measurements showed that the latter masked a true environmental signal in stem growth due to water-potential induced changes. The model provides better understanding of radial growth physiology and offers potential to examine growth dynamics and changes due to osmotic concentration, and how the environment affects growth.Peer reviewe
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