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We studied the intra-annual wood formation in a Norway spruce provenance experiment in southern Finland from 2004–2008. Two Finnish provenances, northern and southern, as well as German and Hungarian provenances were included. Timing of tracheid formation and differentiation, and tracheid dimensions were determined from periodically extracted microcores. The aim was to determine the differences between...
We analyzed the statistical dependence between temperature, the state of functional substances (S), estimated photosynthetic production and the radial growth of Scots pine in northern Finland. Annual sums of these variables were calculated for intervals consisting of consecutive calendar days. For daily mean temperature, all possible intervals between 1 April of the previous year and 31 August of...
Photosynthetically active radiation (PAR) is a key variable needed for running process models that describe the functioning of agricultural crops or forest trees. Actual measured data that covers sufficiently long periods on PAR is usually not available for most research sites. Also, existing data usually consists of temporal averages, which - given the non-linear response of the photosynthetic rate...
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