ArticleFast growing hybrid poplars (Populus spp.) could be successfully used for bioenergy
as well as wood production. Productivity of clones had been studied in Baltic States recently,
however, little is known about the impact of weather conditions on poplar height growth, thus the
potential effect of climate change. Therefore, the aim of this study was to characterize the intra–
annual height growth of hybrid poplar clones in Latvia. Height increment of 12 hybrid poplar
clones was measured on average with an 11–day interval in the first vegetation season in 2016.
Annual shoot height was on average 81.0 ± 6.8 cm, significantly (p < 0.001) depending on the
poplar clone. Use of long (0.5 m) instead of short (0.3 m) cuttings leaded to larger annual height
increment during the year of establishment of the plantation. From June to September the mean
growth intensity was 10 to 15 mm day-1
. The trend of height growth intensity, described by
Gompertz model, indicated that the poplar clones with largest height had relatively fast increase
of the growth intensity from June to July. Changes of growth intensity was linked both with the
temperature and sum of precipitation. This tendency was not so pronounced for clones with
largest height increment, emphasizing the importance of the phenotypic plasticity in selection of
clones for plantations
