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Streamflow as an ecological factor influencing radial growth of European ash (Fraxinus excelsior (L.))Koprowski, M. ...The aim of our study was to find the hydrological, precipitation and temperature signal in tree rings and selected cell parameters of European ash (Fraxinus excelsior L.) in the floodplain forest of ... the Warta River. A total of 30 samples were taken at breast height, using a Pressler borer, from 15 trees (2 samples per tree) during the 2012 vegetation season. We measured the tree-ring widths, built the chronology, selected the tree that was the best correlated with the rest, and used both samples from this tree for cell analysis. For earlywood vessels, average and total density, as well as the percentage of water conductive area were calculated for the years 1950%2011. We found that high water levels during September to January of the previous year positively influence tree growth. This finding could be associated with the accumulation of nutrients, like nitrogen, in the floodplain soil, which are then used at the beginning of the growing season or earlier, when the trees transition from the true dormancy phase to relative dormancy. Temperature at the end of winter and early spring did not play a big role in tree-ring width, whereas low temperature in February negatively affected the number and the area of the earlywood cells. In addition, precipitation during the growing season, especially in June, had a positive effect on ring width. To summarize, our research showed that in the case of European ash from lowland flood-areas, river flows had a large influence on growth. Precipitation and air temperature, which both shape the river regime and directly supply forest ecosystems with water, were also important for tree growth and tree-ring structure.Source: Ecological indicators : integrating monitoring, assessment and management. - ISSN 1470-160X (Vol. 85, 2018, str. 390-399)Type of material - article, component partPublish date - 2018Language - englishCOBISS.SI-ID - 4903078
source: Ecological indicators : integrating monitoring, assessment and management. - ISSN 1470-160X (Vol. 85, 2018, str. 390-399)
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Koprowski, M. | |
Okoński, Bernard | |
Gričar, Jožica, gozdarka | 22609 |
Puchałka, Radosław |
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