A dendrochronology program library in R (dplR)

Bunn, A. G.

doi:10.1016/j.dendro.2008.01.002

Cited by 1,623 publications

(1,127 citation statements)

References 2 publications

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“…The ''n-year spline'' was fixed at 2/3 the wavelength of n years (Cook et al 1990). The residual version of the chronology was built by pre-whitening, performed by fitting an autoregressive model to the data with AIC model selection (Bunn 2008). Hierarchical cluster analysis (Ward method) was used as implemented in the amap R package (Author: Lucas) to separate the tree-ring series from each site and to distinguish regions with similar increment patterns (Wilson and Hopfmueller (2001).…”

Section: Chronology Developmentmentioning

confidence: 99%

“…Both the skeleton plot method and the results from the COFECHA programme were used for evaluating and detecting narrow and wide rings. De-trending of the chronology was done with the dplR software (Bunn 2008) using the smoothing spline option, which reflects trends in the chronology better than other options. The ''n-year spline'' was fixed at 2/3 the wavelength of n years (Cook et al 1990).…”

Section: Chronology Developmentmentioning

confidence: 99%

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Long-term increase of March temperature has no negative impact on tree rings of European larch (Larix decidua) in lowland Poland

Koprowski

2012

Trees

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European larch trees grown outside their natural range were intensively studied in terms of their adaptability to increased late winter temperature. A total of 264 cores of larch were taken from 12 sites throughout northern Poland at sites outside of its natural range. Clustering of de-trended chronologies reveal that research sites are grouped geographically. The mean ring widths, however, are similar amongst the four regions. In total, 21 % of the single correlations for all months for tree-ring widths were significant at the 5 % error level. For earlywood and latewood, the figures are 18 and 19 %, respectively. A generally positive precipitation effect was found, however, no significant negative effect was observed. Temperature had mixed effects on ring width. Higher temperatures in late winter and early spring increased ring width in region 2. High summer temperatures in both the previous and the current year, on the other hand, generally had a negative impact on tree-ring width during the growing season. On most of the sites, the observed long-term trend for increasing temperatures in March had no significant negative influence on tree growth. The visual condition of European larch together with the lack of any negative response of tree rings to observed March temperature increase suggest that it may be beneficial to introduce this species into new areas.

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Section: Chronology Developmentmentioning

confidence: 99%

Section: Chronology Developmentmentioning

confidence: 99%

Long-term increase of March temperature has no negative impact on tree rings of European larch (Larix decidua) in lowland Poland

Koprowski

2012

Trees

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“…The wide availability of support for TRiDaS in popular dendrochronological programs will be essential for the continued growth and adoption of TRiDaS. As of the time of writing, the applications capable of reading and/or writing TRiDaS files include Tellervo, TRiCYCLE (Brewer et al 2011), TRiDaBASE (Jansma et al 2012a), DCCD (Jansma et al 2012b), and dplR (Bunn 2008). This article will focus on the use of the Tellervo application.…”

Section: S81 Data Management In Dendroarchaeology Using Tellervomentioning

confidence: 99%

Data Management in Dendroarchaeology Using Tellervo

Brewer

2014

Radiocarbon

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The Tellervo dendrochronological software builds upon the Tree-Ring Data Standard (TRiDaS) to provide a tool for recording and managing all manner of dendrochronological data. However, Tellervo is especially useful for dendroarchaeological research. The traditional file formats used in dendrochronology-and by association the applications that use them-have very limited and nonstandard methods for recording rich information about dendro samples and their context. Such information is especially important in dendroarchaeological research to ensure accurate conclusions are made. Tellervo is described here in the context of research carried out as part of the excavations of the Theodosian Harbor at Yenikapı, Istanbul.

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“…The effect of outliers was minimized using Tukey's bi-weight robust method (Cook et al 1990). A residual version of the chronology was built by pre-whitening after fitting an autoregressive model to the data using the Akaike information criterion (AIC) for variable selection (Bunn 2008). Additionally, the expressed population signal (EPS) was calculated as a measure of the common signal in the chronology (Wigley et al 1984).…”

Section: Tree Ringsmentioning

confidence: 99%

“…Initially, in order to analyse the effect of meteorological parameters on tree rings the long-term trends in tree rings were removed. The smoothing spline option of the dplR package (Bunn 2008) from R (R Development Core Team 2007) was used to detrend the temporal data series. The ''nyear spline'' at 2/3 the wavelength of n years was used, after Cook et al (1990).…”

Section: Tree Ringsmentioning

confidence: 99%

The application of potato starch effluent causes a reduction in the photosynthetic efficiency and growth of Scots pine (Pinus sylvestris L.)

Koprowski

Robertson

Wils

et al. 2015

Trees

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Key message The high concentration of N and K caused a weakening of physiological conditions of the trees. Application of N, P and K from starch effluent is not a suitable method of waste management. Abstract Since 1984, potato starch effluent has been applied to trees in the Iława Forest Inspectorate to promote the biological utilization of this waste product containing high amounts of nitrogen (N), phosphorus (P) and potassium (K). We examined the tree rings of Scots pine (Pinus sylvestris L.) to study the effect of intensive fertilization on tree rings. A total of 120 samples were taken from three sites representing a fertilized and unfertilized area and trees growing at a control site, outside the forest waste water system. We found that February and March temperature influenced the growth of tree rings. We used multiple regression to investigate the influence of N, P and K concentration, the amount of waste water and February and March temperature upon tree growth. Akaike information criterion (AIC) model selection was applied to choose the most influential factors upon growth, and additional multiple regression analyses were performed for two subsets of variables. Trees growing on the unfertilized site responded positively to N content and negatively to P content. For the fertilized site, the high concentration of N and K together with decreasing volume of waste water caused a growth decline. Trees from fertilized area also showed a decrease in their photosynthetic efficiency.

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A dendrochronology program library in R (dplR)

Cited by 1,623 publications

References 2 publications

Long-term increase of March temperature has no negative impact on tree rings of European larch (Larix decidua) in lowland Poland

Long-term increase of March temperature has no negative impact on tree rings of European larch (Larix decidua) in lowland Poland

Data Management in Dendroarchaeology Using Tellervo

The application of potato starch effluent causes a reduction in the photosynthetic efficiency and growth of Scots pine (Pinus sylvestris L.)

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