Ring-width data of sea-buckthorn
The ring-width data of sea-buckthorn (Hippophae rhamnoides L.) was collected in the eastern part of the Wadden Island of Ameland (53°27'43"N, 5° 54'12"E). The aim was to assess the sea-buckthorn population dynamics over time by relating the data to different environmental factors such as precipitation, temperature, groundwater, sea water floods, and outbreaks of the brown-tail moth (Euproctis chrysorrhoea L.). More information can be found in the publication entitled: "Population dynamics of the shrub sea-buckthorn as indicator of sea-level rise and insect outbreaks".
Steps to reproduce
The samples were randomly selected and obtained by harvesting a stem segment at the base of the shrub. A total of 196 discs from sea-buckthorn shrubs were taken at the end of 2015. The upper disc surface was cut with a sharp razor blade to expose the tree rings. Tree-ring widths were measured using a Lintab measuring table and TSAP-Win software (Rinntech). Multiple radii were measured when possible to improve the precision of the measurements. Individual series were visually cross-dated first within a shrub and then between shrubs per stratum (we had 6 strata). The shrub growth series were detrended to correct for age related growth trends using Regional Curve Standardization (Cook and Kairiukstis, 1990) in which a modified negative exponential curve was fitted through the radial growth vs age plot, and ratios for each year of each sample were determined (Helama et al., 2016; Fritts, 1969). More information can be found in the publication entitled: "Population dynamics of the shrub sea-buckthorn as indicator of sea-level rise and insect outbreaks". References: Cook, E.R., Kairiukstis, L.A., 1990. Methods of Dendrochronology: Applications in the Environmental Sciences. Springer Science & Business Media Dordrecht. https://doi.org/10.1007/978-94-015-7879-0 Fritts, H.C., 1969. Bristlecone pine in the White Mountains of California: growth and ring-width characteristics, Papers of the Laboratory of Tree-Ring Research, no. 4. University of Arizona Press, Tucson. Helama, S., Melvin, T.M., Briffa, K.R., 2016. Regional curve standardization: State of the art. The Holocene 27, 172–177. https://doi.org/10.1177/0959683616652709