Abstract
In 1892 a forest spacing experiment with four different spacing patterns was established with Norway spruce (Picea abies). From 1923 until 1997, when the stand was harvested, diameter, height and height to crown base of in total 4507 trees were measured up to 23 times. The original aim of the experiment during establishment was to analyse short term effects of different spacing patterns. The thinning regime followed state of the art forestry practises. During the observation time of more than 100 years, the individual observers and the measurement technology changed several times. Thus, the raw measurement data contain systematic and unsystematic measurement errors as well as missing data. We developed methods to complete missing data, smoothen implausible developments, and correct measurement errors. The data provided in the present study include spatially explicit individual-tree growth data which can be used to analyse the development of forest stands and its individual trees during one rotation period. The data can be used e.g. to parameterize and validate forest growth and competition models.
Highlights
Background & SummaryIn 1892, the Austrian Research Center for Forests established a spacing experiment with Norway spruce (Picea abies [L.] Karst.) in the Vienna Woods
The experiment was established in spring 1892 using three year old seedlings of Norway spruce by applying the pit-planting method
PCAB...Picea abies, PNSY...Pinus sylvestris dbh: Diameter in 1.3 m height in cm height: Tree height in m hKrown: Height of the crown base m saIr.csv: Ring width from stem analysis plot: Plot number tree: Tree number disc: Stem disc number dir: Measurement direction year: Year of radial increment ir: Radial increment in 1/100 mm saDisc.csv: Stem disc information for stem analysis plot: Plot number tree: Tree number disc: Stem disc number h: Height of the disc in m dhcComplSmooth.csv: Processed diameter, height and crown base where observation gaps are filled and values are monotone increasing using the processing stepsgiven in the file “dhc.r”
Summary
In 1892, the Austrian Research Center for Forests established a spacing experiment with Norway spruce (Picea abies [L.] Karst.) in the Vienna Woods. The measurements of individual-tree growth started in 1923 at a stand age of 35 years. In at the age of 109 years, a final survey was conducted before harvesting the remaining trees. Plots and individual trees were measured 23 times within intervals of 1 to 6 years. Additional stem disc analyses of harvested trees allowed analyzing diameter growth along the tree trunk. During this time period, the measurement equipment had changed. During the early phase of the experiment, the height was measured with bamboo poles, with ladder and tapeline. The provided spatially explicit individual-tree growth data can be used to analyse the development of individual trees and forest stands during one rotation period. It can be used to parameterize and validate forest growth models or compare different competition indices
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