Veeneiken - sleutel tot het verleden landschap en klimaat?

Veeneiken zijn (veen)restanten van eiken uit moerasbossen op laagveen. Ze vormen interessant materiaal voor dendrochronologisch onderzoek. Er is voor deze eiken inmiddels een chronologie opgebouwd over de jaren 3600 BC tot 563 AD. Onderzoek aan veeneiken in Nederland en Noordwest-Europa en aan twee (pre)historische moerasbossen in Nederland (locaties Zwolle en Ypenburg) wordt gebruikt voor landschap- en klimaatreconstructi

Clusters of Quercus robur and Q. petraea at the Veluwe (the Netherlands)

In this report three main questions were studied: (1) are oak clusters genetically identical, (2) can leaf morphology be used to identify clonal structures of oak and (3) what is the origin of oak clusters. The study sites were situated in a drift sand area (Maanschoten) as well as in an area with pre-glacial material (Wilde Kamp)

ROXAS – an efficient and accurate tool to detect vessels in diffuse-porous species

Wood-anatomical parameters form a valuable archive to study past limitations on tree growth and act as a link between dendrochronology and ecophysiology. Yet, analysing these parameters is a time-consuming procedure and only few long chronologies exist. To increase measurement efficiency of wood-anatomical parameters, novel tools like the automated image-analysis system ROXAS were developed. So far, ROXAS has only been applied to measure large earlywood vessels in ring-porous species. In this study, we evaluate if ROXAS is also suitable for efficient and accurate detection and measurement of vessels in diffuse-porous European beech. To do so, we compared the outcome of ROXAS with that of the established measurement programme Image-Pro Plus in terms of efficiency and accuracy. The two methods differed substantially in efficiency with automatic measurements using ROXAS being 19 times faster than with Image-Pro Plus. Although the procedures led to similar patterns in annual variation of mean vessel area and vessel density, the absolute values differed. Image-Pro Plus measured systematically lower mean vessel areas and higher vessel densities than ROXAS. This was attributed to the species-specific technical settings in ROXAS, leading to more realistic results than those obtained using the default settings in Image-Pro Plus. A shortcoming of ROXAS was, however, that small vessels

Eikenclusters op de Veluwe

Op de Veluwe worden op verschillende plekken groepen eiken aangetroffen. Mogelijk behoren ze tot oorspronkelijk inheems materiaal, en zijn ze ontstaan uit hakhout. In dat geval is sprake van een cultureel erfgoed. In opdracht van Gelders Landschap worden momenteel eikenclusters onderzocht op hun ontstaansgeschiedenis

Tree physiology: Tracking tree carbon gain

Wood formation drives the storage of carbon in trees and other woody plants. A detailed analysis of conifer xylem tissue formation reveals how the intra-annual dynamics of biomass production are recorded in wood

DCCD - contribution Wageningen University (WUR)

These files contain dendrochronological data and metadata from natural sites from The Netherlands collected by the Wageningen University and Research Centre (WUR). You can consult the complete DCCD database online