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Methods of Forest Growth Research

Methods for high-resolution assessment of density variation along cross sections using dielectric dispersed slit probe.

Growth zones in tree rings reflect growth conditions during wood formation. High frequency densitometry, developed at the Institute for Forest Growth, is a simple to apply method to assess density profiles in tree rings similar on the more laborious X-ray densitometry. High frequency densitometry identifies density variations at the surface of wood. Because of the linear relation between wood density and the dielectric permittivity the electrical signal gained from scanning can be converted in density values after calibration. The measurement depth is defined by the size of the electrical field and depends on the size of the slit of the probe. Several probes are developed at the institute for different purposes of measurement with different special resolution. In this project the high frequency densitometry is further developed.

 

ResearchersMartin Schinker, Simon Boden, Prof. Dr. Heinrich Spiecker
FundingInstitute for Forest Growth
Durationlong term

 

 

EU-project – FlexWood „Flexible forest-wood chain“

Within the EU-project „FlexWood“ a modern, logistic system will be developed, which integrates advanced quality and quantity information on wood resources, measured in the forest with novel technologies. It offers optimisation models for tactical and operational planning (bucking, harvesting, allocation of wood). It therefore models and enhances processes for novel and more flexible concepts for mill production and helps to improve the information transfer between all stages of the wood supply chain to create new knowledge for decision-making.
The FlexWood project helps to meet the market demands with innovativ, logistic concepts providing better information on wood resources and enhanced optimisation models. This will lead to a better and faster respond to the demands of the different industry sectors, which will lead to an increase in value recovery.

The Institute for Forest Growth applies terrestrial laser scan data to assess and analyze tree quality attributes in more detail. In this part of the project the internal quality of trees will be predicted by investigating the outside of the stem and connecting patterns in the recorded exterior view of a standing tree with wood quality inside the frame.
 

Project webpage

ResearchersUrsula Kretschmer, Prof. Dr. Heinrich Spiecker
FundingEU
Duration01 .11.2009-30.10.2012

 

 
 

Using tree rings as an archive for environmental conditions

Environmental influences as for example changes in climate and weather in competition, and also in abiotic and biotic influences have an effect on the anatomic structure, as well as on the physical and chemical properties of tree rings. Tree rings can be dated back over many centuries. Therefore, they offer a valuable insight into former environmental conditions. The aim of this research at the Institute for Forest Growth is to identify the information stored in these tree rings and to make this information available for environmental research. For this purpose, methods for the preparation of large surfaces of cross sections, computer-supported measurements of cell structure with optical and mechanical tools as well as physical and chemical properties in high spatial resolution are used and their diagnostic value for dendroecological research topics is checked.

Researchers   Dr.Martin Schinker,   Willi Tegel, Prof. Dr. Heinrich Spiecker
 Partner Institut für Forsten, Krasnojarsk/Rußland

 

 

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