Workshops and Excursions

TRACE 2022 is accompanied by several workshops and excursions. Registration for the workshops is done via the online conference registration process on a first-come, first-serve basis.
Registration starting Saturday, January 15th, 2022.

Monday, May 23rd

Blue intensity (lecturer: Ryszard Kaczka )

Introduction to Blue Intensity
Organiser: Ryszard J. Kaczka, Charles University in Prague
Duration: 6h

During the last 20 years Blue Intensity (BI) has gained recognition as a reliable and practical tree-ring parameter used in dendroclimatology and other branches of tree-ting research. Blue Intensity is strongly related to wood density however the measurement is based on optical properties of the wood and thus can be made relatively easily using digital images of the wood surface of samples.

The workshop is dedicated to beginners with little of no knowledge of Blue Intensity. We will introduce theoretical and practical basics of the BI method, from sampling to statistical analyses. We will talk about available tools and possible applications. The examples of relevant utilization of BI will be provided by several on-line guests (Jesper Bjoerklund, Karen Heeter, Milos Rydval, Kristina Seftigen, Rob Wilson). The workshop will focus on practical training of BI measurement and BI data processing.

Requirements: A laptop running Windows, sufficient supply of coffee.

A fee of 20€ will be collected during the workshop.

Participant limit: 10
Stable isotope analysis (lecturers: Achim Bräuning, Christoph Mayr )

Stable Isotope Analysis

Lecturers: Dr. Christoph Mayr; Prof. Dr. Achim Bräuning

Stable isotope analysis are an established, but still innovative approach to extract environmental information from trees. However, there exist a multitude of technical and ecological aspects to be considered in the design of stable isotope studies using trees and forest ecosystems in different climatological and environmental settings. We will start with introductory lectures on stable isotope theory and fractionation of different isotope species in trees (morning until coffee break). Then, we will discuss preparation methods for isotope samples in wood at different temporal resolution and different approaches to create isotope chronologies (until lunchtime). In the afternoon, practical steps of cellulose extraction and isotope analyses will be demonstrated in the laboratory. Finally, we will discuss different aspects of data treatment and fields of application of stable isotopes in tree rings for climatological and ecological research.

Tree-ring Laboratory of the Institute of Geography (Bismarckstraße 1, 91054 Erlangen), and Stable Isotope Laboratory (Henkestraße 9-11, 91054 Erlangen)

Time Schedule:
The workshop will take part on Monday, May 23 from 9:00 to 17:00.

Participant limit: 15

Tuesday, May 24th

dendRoschool (lecturers: Allan Buras, Jernej Jevšenak )

1. Advanced workshop on dendroTools R package – Jernej Jevšenak

The R package dendroTools allows the analyses between tree rings and daily resolution climate data in very popular R environment. In the workshop, we will introduce new features of dendroTools and show advanced approaches to perform statistical analysis between daily climate data and different tree ring proxies. More specifically, we will present different approaches to calculate climate-growth correlations using the Standardised Precipitation-Evapotranspiration Index (SPEI), calculate the temporal stability of correlations and explore the impact of extreme years on tree-ring proxies. All participants are advised to watch the introductory videos on dendroTools (here and here), as the basics will not be covered in this workshop.

2. Introduction to the rTG R package for the analysis of seasonal radial tree growth data – Jernej Jevšenak

The monitoring of seasonal radial tree growth offers unique insights into the temporal growth dynamics of woody species. One of the crucial steps in the analyses of seasonal radial growth is to model the dynamics of xylem and phloem formation based on increment measurements on samples taken at relatively short intervals during the growing season. In the workshop, we will introduce newly developed rTG (radial tree growth) R package, which can be used to evaluate and compare three modelling approaches: Artificial Neural Networks, General Additive Models and the Gompertz function.

3. New functions in the dendRolAB package: Transfer function stability tests and pointer year detection – Allan Buras

Testing the stability of transfer functions and identifying pointer years render central tools of tree-ring analyses. Within this context, I here introduce two novel methods of the dendRolAB package. Theoretical fundamentals of the methods are explained and corresponding functions in the dendRolAB package exemplified. Workshop participants are required to have basic ‘R’-experience (see here) and will be provided further information material in advance of the workshop.

Preliminary Schedule
9:00 – 10:45 Advanced workshop on dendroTools R package (Jernej Jevšenak)
10:45 – 11:00 Coffee break
11:00 – 12:00 Introduction to the rTG R package (Jernej Jevšenak)
12:00 – 13:30 Lunch break
13:30 – 14:45 BTFS: Bootstrapped transfer function stability test (BTFS, Allan Buras)
14:45 – 15:00 Coffee break
15:00 – 16:30 BSGC: Bias-corrected standardized growth change method (BSGC, Allan Buras)

Location: Institute of Geography, Wetterkreuz 15, 91058 Erlangen-Tennenlohe, Ground floor, Cip-Pool

Participant limit: 15
Design and deliver effective scientific presentations (lecturer: Dr. Allan Crivellaro )

Design and deliver effective scientific presentations

The most successful scientist are good presenters. By mastering the art of effective presentations, they achieve extraordinary collaborations and results, no matters their career stage. As a modern-day scientist, you know you should develop your presentation skills, but you do not find the time to do this in a comprehensive way. This workshop offers you with a practical, reliable guide to follow, one that will allow your science to spread among your community and beyond.

Date and Duration of the workshop: Tuesday, May 24, 9.00-17.00

Location: tba

Participant limit: 25

Mid-conference excursion

Guided city tour in Nürnberg

A guided city walk through the restored medieval city center of Nürnberg will be made, introducing historic aspects of the city as well as modern day attractions.

Participation fee inkl. public transportation to and from Nuernberg: 15 € per person.

Post-conference excursion

Tour through the Franconian Switzerland

The excursion will offer a tour through the “Franconian Switzerland”, a limestone middle mountain region close to Erlangen which is a Nature Park including several conservancy areas. The region offers fantastic landscape features related to karst geomorphology, including rock towers, gorges, caves, and small rivers. Besides, we will see special forest and other vegetation types and a rich cultural landscape. Our coach will stop at several locations, where we will have short walk to spectacular landforms and vegetation stops. Per participant, a fee of 25 Euros is charged, including transportation and lunch. Signing-up for the excursion is possible upon registration.