Field Experiments & Instrumentation / Workshops                    --- Making Things Happen ---     


Wetzstein


Location

Managed spruce forest
Tree Height 24 m

Latitude 50,45
Longitude 11,46
Elevation 781 m a.s.l.

Overview

  • Since 2001 until now
  • Eddy covariance
  • Meteorology
  • Sap flow
  • Tree growth
  • Tree temperature
  • Advex Experiment 2006
  • Second Eddy-tower from April 2006 until July 2012

Projects

Description, History

The station was built in 2001 and is located at a managed Norway spruce pure plantation, in the so called Schiefergebirge a part of the Thuringian Forest.

Energy is provided by a 230 V power line from near the Altvaterturm.

At the measuring point is an aluminium tower from the German Military (1,8 m x 1,37 m x 1,83 m). It is 30 m high and towers 8 m above the treetops.

In 2005 the station was part of the Advex-Experiment, because Advection has great influence of the right estimates of CO2 fluxes, especially at night and the aim of the experiment was to find an alternative for correcting nighttime Eddy-covariance (EC) measurements and derived CO2 budgets.

The second Eddy-tower, which was built up from April 2006 until July 2012, served to investigate the influence of the highly variable topography.

Variables & Instruments

Fluxes

  • Eddy covariance - CO2, water vapor, momentum, heat (Gill R3, LI6262)
  • Profile at 9 heights - CO2 (LI610)

Meteorology

  • Wind velocity and wind direction - 2D-ultrasonic-anemometer, Thies
  • Air pressure - pressure transmitter PTB101B, Vaisala
  • Air temperature and humidity - temperature-humidity-sensor KPC1_5-ME, Mela
  • Air temperature - ventilated thermometer Frankenberger, Friedrichs
  • Precipitation - heated tipping bucket rain gauge, Thies
  • Solar radiation - net radiometer CNR1, Kipp & Zonen
  • Terrestrial radiation - net radiometer CNR1, Kipp & Zonen
  • Photosynthetically active radiation - PAR sensor PAR Lite, Kipp & Zonen
  • Global & diffuse radiation and sunshine duration - sunshine pyranometer SPN1, Kipp & Zonen
  • Surface temperature - infrared thermometer KT15, Heitronics

Soil conditions

  • Soil temperature in 2 profiles - soil temperature sensors PT100, home-made
  • Soil moisture in 6 positions - soil moisture probes ML-2x, Delta-T
  • Soil heat flux in 5 locations - soil heat flux plates HP3/CN3, Rimco

Tree conditions

  • Tree trunk temperature in different depths - temperature sensors NTC, Campbell scientific
  • Tree growth - band dentrometer
  • Sap flow

Data acquisition

  • Meteorological data - datalogger CR23X, Campbell Scientific
  • CO2 profile data - datalogger CR10X, Campbell Scientific
  • Flux data - notebook
  • Vegetation - digital camera

Publication

Feigenwinter, C., Bernhofer, C., Eichelmann, U., Heinesch, B., Hertel, M., Janous, D., Kolle, O., Lagergren, F., Lindroth, A., Minerbi, S., Moderow, U., Molder, M., Montagnani, L., Queck, R., Rebmann, C., Vestin, P., Yernaux, M., Zeri, M., Ziegler, W., Aubinet, M. (2008). Comparison of horizontal and vertical advective CO2 fluxes at three forest sites. Agricultural and Forest Meteorology, 148(1), 12-24. doi:10.1016/j.agrformet.2007.08.013.

Moderow, U., Aubinet, M., Feigenwinter, C., Kolle, O., Lindroth, A., Molder, M., Montagnani, L., Rebmann, C., Bernhofer, C. (2009). Available energy and energy balance closure at four coniferous forest sites across Europe. Theoretical and Applied Climatology, 98(3-4), 397-412

Rebmann, C., Zeri, M., Lasslop, G., Mund, M., Kolle, O., Schulze, E. D., Feigenwinter, C. (2010). Treatment and assessment of the CO2-exchange at a complex forest site in Thuringia, Germany. Agricultural and Forest Meteorology, 150(5), 684-691. doi:10.1016/j.agrformet.2009.11.001.