Grillenburg

Currently the TU Dresden (Chair of Meteorology) operates 6 monitoring sites to measure energy, water and greenhouse gas exchanges of different land uses including 4 sites (Tharandt, Grillenburg, Klingenberg, Hetzdorf) within the framework of the ICOS-D ecosystem component (TU Dresden or Tharandt cluster).

At the grassland site Grillenburg (50°57’04”N, 13°30’50”E, 380 m a.s.l.) in central Saxony EC measurement start was in 2002. The permanent grassland is unfertilized since 1987 and is extensively managed (one to three cuts per year, occasional cattle or sheep grazing in autumn). The soil carbon stock (0-60 cm depth) is 72.7 tC ha^-1 (2008), the C/N ratio is 11.9 (soil) and 11.9 - 19.5 (plants), respectively.

The EC measurement setup consists of ultrasonic anemometers (GILL R3-50, Gill Instruments, Lymington, UK or METEK USA-1, METEK GmbH, Elmshorn, Germany) and closed- or open-path gas analyzers LI-7000 and LI-7500 (LiCor Inc., Lincoln, NE, USA), respectively. The site is also equipped with measurements of radiation components, air temperature and humidity, precipitation as well as soil and biomass observations. Management information of the Colmnitzer Agrargenossenschaft are available.

Since 2005 the mean net CO₂ sink (net ecosystem productivity) is 80 gC m^-2 a^-1. Including carbon export due to cuts the ecosystem switches to a CO₂ source of 60 gC m^-2 a^-1 (net biome productivity). The ratio of net ecosystem productivity and gross primary production is 0.04. The (corrected) annual evapotranspiration rate is between 590 mm (2010) and 750 mm (2015) whereas the (corrected) precipitation is from 930 mm a^-1 (2011) to 1330 mm a^-1 (2010). So, the mean evaporative fraction is 63% of precipitation and 90% of available energy, respectively.

PI: Prof. Dr. Matthias Mauder, TU Dresden, Chair of Meteorology

Site manager: Dr. Thomas Grünwald, TU Dresden, Chair of Meteorology