Site Info (CH-FRU)

Last update: Mar 1, 2023 @ 16:57

Site Description

Medium intensively managed grassland at 1000 m asl. The adjacent farm and facilities are part of the ETH Research Station. Eddy covariance flux measurements were started in August 2005 (tower coordinates: 47°06’57.0″ N and 8°32’16.0″ E; WGS84 47.115833, 8.537778; at 982 m asl).



  • Altitude: 982 m a.s.l.
  • Site name: Früebüel, Kt. Zug, Switzerland
  • Land cover (IGBP land classification): Grassland
  • Land use: Moderately intensive management with two cuts per year and cattle grazing in autumn.
  • Coordinates: 47°06’57.0″ N / 8°32’16.0″ E (47.115833, 8.537778) (Google Maps)
  • Location description: Früebüel is situated on the Walchwil mountain, north-east of Lake Zug. Adjacent to the experimental area lies a conservation area with a raised bog.
  • FLUXNET ID: CH-Fru (link)




Nearby meteo stations



  • Grass mixture: including ryegrass (Lolium multiflorum Lam.), meadow foxtail (Alopecurus pratensis L.), cocksfoot grass (Dactylis glomerata L.), dandelion (Taraxacum officinale agg.), buttercup (Ranunculus L.) and white clover (Trifolium repens L.) 1,2,3



  • Geology: The area is formed by the quartiary deposits of the Reuss glacier. It is dominated by moraines from the Würm ice age.
  • Soil type: Gleysol
  • Bulk density: between 1300 and 1400 kg m-3
  • Soil texture:



The site is divided into three adjacent parcels (Fig. 1). Management intensity as well as the timing of the management events varied between the parcels. A detailed table of management timing, type and intensity is given in the supplementary to this manuscript. In summary, the management of the more intensive parcels (P1 and P2 in Fig. 1) usually included two grazing periods, one in late spring and one in autumn, one or two harvests for hay or silage production during the main growing season and two to three fertilizer applications. The less intensively managed parcel (P3 in Fig. 1) was usually harvested or grazed as well as fertilized one time less per season. The fertilizer was mostly applied as solid manure within days after a harvest. The management timing and intensity also varied among years, depending on local weather conditions and vegetation growth.

Source: Rogger et al. (2022) 4



Detailed Management Info Download

Download: CH-FRU_Management_2005-2019 (XLSX) [Jun 2005 – Nov 2019] (file added 15 Jan 2022)

See also: Management (CH-FRU) (until 2015)





1 Imer, D., Merbold, L., Eugster, W., and Buchmann, N.: Temporal and spatial variations of soil CO2, CH4 and N2O fluxes at three differently managed grasslands, Biogeosciences, 10, 5931–5945, doi:10.5194/bg-10-5931-2013, 2013.
2 Sautier, S.: Zusammensetzung und Produktivität der Vegetation im Gebiet der ETHZ-Forschungsstation Frübül (ZG), MSc Thesis, university of Zürich: Institute of Geography, 2007.
3 Zeeman, M., Hiller, R., Gilgen, A., Michna, P., Plüss, P., Buchmann, N., and Eugster, W.: Management and climate impacts on net CO2 fluxes and carbon budgets of three grasslands along an elevational gradient in Switzerland, Agricultural and Forest Meteorology, 150, 519–530, doi:10.1016/j.agrformet.2010.01.011, 2010.
4 Rogger, J., Hörtnagl, L., Buchmann, N., & Eugster, W. (2022). Carbon dioxide fluxes of a mountain grassland: Drivers, anomalies and annual budgets. Agricultural and Forest Meteorology, 314, 108801. doi: 10.1016/j.agrformet.2021.108801


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