Das Langzeitgedächtnis der Vegetation: Neue Resultate aus der Versuchsweide von 1930 bis 2004 auf der Schynigen Platte (2000 müM)

Hegg, Otto (2005). Das Langzeitgedächtnis der Vegetation: Neue Resultate aus der Versuchsweide von 1930 bis 2004 auf der Schynigen Platte (2000 müM). Berichte der Reinhold-Tüxen-Gesellschaft, 17, pp. 41-54. Reinhold-Tüxen-Gesellschaft

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In 1930, the first experiment on fertilization of alpine vegetation, the second in the world, was started. Dr. Werner Lüdi tried to get better fodder for cattle from the Geo montani-Nardetum, a vegetation type growing on extremely poor and acid soil, by fertilizing with N, P, K and ground limestone and their mixtures. He reached his goal with N, P, lime, manure and Thomas slag and published the results (LÜDI 1959). Fortunately his notes are preserved, so that on the basis new research is possible.
Since 1980 our goal of research is the influence of fertilizers on biodiversity: Which species are furthered by which fertilizer, which are checked, how does the changed competition work? The pasture contains species being very susceptible on fertilization or changes in management. On some examples such reactions are shown: Arnica montana disappears with almost all fertilizers. Carlina acaulis shows an amazing constancy in quadrates where it once made it to grow.
Typical species of the stronger fertilized Crepido-Festucetum rubrae are almost 70 years after the last fertilization still more frequent than in unfertilized plots. The pH of the soil in the surfaces treated with lime is after almost 70 years still higher than in untreated plots.
Leaves of 7 species collected in fertilized quadrates contain almost 60 years later more N, P and Ca than leaves from untreated ones. The last relevées from 2002 demonstrate for the first time the probable influence of fertilization from the air with N and with dust containing P and other nutrients including lime. Many questions still are open and could to be answered by using this material.

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