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2nd International Congress of Alpine and Arctic Botanical Gardens

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His intention was to make the Nardetum, a very<br />

poor pasture on acid soil, more productive <strong>and</strong><br />

with better fodder. He treated 340 squares <strong>of</strong> 1m 2<br />

in many different ways, especially with different<br />

fertilizers. O. Hegg got the results <strong>and</strong> the data <strong>of</strong><br />

this experiment in 1975. Later on, he changed the<br />

goals <strong>of</strong> the research. He laid the main interest in<br />

species diversity <strong>and</strong> long lasting influences <strong>of</strong><br />

fertilization (Hegg 1984, 1992). There are various<br />

young scientists gathering new results from this<br />

experiment now. One important result for species<br />

conservation: Any fertilization is bad for<br />

species <strong>of</strong> nutrient-poor vegetation, <strong>and</strong> its effect<br />

lasts for a very long time. In 2006 we can still see<br />

differences in species composition <strong>and</strong> in ecological<br />

measurements for an impact made in 1936,<br />

after 70 years (Spiegelberger et al. 2006)!<br />

Both, the alpine garden <strong>and</strong> the experimental<br />

field, are <strong>of</strong> a very high ecological value today,<br />

even more in future. Both show the long-term effects<br />

<strong>of</strong> human influence on alpine vegetation.<br />

Short look at the garden (see www.alpengarten.ch)Today,<br />

visitors can enter the garden directly<br />

beside the railway station <strong>and</strong> walk on 420<br />

m <strong>of</strong> main paths <strong>and</strong> ca. 500 m <strong>of</strong> smaller ones.<br />

They do not have to climb on many peaks; they<br />

can walk on comfortable paths to find 600 species<br />

that means two thirds <strong>of</strong> Swiss alpine plants,<br />

Sum <strong>of</strong> Species-cover per Group<br />

25<br />

20<br />

15<br />

10<br />

5<br />

0<br />

Seslerio-<br />

Caricetum<br />

Crepido-<br />

Festucetum<br />

most in their natural association or planted very<br />

close to these conditions.<br />

The Garden lies in an altitude <strong>of</strong> 1975 m <strong>and</strong><br />

measures about 8500 m2. The whole garden was used as a pasture until<br />

1928. The greatest part shows natural vegetation<br />

in about 20 phytosociological associations. Four<br />

are very frequent <strong>and</strong> important: The blue grassmeadow,<br />

the meadow <strong>of</strong> rusty sedge, the alpine<br />

pasture <strong>and</strong> the mat-grass meadow (Seslerio-Caricetum<br />

sempervirentis, Caricetum ferrugineae,<br />

Crepido-Festucetum rubrae, Geo montani-Nardetum).<br />

The other associations are present in<br />

small parts in the garden, but most <strong>of</strong> them in<br />

quite typical examples.<br />

For species foreign to Schynige Platte, it was tried<br />

from the beginning to develop artificial associations<br />

(Lüdi 1957). Compared to the plant sociological<br />

garden <strong>of</strong> Tüxen in Hannover (Tüxen<br />

1940), it is much more difficult to establish artificial<br />

associations in an alpine environment,<br />

mainly because <strong>of</strong> the topography which changes<br />

much more on very short distances.<br />

Already in 1928 the construction <strong>of</strong> the “Urgesteinsfeld”<br />

(part with granitic soil) was started, for<br />

all plants from the central Alps with their soils<br />

poor in Calcium.<br />

All these artificial associations give the possibility<br />

to show many plants from other parts <strong>of</strong> the<br />

1928 1939 1997 2008<br />

Seslerion Caricetum<br />

ferrugineae<br />

Fig. 1. A slope with species belonging to 3 different phytosociologiocal units on limestone was inventoried by W. Lüdi in 1928<br />

<strong>and</strong> by O. & V. Hegg in 2008. We see for the sum <strong>of</strong> cover in % for these species groups a decline <strong>of</strong> the species from dryer<br />

vegetation types (Crepido-Festucetum, Seslerio-Caricetum sempervirentis ) <strong>and</strong> a progress <strong>of</strong> species <strong>of</strong> Caricetum ferrugineae,<br />

an association <strong>of</strong> more humid conditions. This is a tendency in the whole garden: to more humid relations, more humus<br />

production, more shadow on the soil. We called this the “ferruginization”, i. e. increase <strong>of</strong> species <strong>of</strong> the Caricetum ferrugineae.<br />

Horticultural Practices 17

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