Evaluacion de praderas usando indicadores ecologicos.
1992
Ramirez G Carlos | San Martin P Cristina | Finot S Victor | Rios L Darcy
An ecological evaluation and comparison of the following three prairie associations of South-Central, Chile: Hyperico-Agrostidetum, Juncetum procerii and Acaeno-Agrostidetum; the former on trumao soil, the second on trumao and nadi and the last on nadi and red loam soils was made. The floristic composition of these prairies was obtained through phytosociological sampling. For each censed species the ecological indicator value for the variables light, temperature, soil pH, nitrogen and humidity were used. The evaluations and comparisons were based on the species number and cover by using average and absolute values of ecological indicators and floristic similarity. The results confirmed that the use of ecological indicators makes possible the evaluation and comparisons of prairies biotypes. A correspondence between ecological and floristical similitude of the prairies was found. The highest floristic similitude was found between prairies on nadi soil. The Juncetum procerii on these soil and the Acaeno-Agrostidetum on the red loam soils were the floristically more isolated association. The last association and the Hyperico-Agrostidetum on trumao soil resulted to be the more xeric communities. The humidity and temperature are the factors which most differentiated the prairie vegetation of South-Central Chile; while the soil pH, showed practically no differences between them.
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