The ecological indicator values of the South-Central Chilean weeds
1991
Ramirez G, Carlos | Finot S, Victor | San Martin P, Cristina | Ellies S, Achim (Universidad Austral de Chile, Valdivia (Chile). Inst. de Botanica)
The site requirements of the 256 frequent weeds of South-Central Chile were studied, using indicator values for light, temperature, soil reaction, nitrogen and moisture. Also the phytogeographical origin, life form, phytosociological affinity and salt tolerance of all of them were investigated. Hemicryptophytes and therophytes dominated in the biological spectrum. The former growing in fresh and humid soils, the latter, in dryer conditions. A plant list indicators for light, shadow, high and low temperature, soil acidification, richness and scarcity of nutrients, salinity, eutrophication, fire, humidity, dryness and soil compactness are given and analized in detail. The use of these bioindicators species for the evaluation of agricultural biotops and for determinating site conditions is discussed. They are also useful for a better ecological control of the weeds. The results are summarized in a table that can be used for consultation and to know the ecological requirements of the weeds of South-Central Chile, and in order to evaluate agricultural and pasture soils. In this Table, indicator values for all the species and factors are given. Finally, the behaviour in relation to each factor of native plants as compared with the introduced ones, is analized
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