COMMUNITY ANALYSIS OF CHENOPODIACEAE FAMILY IN SAN LUIS, ARGENTINA.

GÓMEZ MONTENEGRO BRENDA; VIDELA ANDREA; MOGLIA MARTA MATILDE

Ciuda de San Luis

Congreso; XXXVII Reunión Científica Anual Sociedad de Biología de Cuyo; 2019

Sociedad de Biología de Cuyo

The members of Chenopodiaceae are important components of the flora and vegetation of the arid regions of the world. The family includes nearly 100 genera and 1400 species. A great number of the halophytes and xerohalophytes of the world belongs to this family. Chenopodiaceae family in San Luis province includes a great variety of species, some of them natives, poorly studied, and others being considered as agricultural plagues, and cause of polinosis in humans and animals. The majority of the non native species are invaders, being characteristics of disturbed sites. In these places members of this family conform vegetal communities that associate them. The purpose of this work was to study the communities dominated by this family in San Luis city and nearby. The methodology included prospecting study areas in order to identify the study zones: center, suburbs, river and salinity sites next to Salinas del Bebedero. A total of 32 phytosociological inventories were made, according to methology of Zurich-Montpellier school. It was registered a total of 71 species, 19 of them being Chenopodiaceae. The most characteristic communities in San Luis city were the quinoa species, being dominated by Chenopodium album and Chenopodium hircinum, and communities of white quinoa dominated by Chenopodium borbassi. In the suburban areas, especially in marginal lands as border areas close to roads, were prevalent the ?cardales? community dominated by Salsola kali. The river zone was dominated by Dysphania ambrosoides. In salinized areas were registered communities of Chenopodiaceae dominated by: Sarcocornia neei, Heterostachys ritteriana, Allenrolfea vaginata and Atriplex lampa, following a salinity/humidity gradient. It was concluded that in the study area the Chenopodiaceae community are highly frequent in disturbed areas and/or with salinity. Their distribution and phenology must be under consideration in relation to control their expansion, and allergy problems caused by pollen. On the other side, potential uses as tolerant species in degraded lands should be under considerationas source of biomass for areas under disturbances.