Barroso F. R. G., Gomes V. D., Carvalho C. E., Ledru Marie-Pierre, Favier C., Araujo F. S., Bremond L. (2021). Phytoliths from soil surfaces and water reservoirs of the Brazilian semi-arid Caatinga. Journal of South American Earth Sciences, 108, 103180 [8 p.]. ISSN 0895-9811.
Titre du document
Phytoliths from soil surfaces and water reservoirs of the Brazilian semi-arid Caatinga
Année de publication
2021
Auteurs
Barroso F. R. G., Gomes V. D., Carvalho C. E., Ledru Marie-Pierre, Favier C., Araujo F. S., Bremond L.
Source
Journal of South American Earth Sciences, 2021,
108, 103180 [8 p.] ISSN 0895-9811
Understanding processes that explain phytolith assemblages and their concentration in the soil and sediments is essential to interpret long-term ecological changes. The present study shows modern phytolith assemblages and their relationship with the vegetation cover in the Caatinga biome, state of Cear ' a, northeastern Brazil. We collected recent samples from soil surfaces, in 2015, in three different vegetation covers (open shrubby Caatinga, dense shrubby Caatinga, and Caatinga forest vegetation) and from two cores with recently deposited sediments, in Massape (74 cm depth, 55 years old) and Varjota (50 cm depth, 58 years old). After phytolith extraction, we studied twelve samples from soils and thirteen samples from cores. The counting revealed 26 different phytolith types with some differences in the concentration of silica bodies in different vegetation covers. Phytoliths were well preserved and could be related to the presence of plants, such as Poaceae (subfamily Panicoideae and Chloridoideae), Arecaceae and Cyperaceae. In the two cores, the most common type was globular echinate and could be associated with the presence of palms in the riparian forest and open landscapes in the surroundings. In soil surfaces samples, the saddle was the most frequent type. We found a high concentration of globular granulate around Aiuaba Ecological Station, which harbors a preserved Caatinga area. Finally, we observed a good match between vegetation cover and the phytolith assemblages collected in soils and reservoirs.
Plan de classement
Géologie et formations superficielles [064]
;
Etudes, transformation, conservation du milieu naturel [082]
Description Géographique
BRESIL ; ZONE SEMIARIDE ; ZONE TROPICALE ; CEARA
Localisation
Fonds IRD [F B010082225]
Identifiant IRD
fdi:010082225
