Abstract
ABSTRACT The soil of the mangroves influences the root anchorage and the nutrition processes of the plant community. This study evaluated the relationships among edaphic conditions, volume and biomass of roots, and tree structure of two mangroves in Paraná State. Five soil cores of 50 cm depth were collected from each mangrove for physicochemical analysis. Organosoil thiomorphic salic sodic predominated in Antonina Bay, while in Guaratuba Bay were observed the Gleysoil thiomorphic salic sodic and the Organosoil thiomorphic salic sodic. Fifteen root samples were collected from each mangrove area for root volume and dry mass analysis'?'. The higher values of root mass were found in Guaratuba Bay. The chemical analysis of the soil showed no correlation between biomass and root volume. The high coefficients of variation attested the high heterogeneity in the root distribution in both areas. However, in the Guaratuba Bay, root mass and volume are higher due to the textural composition of the soil and higher tree density.
Highlights
Mangroves are renowned for their biomass production, being one of the most productive ecosystems in the world (Tomlinson 1986)
The development of mangroves is associated with climatic, hydrologic and geomorphologic conditions, and tropical temperatures, tide amplitudes, presence of fresh water, and protected coastal areas are the basic prerequisites for the establishment and maintenance of mangrove ecosystems (Ferreira 2002)
This study evaluated the relationship between edaphic conditions and root biomass in the both mangrove areas to contribute with better understanding of relationships between soil and vegetation
Summary
Mangroves are renowned for their biomass production, being one of the most productive ecosystems in the world (Tomlinson 1986). Four genera of tree species are present in Brazilian mangroves: Rhizophora (Rhizophoraceae), Avicennia (Avicenniaceae), Laguncularia and Conocarpus (Combretaceae) These tree species are adapted to colonize and develop in unconsolidated soil and perform the main function of nutrient cycling since they are the primary source of organic matter (Amarasinghe & Balasubramannian 1992). Madi et al.: Soil and root biomass of mangroves 329 these differences were found related to the higher salinity of Guaratuba Bay and the higher organic matter content of Antonina Bay (Madi et al 2016) Based on this information, this study evaluated the relationship between edaphic conditions and root biomass in the both mangrove areas to contribute with better understanding of relationships between soil and vegetation
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