Search results for "Gypsiferous soil"
showing 3 items of 3 documents
Relief and calcium from gypsum as key factors for net inorganic carbon accumulation in soils of a semiarid Mediterranean environment
2021
Abstract In semiarid environments, the total inorganic carbon (TIC) in soil may contribute to the total carbon (C) pool more than the total organic C pool (TOC), thus playing a key role in storing atmospheric CO2. However, due to the different origin pathways of soil carbonates, not all of the TIC pool can be accounted for CO2 sequestration. Indeed, the inorganic C can be accounted for a net sink of CO2 only when calcium (Ca2+) forming carbonates originate from non-carbonate minerals (atmogenic inorganic C, AIC). The aim of this study carried out in a gypsiferous area is to investigate the dissolution of Ca2+ that comes from gypsum (CaSO4·2H2O) in the formation of soil atmogenic carbonates …
Pedogenic carbonates and carbon pools in gypsiferous soils of a semiarid Mediterranean environment in south Italy
2013
Abstract Soil carbonates are key features in soils of arid and semiarid environment, playing an important role from pedogenetic, landscape history, paleoclimatic and environmental points of view. The objectives of this work were (i) to study pathways of pedogenic carbonate (PC) formation, (ii) to distinguish between lithogenic and pedogenic inorganic C by using the natural C isotope abundance, and (iii) to estimate the soil C pools in a gypsiferous semiarid Mediterranean environment (Sicily, Italy). Five soil pedons developed on calcareous and non-calcareous parent materials from Holocene (10,000 years BP) to Upper Tortonian (7.2–5.3 Ma BP) in age were surveyed. During field soil descriptio…
Gypsum and Halite Deposition on Cyanobacteria and Algae in Salt‐Affected Soils.
2014
Soil surface communities are different from those of bulk soil due to the development of photo‐ synthetic communities comprising cyanobacteria, algae, and other bacteria which contribute to the formation of biological soil crusts. The structure of ecological niches forming biological crusts in saline soil environments is characterized by communities dominated by extremophiles organisms like archea, halophilic bacteria and cyanobacteria that can have a direct or indirect role in shaping soil properties. For example gypsum and halite were found by some authors as‐ sociated with the cyanobacterium Entophysalis (Braithwaite and Whitton, 1987); moreover the crystallization of gypsum and halite a…