The mineralogical composition of calcium and calcium-magnesium carbonate pedofeatures of calcareous soils in the European prairie ecodivision in Hungary

Abstract

There is little data on the mineralogy of carbonate pedofeatures in the calcareous soils in Hungary which belong to the European prairie ecodivision. The aim of the present study is to enrich these data.The mineralogical composition of the carbonate pedofeatures from characteristic profiles of the calcareous soils in Hungary was studied by X-ray diffractometry, thermal analysis, SEM combined with microanalysis, and stable isotope determination.Regarding carbonate minerals only aragonite, calcite (+magnesian calcite) and dolomite (+proto -dolomite) were identified in carbonate grains, skeletons and pedofeatures.The values relating, respectively, to stable isotope compositions (C 13 , O 18 ) of carbonates in chernozems and in salt-affected soils were in the same range as those for recent soils (latter data reported earlier). There were no considerable differences between the values for the carbonate nodules and tubules from the same horizons, nor were there significant variations between the values of the same pedofeatures from different horizons (BC-C) of the same profile. Thus it can be assumed that there were no considerable changes in conditions of formation.Tendencies were recognized in the changes of (i) carbonate mineral associations, (ii) the MgCO 3 content of calcites, (iii) the corrected decomposition temperatures, and (iv) the activation energies of carbonate thermal decompositions among the various substance-regimes of soils.Differences were found in substance-regimes types of soils rather than in soil types.

Carbonate morphological features of vineyard soils in a semiarid Mediterranean environment

“…According to the literature, primary carbonate is inherited from a variety of soil parent materials, such as limestone, marls, Ca‐silicate minerals, and so forth, while secondary carbonate originates during soil formation (Gao et al, 2017; Leogrande et al, 2021; Sehgal & Stoops, 1972; Tandon & Narayan, 1981; West et al, 1988; Yousefifard et al, 2015). Barta (2011) and Szendrei et al (2012) stated that the morphology and genesis of pedogenic carbonate accumulations are key factors for solving many problems related to the genesis of soils of some worldwide regions.…”

Origins of hard carbonate nodules in arable Chernozems in the Central Russian Upland

“…The origin and morphology of pedogenic carbonate accumulations and their formation pathways are the key factors in solving many problems related to the genesis and changing of soils of arid regions worldwide under natural environmental fluctuations, and different approaches are used for that, including micromorphology and radiocarbon dating (Adamson, Candy, & Whitfield, 2015; Barta, 2011; Bayat, Karimi, & Khademi, 2017; Durand, Monger, & Canti, 2010; Khormali, Ghergherechi, Kehl, & Ayoubi, 2012; Kovda, Wilding, & Drees, 2003; Szendrei, Kovács‐Pálffy, Földvári, & Gál‐Sólymos, 2012). Much less attention is paid to the changing of pedogenic carbonates under the agricultural use of arid soils (Gong and Zhang, 2006; Chendev, 2008; Kuznetsova, Khokhlova, Chendev, & Aleksandrovskii, 2010; Chendev et al, 2011; Kovda et al, 2011).…”