Szekunder karbonátok mennyisége és vertikális eloszlása tokaji talajszelvényekben

Novák, Tibor József and Csámer, Árpád and Incze, József and Papp, István and Rózsa, Péter (2016) Szekunder karbonátok mennyisége és vertikális eloszlása tokaji talajszelvényekben. Agrokémia és Talajtan, 65 (2). pp. 193-206. ISSN 0002-1873


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The forms and stocks of secondary carbonate accumulations and the distribution of secondary carbonate content were investigated in 20 soil profiles from Nagy-hegy, Tokaj. The secondary carbonate content varied to a great extent under different lithological conditions. The frequency of carbonate crusts coating the coarse fragments to a thickness of 1–7 mm was especially conspicuous. In selected profiles the amount of secondary carbonates was analysed separately for three carbonate pools: in the fine earth (<2 mm), in carbonate crusts and other concentrations, and in the skeletal part of the soils (dominantly dacite blocks and boulders). In one profile a calculation was made of the calcium carbonate stocks (in kg m<sup>−2</sup>) in the separate fractions of the fine earth, the skeletal fraction and the carbonate crusts and concentrations. The values obtained for the distinct soil horizons were then summed for the whole profile above the continuous hard rock. The loess deposits can be regarded as the primary source of calcium carbonate, but many types of secondary carbonate accumulations occurred in places where the loess deposits were completely eroded or the original surface of the soil was only preserved on terraces with retaining walls. The results suggest that the highest accumulation of calcium carbonate occurs in profiles where loess, redeposited loess or colluvial deposit covers weathered volcanic rocks (pyroxene dacite), resulting in lithological discontinuity. The carbonate crusts consisted of 55–96 % (m/m) CaCO<sub>3</sub>, and the coarse fraction (dacite boulders and blocks) also had a higher calcium carbonate content (5–10 % m/m) than the non-weathered pyroxene dacite. The calcium carbonate stocks in Calcic accumulation horizons proved to be 2.5 times higher than in the overlying soil horizons. The accumulation forms of carbonates in the soil profiles and the lack of loess deposits on the top of the soil profiles suggest that the calcium carbonate was accumulated in the transitional zone between the loess and the weathered volcanic rocks. This appears to have taken place under humid climatic conditions, unlike the recent climate, and can thus be regarded at least partially as the result of paleoecological processes.

Item Type: Article
Subjects: S Agriculture / mezőgazdaság > S1 Agriculture (General) / mezőgazdaság általában > S590 Soill / Talajtan
Depositing User: Ágnes Sallai
Date Deposited: 19 Mar 2020 08:24
Last Modified: 19 Mar 2020 08:24

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