Dataset Information

Groundwater of the Crimean peninsula: a first systematic study using stable isotopes.

ABSTRACT: Karst springs in the Main Range of the Crimean Mountains and the Crimean Piedmont show a restricted range of values (?¹⁸O?=?-10.5 to -8.0 ‰, ?²H?=?-72 to -58 ‰), somewhat more negative than the weighted mean of meteoric precipitation. This suggests preferential recharge at higher elevations during winter months. Groundwater tapped by boreholes splits in three groups. A first group has isotopic properties similar to those of the springs. The second group shows significantly lower values (?¹⁸O?=?-13.3 to -12.0 ‰, ?²H?=?-95 to -82 ‰), suggesting recharge during colder Pleistocene times. The third group has high isotope values (?¹⁸O?=?-2.5 to +1.0 ‰, ?²H?=?-24 to -22 ‰); the data points are shifted to the right of the Local Meteoric Water Line, suggesting water-rock exchange processes in the aquifer. These boreholes are located in the Crimean Plains and discharge mineralized (ca. 25 g L^-1) thermal (65°C) water from a depth of 1600-1800 m. Groundwater associated with mud volcanoes on the Kerch peninsula have distinct isotope characteristics (?¹⁸O?=?-1.6 to +9.4 ‰, ?²H?=?-30 to -18 ‰). Restricted ?²H variability along with variable and high ?¹⁸O values suggest water-rock interactions at temperatures exceeding 95 °C.

SUBMITTER: Dublyansky YV

PROVIDER: S-EPMC6816486 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Groundwater of the Crimean peninsula: a first systematic study using stable isotopes.

Dublyansky Yuri V YV Klimchouk Alexander B AB Tokarev Sergey V SV Amelichev Gennady N GN Spötl Christoph C

Isotopes in environmental and health studies 20190816 5

Karst springs in the Main Range of the Crimean Mountains and the Crimean Piedmont show a restricted range of values (δ<sup>18</sup>O = -10.5 to -8.0 ‰, δ<sup>2</sup>H = -72 to -58 ‰), somewhat more negative than the weighted mean of meteoric precipitation. This suggests preferential recharge at higher elevations during winter months. Groundwater tapped by boreholes splits in three groups. A first group has isotopic properties similar to those of the springs. The second group shows significantly ...[more]

PMID: 31416351

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Project description:Rendzic Leptosols are intrazonal soils formed on limestone bedrock. The specialty of these soils is that parent rock material is more influential in shaping soil characteristics than zonal factors such as climate, especially during soil formation. Unlike fast evolving Podzols due to their leaching regime, Leptosols do not undergo rapid development due to the nature of the limestone. Little is known how microbiome reflects this process, so we assessed microbiome composition of Rendzic Leptosols of different ages, arising from disruption and subsequent reclamation. The mountains and foothills that cover much of the Crimean Peninsula are ideal for this type of study, as the soils were formed on limestone and have been subjected to anthropogenic impacts through much of human history. Microbiomes of four soil sites forming a chronosequence, including different soil horizons, were studied using sequencing of 16S rRNA gene libraries and quantitative PCR. Dominant phyla for all soil sites were Actinobacteria, Proteobacteria, Acidobacteria, Bacteroidetes, Thaumarchaeota, Planctomycetes, Verrucomicrobia and Firmicutes. Alpha diversity was similar across sites and tended to be higher in topsoil. Beta diversity showed that microbiomes diverged according to the soil site and the soil horizon. The oldest and the youngest soils had the most similar microbiomes, which could have been caused by their geographic proximity. Oligotrophic bacteria from Chitinophagaceae, Blastocatellaceae and Rubrobacteriaceae dominated the microbiome of these soils. The microbiome of 700-year old soil was the most diverse. This soil was from the only study location with topsoil formed by plant litter, which provided additional nutrients and could have been the driving force of this differentiation. Consistent with this assumption, this soil was abundant in copiotrophic bacteria from Proteobacteria and Actinobacteria phyla. The microbiome of 50-year old Leptosol was more similar to the microbiome of benchmark soil than the microbiome of 700-year old soil, especially by weighted metrics. CCA analysis, in combination with PERMANOVA, linked differences in microbiomes to the joint change of all soil chemical parameters between soil horizons. Local factors, such as parent material and plant litter, more strongly influenced the microbiome composition in Rendzic Leptosols than soil age.

Dataset Information

Groundwater of the Crimean peninsula: a first systematic study using stable isotopes.

Publications

Groundwater of the Crimean peninsula: a first systematic study using stable isotopes.

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