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Environmental Earth Sciences

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01.11.2021 | Original Article

Stable and radiogenic strontium isotope cycling in a representative karst forest ecosystem, Southwest China

verfasst von: Guilin Han, Anton Eisenhauer

Erschienen in: Environmental Earth Sciences | Ausgabe 22/2021

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Abstract

Nutrient depletion in the ecosystem mainly occurred via the base cations leach from the ecosystems. Isotope technology can provide new information on the nutrients’ behavior (cycle) in ecosystems. To better understand the strontium (Sr) biogeochemical cycle in the forest, radiogenic and stable Sr isotopes were determined in various environmental samples (rainwater, groundwater, calcareous soil, vegetation, and bedrocks) collected from a karst forest ecosystem, Southwest China. The Sr supplies are supported via the deposition of atmospheric materials and the weathering of carbonate rock in this area. These supplied sources observably influence the Sr isotope compositions (both stable and radiogenic isotope). Across the ecosystem, the varied ranges of ⁸⁷Sr/⁸⁶Sr ratios increased in the order: bedrock (0.708) ~ groundwater (0.708–0.709) ~ rainwater (0.709–0.711) ~ vegetation (0.709–0.710) < surface calcareous soil (0.713–0.719) < deep calcareous soil (0.714–0.724). Both rainwater and groundwater present similar ⁸⁷Sr/⁸⁶Sr ratios to the water-draining carbonate-dominated terrain. The ⁸⁷Sr/⁸⁶Sr ratios of vegetation are similar to that of rainwater but slightly heavier than groundwater. In contrast, the varied ranges of δ^88/86Sr values followed a sequence of rainwater (0.08–0.21‰) < groundwater (0.11–0.27‰) < deep calcareous soil (0.02–0.29‰) < tree leaves (0.12–0.17‰) < surface calcareous soil (0.14–0.29‰) < bedrock (0.40‰) < shrub leaves (0.50‰). The δ^88/86Sr values of tree leaves are between surface calcareous soil and deep calcareous soil, and the δ^88/86Sr values of shrub leaves are higher than all of the compartments in the forest ecosystem, which indicated vegetation uptake might control the stable strontium fractionation. In combination with the radiogenic and stable Sr isotopes, our investigation presents that the ⁸⁷Sr/⁸⁶Sr provides sources’ information, whereas the δ^88/86Sr records biogeochemical cycle information.

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Titel: Stable and radiogenic strontium isotope cycling in a representative karst forest ecosystem, Southwest China
verfasst von: Guilin Han
Anton Eisenhauer
Publikationsdatum: 01.11.2021
Verlag: Springer Berlin Heidelberg
Erschienen in: Environmental Earth Sciences / Ausgabe 22/2021
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-021-10075-0

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