Past and present bacterial communities in deglaciating northern latitude catchments reveal varied soil carbon sequestration potential.

• Tác giả: Saule Akhmetkaliyeva, Leon J Clarke, Simon J Cook, Andrew P Dean, Sharon Ruiz Lopez, Robert B Sparkes
• Ngôn ngữ: eng
• Ký hiệu phân loại: 978.02 1800–1899
• Thông tin xuất bản: Netherlands : The Science of the total environment , 2025
• Bộ sưu tập: NCBI
• ID: 722591

Tóm tắt

 Glacier retreat in northern latitudes exposes new landscapes that may develop soils and ecosystems, which in turn may sequester carbon and serve as a negative climate change feedback. Proglacial soil development and landscape evolution were investigated using transects from three high-latitude glacial systems (Tarfala, Sweden
  Vatnajökull, Iceland
  Zackenberg, Greenland). Soil samples were analysed for organic carbon (OC) concentration, bacteriohopanepolyol biomarkers (BHPs, membrane lipids that trace major microbial groups), and 16S rRNA gene sequencing. Soil and sediment samples from Sweden showed lower OC concentrations (0.27 ± 0.26 wt%) than deposits from Iceland (1.59 ± 2.12 wt%) and Greenland (1.62 ± 1.54 wt%). Highest OC concentrations were from moraines exposed for several millennia, while recently deglaciated areas in Sweden and Iceland had the lowest OC values. Higher fractional abundance of soil-specific BHPs down-valley (up to 30 % in Greenland), and matching increases in the R'