Hypolithic communities shape soils and organic matter reservoirs in the ice-free landscapes of East Antarctica
| Autor: | V. S. Soina, Alexander Dobryansky, Andrey Dolgikh, I. G. Shorkunov, Dmitry Fedorov-Davydov, Sergey Pryakhin, A. V. Yakushev, Elya Zazovskaya, N. S. Mergelov |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
010504 meteorology & atmospheric sciences Earth science lcsh:Medicine 01 natural sciences Article 03 medical and health sciences Organic matter lcsh:Science 0105 earth and related environmental sciences Total organic carbon chemistry.chemical_classification Rhizosphere Topsoil Multidisciplinary Ecology Soil organic matter lcsh:R Biological soil crust Biogeochemistry Environmental sciences 030104 developmental biology chemistry Soil water Environmental science lcsh:Q |
| Zdroj: | Scientific Reports Scientific Reports, Vol 10, Iss 1, Pp 1-19 (2020) |
| ISSN: | 2045-2322 |
| Popis: | The soils of East Antarctica have no rhizosphere with the bulk of organo-mineral interactions confined to the thin microbial and cryptogamic crusts that occur in open or cryptic niches and are collectively known as biological soil crust (BSC). Here we demonstrate that cryptic hypolithic varieties of BSC in the Larsemann Hills of East Antarctica contribute to the buildup of soil organic matter and produce several types of continuous organogenous horizons within the topsoil with documented clusters of at least 100 m2. Such hypolithic horizons accumulate 0.06–4.69% of organic carbon (TOC) with isotopic signatures (δ13Corg) within the range of −30.2 – −24.0‰, and contain from 0 to 0.38% total nitrogen (TN). The properties of hypolithic organic matter alternate between cyanobacteria- and moss-dominated horizons, which are linked to the meso- and microtopography patterns and moisture gradients. The major part of TOC that is stored in hypolithic horizons has modern or centenary 14C age, while the minor part is stabilized on a millennial timescale through shallow burial and association with minerals. Our findings suggest that hypolithic communities create a “gateway” for organic carbon to enter depauperate soils of the Larsemann Hills and contribute to the carbon reservoir of the topsoil at a landscape level. |
| Databáze: | OpenAIRE |
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