Impact of Climate on Soil Organic Matter Composition in Soils of Tropical Volcanic Regions Revealed by EGA-MS and Py-GC/MS
Abstract
Soil organic matter (SOM) crucially influences the global carbon cycle, yet its molecular composition and determinants are understudied, especially for tropical volcanic regions. We investigated how SOM compounds change in response to climate, vegetation, soil horizon, and soil properties and the relationship between SOM composition and microbial decomposability in Tanzanian and Indonesian volcanic regions. We collected topsoil (0–15 cm) and subsoil (20–40 cm) horizons ( n = 22; pH: 4.6–7.6; SOC: 10–152 g kg –1 ) with undisturbed vegetation and wide mean annual temperature and moisture ranges (14–26 °C; 800–3300 mm) across four elevational transects (340–2210 m asl.). Evolved gas analysis-mass spectrometry (EGA-MS) documented a simultaneous release of SOM compounds and clay mineral dehydroxylation. Subsequently applying double-shot pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) at 200 and 550 °C, we detailed the molecular composition of topsoil and subsoil SOM. A minor portion (2.7 ± 1.9%) of compounds desorbed at 200 °C, limiting its efficacy for investigating overall SOM characteristics. Pyrolyzed SOM closely aligns with the intermediate decomposable SOM pool, with most pyrolysates (550 °C) originating from this pool. Pyrolysates composition suggests tropical SOM is mainly microbial-derived and subsoil contains more degraded compounds. Higher litter inputs and attenuated SOM decomposition due to cooler temperatures and lower soil pH (<5.5) produce less-degraded SOM at higher elevations. Redundancy analyses revealed the crucial role of active Al/Fe (oxalate-extractable Al/Fe), abundant in low-temperature/high-moisture conditions, in stabilizing these less-degraded components. Our findings provide new insights into SOM molecular composition and its determinants, critical for understanding the carbon cycle in tropical ecosystems.
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These environmental variations likely explain the trends observed, although further studies are needed to isolate and characterize these metabolites to better understand the mechanisms driving their production.
“These environmental variations likely explain the trends observed, although further studies are needed to isolate and characterize these metabolites to better understand the mechanisms driving their production [59].”
From Comparative Analysis of Infusions and Ethanolic Extracts of Annona muricata Leaves from Colima, Mexico: Phytochemical Profile and Antioxidant Activity (2024) · cites this paper as [59]
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- Authors
- Lyu, H., Zhong, R., Kilasara, M., Hartono, A., Sun, Z., Funakawa, S., & Watanabe, T.
- Affiliations
- Kyoto University (JP)
- Sokoine University of Agriculture (TZ)
- IPB University (ID)
- Centre National de la Recherche Scientifique (FR)
- Corresponding author
- Lyu, Han
- ORCID
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2024-05-17
- Volume
- 58
- Issue
- 22
- Pages
- 9646-9657
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W4397022889
- Cited by
- 20
- References
- 90
- Citations by year
- 2026: 10 · 2025: 9 · 2024: 1
- FWCI
- 4.42
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Japan Society for the Promotion of Science (17H06171, 19J14696, 20H04322, 23H03524)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil and Environmental Studies
- Physical Sciences › Environmental Science › Environmental Engineering › Soil Geostatistics and Mapping
- Keywords
- soil organic matter composition, soil organic carbon, soil depth, elevation gradient, soil pH, soil organic matter decomposition, litter input, soil carbon stabilization, carbon cycle, volcanic areas
- MeSH terms
- Gas Chromatography-Mass Spectrometry, Soil, Tropical Climate
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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