Cited by 20Soil Carbon and Nitrogen DynamicsSoil and Environmental StudiesSoil Geostatistics and Mapping

Impact of Climate on Soil Organic Matter Composition in Soils of Tropical Volcanic Regions Revealed by EGA-MS and Py-GC/MS

Lyu, Han, Zhong, Ruohan, Kilasara, Method, Hartono, Arief, Sun, Zheng, Funakawa, Shinya, Watanabe, Tetsuhiro·2024·Environmental Science & Technology

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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Crossref · 10.1021/acs.est.3c07000

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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
Venue
Environmental Science & Technology
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
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

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