Quantitative relationship between organic carbon and geochemical properties in tropical surface and subsurface soils

Ashida, Kaoru; Watanabe, Tetsuyou; Urayama, Shinnichi; Hartono, Arief; Kilasara, Method; Ze, Antoine David Mvondo; Nakao, Atsushi; Sugihara, Soh; Funakawa, Shinya

doi:10.1007/s10533-021-00813-8

Cited by 10 publications

(2 citation statements)

References 70 publications

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“…Subsoil had significantly lower degradation indices for saccharides and lipids (Table S5a), suggesting accumulation of microbial-derived OM. ,, In subsoil, these partially degraded compounds are likely tightly bound to soil minerals, limiting microbial access. , On the other hand, the lower immaturity index of SOM in subsoil (Figure S11d) indicates SOM is more microbially processed/degraded since the N-containing group represents microbial-derived SOM. , The higher ratio of PAH to total aromatics in subsoil (Table S5a) may result from lower C availability, whereby MAH could be used as a C source for subsoil microbes , and translocation of PAH from topsoil . Conversely, higher CPI and OEP in subsoil (Table S5a, Figure S11ac) may result from limited decomposition of recalcitrant root residues and/or the preferential stabilization of plant waxes by a less-saturated active Al/Fe fraction (Figure b). , …”

Section: Discussionmentioning

confidence: 99%

“…27 Conversely, higher CPI and OEP in subsoil (Table S5a, Figure S11ac) may result from limited decomposition of recalcitrant root residues and/or the preferential stabilization of plant waxes by a less-saturated active Al/Fe fraction (Figure 3b). 86,87 4.4. Factors Controlling SOM Composition and SOM Quality.…”

Section: Som Molecular Composition and Quality Insights 421 General C...mentioning

confidence: 99%

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

Lyu,

Zhong,

Kilasara

et al. 2024

Environ. Sci. Technol.

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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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Section: Discussionmentioning

confidence: 99%

Section: Som Molecular Composition and Quality Insights 421 General C...mentioning

confidence: 99%

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

Lyu,

Zhong,

Kilasara

et al. 2024

Environ. Sci. Technol.

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Climatic water availability modifies tree functional diversity effects on soil organic carbon storage in European forests

et al. 2023

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Modeling organic carbon bound in clay and silt particles in highly weathered lateritic soils of the Central Highlands of Vietnam

Hien

Hai²,

Thien³

et al. 2023

Model. Earth Syst. Environ.

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Quantitative relationship between organic carbon and geochemical properties in tropical surface and subsurface soils

Cited by 10 publications

References 70 publications

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

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

Climatic water availability modifies tree functional diversity effects on soil organic carbon storage in European forests

Modeling organic carbon bound in clay and silt particles in highly weathered lateritic soils of the Central Highlands of Vietnam

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