Effects of pyrophosphate-extractable aluminum, iron, and calcium on organic carbon storage in buried humic horizons of a cumulative volcanic soil profile containing charred plant fragments, Miyakonojo, Miyazaki, Japan

Charred plant fragments (CPFs), having two primary types (carboxylic and phenolic functional groups) of metal-binding sites, are widely distributed in Japanese volcanic soils containing black humic acids. However, the effects of metal components on the storage of CPFs are still unknown. The aim of t...

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Bibliographic Details
Published in:Soil science and plant nutrition (Tokyo) 2024-11, Vol.70 (5-6), p.387-392
Main Authors: Shindo, Haruo, Inoue, Yudzuru
Format: Article
Language:English
Subjects:
Accumulation
Acidic soils
Aluminum
Andisols
Andosols
Binding sites
black humic acids
Calcium
Carbon sequestration
Correlation coefficient
Correlation coefficients
Fragments
Functional groups
Humic acids
Iron
Metals
Organic carbon
Organic soils
organo-metal interactions
Phenols
Plant extracts
reactive Al, Fe, and Ca
Soil analysis
Soil profiles
Soil properties
Volcanic soils
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Summary:Charred plant fragments (CPFs), having two primary types (carboxylic and phenolic functional groups) of metal-binding sites, are widely distributed in Japanese volcanic soils containing black humic acids. However, the effects of metal components on the storage of CPFs are still unknown. The aim of this study was to determine the direct and indirect effects of metal components on the CPF-carbon (CPF-C) and soil organic C (SOC) contents in four buried humic horizons (2A-5A, from 7.3 cal ka BP to AD 1471) of a cumulative volcanic soil profile (Miyakonojo, Miyazaki, Japan), employing correlation, and path analyses. Nineteen soil samples were collected from the humic horizons described above and used. Pyrophosphate-extractable aluminum (Al py ), iron (Fe py ), and calcium (Ca py ), which are common in the soils, were selected as reactive metal components. The CPF-C content accounted for up to 15.1% of the SOC content (8.4% on average). The Al py content was highest in all soils, mostly followed by the Fe py and then Ca py contents. No consistent trends with soil age/depth were found for the accumulation levels of CPF-C, SOC, and metal components. However, there were significant correlations (p 
ISSN:0038-0768
1747-0765
DOI:10.1080/00380768.2024.2389603