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Contributions of fine mineral particles and active Al/Fe to stabilization of plant material in neutral-to-alkaline soils of Indo-Gangetic Plain

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Relation http://oar.icrisat.org/12276/
https://www.sciencedirect.com/science/article/pii/S0016706123003865?via%3Dihub
https://doi.org/10.1016/j.geoderma.2023.116709
 
Title Contributions of fine mineral particles and active Al/Fe to stabilization of plant material in neutral-to-alkaline soils of Indo-Gangetic Plain
 
Creator Zhong, R
Lyu, H
Kumari, M
Mishra, A K
Jat, M L
Dahlgren, R A
Funakawa, S
Watanabe, T
 
Subject Soil Fertility
Soil
 
Description Factors controlling organic carbon stabilization are elusive in neutral-to-alkaline soils, thereby hindering the
assessment of carbon sequestration potential across vast agricultural regions like the Indo-Gangetic Plain (IGP).
This study investigated controls over mineralization and stabilization of added organic matter in tropical neutralto-
alkaline soils with low organic carbon (SOC). Using topsoil and subsoil samples from 12 sites of upper-tolower
IGP, we conducted a one-year incubation with and without adding 13C-labeled maize material. We
tracked CO2 release and residual C remaining in soil organic matter fractions (free, occluded particulate (oPOM),
and mineral-associated organic matter (MAOM)) and analyzed organic matter molecular compositions in incubated
soils using pyrolysis-GC/MS. Our results revealed that 48 ± 7 % of added maize C was mineralized, mostly
within the first 70 days. Higher active Al/Fe, notably Al, retarded primary maize mineralization by facilitating
aggregation. High SOC content and SOC saturation degree resulted in more maize mineralization. The disappearance
of maize-unique compounds (e.g., neophytadiene) revealed substantial degradation of added maize.
Regarding SOC composition, maize addition increased the relative abundance of fatty acids and decreased that of
N-containing compounds. Most residual maize-derived C was found in stabilized fractions, MAOM (77 ± 15 % of
residual maize C) and oPOM (8 ± 4 %). Clay fraction contributed to most maize-derived C stabilization as MAOM
(path coefficient (β) = 0.81**). Moreover, the significant correlation (P < 0.001) between maize-derived oPOM C
and active Al/Fe or clay + silt suggested that active Al/Fe contributed to the stabilization of maize-derived C as
oPOM (β = 0.62***) probably by bonding clay and silt particles to form stable aggregates since active Al/Fe
content was low (
 
Publisher Elsevier
 
Date 2023-11-07
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights cc_by_nc
 
Identifier http://oar.icrisat.org/12276/1/Geoderma_440_1-13_2023.pdf
Zhong, R and Lyu, H and Kumari, M and Mishra, A K and Jat, M L and Dahlgren, R A and Funakawa, S and Watanabe, T (2023) Contributions of fine mineral particles and active Al/Fe to stabilization of plant material in neutral-to-alkaline soils of Indo-Gangetic Plain. Geoderma, 440. pp. 1-13. ISSN 0016-7061