Iron mineral type controls organic matter stability and priming in paddy soil under anaerobic conditions

Shuang Wang; Wei Gao; Zhi Ma; Zhenke Zhu; Yu Luo; Liang Wei; Hongzhao Yuan; Song Chen; Chaoyun Ying; Kyle Mason-Jones; Yakov Kuzyakov; Tida Ge

doi:10.1016/j.soilbio.2024.109518

Iron mineral type controls organic matter stability and priming in paddy soil under anaerobic conditions

Shuang Wang, Wei Gao, Zhi Ma, Zhenke Zhu, Yu Luo, Liang Wei, Hongzhao Yuan, Song Chen, Chaoyun Ying, Kyle Mason-Jones, Yakov Kuzyakov, Tida Ge^* (Corresponding author)

^*Corresponding author for this work

NIOO - Terrestrial Ecology (TE)

Research output: Contribution to journal/periodical › Article › Scientific › peer-review

1 Citation (Scopus)

Abstract

Associations of iron (hydr)oxides (FeOx) with organic carbon are vital in regulating the stability of soil organic carbon (SOC). Like SOC, FeOx is chemically dynamic in soils, particularly under anaerobic conditions. However, previous research has not clarified how the stability of FeOx (goethite versus ferrihydrite) and the formation pathway of FeOx-OC associations (adsorption versus coprecipitation) affect the stability of FeOx-bound OC and, subsequently, the priming effect (PE) under anaerobic conditions. With an aim to bridge this gap, we incubated paddy soils for 80 d under anaerobic conditions after adding free ¹³C-glucose, ferrihydrite- or goethite-bound ¹³C-glucose formed by either adsorption or coprecipitation. Compared with the free glucose addition, the FeOx-bound glucose addition increased ¹³CO₂ production by 8%–21% but reduced ¹³C–CH₄ production by 7%–10%. Ferrihydrite-bound glucose was mineralised more than goethite-bound glucose; this is consistent with its lower crystallinity facilitating reduction and, thus, higher OC bioavailability. Glucose induced a negative priming effect (PE) for CO₂ but a positive PE for CH₄, whereas FeOx-bound glucose showed the opposite trend. This may be because FeOx-bound glucose provides an energy source and electron acceptor for Fe-reducing bacteria; this promotes the dissimilating reduction of iron and combines with an aggravated microbial P limitation resulting from the FeOx input. The crystallinity of FeOx affected the amount of primed CH₄ rather than its formation pathway. In conclusion, the crystallinity of FeOx controls the stability of FeOx-OC associations and the PE of SOC decomposition under anaerobic conditions.

Original language	English
Article number	109518
Journal	Soil Biology and Biochemistry
Volume	197
Early online date	14 Jul 2024
DOIs	https://doi.org/10.1016/j.soilbio.2024.109518
Publication status	Published - Oct 2024

Keywords

Carbon sequestration
Fe reduction
Iron-bound organic carbon
Methane
Mineral-associated organic matter
Priming effect

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Wang et al 2024
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@article{449f5e5104e64f40b5ffed0f80c2551b,

title = "Iron mineral type controls organic matter stability and priming in paddy soil under anaerobic conditions",

abstract = "Associations of iron (hydr)oxides (FeOx) with organic carbon are vital in regulating the stability of soil organic carbon (SOC). Like SOC, FeOx is chemically dynamic in soils, particularly under anaerobic conditions. However, previous research has not clarified how the stability of FeOx (goethite versus ferrihydrite) and the formation pathway of FeOx-OC associations (adsorption versus coprecipitation) affect the stability of FeOx-bound OC and, subsequently, the priming effect (PE) under anaerobic conditions. With an aim to bridge this gap, we incubated paddy soils for 80 d under anaerobic conditions after adding free 13C-glucose, ferrihydrite- or goethite-bound 13C-glucose formed by either adsorption or coprecipitation. Compared with the free glucose addition, the FeOx-bound glucose addition increased 13CO2 production by 8%–21% but reduced 13C–CH4 production by 7%–10%. Ferrihydrite-bound glucose was mineralised more than goethite-bound glucose; this is consistent with its lower crystallinity facilitating reduction and, thus, higher OC bioavailability. Glucose induced a negative priming effect (PE) for CO2 but a positive PE for CH4, whereas FeOx-bound glucose showed the opposite trend. This may be because FeOx-bound glucose provides an energy source and electron acceptor for Fe-reducing bacteria; this promotes the dissimilating reduction of iron and combines with an aggravated microbial P limitation resulting from the FeOx input. The crystallinity of FeOx affected the amount of primed CH4 rather than its formation pathway. In conclusion, the crystallinity of FeOx controls the stability of FeOx-OC associations and the PE of SOC decomposition under anaerobic conditions.",

keywords = "Carbon sequestration, Fe reduction, Iron-bound organic carbon, Methane, Mineral-associated organic matter, Priming effect",

author = "Shuang Wang and Wei Gao and Zhi Ma and Zhenke Zhu and Yu Luo and Liang Wei and Hongzhao Yuan and Song Chen and Chaoyun Ying and Kyle Mason-Jones and Yakov Kuzyakov and Tida Ge",

note = "Data archiving: no NIOO data",

year = "2024",

month = oct,

doi = "10.1016/j.soilbio.2024.109518",

language = "English",

volume = "197",

journal = "Soil Biology and Biochemistry",

issn = "0038-0717",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Iron mineral type controls organic matter stability and priming in paddy soil under anaerobic conditions

AU - Wang, Shuang

AU - Gao, Wei

AU - Ma, Zhi

AU - Zhu, Zhenke

AU - Luo, Yu

AU - Wei, Liang

AU - Yuan, Hongzhao

AU - Chen, Song

AU - Ying, Chaoyun

AU - Mason-Jones, Kyle

AU - Kuzyakov, Yakov

AU - Ge, Tida

N1 - Data archiving: no NIOO data

PY - 2024/10

Y1 - 2024/10

N2 - Associations of iron (hydr)oxides (FeOx) with organic carbon are vital in regulating the stability of soil organic carbon (SOC). Like SOC, FeOx is chemically dynamic in soils, particularly under anaerobic conditions. However, previous research has not clarified how the stability of FeOx (goethite versus ferrihydrite) and the formation pathway of FeOx-OC associations (adsorption versus coprecipitation) affect the stability of FeOx-bound OC and, subsequently, the priming effect (PE) under anaerobic conditions. With an aim to bridge this gap, we incubated paddy soils for 80 d under anaerobic conditions after adding free 13C-glucose, ferrihydrite- or goethite-bound 13C-glucose formed by either adsorption or coprecipitation. Compared with the free glucose addition, the FeOx-bound glucose addition increased 13CO2 production by 8%–21% but reduced 13C–CH4 production by 7%–10%. Ferrihydrite-bound glucose was mineralised more than goethite-bound glucose; this is consistent with its lower crystallinity facilitating reduction and, thus, higher OC bioavailability. Glucose induced a negative priming effect (PE) for CO2 but a positive PE for CH4, whereas FeOx-bound glucose showed the opposite trend. This may be because FeOx-bound glucose provides an energy source and electron acceptor for Fe-reducing bacteria; this promotes the dissimilating reduction of iron and combines with an aggravated microbial P limitation resulting from the FeOx input. The crystallinity of FeOx affected the amount of primed CH4 rather than its formation pathway. In conclusion, the crystallinity of FeOx controls the stability of FeOx-OC associations and the PE of SOC decomposition under anaerobic conditions.

AB - Associations of iron (hydr)oxides (FeOx) with organic carbon are vital in regulating the stability of soil organic carbon (SOC). Like SOC, FeOx is chemically dynamic in soils, particularly under anaerobic conditions. However, previous research has not clarified how the stability of FeOx (goethite versus ferrihydrite) and the formation pathway of FeOx-OC associations (adsorption versus coprecipitation) affect the stability of FeOx-bound OC and, subsequently, the priming effect (PE) under anaerobic conditions. With an aim to bridge this gap, we incubated paddy soils for 80 d under anaerobic conditions after adding free 13C-glucose, ferrihydrite- or goethite-bound 13C-glucose formed by either adsorption or coprecipitation. Compared with the free glucose addition, the FeOx-bound glucose addition increased 13CO2 production by 8%–21% but reduced 13C–CH4 production by 7%–10%. Ferrihydrite-bound glucose was mineralised more than goethite-bound glucose; this is consistent with its lower crystallinity facilitating reduction and, thus, higher OC bioavailability. Glucose induced a negative priming effect (PE) for CO2 but a positive PE for CH4, whereas FeOx-bound glucose showed the opposite trend. This may be because FeOx-bound glucose provides an energy source and electron acceptor for Fe-reducing bacteria; this promotes the dissimilating reduction of iron and combines with an aggravated microbial P limitation resulting from the FeOx input. The crystallinity of FeOx affected the amount of primed CH4 rather than its formation pathway. In conclusion, the crystallinity of FeOx controls the stability of FeOx-OC associations and the PE of SOC decomposition under anaerobic conditions.

KW - Carbon sequestration

KW - Fe reduction

KW - Iron-bound organic carbon

KW - Methane

KW - Mineral-associated organic matter

KW - Priming effect

U2 - 10.1016/j.soilbio.2024.109518

DO - 10.1016/j.soilbio.2024.109518

M3 - Article

AN - SCOPUS:85198350383

SN - 0038-0717

VL - 197

JO - Soil Biology and Biochemistry

JF - Soil Biology and Biochemistry

M1 - 109518

ER -