Contrasting response of organic carbon mineralisation to iron oxide addition under conditions of low and high microbial biomass in anoxic paddy soil
(2021) In Biology and Fertility of Soils 57(1). p.117-129- Abstract
- In contrast to what is observed in aerobic uplands, microbial biomass and the presence of electron acceptors, such as iron oxides, play a crucial role in regulating soil organic C (SOC) mineralisation in paddy soils. However, the related underlying mechanisms are still poorly explored. We conducted an anaerobic incubation study to investigate changes in CO2 emissions from SOC and acetate (13C-labeleld) in response to iron oxide (ferrihydrite and goethite) addition in chloroform-fumigated and unfumigated paddy soils. The iron oxides, as electron acceptors, increased CO2 emissions from SOC with stronger impact under ferrihydrite than goethite addition. However, the acetate addition, as a preferable C source for reducing microbes, decreased... (More)
- In contrast to what is observed in aerobic uplands, microbial biomass and the presence of electron acceptors, such as iron oxides, play a crucial role in regulating soil organic C (SOC) mineralisation in paddy soils. However, the related underlying mechanisms are still poorly explored. We conducted an anaerobic incubation study to investigate changes in CO2 emissions from SOC and acetate (13C-labeleld) in response to iron oxide (ferrihydrite and goethite) addition in chloroform-fumigated and unfumigated paddy soils. The iron oxides, as electron acceptors, increased CO2 emissions from SOC with stronger impact under ferrihydrite than goethite addition. However, the acetate addition, as a preferable C source for reducing microbes, decreased SOC mineralisation and caused a negative priming effect. CO2 emission from both acetate and SOC was affected by microbial biomass change. In the acetate-treated soil, goethite in the fumigated soil (i.e. high microbial biomass) increased CO2 emissions from acetate, providing electron acceptors, and decreased CO2 emissions from SOC. Ferrihydrite accepted electrons and adsorbed acetate, resulting in a slight decline in CO2 emission from acetate. However, in the fumigated soil (i.e. low microbial biomass), both iron oxide additions reduced CO2 emissions from acetate and SOC and likely the dominant role of both iron oxides shifted from being electron acceptors to being adsorbents, thus limiting acetate accessibility to microorganisms. The results suggest that microbial biomass is a key driver in shifting the effects of iron oxides on organic C mineralisation in anaerobic paddy soils. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/a75ef3a0-ac83-463b-90f0-bb33113baab9
- author
- Li, Yuhong ; Shahbaz, Muhammad LU ; Zhu, Zhenke ; Chen, Anlei ; Nannipieri, Paolo ; Li, Baozhen ; Deng, Yangwu ; Wu, Jinshui and Ge, Tida
- organization
- publishing date
- 2021
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Acetate, Anaerobic mineralisation, Iron oxides, Microbial biomass, Rice paddy soil, Soil organic C
- in
- Biology and Fertility of Soils
- volume
- 57
- issue
- 1
- pages
- 117 - 129
- publisher
- Springer
- external identifiers
-
- scopus:85091351702
- ISSN
- 1432-0789
- DOI
- 10.1007/s00374-020-01510-8
- language
- English
- LU publication?
- yes
- id
- a75ef3a0-ac83-463b-90f0-bb33113baab9
- date added to LUP
- 2020-09-24 11:45:12
- date last changed
- 2023-02-21 11:31:11
@article{a75ef3a0-ac83-463b-90f0-bb33113baab9,
abstract = {{In contrast to what is observed in aerobic uplands, microbial biomass and the presence of electron acceptors, such as iron oxides, play a crucial role in regulating soil organic C (SOC) mineralisation in paddy soils. However, the related underlying mechanisms are still poorly explored. We conducted an anaerobic incubation study to investigate changes in CO2 emissions from SOC and acetate (13C-labeleld) in response to iron oxide (ferrihydrite and goethite) addition in chloroform-fumigated and unfumigated paddy soils. The iron oxides, as electron acceptors, increased CO2 emissions from SOC with stronger impact under ferrihydrite than goethite addition. However, the acetate addition, as a preferable C source for reducing microbes, decreased SOC mineralisation and caused a negative priming effect. CO2 emission from both acetate and SOC was affected by microbial biomass change. In the acetate-treated soil, goethite in the fumigated soil (i.e. high microbial biomass) increased CO2 emissions from acetate, providing electron acceptors, and decreased CO2 emissions from SOC. Ferrihydrite accepted electrons and adsorbed acetate, resulting in a slight decline in CO2 emission from acetate. However, in the fumigated soil (i.e. low microbial biomass), both iron oxide additions reduced CO2 emissions from acetate and SOC and likely the dominant role of both iron oxides shifted from being electron acceptors to being adsorbents, thus limiting acetate accessibility to microorganisms. The results suggest that microbial biomass is a key driver in shifting the effects of iron oxides on organic C mineralisation in anaerobic paddy soils.}},
author = {{Li, Yuhong and Shahbaz, Muhammad and Zhu, Zhenke and Chen, Anlei and Nannipieri, Paolo and Li, Baozhen and Deng, Yangwu and Wu, Jinshui and Ge, Tida}},
issn = {{1432-0789}},
keywords = {{Acetate; Anaerobic mineralisation; Iron oxides; Microbial biomass; Rice paddy soil; Soil organic C}},
language = {{eng}},
number = {{1}},
pages = {{117--129}},
publisher = {{Springer}},
series = {{Biology and Fertility of Soils}},
title = {{Contrasting response of organic carbon mineralisation to iron oxide addition under conditions of low and high microbial biomass in anoxic paddy soil}},
url = {{http://dx.doi.org/10.1007/s00374-020-01510-8}},
doi = {{10.1007/s00374-020-01510-8}},
volume = {{57}},
year = {{2021}},
}