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Contrasting respons...
Contrasting response of organic carbon mineralisation to iron oxide addition under conditions of low and high microbial biomass in anoxic paddy soil
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- Li, Yuhong (författare)
- Chinese Academy of Sciences
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- Shahbaz, Muhammad (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Centre for Environmental and Climate Science (CEC),Faculty of Science,Institutionen för mark och miljö,Department of Soil and Environment
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- Zhu, Zhenke (författare)
- Chinese Academy of Sciences
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- Chen, Anlei (författare)
- Chinese Academy of Sciences
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- Nannipieri, Paolo (författare)
- University of Florence
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- Li, Baozhen (författare)
- Chinese Academy of Sciences
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- Deng, Yangwu (författare)
- Jiangxi University of Science and Technology
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- Wu, Jinshui (författare)
- University of the Chinese Academy of Sciences
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- Ge, Tida (författare)
- Ningbo University,Chinese Academy of Sciences
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(creator_code:org_t)
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- 2020-09-23
- 2021
- Engelska.
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Ingår i: Biology and Fertility of Soils. - : Springer Science and Business Media LLC. - 1432-0789 .- 0178-2762. ; 57:1, s. 117-129
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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https://res.slu.se/i...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- Acetate
- Anaerobic mineralisation
- Iron oxides
- Microbial biomass
- Rice paddy soil
- Soil organic C
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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