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

文献类型： 外文期刊

作者： Wang, Shuang 1 ; Gao, Wei 3 ; Ma, Zhi 1 ; Zhu, Zhenke 1 ; Luo, Yu 5 ; Wei, Liang 1 ; Yuan, Hongzhao 3 ; Chen, Song 6 ; Ying, Chaoyun 7 ; Mason-Jones, Kyle 9 ; Kuzyakov, Yakov 10 ; Ge, Tida 1 ;

作者机构： 1.Ningbo Univ, Inst Plant Virol, State Key Lab Managing Biot & Chem Threats Qual &, Ningbo 315211, Peoples R China

2.Ningbo Univ, Inst Plant Virol, Key Lab Biotechnol Plant Protect MARA & Zhejiang P, Ningbo 315211, Peoples R China

3.Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China

4.Chinese Acad Sci, Inst Subtrop Agr, Changsha Res Stn Agr & Environm Monitoring, Changsha 410125, Hunan, Peoples R China

5.Zhejiang Univ, Coll Environm & Resource Sci, Zhejiang Prov Key Lab Agr Resources & Environm, Hangzhou 310058, Peoples R China

6.Chinese Acad Agr Sci, China Natl Rice Res Inst, Hangzhou 310006, Zhejiang, Peoples R China

7.Ningbo Univ, Zhejiang Collaborat Innovat Ctr, Dept Geog & Spatial Informat Tech, Ningbo 315211, Peoples R China

8.Ningbo Univ, Ningbo Univ Collaborat Innovat Ctr Land & Marine S, Ningbo 315211, Peoples R China

9.Netherlands Inst Ecol NIOO KNAW, Dept Terr Ecol, Wageningen, Netherlands

10.Univ Goettingen, Dept Soil Sci Temperate Ecosyst, Dept Agr Soil Sci, Busgenweg 2, D-37077 Gottingen, Germany

11.Peoples Friendship Univ Russia RUDN Univ, Moscow 117198, Russia

关键词： Carbon sequestration; Fe reduction; Mineral-associated organic matter; Iron-bound organic carbon; Priming effect; Methane

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：9.8； 五年影响因子：10.4 ）

ISSN： 0038-0717

年卷期： 2024 年 197 卷

页码：

收录情况： SCI

摘要： 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 13 C-glucose, ferrihydrite- or goethite-bound 13 C-glucose formed by either adsorption or coprecipitation. Compared with the free glucose addition, the FeOx-bound glucose addition increased 13 CO 2 production by 8% -21% but reduced 13 C -CH 4 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 CO 2 but a positive PE for CH 4 , 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 CH 4 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.

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