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Substrate control of sulphur utilisation and microbial stoichiometry in soil: Results of C-13, N-15, C-14, and S-35 quad labelling

文献类型： 外文期刊

作者： Ma, Qingxu 1 ; Kuzyakov, Yakov 3 ; Pan, Wankun 1 ; Tang, Sheng 1 ; Chadwick, David R. 2 ; Wen, Yuan 2 ; Hill, Paul W.; 1 ;

作者机构： 1.Zhejiang Univ, Zhejiang Prov Key Lab Agr Resources & Environm, Key Lab Environm Remediat & Ecosyst Hlth, Minist Educ,Coll Environm & Resource Sci, Hangzhou, Peoples R China

2.Bangor Univ, Sch Nat Sci, Bangor, Gwynedd, Wales

3.Univ Gottingen, Dept Agr Soil Sci, Dept Soil Sci Temperate Ecosyst, Gottingen, Germany

4.RUDN Univ, Agrotechnol Inst, Moscow, Russia

5.Kazan Fed Univ, Inst Environm Sci, Kazan, Russia

6.Rothamsted Res, Sustainable Agr Sci Dept, Harpenden, Herts, England

7.Ningbo Univ, State Key Lab Managing Biot & Chem Threats Qual &, Key Lab Biotechnol Plant Protect, Minist Agr & Zhejiang Prov,Inst Plant Virol, Ningbo, Peoples R China

8.Zhejiang Acad Agr Sci, Inst Environm & Resource & Soil Fertilizer, Hangzhou, Peoples R China

9.Univ Western Australia, UWA Sch Agr & Environm, SoilsWest, Perth, WA, Australia

期刊名称：ISME JOURNAL （ 影响因子：9.18； 五年影响因子：10.712 ）

ISSN： 1751-7362

年卷期：

页码：

收录情况： SCI

摘要： Global plant sulphur (S) deficiency is increasing because of a reduction in sulphate-based fertiliser application combined with continuous S withdrawal during harvest. Here, we applied C-13, N-15, C-14, and S-35 quad labelling of the S-containing amino acids cysteine (Cys) and methionine (Met) to understand S cycling and microbial S transformations in the soil. The soil microorganisms absorbed the applied Cys and Met within minutes and released SO42- within hours. The SO42- was reutilised by the MB within days. The initial microbial utilisation and SO42- release were determined by amino acid structure. Met released 2.5-fold less SO42- than Cys. The microbial biomass retained comparatively more C and S from Met than Cys. The microorganisms decomposed Cys to pyruvate and H2S whereas they converted Met to alpha-ketobutyrate and S-CH3. The microbial stoichiometries of C, N, and S derived from Cys and Met were balanced after 4 d by Cys-derived SO42- uptake and Met-derived CO2 release. The microbial C:N:S ratio dynamics showed rapid C utilisation and loss, stable N levels, and S accumulation. Thus, short-term organic S utilisation by soil microorganisms is determined by amino acid structure whilst long-term organic S utilisation by soil microorganisms is determined by microbially controlled stoichiometry.

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