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Maize and soybean experience fierce competition from soil microorganisms for the uptake of organic and inorganic nitrogen and sulphur: A pot test using C-13, N-15, C-14, and S-35 labelling

文献类型： 外文期刊

作者： Ma, Qingxu 1 ; Pan, Wankun 1 ; Tang, Sheng 1 ; Sun, Xiaodan 2 ; Xie, Yinan 1 ; Chadwick, David R. 2 ; Hill, Paul W. 2 ; S 1 ;

作者机构： 1.Zhejiang Univ, Coll Environm & Resource Sci, Zhejiang Prov Key Lab Agr Resources & Environm, Hangzhou 310058, Peoples R China

2.Bangor Univ, Sch Nat Sci, Bangor LL57 2UW, Gwynedd, Wales

3.Zhejiang Acad Agr Sci, Inst Environm & Resource & Soil Fertilizer, Hangzhou 310021, Peoples R China

4.Zhejiang Univ, Coll Environm & Resource Sci, Minist Educ, Key Lab Environm Remediat & Ecosyst Hlth, Hangzhou 310058, Peoples R China

5.Univ Western Australia, UWA Sch Agr & Environm, SoilsWest, Perth, WA 6009, Australia

关键词： maize And soybean intercropping; Methionine and cysteine; Organic nitrogen and sulphur; Soil microorganisms

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：5.795； 五年影响因子：6.767 ）

ISSN： 0038-0717

年卷期： 2021 年 157 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) and sulphur (S) are essential nutrients for plant growth. A pot experiment was conducted to verify whether maize and soybean under monoculture and intercropping could utilise N- and S-containing amino acids when competing with soil microorganisms. Maize and soybean were able to utilise methionine (Met; 1.9-2.2% of total addition) and cysteine (Cys; 0.6-1.6% of total addition) as N and S sources, however they faced competition with soil microorganisms. Six hours after microbial uptake, 45.3-64.0% of the S from Met was retained in the microbial biomass, while there was much lower retention from Cys (16.8-34.5%), and 32.5-44.1% of the S from Cys and 15.6-33.3% of that from Met was transformed to SO42-. Cys was a superior S source for plants compared to Met, as higher SO42- release from Cys could support plant growth. Both maize and soybean plants took up NH4+ (98-99% of total N uptake) and SO42- (85-90%) as their main N and S sources from soil. The N from Cys and Met accounted for only similar to 1% of total N uptake from soil, and organic Cys and Met accounted for only similar to 0.2% of the total N uptake, indicating that these two amino acids have limited effects on plant N nutrition, due to the high inorganic N content in agricultural soil. However, the Cys and Met contribution (i.e., organic S uptake and mineral S uptake originating from Cys and Met) to total S uptake (10-15%) was an order of magnitude higher than their N contributions, suggesting that Cys and Met play an important role in soil S nutrition. Intercropping altered the uptake but not the preference for N and S forms in maize and soybean. Overall, the results suggest that S-containing amino acids are important S sources for plant growth even at a lower concentration in soil, but that they play a limited role in plant N nutrition due to a larger inorganic N pool in agricultural soil.

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